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Bookmark or Share- Stall convertor? New cam? - Pontiac GTO Forum214/224. .440/.470. 112 LSA. The above numbers are from an old list so today's cams might be a little different, but basically the Summit cam is extremely close with a little more lift. Both of these cams are on the mild side and would work with a stock converter, but better with a little looser converter.
- Exhaust port shape? | Pontiac GTO ForumThe tight LSA hits hard and higher combustion pressures can trigger detonation and along with the rougher idle it might not be the best choice for a street cam. Now if I'm doing nothing but drag racing I'm probably going for a really tight LSA in the 106 to 108 range and my gearing and torque converter is going to make the most of the combination.
- 400 vs 455 Cam Comparison Numbers | Pontiac GTO ForumTo calculate the LSA of a cam you simply add the intake and exhaust Lobe Centerline figures together and divide the sum by two. Changes in Lobe Separation Angles changes the four opening and closing valve timing events of a camshaft. LSA is not the same as duration. You could have a 280 degree cam duration on a 110 LSA or 114 LSA. A narrower ...
- 73 455 Cam choice - Pontiac GTO ForumThe xe 262 or xe 268 is a good base set of numbers to look for in your cam choice. Also a narrow LSA makes more power, but at a narrower RPM range , where as the same grind with a wider LSA (higher number) makes power across a wider rpm range. My ( 389) 400 runs a CRANE cam with .454 in .480 ex lift 112 LSA (216in 228ex @.050).
- Pontiac 1971 350 Cam Upgrade - Looking For Input/OpinionsThe "066" is on a 111.5 LSA, and you have 116 - but that is for the exhaust valve Centerline. Intake is on a 107 Centerline, so add intake/exhaust Centerline and divide by 2 to give you the 111.5 LSA. This cam would be good for low compression. You can use your stock valve springs. Timing chains are based on opinions - we each have our preferences.
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