12/23/2023 0 Comments Delco vacuum pump in big cam 350![]() ![]() What spring combo from the curve kit would get me X-degrees base, 25 degrees total at X-RPM? What RPM would I want to reach total timing?ģ. ![]() ![]() To get 25 total, what base timing would I want it set at?Ģ. Truck is an 86 K20, 4-speed, 4.10 gears.mainly stays under 55mph and will probably rarely see over 4500RPM.My questions are these:ġ. Everyone who runs them says they run BEST with the total timing set around 25 degrees as apposed to the normal 32-36 range. ![]() Everything I've read on the heads says they're made for low end torque and fuel economy. I have a fairly mild 350 with Comp Extreme 4x4 cam (.447x.462 lift I think) Edelbrock performer intake, early 90's center bolt 191 "HD" truck casting heads, 650cfm Edelbrock carb, probably about 9-9.5:1 compression and an HEI distributor. So I have a fair understanding of setting the base timing and such, but I need help to REALLY Dial it all in.
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