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04-02-2010, 08:44 PM
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Senior Member
Join Date: Jul 2009
Location: goose creek sc
Posts: 818
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ported heads technical question
has anyone installed ported heads, especially ones with oversized valves, noticed a decrease in engine vacuum at idle? if yes how much? thanks
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  02 lightning all stock 99 mustang gt Tork Tech terminator kit making a little boost |
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04-02-2010, 08:47 PM
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Neo is Jesus
Join Date: Jan 2007
Posts: 13,265
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Where more aggressive cams used also?
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04-02-2010, 10:16 PM
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#3 |
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Senior Member
Join Date: Jul 2009
Location: goose creek sc
Posts: 818
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well, i had stage 2 patriot performance heads and i upgraded to stage 3 heads with larger valves and more porting. i used the same cams in both but i have lost about 8 in of vacuum. i do have a more efficient intake manifold also with a slightly larger supercharger. i upgraded from an m90 to an m112. the low vacuum is giving me a rough idle. i suspect the heads are at least helping with the loss.
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02 lightning all stock 99 mustang gt Tork Tech terminator kit making a little boost |
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04-03-2010, 09:23 AM
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#4 |
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Senior Member
Join Date: Jul 2009
Location: goose creek sc
Posts: 818
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they are cms (vt) stage 2 blower cams so the are a little aggressive
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