fbekholden.com

I have started making some extractors for the old girl and just wanted some opinions
I am using 1.5 inch primary pipes which is smaller than the exhaust ports on the heads (chev)
Should I ditch these pipes and go for the larger primaries or am I over thinking

Well I just spoke to the local engine builder and he reckons if Im not chasing big horse power it should be fine

That's crazy...not much point having pipes smaller than the ports.

It will lack performance and efficiency.

Have decided to go back to the log headers