340 street build with timing questions

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Old 06-14-2018, 03:55 PM
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340 street build with timing questions

What is reccorecomm base timing with a 472 lift, 260 duration and 11:1 comp, thunder series 650 Edelbrock carb and a vacuum advance Mopar distributor?
im getting back break up under heavy load, throttle, at 2500 to 3600 then it Roars.
Old 06-15-2018, 07:02 PM
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With todays fuels I would start with about 15deg btdc vacuum advance disconnected See how it runs. You may need to modify the distributor
Old 06-16-2018, 03:55 AM
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Problem solved.

Pinned the vacuum advance and set base at 12 btdc.
trans has manual vavle body and was starting in second gear.
Car hauls ***, gets sideways in second, good idle and street characteristics.
Total advance about 34-36, no hesitation and good plug reading, no detonation.
Thanks for your replies!
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