Ok heres the deal. What's it going to run? Its a junk yard dished pistoned 350.
The motor is used but runs fine. Going to swap on some low buck parts and see what she'll do at the drags for grins.
here's the reciepe:

junkyard stock bore 350ci SBC
Fully ported 305HO heads (1.94x 1.60 valves) 61cc
the heads flow 232cfm @28"
Thin head gasket
The compression ratio will be 9.8:1
Edelbrock Street tunnnel ram 2 edelbrock 750's
Long tube open headers
Isky solid lifter cam 282-282 247/247@.050" .507" lift 108LSA. 1.5 rockers
car is Third gen Firebird 3550#'s including driver
3500stall 4.10's 26x 8.5" slicks
How much horsepower will it make?
How fast will it go.
Is it going to go?... .. or is it going to blow?

 

....

 

That would depend in large measure, on what junkyard 350 short block it is....

 

it your typical stock passenger car/truck low compression stock dished piston 350 SBC
70's to 80's era.

 

OK:

I don't think you're going to get 9.8:1, I come up with more like 9.45:1 (15cc dish, .018" gasket, .025" deck clearance).

350-360 HP; low 13s. Like 13.1-13.4 depending on gears, converter, traction, and all that usual stuff.

You starting up a pool or something?

 

I get 9.8:1 12cc dish volume .025" deck clearance .015" shim gasket 3.2cc volume
61cc heads.

ya we could start a pool.... or something.... all just for fun and giggles...

The car already ran 13 flat @105 using a typical flat top 350, vortec heads rpm manifold mild generic hyd cam and 750 carb with the same trans/converter and gear. the cr was 10.03:1 the vortec heads flowed just a little less than these ported 305 heads do on the flow bench.
That motor was 360 to 375hp.
Let get the dyno and quarter mile ET simulation software out and ..... going here

 

And what colour should I paint it????

 

Pantone 3405

It'll be the only one at the track like it!!!!

I used to know a guy that painted all his motors purple; the most garish, gawd-awful, pukey kind of purple you could imagine. Maybe, Pantone 235 with some metallic thrown in. If he caught you at the track (a round one) running his motor and it wasn't purple any more, he would fire you as a customer. Which was kind of a big deal, because he built an OK motor.

 

Mary Kay pink.

 

And what colour pokka dots???
Just rough measured the piston dish...could very well be 15cc.
When I get it cleaned up and on the engine stand I'll measure more accuratly.

Looking at the combustion chambers it appears the motor was running nicely
Nasty small valve 624 castings but usable rocker arms.
how about a dark commercial green to sorta match the car... with Mary-Kay Pink engine bolts.

 

sounds like a fun project, let me know how it goes.

 

Puke-ish green, of course - what other color could you even consider?

 

I would paint it like 4 different colors paint the fenders black and the rest red and primer with a white panel in there somewhere! And my money is on mid 13s unless....

Do you have a 150 shot laying arround

 

Oh, if it gets the Nos, it will get a lot bigger shot than that trust me.

 

Did everyone miss this? ^ ^ ^ ^ ^ ^
There might be a slight problem with a slight bog at WOT...
I LOVE junkyard dogs BTW.

 

A friend of mine here has a prostreet Dodge Rampage with a Chry 440RB with a Tunnel Ram and two 750 Edelbrocks. Works just fine. Needed a little dialing in.
If I find that the 750's are just too much for this motor, I'll change to a smaller pair like the 500's. Still have to locate a another carb yet to make a matchng pair.. These carb have a sec air door (velocity valve) that tends to "size the carb" to what ever the motor needs for airflow and ,maintain velocity. A lot more flexable than say a Holley double pumper. I think it will be fine but have no problem changing things, if not.
Going to get it up and running and drag strip baselined with a Single carb and a RPM intake first. Got to find another stock hood for the car yet as well.

 

Man, you gotta post video!!! Especially with the tunnel-ram sticking out of a cut-out hood...
That's gonna be Bitchin'. (can a 50 year old say bitchin?)

 

That's going into your green firebird? What's up with the 406 Vortec in it?
That motor will give me hope, especially with the RPM intake and single 750cfm edelbrock carb.
That's a big cam, solid flat tappet right?
Got the whole flow sheet for these heads? These your best (or most recent) effort on a set of 416's?

 

Yep. It's a big nasty single pattern 108' LSA ISKY. An excellent choice for the application, but than again I'm partial to Isky's. Hopefully, if he's got good valve springs, he can tell us if the myth about the stock bottom end only being good to 6500 rpm is true. That combo should sing at 7500.
~chanting~ video...video...video...

 

Nothing is up with the 406 other than it won't pass the smog test here. Runs great otherwise. So out it comes (temp) and in goes a near stock smog friendly low buck 350. Then, add the power parts and have some fun. These heads are the latest but no the highest flowing set to date. never did a complete sheet on them. They flow 218@.400" and 232@high lift. (these heads always stall out at .500" to .550")
Something to beat on. If it breaks it gets yanked out. have another 350block,crank ready in the bullpen. LOL
I don't think this motor is going to want 7500rpm at all. More like 6500. maybe 6800with the tunnelram. the cam just is not that big. May go bigger later.

 

Well of course it's not going to want 7500 but here's the cam:
Number: 201027 grind:Z-27 rpm:2800-6800 lift:.507 lash:.018 adv dur.282° dur@050:247° LSA:108°
So, 6800-7000 it is!
I need to know because my Isky cammed engine with balanced stock 2bolt bottom end, still pulls hard at 6700. I just need a stunt-man to test the waters...
p.s. I finally found the degree symbol- ° no more ' .

 

do share how you got the degree symbol... alt-xxx ? Like è is alt-0232 ?

 

° = Alt-0176

There's so many cool ones... ½ =Alt-0189, ¿ = Alt-0191, etc.... much as é (accent aigu) is Alt-0233 or the e accent grave è is Alt-0232.

 

It's MY SECRET!!! Damn you Sofa!
(actually I cut&pasted it by accident)
Sofa, how about posting a list?
...Mister smarty-pants

 

SofaKing: You are right, the piston dish volume is 15cc, not 12. piston deck clearance@TDC is.025"
So the compression ratio using a.015" steel shim gasket will be 9.49:1
Propabily a good thing that it's just 9.5:1 as it will tolerate a good bit of nitrous easier. It's probabvily going to see some abuse ...

 

I found this website to help with special characters: http://www.forlang.wsu.edu/help/keyboards.asp#map

 

F bird what heads do you have 601 , 416 ?

 

Based on the chamber, I am going to say either 416 or 081. The 601s have more of a L31 vortec shaped chamber.

 

These are the 416 heads. They have a full on port job and flow quite well. The 601's are nothing like a vortec head. If any of the 305 heads would be considered simular to vortecs it would be the 081 and 083 heads with the spark plug boss projected into a more central position in the chamber than some others.
The 601's a just a more shrouded version of the 416's. More rounded kidney shaped than D shaped. The chamber walls hug the valve radius around the intake vale moreso on the 601's.
Never checked the 601's port volume.

 

F bird could you post a close up of the chamber on the 416's to show the
shape? Thanks

 

The 601s ARE more rounded, like the Vortecs kidney bean shaped chambers. The 601s chambers are 52-53cc in stock form, but usually end up around 60cc. I usually cut them for 1.94/1.60" valves and unshroud the intake valve. I use them on most of the high hp 305 builds that I do. The 416s and 081s have the same basic chamber to them, just the spark plug is more projected on the 081s for cleaner emissions.

601s







081s



(PS you can actually see the cracks between the chamber and the head bolt hole on the right most chamber, letting coolant into the cylinder and giving the white chalky look.

 

The 416 chambers look like this when I'm done. Finished volume on these ones is 61cc.

 

F-bird have you got this engine running yet, just wondering how it ran

 

Not yet. Got a re-ring kit and did a 10-10 crank. The block is honed. Needs a good scrubbing and assembly. The Isky cam is on order from the US. No stock in Canada.
Oven cleaner did a good job on the block and piston tops.

 

Oven cleaner is that the Vizard trick I read about in popular hot rod.

 

I'm sure Vizard has used oven cleaner to degrease and engine block at some point. LOL Well the Isky Z-27 Cam has arrived from the good old USA. Cam card specs indicate the cam goes in with no advance. "straight up". So I'll be degreeing this one in a dialing in 4 degrees of advance to promote high overall torque over the usable rpm band.

 

Aw, c'mon now. I thought you were going to leave the shortblock stock??
You're only 1 set of forged pistons away from building an engine like mine...
(don't tell me i have a junkyard dog)
What valve springs are you going to put on it?
Keep us posted.

 

There was some light rust on one of the cylinders. I got a set of hastings rings and 10-10 bearings and a full gasket set for a very good price, so I couldn't resist.
No forged pistons thou. The stock cast dished pistons cleaned up very nicely and I have a 10-10crank sitting here, so.... I could have left it as it was. The crank and bearings were near pristeen. So it gets a cheapy quick back yard freshening.
the valve springs are Comp 981's. Installed height is checked and shimmed to my specs on all. I could tell ya what that is....... but, I 'd have to cill ya then...

 

Any thing new on this engine?

 

Ya, bought a new harmonic balancer. Doesn't fit. Had to get the center hole honed out about .0015 to reduce the press fit a bit.. The press fit was a little too tight. Got side tracked with other stuff for the car. New (to me) hood for the tunnel ram. Interior parts etc.
The short block is together. The Isky cam has been degreed in (was already 4 degrees advanced so no cam timing adjustment was nessessary) The mild Melling MTC-1 cam is in it now. (emissions) and all buttoned up.
The measured lobe lift of the isky cam was .332" not the advertised .338". (.498" valve lift as opposed to .507")
Thats ok, it allows me the optional choice of using 1.6 rockers to increase net valve lift, within the limitations of the 981 springs.
I just happen to have a half set of 1.6 rocker arms kicking around.
The duration was as advertised.
Lets just say the new piston ring end gap and piston to wall clearance is very "Nitrous friendly" now....
Still looking for carbs. Either another 750cfm performer or two 500's.

 

Sounds like you are making progress. Let me get this straight you are going to put the motor together emission test it then change cams? Sounds like a lot of work. Might be easer to just have a old 305 around
and just change motors.

 

Any progress on this engine?

 

Well this is the "old stock motor" to get 'er thru the emmisions. Just could not resist freshening it up a bit. And playing a bit. I also have another whole different 350-4 bolt block and crank W/ full machining and decking waiting for a rebuild kit. So this block will likely end up going back mild probabily with another set of 305 heads (think I can resist playing with a set of cylinder heads and just bolt them on stock?) Or maybe it will get a pair of fully prepared large chambered 920 castings for low compression and a B&M or 6-71 blower? (Just happen to have a set here that are near finished)
Anyway went to bolt down the cylinder heads and discovered I did not have enough cylinder head bolts. So had to go buy a set from GM.

I also lengthened all the intake pushrod slots to allow for 1.6:1 rocker arms on the intake side. Did it by hand with a file without dissassembleing the heads. I was not origionally going ton do this but.... now that tuning option is open to me as I have a half set of new roller tip stock type 1.6 speed pro rockers kicking around here somewhere.
Kicking around the idea of different nitrous friendly street solid lifter cams that will work with the 981 springs (easy on near stock valvetrain) and/but could use the extra lift on the intake side.
eg: crane #113841 and 113861
GM Z/28-LT-1 #3972182 crane#969551
GM 1st design off road Z/28 #3927140 crane#968821
All these cams could benefit fromthe increased intake lift at the valve. Any and all these cams would make good street blower cams for a future build.
So this particular piece of.... could develop in many different directions depending on what falls out of the sky. or it could come unglued in the first WOT blast.

 

"Colours" are only available overseas and maybe up there in the "Great white north". I'd paint it with Martin Senior's Cast Blast. That way it doesn't look painted at all! Seriously, it gives the motor a good natural cast look and goes well with black, chrome or whatever. Just one man's opinion.

 

F bird you sound like me I even ported the heads on my snow plow truck.

 

I like the look of that cast iron paint. The block and heads will be coloured black. Might do the valve covers cast iron colour thou.

 

Oh YEAH! Black & Nasty. Like I like 'em.
Nothing like dusting someone with a color-coordinated engine compartment and having them look under the hood and see this:

 

Especially disturbing when you look a the end of the heads and see the 305 casting identifier when you expect to see the double hump.
"WHAT - THE - *&^$% !!!!"

 

Heads are on and torqued down with new bolts.
rockers are all adjusted 1/2 turn preload.

A few pics

 

With the RPM manifold. 1.6 intake rockers 1.5 exhaust. Cleaning out my stash of SBC parts.