Quote:
Originally Posted by geeteeohguy
This is concerning. Your car is a street car. The only cars that run locked in timing with no vacuum advance that I know of are drag cars. If your initial timing is 27, be prepared to knock the nose off your starter and break flywheel teeth on a hot start if you have ignition connected.
ALL street driven cars should run vacuum advance for fuel economy, power, engine cooling, and overall performance.
How much and manifold or ported depends on what your engine wants.
Optimal timing can't be determined on a run-in stand. Your machinist is blowing smoke.
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He did not say his initial timing was 27 degrees.
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68 Firebird. IA2 block, 505 cu in, E-head, Solid roller 3650 weight. Reid TH400 4:11 gear. 29" slick.
Best so far 10.12@133 mph. 1.43 60 ft.
76 Trans am, TKX .81 o/d, 3.73 Moser rearend,
468 with KRE D-ports, Doug headers, 3" Exh.
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