Houtan
Member
Hi everyone,
I have a question about vacuum advanced on 455 stage 1 engines, In 1974 455 Stage 1 vacuum advanced was 10 degrees, non stage 1 engines was 18 degrees. I overhauled the engine and changed compression ratio higher, also get rid of 1974 emission parts and used street strip camshaft with 112 degree lobe separation, my distributor is original 1974 HEI stage 1 with original vacuum advanced 10 degrees on it. my question is it is better to stick with original 10 degrees vacuum advanced or I must going for higher degrees 18 or maybe 20?
Cheers.
I have a question about vacuum advanced on 455 stage 1 engines, In 1974 455 Stage 1 vacuum advanced was 10 degrees, non stage 1 engines was 18 degrees. I overhauled the engine and changed compression ratio higher, also get rid of 1974 emission parts and used street strip camshaft with 112 degree lobe separation, my distributor is original 1974 HEI stage 1 with original vacuum advanced 10 degrees on it. my question is it is better to stick with original 10 degrees vacuum advanced or I must going for higher degrees 18 or maybe 20?
Cheers.