304 Performance - Off-Road Forums & Discussion Groups
IH Scout & Trucks Discussion of International Harvester, 4-Wheel Drive Truck and Scout Vehicles

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post #1 of (permalink) Old 12-10-1999, 09:10 PM
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304 Performance

I have a decent running 304 with the T-19 tranny. I have added 36" Buckshots and would know like to tap the 304 for a little more power and RPM range. I would like to hear from anybody that has done this succesfully or otherwise. Any information on valve springs, cams, porting and polishing, head milling, 4 barrel intakes, headers, ANYTHING would be greatly appreciated. I want to build the perfect 304 IH. Also I have found a scout with a motor in a u-pull-it that would be a great head donor, but dont know how to tell if its a 304.

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post #2 of (permalink) Old 12-11-1999, 12:41 AM
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Re: 304 Performance

You want to talk with John Comer at Gryphin Racing. From what I have read he builds the hotest IH 304s around. Check the vendor list. If he is not listed here check The Binder Bulletin (www.binderbulletin.org). I can tell you that IHC didn't make a 4B intake for the 304 but there is an aftermarket one from Giddum'Up Scout in Colorado Springs. It too should be in the vendor list. The manifold is pricy. Quite a number of guys that frequent the binderbulletin run 304s. There is a really good FAQ section and a how to build it on 304s too. I'm a 345 man myself although I hope I get a 392 for xmas. BTW, Stan's Headers makes a 4-tube and a Tri-y for the 304,345,392 series. Also check out http://members.aol.com/twmart for cam specs for 5 or 6 brands. Hope this helps. DougS ([email protected])

Doug S
post #3 of (permalink) Old 12-13-1999, 11:03 AM
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Re: 304 Performance

Why stay with the 304? Increased torque is what will help you move those big tires, and the best way to
boost torque is to move up to at least a 345, preferably a 392.


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