budget build with a new to me 354"
 

i picked up a 68 350 for a song.
it was stored in a car, but got some moisture in it.

.030 over, piston # L2339
stock rods
stock crank
72cc 1.66 and 2.11 valves. edelbrock RPM heads
comp cam 51-234-4

first step was to disassemble.
i knew this going into it.
but me, in my infinite wis"dumb" decided to take the front cover and pete jackson gear drive before i pulled the heads.

after the heads were pulled, i found that every exhaust valve had come in contact with the pistons.
and i cant verify if the timing was correct.

the moisture/rust that found its way into several cylinders, wiped out the cam for sure, but the cylinders are only stained, and look ok to run.

ive owned pontiacs for 25 years, but i usually just threw these 350's aside.
was cheaper to build a 400:rolleyes:

whats the deal with the 4 valve reliefs?
at this point, i gotta pull them anyways, and im having random thoughts on chucking them up in the mill and making my own.
i want to run it! its a viable block.

but i want to do this as cheap as i can.

i do have several sets of heads ranging from 16's to 6x-8's...

also thinking about running a set of T04e's if i gotta do this in low compression form.

the car its going into is a garage built 1930 olds-ish 5 window coupe
curb weight is 2400# its got a powerglide in the trans shop right now,
4.10 rear gear
suicide front straight axle, traverse leaf
truck arm rear 8.2 with new axles and locker

WWMTD?

https://forums.maxperformanceinc.com...ictureid=14191

seems like you could get a few bucks for the edelbrock heads if you are going to use stock d ports instead? that would subsidize a big portion, no?

The Edelbrock heads configuration moves the Exh valve over .040" closer to that side of the cylinder to allow a straighter path for the Intake port .

Even with that being considered, that motor must of been running a good amount of lift to cause the Exh valves to kiss the piston notches!

I hope you are building this motor for racing because you will need to spin to up to 7500 rpm to make good usage of those heads 215 CC Intake ports!

the cam was only a .480/.480 lift.

i dont want to sell the heads, i would like to run them on the next build which will me a 6.800 rod 400"

im trying to budget this engine so i can save the cash for the above engine...

also too many irons in the fire here.

Nice hot rod.

wow - Great find!

I'd find some cheap pre-1970 small valve heads with 72cc or smaller chambers - those can often be had for a song.
I think some were being offered for free in a recent Smoke Signals - but location would determine if that might work.
If you go for some thing newer than 1970 just be sure you don't get a "400" or worse, a "455" head;
Stay away from 4X, only do 6X-4 (not 6X-8), 1973 #46 heads can be had for super cheap, and 71/72 350 heads are also generally give away heads.

I think four valve reliefs are standard fare for all but custom pistons these days;
From a quick google search those appear to be a forged slug.

I have long been a proponent of the P350 - I get why people have traditionally tossed them in favour of rebuilding a P400, but they are great motors for what they were, especially when stacked against a bread and butter same year Chev 350.

Good luck!

Where are you located? I have 2 pairs of 350 heads from 68 and 69. 47's and 17's.

Based upon the picture, I would say somewhere in the Sacramento Valley of Calfornia

Why not keep the e heads on there with some cometic gaskets and throw the turbo on? Then I’d be thinking of the rods and pistons but at 2400lbs…..ssssshhhhhhh it would move out.

I guess you have forged pistons? If so throw some rods in there and boooosstt lol

One thing I would like to make note of is your foam air Cleaner your running, And the fact that pasta strainers filter air better then those F.ing things do!

I ran those on the duel quads on my street blower motor and found myself re-ringing and re-honing the cylinders due to dirt Intake after only some 20k miles.

not a foam element, its actually just a marine spark arrestor.

i would throw some rods in it, but im pretty sure these are pressed in wrist pins.

which would require another set of pistons too.

i still havnt made a decision on what im gonna do yet.
ive been having some good months at work, so i may just slap this together with some iron heads and use the e heads on the next build,

appreciate it, but i do have several sets of heads from 326-455's
ive got quite an array of heads built up in stock since ive been running pontiacs since 96'

thinking too much compression with those e-heads. or any 72 cc head to run a turbo safely

heres one of my oldest pontiacs ive owned...
bought it in 97. and it just got back from paint
https://forums.maxperformanceinc.com...ictureid=14196

Isn’t a 350 with 72cc heads still only at about 9.5 to 1? And that is with a small gasket. I know an 80cc head is like 8 to 1 on them, and that’s Pontiac’s advertised compression isn’t it?

3.905 bore
3.75 stroke
+10cc estimated valve reliefs. cant find specs on the piston
0.010 deck height
0.030 CHGT
72 cc head
gives me a 9.2:1

"...+10cc estimated valve reliefs. cant find specs on the piston..."

I think those valve reliefs are closer to 5cc than 10. Not as deep as the L2262F TRW 400 flat tops, which, IIRC, were only about 6.6 or 6.7cc.

ACTUAL deck height is critical, if using a high lift cam. There are plenty of lower lift cams that will make power to 6000 rpm, in a 350.

Usually, the problem is that if you run enuff cam to make good upper rpm power, the 350 don't have much low rpm power. Therefore, converter stall speed, & rear gear will be critical, especially with the PG trans.

The entire package will need to be correct, whereas a long stroke engine, such as a 455, has enuff low rpm torque, to make up for a reasonable package that is not designed to make gobs of low end power.

9.2 with aluminum heads is great for boost especially if you are under 15 lbs. A little thicker cometic head gasket that you’ll be better off with if you turbo it anyway and you are high 8’s compression which is perfect for boost. My brother runs a 469 with an 88mm on 9.3 compression and e heads. The thicker cometic would give you the room for higher lift too and with the boost there isn’t a power problem anywhere and it would be super cool. Lol

I would not count on any iron hi comp head truly being 72 CCs until you do prove that out.