98 stock ported heads

03-22-2002, 03:59 PM

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 ?

Hammer · 03-22-2002, 07:42 PM

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...

esandes · 03-23-2002, 05:02 PM

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.

03-22-2002, 03:59 PM	#1
southernstang97 Guest Posts: n/a	98 stock ported heads 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 ?

03-22-2002, 07:42 PM	#2
Hammer AKA "Dr. Evil" Join Date: Feb 1999 Location: South Fork Ranch Posts: 1,721	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... __________________ Uncle Sam "What the hell is up with all the gauges? Calling Captain Kirk, your ride awaits... Phasers on stun...."

03-23-2002, 05:02 PM	#3
esandes Registered Member Join Date: Mar 2002 Posts: 72	About 25 HP 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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