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#1 |
Guest
Posts: n/a
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![]() i would like to know if any body out there has ever had a set of 1998 factory heads ported/polished ? And if so what kind of gains did you get from them ?
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#2 |
AKA "Dr. Evil"
Join Date: Feb 1999
Location: South Fork Ranch
Posts: 1,721
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![]() I've got a pair of stock ones somewhere in the depths of my garage.... but they're not ported....
To be honest, I'd save for the 99 up PI heads...
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Uncle Sam "What the hell is up with all the gauges? Calling Captain Kirk, your ride awaits... Phasers on stun...." |
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#3 |
Registered Member
Join Date: Mar 2002
Posts: 72
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![]() There is an article in the January '99 issue of 5.0 about exactly this. It says the HP gain is about 25. The intake flowed 250 cfm @ .45" of valve lift, for a 20% improvement and the exhaust flowed 158 cfm @ .45" of valve lift-12% improvement. The HP gain there was 25. If you use a blower, the gains are more over stock heads. As you can tell, the 99+ heads are superior to the "98-"heads.
The article didn't note how much the porting and new valves cost. If you need more info just let me know. |
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