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- Degreeing a Cam - the process | Pontiac GTO Forum
That is, if the intake centerline is at 106, then the exhaust centerline will ALSO be at 106 (And the LSA itself will be 106 cam degrees) When someone says a cam has X amount of degrees of advance (or retard) ground in, what that really means is that the cam LSA is different from the recommended Intake CenterLine (ICL) It's a confusing term
- Aluminum Head Compression Estimate | Pontiac GTO Forum
A tighter LSA such as the 108° is more prone to detonation Not sure why the 66cc head purchase since the 74cc Kaufman heads would give some additional safety I doubt you want to replace pistons so a head purchase with slightly larger chambers would be a reasonable choice
- Compreesion ratio | Pontiac GTO Forum
Example, one with 106 LSA installed at 104 Intake Centerline (ICL) will have higher cylinder pressure than a 112 LSA installed at 110 ICL, presuming the same duration and static compression This is why a tighter LSA does not need more compression because it builds more cylinder pressure (and work well on low compression engine builds)
- What Cam should I use? | Pontiac GTO Forum
LSA 116 degrees More on LSA below As you can see, the difference in the cam is the durations, but the lift stays the same Now if we step up to the factory 1968 Ram Air I engine, still rated at 360 HP, it used the "744" cam Int 301 Ex 313 Lift 406" LSA 115 5 degrees
- Pontiac 428 build | Page 8 | Pontiac GTO Forum
As LSA increases the maximum peak power drops lower and if spread too much a noticeable performance drop could be experienced - but on the other hand duration can be increased and a balance maintained Pontiac used wider LSA's to maintain drivability at lower RPM's and keep things somewhat civilized
- 73 455 Cam choice - Pontiac GTO Forum
The 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)
- 2004-2006 GTO General Discussion - Pontiac GTO Forum
2004-2006 Pontiac GTO discussions When you purchase through links on our site, we may earn an affiliate commission, which supports our community
- Idle Rpm - Pontiac GTO Forum
I’m running a 462, with a moderate cam (236 242 at 050” 12 deg LSA) and th400 I set my total timing to 36 which results in my base at about 13 or 14 deg - my mech advance is about 22-24 degrees, and I use no vac advance I use a 2,400 converter so my idle rpm in neutral is about 750 rpm, drops slightly in drive at idle
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