L695speed

You will get a million answers, and its because there are a million ways to do it. Acceleration is traction limited. A friend of mine is having problems putting the power down with 477 at the crank and a 3.42 rear with a Turbo 350 trans. If that HO engine is setup right it will run pretty respectable. I've heard of them pulling on the later TBI and TPI motors. Is your car an auto or a stick? The 5 speed car is good for an easy 7 sec to 60 maybe with a lil tuning it can break into the 6s and 14 quarters. For a new driver, that may be fast enough for the time being, especially if you've never driven truly fast cars. Trust me, having driven an LS1 ZO6 vette that has had some work done to it, if you don't know how to handle the power, it can bite you. My dad took me out in the snow and taught me the basics of car control with a full size bronco and the 4x4 turned off. Those lessons served me well when I drove my own Trans Am and that Vette.

However, if you are not a new driver, by all means have at it. Assuming budget is not an issue and you want bolt in power (least amount of work) I would go get a 425 horse or so turn key crate motor. Based on my own experiences with a 2002 Trans Am and seeing my friend with the 477 horse motor run, not to mention the vette, that will be more than enough power to fulfill your expectations. However, keep in mind, more power means you will need to upgrade in other areas, particularly tires, and brakes. The Turbo on the HO motor will work but, with boost you may blow the bottom of the stock motor if it has high mileage on it. And I'm not sure how much of an increase over stock it will be.

ryan85TA305

Thanks for this info. Exactly what I've been looking for. My engine is coming together now, and during the summer I hope to get a trans. and get everything swapped in.

KrisW

iTrader: (5)

I sure hope you get it done and into a daily driver state. Its on my list, but way down there hahahah!

Formula_Fire

For anyone still following this thread though my engine is coming along as well. I picked up a 350 pontiac block rebuilt .030 over and just got a set of 6H heads which are the high output 6X-4 style heads for the 350 block with bigger valves (2.11 intake, 1.66 exhaust). Next on my shopping list is a cam and some gaskets and I can put it together. Still kicking around the idea of 2 small twin turbos for it as well like 6 to 8 PSI max those heads only have a 7.6:1 C.R. so I think it would be a idea combo with two small turbos. I think I could do the whole setup pretty cheap if I pieced it together myself.

astre421

iTrader: (1)

Formula Fire- Just an FYI; but do the heads you speak of aquiring actually have a "6H" cast just above the center 2 exhaust ports? If so, be careful. While I never say "never" when it comes to our Pontiac parts and castings, most (99.9%) of the 6H castings I've seen are the 124cc '76 455 head, which obviously on a 350 would allow it to run well on Auto Zone starting fluid. If you end up cc'ing them let me know what you come up with, always interested to hear about any Pontiac oddities. Good luck with the project, Ryan

Formula_Fire

Yes they are 1975 6H 350 HO heads according to the date codes. From what I have been able to gather they are basically the same as the lower cc 6x-4 heads and in 75 they were only available on the 350 HO. Should leave me with a 7.6 Compression Rating unless I mill them or stroke the engine. (which I am not planing on doing).

This is going to be a street car with a mild cam and possibly a low PSI twin turbo setup in the future. So the 7.6cr is about perfect for a turbo application. I'm not going crazy on power I just want something a little different and also a little upgrade from the low output 305 chevy with 107,000 miles that is currently taking up space in my engine bay.

The way I look at it my car is a base with the LG4 that makes 155hp@4200 and 245ft-lbs@2400 (on a good day). Stock specs on the 350 are 175HP@4000 and 280ft-lbs@2000 (which its well known pontiac under rated their engines back then). My understanding with these and all mid 70's pontiacs is they had them so detuned that replacing the crap smog cam, adding headers, a free flow exhaust and carb upgrade is good for anywhere from 75~100 hp and tq. which would leave me with a respectable 250+ HP @ 350+ tq all for under $800 including all parts. Add a small twin turbo setup later on and I will have a solid pump gas 350hp / 425+tq engine that is dead reliable and very unique.

astre421

iTrader: (1)

Not trying to sound like "that guy", but there were no 350 HO's manufactured by Pontiac in the '70s. Sure, there were 350s from '75-'77 with 4 barrels and big intake valve heads with screw in studs, but the last real 350 HO was the '69 version with the Ram Air III's #48 heads and 068 cam.

Of course it's possible that you have a set of small-ish 91-94 cc chamber heads with 6H cast on them. I still own a 350 block with a model year "75" cast by the distributor hole, with a mid-February '76 casting date, with a '74 only block code stamped on the front pad. I think the factory and foundry guys either got complacent or just wanted to have some fun.

All I'm saying is if you do have the 455 heads I suspect, you're either going to need a custom domed piston (for a Pontiac 350? $$$$$) or a LOT of angle milling to the heads and 0 decking the block to get anywhere near 7.6:1 compression. Best to cc the heads to be sure.

I do understand wanting to keep the compression down. Scroll about 1/3 way down this page http://www.pontiacpower.com/LatestDyno.htm to see a 350 that is currently waiting another home (car I originally put it in developed frame rust issues) Do let me know what you come up with, I enjoy hearing about odd ball Pontiac stuff.

Formula_Fire

The only mention of a 350 in that article was a rebuild 400 using 4C 350 heads that I could find btw.

Hmm the whole reason I bought the 6H was there was a tech article and a few web sites listing them as factory 350 HO heads with a 7.6cr with the better flowing 2.11 1.66 valves and a 200hp net...

Wallace racing lists the 6H with a casting code of 6 on the valve cover boss as you are correct a 114~124cc (there is some conflicting info all over on that apparently they varied a bit). But if you scroll down to the 1975 model in wallace's head listing their again is listed a 1975 350 HO right below the regular 455 with 6H heads and 7.6cr which appears on a bunch of sites dedicated to these engines.

http://www.pontiacracing.net/head.htm

Odd thing is they also list a CR graph that shows at 114cc the CR of a 350 Pontiac (actually 354cid) would only be 6.3cr...
http://wallaceracing.com/cratio0001.htm

The more I look at this the more it looks like they have all been using the same flawed head chart and coping it over and over. The 6H looks like it was for the 455 HO and is indeed 124cc. Which would leave me with about a 5.8cr....maybe if I ran about 30lbs of boost and methanol?

Well crap if that is the case it was total waste of money buying those 6h heads!

I do still have the stock 1972 7H1 heads for my engine which are the smaller 1.94/1.66 valves, 7.6cr with unhardened seats for leaded gas. That's the whole reason I was trying to get a later heads, to get a little bigger valves and the hardened seats. The heads have a 3 angle valve job on them and the 350 was over bored .030. It was run with premium in a 81 grand prix with a big cam, in that setup it was able to pull 12.9's at the track. The guy I got it from swapped to a 455 with 6x-4 heads to do some more serious racing.

I'd like a higher compression but I have a sneaking feeling with the 7H1's that would cause detonation with the unhardened seats... So I guess I'm screwed until I can find some 6X-4's and a power adder.

Marks57

New here to the forum. I like the look of the 3rd Gen base Firebirds 1986 on. I have a '73 400 in my garage built with large valve 62 heads and the late sixties PS & altenator mounts; I think these mounts sit lower than the seveties set up and might be a good match to the 3rd gen. I have a nice stock 4bbl manifold for the engine.
I have read alot of this thread but not all and have some ideas. I think I would keep the 700R4 and use an adapter plate because it looks pretty expensive to refit a turbo or 200R4 to the torque arm. Late 2nd gen frame mounts with custom brackets similar to Ames FN621B's.

Formula_Fire

Sounds like a good plan of attack take some pics and keep us posted.

kagtech

All is not lost with those heads here is a comparison test done by High Performance Pontiac for 70's heads aka Smog Heads. The 6H head was also used on the 350 as well.

http://www.highperformancepontiac.co...e/viewall.html

I run #16's on my Pontiac 400 and have a set of 6x-4's (milled about .040 yields about 86cc) for my 350 as that motor will go in my 3rd gen backed by a M20 close ratio.

Marks57

Thanks, here are a few pix of the 400 to start..if I did the image attach right!

Formula_Fire

Yes but even in that article the 6H heads are the worst in every category.

dragincar209

I have an '84 Firebird that I built sometime back for drag racing. It has a Ford 9 inch rear end with 4.11 gears and a spool, hung in with a set of Competition Engineering (CE) ladder bars along with a CE weld in sub frame kit. I also have a CE 8 point cage that I will be installing this winter.
Right now it has a stock bore 350 Chevy and a TH400 with a 10 in converter. Currently I'm getting only about low 13 sec 1/4 mile times with a 12.88 & a few 12.93's being the quickest.
I have acquired a '71 Pontiac 400 which I am planing to build. I'm either going to stroke it to a 435 cid or a 462 cid, I haven't decided yet.
My question is about motor mounts & headers! Does anyone make these yet to swap a Pontiac into a 3rd Gen Firebird and make it a REAL Pontiac? Most posts that I have read are fairly old so I'm wondering if there is some new info out there. I would appreciate any suggestions or info that someone might have.

Formula_Fire

No one makes them anymore. There is a little debate on wither or not stock mounts will work. It really depends on the intake. The pontiac mounts will bolt right into the chevy frame mounts but if your using a aftermarket intake or taller air cleaner or carb you will need a cowl hood to clear it. It would be pretty simple to fab up mounts or just modify ours for clearance though. There was a company making mounts that sat the engine lower but they closed up. Another member had a set (very simple setup) and was gonna get the dimensions for us to make some... but he disappeared as well. As far as headers no company currently make conversion headers... however looking at 2nd gen f-body shorty headers I "think" those would work and dump the collectors in the right spots. That's just a theory though based on looking at the stock log manifolds (which we know work) and and the shorties (not universal shorties but the ones designed for 2nd gens) side by side they appear to be in the right spots. I was gonna get a cheap hedman set and try this but now I am thinking of doing a small twin turbo app so that's gonna need a custom setup anyway.

dragincar209

Thanks for the info. I'm not too concerned with the hood clearance as I already have cut a hole in the hood for the K&N Velocity Stack, I'm more worried about the driveline angle that would result from the raised position of the engine. I guess my brother & I will have to fab them up, we had talked about doing that! As for the headers, I have 2 sets, one 4 tube & one 3 tube, both are long tube style, I kind of figured that we are gonna have to modify them too. But I was hoping. Thanks!

Formula_Fire

I don't think there is a issue several guys here have used pontiac blocks with no mods to the mounts. I know with my 305 the stock cleaner is REALLY close to the hood I think the only time there is a issue is with aftermarket intakes that sit higher the 2nd gens have the same issue with the performer RPM or anything higher intake too.

krazefbird

Like the way the 400 looks, just found one yesterday so am now planning on going that way. Like the idea way more than just throwin in another 383 like everything else....

ramairta

First time posting here, but I am doing this swap as well. Using a freshened 74 400 with Headman shorty Pontiac headers. My best friend originally aquired all the parts, then decided to go LS swap. Had to do some modification to the stock K-member to clear the headers, but everything fits nice. Oil filter clears lower a frame mount, and with the right air cleaner a stock hood will clear it with a Performer intake on it. Will post some pics and soon as I get some taken

Formula_Fire

Yes please post some pics, did you mean with the 400 the headers did not clear or the LS? and did he use firebird specific shorty headers or generic shorties? Could you make sure to post some good pictures of the firewall too I am worried about havc unit clearance. If its easier I could give you my email if there is to much to post here. Thanks!

KrisW

iTrader: (5)

Also, its best to start your own thread so that everything gets documented properly, but reply here and post the link to that thread so that everyone cruising this general area can go to your specific page.

Don't forget LOTS of pictures! Especially modified k-member and motor mount setup, valve cover clearance, and stuff like that.

tajoe

iTrader: (1)

Wow! A 10 year member, and 1st time posting. What made you take the plunge? Hope your project goes well. Can't wait for the pics.

Street Lethal

iTrader: (16)

You didn't see this yet? Brighten the monitor if you can to better see the firewall...

tajoe

iTrader: (1)

Nice looking job! Something to be proud of.

ransam

iTrader: (2)

He means with the 400 and shorty headders wouldnt fit so he notched and plated the k member for clearance. What needs cut will depend where you place the motor. He made his own mounts also. I will get some pics next time i am over there.

Formula_Fire

Cool please do and find out if he used generic or 2nd gen shorties, big difference in design.

Marks Tempest 4

New member here. But I'm looking at swapping in a Tempest 4 cylinder in a 3rd Gen. Many of you may not know this but Pontiac made a special 4 cylinder for 3 years. It is a recast 389 block, but only half of a block.



It uses all the old 389 Pontiac parts, rods, pistons, special 180 degree cast crank (very tough cast crank), one head and much more. This is a pic of a mock up with a damaged (long story) tunnel ram that I will be cutting in half to use. I just have not cut it in half yet. I have a friend in NY that built one with a turbo and he has already hit over 700 HP at 25 pounds.





This thread is (has been) very informative for me. I would really like to find a nice GTA and drop this 4 cylinder into it. My only problem is, I'm building a 1963 Pontiac Catalina Gasser with a fully built '60 389 (now 406) with twin turbos.



I'm almost done but I can't pull the trigger on the 3rd Gen until the '63 is done, or near done. One nice thing is, I'm down here in Phoenix and you can find really nice (rust free) cars in good physical shape with trashed motors for decent prices.
I just wanted to bring this back up to thank everyone for their input and hope that all of you will continue with updates so we can see how it all comes out for everyone.

Mark L

tajoe

iTrader: (1)

Wow! You are very inventive Mark. I hear ya about finishing 1 project B4 starting another.I've been cursed with that for yrs, and can't seem to finish anything. Gasser is really cool. Good luck with the 3rd gen.

Marks Tempest 4

Hello Joe. Thanks for the kind words. I've been surfin' the local Craigslist with the hope that I can fall into a good deal. I get impatient when I get an idea so I have to just cool it and wait. As soon as the temps cool to human levels down here, I have lots to do on the Catalina. So that will keep me busy. I think Pontiac originally intended the full size Pontiac motor to be placed in the '82 chassis so I think that's why it's almost a natural fit. But life, government, and Politics got in the way and the Pontiac engine lost out. So I feel it's up to us to make the wrong right again, LOL. (You can tell I'm a Pontiac nut with that statement). I see in your info that you have an '84 and a turbo 301. Is that a marriage?? Do you have that all together and running/using? I'm a 301 lover so that is another build I would love to do. There are several people playing with the 301 now where it used to be "black death" to even think about them. Anywho. Nice talking at you and we'll see where I go with this 4 cylinder. I just thought, with the great looks of the 3rd Gens, and the sheer bulk and strength inherent in the old Pontiac 4 cylinder, it would make real head turner.

Mark L

tajoe

iTrader: (1)

Hey Mark. Sounds like you've got your priorities in order. No need to rush into the 3rd gen. There's one out there, with your name on it, and you'll know it when you meet it. Seems like you're having a good time right now, and that's what it's all about.
I too have been a Pontiac fan/freak for almost 40 yrs, owning a few Goats, birds, and T/As, and my next project is the 84 with the 301T, for the reasons most "loyal" Pontiac fans will agree on. Unfortunately twin teenage girls, and all of lifes "distractions" have put a serious damper on my progress. I've been collecting parts, and this site has been helpful, but moving at a snails pace.I'm not sure if I've updated my photo galley with my 84 stuff, but I'll see to it later. If you're on photobucket, you'll be able to see it. The name there is the same as it is here.
Well Mark, Sat. now, and my "to-do" list is calling. Enjoy your nice dry climate out there. Our humidity will be up around 70 something% for the next few days. Later. Joe

Marks Tempest 4

So you're like me, a long time Pontiac sufferer, LOL. I've been a Pontiac fan since my first one in 1969. I've fallen of out of the Pontiac world here and there. Built Chevies. Big block Builks, owned a new '91 5.0 5 speed LX Mustang--but I always come back to a Pontiac. Previous to my Catalina I had a '73 Trans Am. Originally a custom painted show car, then turned daily driver by the owner just before me. I bought it completely (and I mean completely) disassembled for a restoration that never got past the disassembly stage. After getting it home in 100 boxes and taking two years to reassemble and upgrade it, I built the 455, eventually turbocharging it and It dynoed at 1065 Flywheel HP (886.6 at the rear wheels). But a gentleman from Delaware became interested in the car and phoned me one day just after I retired and moved down here to Phoenix. He literally made me an offer I could not refuse. So it went to Delaware. I found my '63 (one of my favorite big Pontiacs) and combining that with my love of Gassers, this is where I am now. The '63 was a nice body with wasted interior and a frame. Perfect canvas for what I wanted to do.
But now (even though I'm not done with the '63) I would like to build a street driver that has big power but derived from an unusual situation. My preference is a Black on black 3rd Gen Formula 305 5 speed or a GTA with that same equipment if it was ever available in a GTA. And basically drop the turbocharged 4 cylinder in place of the Chevy motor. I'll upgrade everything afterwards as needed. I've owned 3 2nd gen early year cars and love 'em but I think the 3rd Gen would work better with what I want to do and look more modern doing it. Such is my Goal.
It was nice getting to know you a little better Joe. Sounds like you and I are cut from the same cloth. Good talking at ya.
Mark L

Marks Tempest 4

Just a quick update. I cut the tunnel ram in half. This is what I will do when I build the 4 cylinder. I'll add bungs for injectors, plate off the open half of the tunnel ram and add twin side draft (?) throttle bodies.





Does look a little lopsided but it should make nice HP numbers with it and still be under the stock hood. I love turbos but the thought of hanging a 3.8 GTP/SSEi blower, or a larger Mustang/Lightening blower off the side of the block and blowing it thru an intercooler then up to that plenum, really makes me smile. Just thought I'd throw this on.

Mark L

tajoe

iTrader: (1)

Well, if all pans out Mark, you either have a 2nd 4 cyl. tunnel ram to sell, or have another one to remodify to a different configuration. Nice to have the options.

Marks Tempest 4

One and the same mind Joe. Planned to cut it and offer it up to all the Pontiac 4 cylinder guys. But no one wants it. So, time to get really inventive on the use of the extra side. Thought about cutting the plenum off at the top of the runners, add aluminum tubing like the end of a header (4 into 1), adding a flange for a throttle body and using that for an N/A intake entrance. Could look pretty cool with spaghetti tubing all over the place, HA! (Always thinking/imagining).

Mark L

Marks Tempest 4

Update on the 4 cylinder build. I found a very nice M90 3 Gen blower at a local swap. For $100 it is in perfect working order. It looks very little used or possibly rebuilt but I think more the little used. It's off a 3800 GP or Bonneville (or buick).



I've been doing some research, asked a lot of questions, and I think I've got a handle all of the normal modifications to make them flow better and more efficiently. So I'll be doing all of that to get the most out of the blower. So, as I work in my other project, I'll keep banging away on this one to get as close to building it as possible.
Gotta dream and gotta have fun.

Formula_Fire

I know its been awhile but I wanted to post a little update for the V8 guys here astre421 was right, the 6H heads were the 124cc suck *** heads I actually did a lot more research to figure that out and even contacted butler performance about it.

That said I managed to score a set of 6X-4 small chamber heads. Looking at a few online compression ratio calculators with my block specs and the heads and overbore should leave me at about a 8.56:1 with 93cc chambers (there is a variance of anywhere from 92 to 94cc guys have found). I figure with a mild cam I should make some decent power and later on if I want to do the turbo setup the compression ratio should support a mild one.

I've thought about having them milled .28 which is about the max I can do with out having to mill the intake and deck according to a few builders I have reached out to. That will make them -4cc to 89cc will get me around my ideal 8.9:1 cr. Not sure if its really worth the hassle for .4cr.

I also scored a brand new in the box edelbrock performer intake for dirt cheap.

I moved and bought a house this spring and the new garage has no power and is so small that I only have an inch clearance on the bumpers with the door closed. So progress has been slow to say the least....
On the bright side I did get her home from hibernation at the inlaws which was a 2 hour drive away and got the formula 16" rims mounted before the deep freeze hit around here.




Yes that is the garage behind her... I am planing to expand it a bit this spring and finish collecting the parts I need for the engine swap so hopefully some decent progress after 5 years of planning

Formula_Fire

Hey mark if you do a look around on youtube there is a guy out there with two of those on his pontiac V8.

EDIT: Found it, not sure if he ever got it functional it barely idled in the vid.

Marks Tempest 4

Now who's crazy, LOL. That looks like twin 3.8 Ford Super Coupe (Thunderbird) blowers. I like that. The two should add a good pressure at idle to overcome any poor flow at low rpm and still have enough flow thru the mid range and top end to really make that 4 cylinder breath. I would really like to see or read more about the engine. To see if he has done anything as far as head work or if the engine has been built, etc.. It did idle hard but I think it was more of a cold start problem than the blowers fault. Although. He was blowing them thru a carb. If he has not built the carb for blow thru, especially idle and off idle blower pressure, it may be affecting the response. But I see it more as a cold start problem.
Thanks for putting that up there for me. I really appreciate the thought.

OPPS! Just looked real close at the video (large screen) and I see it is a full V8 Pontiac motor. I thought when I was listening to it that it sounded awfully smooth, LOL. Still a neat set up for as fum car. It's in a Vega too so it's probably front end heavy but light over all. Now I would really like to know more about the car.

Mark

Formula_Fire

Yep full V8 Pontiac with M90 3.8 GM superchargers. You can score those all day long in good shape for around 100~200. All the supercharged pontiacs and buicks used them. For you Mark I would say just do one they are tuned for a 3.8L and you can get smaller pullies to up the boost a bit if u want.

Marks Tempest 4

Those are Ford spec units with top inlets. The GM is a rear inlet. But I think the flow specs are the same. You can see my GM unit at #435 above. Unfortunately, the 4 cylinder is on the back burner until I get my current '63 Catalina build done. You can see a pic of the '63 on page 427 but since that pic was taken I've completely revised engine compartment. I've got it all done as far as piping, intercooler, and turbo placements. I'm now working on getting all of the water lines run for the intercoolers and the radiator/heat exchanger I picked up. This the new engine compartment configuration.





This is the new little Mini radiator I found on E-Bay for $65 with a 12 inch elec. fan. I have to add aluminum bungs to it to run all the water lines but it fits nicer and the top tank sets above the intercooler water line and eliminates a separate recovery tank for the water. Kind of looks a little bit more old school as well, versus the longer lower heat exchanger I was going to use.



Mark

Formula_Fire

Ah right you are sir I completely missed that being the supercoupe charger... Really bad considering my daily driver is a 94 T-bird so I'm a bit familiar with the super coupe crowd... that and you just posted a M90 in the previous post. I guess that's what I get for posting at 4am with no sleep lol

But either version I think would work good on that "little" 4Cyl. Question is how are you gonna get fuel to it? I guess it wouldn't be too hard to weld in injector bungs but then you gotta get a computers and all that fun stuff. You know it occurs to me with the 3.8 style top had you could probably run a carb off the top of it.... they are a lot harder to find though.

PS Nice race car man. I gotta ask whats with the gutted shotgun air cleaner? Is that just for mock up I would think that would make a pretty expensive intake hat and hard to seal Vs a aftermarket carb hat to each carb. made for boost.

Marks Tempest 4

If I ever get to actually build it I'll go EFI. It's just so much more "boost" friendly compared to any blow thru system. If I had the money I would be going EFI on the Catalina too. But CSU really knows their stuff so I know I'm OK with the carbs on the 406. I would add bungs to the "half" tunnel ram and if you look at the cut up plenum, it gives me all kinds of opportunities to mount throttle bodies. I can close it u with top inlets (hood clearance problems), or side draft throttle bodies for more clearance, or close it up and make a front throttle body inlet. Lots of possibilities.
I have several thoughts on the intake configuration with the 4 cylinder but I won't do anything until I can concentrate on it. From a single M90, to a possible 6-71, to a turbo, to a twin charge system using the M90 with a turbo chaser. Lots of possibilities and lots of configurations to address lots of different scenarios. The 4 cylinder will need a big flowing head to accomplish my HP goals. In a 2 valve configuration, that head is going to make the 4 cylinder really soft down low. The blower could be used to crutch up the low end but then it will not flow enough for the top end. The turbo would be a monster in the mid range and top end but again it would be a dog down low, and probably be like a light switch when the boost did come up. I want to look hard at the factory twin turbo set up off of the twin turbo Supras. I think it could work well. Or the M90 with the turbo blowing thru it. The M90 on it's own will never flow enough for what I want for the top end. But if you chase the flow thru the M90 with a turbo, it will increase the efficiency of the M90 and the two might be what it takes. I know others have done this but I haven't found what the limit is with the M90. Or will limits of the M90 still plug up the system so it is still not enough???? Inquiring minds want to know, LOL. But I want to make the old Pontiac 4 cylinder work somehow. I'm just nutty that way. I know I can make big HP but at what drivability cost?
You asked about the Shot gun scoop. It's one of the cheaper aftermarket scoops. I made the bottom plate to work with my carb spacing and the plate will eventually get welded to the scoop so seals it completely. Those inlets are welded solid as well. I'm not at all sure that I'm not shooting myself in the foot with all the different volumes (the scoop, the tunnel ram plenum etc) but we'll see how it works. I'm hoping the large area above the carbs will allow the carbs to get less turbulent air as it goes down thru. I can always change to twin hats later. It won't have the "BLING" factor of the scoop but I can live with that if it cures any spooling or other problems. It will be interesting.
Sorry for the long post, ya got me going there.

Mark

Formula_Fire

Not at all man nice to see someone doing something with the pontiac engines. We're a little off topic but it gives idea's. Pontiac engines are torque monsters on the low end so I wouldn't worry to much about that a proper cam should make up for the spooling and as far as top end these engines aren't made to spin high to begin with. Keep in mind supercharger + Turbocharger = A TON of heat. I'm planning a dual turbo setup for the 350 pontiac I'm building but its just for fun I'm not gonna go too crazy with it I don't plan on having more that 2k into the whole setup including the engine. Basically I just wanna be able to shock a few of the latemodel camaros and mustangs by giving them a run for there money with my old slow 3rd gen lol

Formula_Fire

Sooo.... My buddy totaled his LT1 modified low mileage camaro and flat out gave me the entire drive train Engine, trans, drive shaft, axle, pcm and harness, everything... So looks like I will not be doing this swap after all. Anyone looking for a low mile 350 pontiac short block, heads, intake or other parts for their build?

I kinda hate to give up on a true pontiac in my firebird but this swap is a bolt in and will make more power right out the door.

Marks Tempest 4

The Pontiac would be nice but no one in their right mind would pass up what you got. i'd go for the P 350 if the shipping was not so much. Do the LT1 and don't look back.

Mark

Formula_Fire

Yea shipping would be in the 150 to 200 range most likely. Maybe I'll keep it for a rainy day.

smh1987FFB

I just picked up a 400 this weekend. The 350/700R4 are up for sale. I going from a Chevy/auto to a Pontiac/manual so I'm sure there will be some hurdles to overcome. I'll update here with pictures when I can.

Formula_Fire

Awesome man I still a poncho man at heart and love to see when things go right... I just can't pass up this deal.

JayBird12

hey guys i need some suggestions... i have a 83/84 pontiac firebird... it curtently has a 6 cylinder in it... it turns over but doesnt get fuel... i think its the fuel pump that needs replaced to get it running...but im planning on rebuilding a 350 small block out of a half ton... but theres a catch... the car is currently automatic... would like to get a 5 speed transmission just dont know what type of transmission to get that will withstand the torque and power this 350 will put out when its done up... would like it to last.... would a t5 withstand the power that the 350 is putting out? and any tips on mounting the 350 into the firebird? thanks for the help!!

JayBird12

hey ... ive got a 83/84 pontiac firebird... it has a 6 cyl in it but not sure exactly which one... and im planning on rebuilding one of the 350's out at my grandpas an doing the swap... but id like to go from an auto tranny to standard just dont know what transmission will fit under the car and mount to a 350 correctly... im pretty sure i have a t5 but im iffy about it taking the abuse and being able to take the demand that i have.... like i want a tranny that will take the use and abuse that will last!! any suggestions? thank you