So what do the High ports flow out of the box?
With your compression you should only need to achieve 330 cfm @28” to make 700 hp.
If it where me I would use epoxy to gradually neck down the runners in your manifold that.100” sonner then open up the intake runner at the head flange.
It’s much easier to sand out the epoxy if you ever need/ want to reuse that intake then weld up the heads.
Expansions in runner area need to be gradual so as to not narrow down the upper part of the motors power band.
The opposite side of the coin in terms of having a wide power band holds true also, that being that within the whole intake tract there should be only one point of minimum port area.
__________________
Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs!
And he was not talking about 1/8 or 1/4 mile ETs!
1) 1940s 100% silver 4 cup tea server set.
Two dry rotted 14 x 10 Micky Thompson slicks.
1) un-mailed in gift coupon from a 1972 box of corn flakes.
Two pairs of brown leather flip flops, never seen more then 2 mph.
Education is what your left with once you forget things!
Last edited by steve25; 03-21-2026 at 12:32 PM.
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