The last set of fully ported iron D port heads I did for a 400 motor flowed 280 cfm and the motor made 580 hp and I could have got them to flow more but the heads had previously been ported and material was taken out that I needed to allow them to top the 280 cfm level.
If you start off with a vergin set of D ports and someone who knows how to port them up right ( there are some 6 or 7 people in the country that can do that) then with your motors CID, as I said 600 hp can be had.
In a motor like yours I would also not run a roller Cam as a solid lifter Cam can Crank the valves open faster ad add that last 5 to 10 hp that will give you the needed reserve edge in power!
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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; 10-16-2020 at 12:33 PM.
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