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New Edge Cobras
4v Head Comparison
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<blockquote data-quote="xblitzkriegx" data-source="post: 16404233" data-attributes="member: 105608"><p>The B heads would be great in a street engine if it were around 400ci. The ports are just way too big for a 4.6 and even a 5.4 if you're keeping it under 7500rpm.</p><p></p><p>I think the b head port volume is something like 235-230cc, I don't remember exactly. It's far greater than what a streetable small bore, small displacement engine needs. For comparison, a LS1 241 head has around 200cc port size and that engine is 65ci larger. It's not a direct comparison because it's 2v ohv vs 4v dohc but you can get an idea of port size vs engine size based on rpm. The LS1 is a far better match for a streetable engine and the b head would work great on the 4.6 at 9000rpm or with 30psi boost.</p></blockquote><p></p>
[QUOTE="xblitzkriegx, post: 16404233, member: 105608"] The B heads would be great in a street engine if it were around 400ci. The ports are just way too big for a 4.6 and even a 5.4 if you're keeping it under 7500rpm. I think the b head port volume is something like 235-230cc, I don't remember exactly. It's far greater than what a streetable small bore, small displacement engine needs. For comparison, a LS1 241 head has around 200cc port size and that engine is 65ci larger. It's not a direct comparison because it's 2v ohv vs 4v dohc but you can get an idea of port size vs engine size based on rpm. The LS1 is a far better match for a streetable engine and the b head would work great on the 4.6 at 9000rpm or with 30psi boost. [/QUOTE]
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