03-08-2008, 07:19 PM
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CC Member
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Join Date: May 2006
Location: St. Louisville,
Oh
Cobra Make, Engine: A&C 67 427 cobra SB
Posts: 2,445
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Not Ranked
My 347 pulls strong to 6500 with hydraulic rollers. Not sure what the springs are.
A 4.6 modular can turn 10,000 with hydraulic lifters. I know the overhead cam is apples to grapefruit, but there is a point to be made. To get to those rpms they use 0-5W oil to keep the lifters from pumping up. My experiance, back when I was a puppy, with a 383 Mopar (with hemi valve springs) was that it would turn 7000+ with 10-40W, but with 50W the valves would float around 6700. My point is that springs and valve train weight are very important, but so is the oil. I even suspect some of the very high oil pressure that I read of the FE engines could also negatively impact hydraulic lifter. |
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