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Discussion Starter · #1 ·
I just switched from c14 to q16.I was told to back timing off 3 to 4 degrees and jet up 5 to 6.Ive got a 620 naturally aspirated w/ a holley 1250.w/ c14 i run 38 degrees timing.any suggestions.ron p.
 

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Discussion Starter · #3 ·
No not yet. I made 5 runs and checked plugs.I was going to watch my mph also.mph was down 2 from 150 to 148.The track was real hot and greasy.not good for testing.ron p.
 
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