Quote:
Originally Posted by 78w72
i have read that the 1.65 are closer to 1.7 or 1.72... but this is the first ive heard that the 1.5s are really a full 1.6. i have the HS 1.5s too & have been considering going to 1.65 for a little extra lift & duration on my E- head 467 with OF cam.
anyone else heard of this or can confirm it?
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Oh yes... years ago running circle track we had a rule for max lift at the valve. On paper my total lift was within spec, but when checked by officials after a feature win, my advertised 1.55 rockers were closer to 1.6xx and put me over the limit. You almost need to check with a dial indicator or work with a known source to have an exact number.
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68 Firebird-- Street/Strip - 400/461 Eagle Forged Bottom End & Ross Flat top pistons. KRE 325 CFM D port, Ultradyne 263/271 @.050, .4267 lift. Crower Solid roller lifters and 1.65 stainless rockers. Quickfuel 1000 on Torker2 intake and 2" open spacer. Hedman 1.75" headers. TH400 w/brake. Ford 9" w/3.80 gears & 28x9 Hoosier pro bracket drag radial. Best ET: 1.35 60ft, 6.29 @ 107.20 mph, 9.99 @132.33 mph. 3,300 race weight
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