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Re: HEI convert c-60
Have you tried to pick up the vacuum off of the intake manifold? It would not be ported vacuum, but it would let you know if something else is wrong.
The Hei in my '77 6500 GMC with 427 does not have vacuum advance.
Danny
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'67 Chevy C-20 short stepper - build complete, 454/SM-465.
'75 C-30 Single Cab DRW-350 small block/NP-435.
'77 GMC-6500 Dump Truck, 427 Tall Deck.
'92 GMC K-3500 Duallie, 454/4L80E.
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