Anti-Venom

Because 400s are few and far between, 350s are a dime a dozen. That's why.

Grammar? Really? Nice. You got me, i'm done.

FireDemonSiC

I know you weren't hating. My past few posts weren't directed towards you.

FireDemonSiC

kmcn47

i'm sorry is the argument that you build a 383 because 350s are more common then 400s even meant to be taken literally? you know ya need a 400's crank to make a 383 out of a 350 right?

conlinj

iTrader: (3)

I think your probably going to want a smaller cam, I have the XFI280 in my 355 and it's pretty choppy. The 305 will make that worse, you may want to consider the XFI252 or XFI260. Any kind of TPI motor doesn't like to rev past 5200, the XFI276 makes peak power at 6000+

-Jim

conlinj

iTrader: (3)

You know many aftermarket companies make 400 cranks right?

FireDemonSiC

Well aware. This is not a stock TPI. Check out the porting photos.

Also, stroker motors are better at handling higher duration cams. The least I will put in will be a 270. A 252 or 260 will be leaving power on the table.

Johnny Blaze

iTrader: (15)

Not many people build 383's with stock cranks these days, too many cheap aftermarket ones, not too mention the OP is buying an aftermarket stroker crank for the 305.

Johnny Blaze

iTrader: (15)

I think a 270 is a better choice, yes it is stroked, but still only 334 ci, and yes your tpi is pretty ported, but still.

I would run some sims, or at least talk to someone at Comp and see what they think.

FireDemonSiC

That is in the plans before spending the money

Johnny Blaze

iTrader: (15)

Excellent!

FireDemonSiC

Sorry it looks like I completely missed this post before.

What do you suggest using to get to curved area of the runners? The only thing I can think of is an extrude hone job.

FireDemonSiC

IIRC I tried plugging everything into the comp cams simulator. The 276 produced something like 3 - 5 HP more than the 268 but lost 14 ft/lbs. This was however assuming the stock stroke of 3.48" since their program doesn't allow the selection of a 305 stroker LOL.

Johnny Blaze

iTrader: (15)

Flex shaft dremel for porting.

FireDemonSiC

That's exactly what I used to open the siamese. You cannot get down into the turn with a flexshaft. The only methods I'm aware of that work is either an extrude hone or cutting the runners open then welding them back together.

Take a look at these photos. I don't think some of you guys understand just how much material was removed. I effectively shortened the runner length while extending plenum volume. It is only the turn I wasn't able to gain access to, although I know it is still a bottleneck.

https://www.facebook.com/video/video...94870590540108

conlinj

iTrader: (3)

While you may have added plenum volume, it may be too much. And you probably have disturbed the port velocity as well. Should be interesting to see the results though, good luck with the build.

I still think the 270 will be a little large, you may gain some peak upper rpm power, but your giving up torque and mid range power. Look at all the results with the LPE219 cam

kmcn47

cheap aftermarket 400 cranks eh? all the better to build a 400 with

Johnny Blaze

iTrader: (15)

Too bad 400 blocks are getting pretty rare, oddly enough they seem
to have decreased in value. Guess the aftermarket blocks have had an impact.

I have a 509 casting on the stand just waiting to be assembled for my 71.

FireDemonSiC

A few months ago, I had a chance to buy a 511 casting complete 400 longblock for $100.

I decided to pass on it after the guy wouldn't let me remove a head and the oil pan to check it over. Boy am I glad I didn't buy that motor...

ChevelleFan

iTrader: (4)

It was $100, what did you expect? If it was all known-good stuff, then the price would certainly have been higher. It's not like he wouldn't let you inspect a $1000+ engine. At $100, its priced to move, not to have someone tear it down, look it over, then offer $50.

-Dave

FireDemonSiC

I just love how everyone on this forum is so opinionated...

OK, so here's a quick story on what happened with this 400...

On my previous job as a parts delivery driver for advance auto, I went into one of the local shops ran by a jamaican dude named Earl. I looked and saw the smallblock sitting on the floor and expected it to be your typical 305/350 since these are practically everywhere. My jaw hit the floor however when I ran the casting number. My jaw hit the floor again when he told me he'd sell me the complete motor for $100 and that the only problem with it was a "Stick-ee liftah mon!". Things underneath the valve covers and in the lifter valley looked clean. Perhaps a little too clean and this raised a red flag.

I thought it over for the next couple of days and figured I was going to buy this motor, rebuild the stock bottom end with new rings and bearings since a 6.6l wasn't going to need anything fancy in order to make some good numbers, then drop around $1600 - $2000 on a set of good heads and a cam kit since obviously flat tappet and call it a day. With one exception: he let me pull a head and drop the oil pan first. He got offended when I asked him this despite the fact I told him I would re-assemble it even if I didn't buy it. I decided to back out at that point and called my friend since he was also interested in it. The next day we throw it in the back of his blazer and he's off.

So, what was the final verdict on this 400 you ask? He tore it apart the next day only to discover that the "stick-ee liftah" tap was actually 5 spun rod bearings. The crank and rods were badly blackened so not re-usable. The whole bottom end except for the pistons was shot. It also turns out this motor was a jasper rebuild and had already been bored over once. At the machine shop, the end cost was $1600. It had to go through all the usual tests and refresh techniques plus it needed an alignment bore and IIRC he had to sleeve the cylinders but don't quote me on that one.

Would you have been able to trust the integrity of this motor after that? Had I had the chance to inspect it, I wouldn't have offered him a thing. If it had checked out though I was prepared to hand over the $100 because that was already dirt cheap.

Johnny Blaze

iTrader: (15)

Any updates?

You talk to Comp for cam specs yet?

cuisinartvette

Ditto on not going too big on the cam. Runner length is runner length cam accordingly.

Gotta get to that bottleneck on those runners...can siamese and make the opening big all day long but withouth that improved you wont see the gains youd think you would.

FireDemonSiC

Sorry for the delayed response. I'm taking a much needed vacation from the car scene. I've been hitting my car hard since the spring of 2011 and took it from rags to riches but I need a break. I'm concentrating on re-aligning some things in my life and putting myself through school. The engine will come when the time and money is right (Since 2011 I've dumped somewhere between 15 and 20k into the car). It is definitely on the radar. It is THE LAST unfinished aspect of the car and until it is done, the "devil machine" is still an incomplete project so it is definitely getting built. I've come way too far to bail out now.

I did talk to comp. I told the tech the specifics on the motor and my goals and to my surprise he actually recommended the 280XFI cam (And specifically said that taking forum advice was a BAD idea). However, I feel that this would be too much and am not comfortable with running this much duration on the street much less with a TPI in general.

It looks like I've decided to go my original plans of the 276XFI. The tech told me a custom grind would not be any additional cost and just means they don't offer a pre-ground cam with those specs. So plus for me.

However I am asking again how to go about getting at the turn in the runners. The dremel flex-shaft will not reach that far back so how am I supposed to port the "runner abyss"?

wbstearns

305's can be cool my first f-body was an 87 formula 305-5speed car and i absolutely loved it it had had some work done by the p.o. but i have no idea what i suspect a can and computer work. now im building a inexpensive "leftover parts motor" after i build mine it will be a 305ish motor that chevy should have built a 30 over 302 in all reality so keep us informed

305sbc

iTrader: (3)

subd.

Blk91Firebird

Any updates or anything new? lol

FireDemonSiC

https://www.thirdgen.org/forums/post...21-post74.html

NotsosleepyZ

cant wait to see this things numbers, I got the 30300003 heads for my build got the heads last week, look awesome unfortunately my car sits 750 miles away from me so all I can do is look at my new heads, headman full length headers, 268xfi cam and kit, and intake manifold and make vroom vroom sounds in my head all night till mid may lol, my pops runs a body shop so my project should sky rocket this fall ill post pics as it gets along the way, we built a 70 Camaro for him this summer took it from rags to riches, but the engine was already rebuilt, so we focused on his body first

FireDemonSiC

I just started my new job I'm going to use to put myself through school and they're starting me off at 11.50/hr so hopefully things start falling into place soon.

My car the engine is going into is actually in the April COTM voting thread right now.

FireDemonSiC

BUMP!

I know everyone is still wondering what is going on now that this post lies dormant. The time is near my 305 brethren. In a few months I will buying a second vehicle then it's game time!

On a side note, to add insult to injury, I have fully restored the A/C in my car which I will be carrying over to the new motor. The 334 will be rolling down the road with the vents blowing cold

NotsosleepyZ

nice, i was going to ditch mine but seeing as it was converted to r134a already and its been humid as hell i think i will keep it, i just put the heads and intake on mine lastnight unfortunatley my phones sd card broke or burnt or whatever made it quit working and i cant get pictures

zday

iTrader: (1)

I actually have the 276xfi cam in my 305 and I love it. I think for my application it might be a little much but I wanted the nasty rumble when u pull up. My 305 is basically stock it got the cam, magnum roller rockers, headman short tube into a full 3" system with a single flowmaster super 10, a street strip intake and a Holley 650 double pumper. So I think with you stroking the 305 out to a 334 with the good heads and taking that much material out of the intake I think you will be very pleased with the cam, but if I was you I might look into some larger injectors and fuel pump to be able to keep up with all the extra air. I will be looking forward to see what kind of numbers this combination will put out, it will probably suprise some of the 350 guys. Lol

FireDemonSiC

The fuel pump in my car has a bit of age on it (Was in installed by a PO around 2005ish) but it is a Walbro 255.

The injectors are Bosch III 22/lb so I'm hoping they will be able to deliver. If not that sucks but hey I can always swap out.

Good to hear about that cam!

The time is near. Just waiting on the daily driver around septemberish. Have a good stable job making good money. I didn't start with the engine as soon as I would have liked but it is coming. I promise!

zday

iTrader: (1)

well the pump should work then... i run a holley 255 pump in mine.. and the amount of money that it takes to build the type of stuff i can tell u and i both love to build most people just dont understand..

cuisinartvette

FireDemon only way I could get down in there was as you found other than having to siamese was to take the wall down on the bottom side where its thick, follow it in far as possible. Then you can get a 6 in carbide down in there. Even at that its difficult to control and truly be effective.
Cutting/welding would be easiest imo. I wont port/siamese runners anymore unless they are cut open simply isnt worth the time. Siamesing is overrated on its own.

FRMULA88

Enjoy your project and the power level you have decided to play in.

Just keep several things mind when you are ready to upgrade:

Your old engine will not be worth much to anyone else, except another 305 afficionado.


IF you decide to spray or boost...... A stock block was not
engineered for high HP / TQ stresses especially under boost or Nitrous (elevated cylinder pressures) no matter what you have for a rotating assembly the stock block will eventually lift the heads or fail in some other way. This does not have to happen at the dragstrip.. you can be having fun on the street or expressway.

This goes for ANY OEM engine block, not just the 305.

I have seen too many people build a "high performance engine" using all the best internal parts, great heads, etc, etc, but are married to a OEM block..

Typically this is a recipe for disaster. but does not have to be when there are many affordable aftermarket Hi-perf engine blocks. Even if you want a
"305" you can use an aftermarket 350 block and de-stroke it...Like a DART SHP block,, it can handle over 600 HP.. and it pretty affordable.

at least you never have to worry about the block no matter what you plan to do in the future.

An aftermarket block will always be worth more on a resale... you never get your money back on these deals but at least it will be easier to sell later on.

Also you or and the next guy have the option of simple changing the crank to turn the "305" into a 350, change the rod and make s 383...


FWIW don't limit your options using a stock 305 block that does not allow you the ability to make changes (easily) in the future. and there is no worse feeling than blowing a head gasket because the stock block is the weak link.

FireDemonSiC

Sorry but I'm not following your logic other than maybe the 2 bolt mains.

Plenty of strong engines have been built on factory blocks. I'll probably end up tossing a 100 shot at it and calling it a day. If it blows, cross that bridge when I get there.

FRMULA88

Tell me son, how many high performance motors have you built?

Not many if you think a stock block will last very long.


read & understand what you are getting into before you do it twice.


http://www.hotrod.com/techarticles/e...ck_comparison/

FRMULA88

A stock 305 will live just fine with a 100-125 shot of N20

I did this to mine 14 years ago... with over 120,000 miles on it..

had fun for 2 years then sold the engine & built a 383.

Sold the N20 kit 2 years ago... never used on the 383.


when you start making over 500 hp the stock block is garbage.

FireDemonSiC

Appreciate the son comment there old timer.

If you think I'm planning on making huge power with this motor, you're dead wrong. Truth is, I really don't want to boost it because I know I will be pushing the limits of the 2 bolt main. Not to mention the 7.5" ring gear.

Again, people seem to be under the misconception that I am building this engine to compete and break records. I just want something with good power that will be fun on the street.

I'm not doing the nitrous off the bat. I'm going to see how the car feels on all motor then go from there.

Thanks for the link though I will check it out.

NagleMac

iTrader: (1)

I'm assuming you keep putting 305 in quotes because you already know that you can't actually make a 350 block into a 305, but if not, YOU CAN"T MAKE A 350 BLOCK INTO A TRUE 305, aftermarket or not.

FireDemonSiC

He did raise a valid point. However, what no one seems to understand is that I am NOT here let me put it in bold for everyone

Not trying to achieve LSx power levels or get a 10 second car.

The motor will live N/A perfectly fine with everything I have planned. Will it hold up to a 100 shot ontop? Probably. I haven't come to a final decision on it yet so my research in that area is skimp.

He seemed to be under the impression (From the "son" connotation) that I am a young punk who has no idea what he's getting himself into.

The D1SC comment was only a future possibility but again I I haven't crossed that bridged yet so I haven't done the supporting research. I'm not simply going to put 8psi through an already radical motor and assume it will live.

NagleMac

iTrader: (1)

Don't worry about these guys. All of a sudden it's only about being fast to them. Look at the true hot rodders and now the rat rodders. It's not about being that fastest, it's about being different, looking different, and being loud. These other guys consider themselve to be "car guys" or "gearheads" but can't even appreciate the beast that you're going to turn this 305 in to.

Kinda reminds me of that movie "Wildhogs" where those "badass bikers" think they need to put on an act for everyone to make them "real bikers", but in reality it's about loving to ride your motorcycle. Same thing applies with this.

Fast355

iTrader: (2)

YOU ABSOLUTELY CAN!!! Its called a SLEEVE.

FireDemonSiC

Or I could avoid a totally unnecessary spenditure and just use an actual 305. Lol.

NagleMac

iTrader: (1)

Exactly

FRMULA88

LOL go enjoy that theory, I have been going fast for 20 years not some idiot that thinks rad rods are the best thing since sliced bread,, posers with their junk.. they do realize guys who drove their cars in primer actually painted them!? We had only 1 car and needed to get to school and work with it. We did not prime our cars or aspire to do crappy fab because we thought it was cool.. Fact is we aspired for excellence.. pride in our work and yes go as fast as we could..

Guys like Chip Foose took off from and were inspired, like my generation, by Codington, Butera, Sullivan, Roth, and so many other artisans / speed freaks before them.

True artisans, craftsmen, and hot rodders.. that is what I aspire to and admire.. a bunch of dorks that can't replace a fuel pump... not so much LOL

FRMULA88

Food for thought: Not one real builder I mentioned ever used a 305 for anything... well maybe for scrap. LOL

3rdgenlewis

I've been reading some of your reply's to these threads and I have too say, while I may not know as much as you do, and I may not have the experience you do, why do you care? Why do you act like such an *** hole?

It's not always about who's the fastest here.. with me I'm running a 305 in my Camaro and getting help with a full top end rebuild, only looking to make a high 12 second, or low 13 second car.. Maybe mid 12's on N20. Why is that not good enough for a daily driver? Why can't this guy build what he wants and be proud of what hes done? Mustang guys build 281's all the time and don't get told to go build a 351W or something.. C'mon now.. It's his money, not yours.

If it's about speed, why are we even focusing on cars? Line up with my 2009 GSXR 1000, with bolt ons.. and I bet I'll take your best car and make it look silly.