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68post · 02-18-2014, 08:22 PM

With the proper piston to deck height you'll have closer to 11.7 - 1 compression , a 76cc chamber would be perfect with flattops.
The 850 holley isn't a good street carb for anything smaller than a 454 , and not great then either .
A Holley 780/750 vacuum carb or a 750 or 800 tuned-up Qjet (first choice), even an 800dp or an 830dp holley carbs will be more responsive. Better yet the Demon high-end carbs are better than all but the very newest and best Holleys.

What is the cam's .050 duration ?

02-18-2014, 08:22 PM	#46
68post Registered User Join Date: Jan 2014 Location: Indpls. , IN Posts: 797	Re: 400/406 Builds With the proper piston to deck height you'll have closer to 11.7 - 1 compression , a 76cc chamber would be perfect with flattops. The 850 holley isn't a good street carb for anything smaller than a 454 , and not great then either . A Holley 780/750 vacuum carb or a 750 or 800 tuned-up Qjet (first choice), even an 800dp or an 830dp holley carbs will be more responsive. Better yet the Demon high-end carbs are better than all but the very newest and best Holleys. What is the cam's .050 duration ? Last edited by 68post; 02-18-2014 at 08:27 PM.