whats the diff. in 2bbl heads and 4bbl heads 351w - Off-Road Forums & Discussion Groups
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post #1 of (permalink) Old 08-14-2005, 08:33 AM Thread Starter
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whats the diff. in 2bbl heads and 4bbl heads 351w

when comparing heads from engines w/ 2bbl carb vs 4bbl carb are the accual heads differnt or are the valve components/cam in the head different or both. im just wondering how a 4bbl carb and intake on an engine that had a 2bbl will perform
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post #2 of (permalink) Old 08-14-2005, 03:14 PM
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Re: whats the diff. in 2bbl heads and 4bbl heads 3

There is NO difference in the winsor 351 heads between 2bbl & 4bbl carbed motors. Early 351Ws had bigger exhaust valves however with a head diameter of 1.530 vs. 1.460 on later models (the same as 302s)...

Cleveland 351 heads had big differences between 2 & 4 bbl castings.
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