No it’s not, but it does add more friction due to the added spring pressure which can negate any added power that might be had and with the added lift of the other cam I would not chance running stock well used valves .
7K3
Stock flow numbers@28”
Intake —————exh
.050”——39..5
.100”——75.8—-50.2
.200”——135.3——95
.300”——177.5——128
.400”——198.8——148.4
.450”——203.7——152.9
.500”——206——161
.550”——208.4——163
.600”——209.8—-166.4
.650”——————-168.2
.retest with 2” tube
.650”——————————-184.6
Running .500” lift should get you to 415 hp easy.
__________________
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; 01-31-2026 at 03:19 PM.
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