"Cliff. At what point would you want to start tightening up the LSA on a 455 past 112? At a glance it seems theres a general correlation between LSA and .050 duration on the older cam grinds."
At about 250 @ .050" it may help to start pulling the lobes in some, as you are raising the peak HP point past the capabilities of the shortblock and in many cases the head flow.
All of the 260 @ .050" (and larger) cams we've used in 455 have been on a 110LSA, but they have all been high compression "race" engines......Cliff
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73 Ventura, SOLD 455, 3740lbs, 11.30's at 120mph, 1977 Pontiac Q-jet, HO intake, HEI, 10" converter, 3.42 gears, DOT's, 7.20's at 96mph and still WAY under the roll bar rule. Best ET to date 7.18 at 97MPH (1/8th mile),
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