Trying for 10.5:1 w/ a head that'll flow 260+cfm. I'm trying to stay away from a thin head gasket. Considering there will be a 300 shot going on it. Afr would be my first choice if they sold a head w/ a 64cc chamber. Should I just bit the bullet and get the heads milled for 150+ or would I see better results from decking the bock to 0.000?

Any ideas on other heads would greatly be appreciated.

 

I seen advertisements for ProLine or lightening heads or whatever you call them. But the flow numbers they list are all at .700" lift. WTF?!?! 90% of the people out there won't reach that lift on a street car. Any other suggestions?

 

Free,

If you study the flow numbers at other lift ranges for the Pro heads, you'll find that they are pretty impressive. The midrange flows are very respectable as well, not just peak flow at 0.700".

 

On this level of a motor build up you should optimize the quench clearance between the block and head deck with the gasket installed. Right around .040" total is good. Decking the block to achieve this will also raise the compression ratio too.

By doing this first then adjusting the combustion chamber cc
with head milling you'll have a better motor.
It's all in the details.

 

I understand the optimal quench is around .040. But decking the block will cost aound 150-200 and then if I get a 68cc head I'll still have to shell out another 150 (4cc~.025-.030) for the milling. I was planning on pay alot for parts but not for machine work. Is that my only option at this point? Go w/ the Pro lines and zero the deck?

 

what you really want to do is shoot for the optimum quinch area, but as a rule i like zero decked blocks and thicker coated head gaskets. milling heads opens up a lot more areas to problems, like intake not sealing and thiner gasket surfaces.

 

I believe AFR heads can be ordered already milled to 64cc's
from the factory. Just have to specify that when ordering.
The decks on both these heads are real thick. Milling .030" off or so is not going to cause much of a problem in strength or alignment. My 305 heads were shaved .070" at least
and the block has some .030" cut off it and all I needed to do was shave the bottom of the intake off a bit by hand to get a good
fit. because the heads were ported with a raised roof to 1206 size
manifold port alignment was right on without touching the intake.

Don't short change the machining. Not worth it.

It's only money..... You'll get more

 

LMAO. Thanks for the reminder.

Well AFR charges 250 for milling. ANY kind of milling. I've been looking into the Proline heads a lot more. They offer a 64cc head. And the money that I save on the price, milling, and upgrading the springs on the AFR's I could pay for a decent port job to get the Prolines to out flow the AFRs. And the fact that AFR is 5-7 WEEKS behind schedule. The prolines aren't as bad w/ only a 2 week waiting period. The best part is that I can bolt them on and go.

(after checking piston to valve clearence of course)