Thoughts on accepted aftermarket heads for 350?

Bobby Lundholm · 02-22-2018, 12:10 PM

Quote:

Originally Posted by Mark Ugrich

So if I’m understanding this correctly , you must run the aluminum/ replacement heads in either stock or super stock using the runners as they come from the manufacturer. The exception being replacing the valves and seats with the correct OEM sizes?

That's what I'm understanding. The air flow is going to be restricted by the intake regardless, so with the larger head runners i don't think it'll help that much.

FireSale · 02-22-2018, 12:45 PM

Quote:

Originally Posted by Bobby Lundholm

That's what I'm understanding. The air flow is going to be restricted by the intake regardless, so with the larger head runners i don't think it'll help that much.

That's what I was told regarding my AFRs. Smaller valves would degrade the heads performance. The shop that does work for Hancock and Lane advised against that route.

X-TECH MAN · 02-22-2018, 12:59 PM

Quote:

Originally Posted by Bobby Lundholm

That's what I'm understanding. The air flow is going to be restricted by the intake regardless, so with the larger head runners i don't think it'll help that much.

I know of at least one stocker 428 CJ intake manifold that is 10 lbs lighter in wt. than any others. No grinding on the outside either !

Bobby Lundholm · 02-22-2018, 01:10 PM

Quote:

Originally Posted by X-TECH MAN

I know of at least one stocker 428 CJ intake manifold that is 10 lbs lighter in wt. than any others. No grinding on the outside either !

I still don't think you make the intakes big enough to really let the heads breathe. What's the standard CC of the stock Chevy intakes compared to a 185 cc head runner?