351 heads on a 302

[1fast4]

Is there any advantage / disadvantage to running stock 351 heads on a 302? When I bought my 86, it had everything there to build a 351 minus the block.
The motor was from a truck.

Any way, as long as I have the motor torn apart deciding which cam to go with, I thought I would throw this out.

[dumpycapri85]

What casting is the 351 head ? Most are the same as the 302 head with bigger bolt holes unless its like an early 4v head like a c9 . They have a bigger valve but also a large chamber so the compression on a 302 is not great .

[1fast4]

I was thinking that it lowered the compression. This motor will be bottle fed. If/when I go turbo, I can do a head swap then.
Still trying to squeeze as much out for as cheap as possible.

[Kart21]

What casting is the 351 head ? Most are the same as the 302 head with bigger bolt holes unless its like an early 4v head like a c9 . They have a bigger valve but also a large chamber so the compression on a 302 is not great .

yep, early heads don't have hard valve seats. Need speical head bolts $$$$$.

[turbos66coupe]

yep, early heads don't have hard valve seats. Need speical head bolts $$$$$.

Bolts are easily fixed with step dowels for $50 from any performance parts place ie summit etc.
The valve seats could be an issue as they don't live long with unleaded fuels.

And I thought the c9 had 58cc chambers and d0e had 60cc chambers. Either way it used to be a cheap and really the only performance option but comparativly speaking they suck. If they are e6's turn them into boat anchors and e7's well nothin special either.

[smokey3550]

If the truck is 1970-75 351 the heads are worth swapping they have bigger ports and valves and a small chamber I think 68 or 70cc. I used a set of d5 heads from a 75 truck and put in 2.02/ 1.6 valves with a bowl cleanup and exhaust porting on my 393 stroker and they worked great.

[1fast4]

Yup E7's. O well.