How to identify "302" heads???
9.2:1 cr stock 318 with flat top pistons
.040 ths down in the hole.
(1968-69 stock 318 valve relief pistons).
Factory 230 hp engine
9.2:1 cr Stock 1991 318 Roller Engine
Factory 230 hp
Flat top pistons with no valve reliefs.
Same .040 ths down in the hole, so these will give a bit more compression than the 68-69 valve relief pistons.
Mr. Gasket Head Gaskets 1121G
.028 ths compressed thickness.
vs Felpro .035 ths head gaskets.
302 Closed Chamber Heads gains 1/2 a point on compression ratio, over stock open chambers.
302 heads are like 65cc
9.2:1 stock 318 short block
.5 302 closed chamber heads
.1 thin head gaskets
_______
9.8 : 1 cr
Reman heads were milled .010 ths for clean up, so you can figure that in there too.
3 angle valve job, with new valves so the valves are standing up high too.
Port Matching heads to intake gasket required too.
I don't claim to be a full blown machinist.
So this is what we got for now.
Just to keep it simple we call it a 9.5:1 cr.
9.2:1 cr stock 318 with flat top pistons
.040 ths down in the hole.
(1968-69 stock 318 valve relief pistons).
Factory 230 hp engine
9.2:1 cr Stock 1991 318 Roller Engine
Factory 230 hp
Flat top pistons with no valve reliefs.
Same .040 ths down in the hole, so these will give a bit more compression than the 68-69 valve relief pistons.
Mr. Gasket Head Gaskets 1121G
.028 ths compressed thickness.
vs Felpro .035 ths head gaskets.
302 Closed Chamber Heads gains 1/2 a point on compression ratio, over stock open chambers.
302 heads are like 65cc
9.2:1 stock 318 short block
.5 302 closed chamber heads
.1 thin head gaskets
_______
9.8 : 1 cr
Reman heads were milled .010 ths for clean up, so you can figure that in there too.
3 angle valve job, with new valves so the valves are standing up high too.
Port Matching heads to intake gasket required too.
I don't claim to be a full blown machinist.
So this is what we got for now.
Just to keep it simple we call it a 9.5:1 cr.