512Stroker
We are all here because we are not all there.
What is the combustion chamber volume of a factory stock X head?
no mod's, 1969
no mod's, 1969
around 52 I believe. I picked up a pair with some work done very cheap. Took it to shop that did the work and he said something about 52
Mine were 69cc after 2 valve jobs and one new set of stainless factory tulip style valves.What is the combustion chamber volume of a factory stock X head?
no mod's, 1969
I have had one second from end be smaller than the restend to end can vary on the same head
especially if they have had unknown work in the past
gotta check
always more uncut than the FSM says
Set of 915 J , one was 64 while the others were 69.something -70cc Ground it some after scribing and opening the chambers to the bore size. They all needed a little touch up after the scribing to dial them perfect.That happens too and usually are different
after you get the head square then you have to open up a few chambers or all of them (if legal) if you want to be dead nuts on
no need to mention opening up the bowls DYI if the heads are off -makes a big difference especially if proceeded by a nice multi-angle valve job
that's why I mentioned flow cutting (or at least leveling out) turbulence with totally stock heads at sub .500 lifts even
me I'd go - (but good) now if going to better heads later where i would go custom for sure once I had my flows
do not scribe out to the gasket size the air does not like to hit the sharp edge of the top of the bore
of course you can chamfer the top of the bore but why unless you have a flowbench
ex is not as critical unless valve hits the top of the block
No one is scribing the gasket. What I'm talking about is marking the heads left and right ,assigning them to each Bank permanently. Put both the heads on w/bolts in to snug them up...flip it on the stand and scribe using the cylinder.do not scribe out to the gasket size the air does not like to hit the sharp edge of the top of the bore
of course you can chamfer the top of the bore but why unless you have a flowbench
ex is not as critical unless valve hits the top of the block