Firepower354
Famous Member
Since you have a generic "HEI" the myriad of GM weights, springs, vacuum advance pieces.
GM HEI center plates & weights - mechanical advance | Chevy Nova Forum (stevesnovasite.com) etc
crn-210g2.pdf (summitracing.com)
Plotting the whole curve is a good plan. I usually use GM weights and a Mr Gasket advance kit, one soft, one medium.
And, the cheapest boost-retard that I know of is the 5-pin module from an early 80's unit. It takes 10 degrees of timing out when the 5th pin is grounded* Some other modules require voltage. Either way, a cheap 3-5 PSI, normally open pressure switch completes it.
More Information for STANDARD MOTOR PRODUCTS LX331 (rockauto.com)
GM HEI center plates & weights - mechanical advance | Chevy Nova Forum (stevesnovasite.com) etc
crn-210g2.pdf (summitracing.com)
Plotting the whole curve is a good plan. I usually use GM weights and a Mr Gasket advance kit, one soft, one medium.
And, the cheapest boost-retard that I know of is the 5-pin module from an early 80's unit. It takes 10 degrees of timing out when the 5th pin is grounded* Some other modules require voltage. Either way, a cheap 3-5 PSI, normally open pressure switch completes it.
More Information for STANDARD MOTOR PRODUCTS LX331 (rockauto.com)