Come on Bill!
Where talking about factory iron heads here with a 1.66” valve , and yes I have seen a NA motor with a aftermarket head with a 1.600” valve top 1000 hp also!
Some facts here once again are needed to be gone over.
With just a custom 2.14” intake valve in a 68 and up iron head the chamber needs to be unshrouded ( especially if well ported ) and in a very special way to only remove the minimum amount of CCs if your not looking to have to mill the head a lot to get back to your starting compression ratio.
If you step up to a 2.20” valve then the CCs needed to be removed is even greater!
The valve bowl porting work for a 2.20” valve needs to be done in a way to guide a good chunk of the added flow out into the center of the bore, so you had better have a flow bench at your constant disposal to guide you in the right direction.
The great thing about doing all the porting and chamber work needed to start to take good advantage of stuffing a 2.20” valve into a iron head is that the flow numbers between the all important.200” to .400” lift can be made massive !
You could probably get by means of working on a mule head first to make mistakes on ,maybe 170 cfm @ 28”@ .200” and by .400” 255 cfm.
The large flow numbers like this at .200” would likely make for too large numbers down at .050” and .100” so a 30 degree seat would not be the way to go.
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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; 04-25-2021 at 07:13 AM.
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