Patriot stage 3 heads on ls1
#4
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I've seen of a few older threads, people saying the larger valves might be to large for the stock LS1 bore ? I haven't seen anything yet with someone saying they've worked well on a std bore LS1.
#5
This, real patriot stg 3 heads have made real good power on bigger motors. I can't find them now but another company was selling a patriot stg3 head with the same valve sizes and I believe same flow sheet as patriot performance. They were using new cheap castings from over seas and I never saw anything good from them. I believe it was pro max maybe that had the heads but not positive on that. If they are patriot performance heads they will still have gm casting numbers on the.
#6
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Get the most flow from the smallest valve for the application.
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Perhaps having a local shop flow them for you to determine how much power they could make.
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GM valve seats are usually run with 2”,2.02”,&2.04” but most head guys will change out the seats to fit a 2.08” So ultimately you’re at the mercy of the quality of that process and subsequent valve job/chamber Un-shrouding
Perhaps having a local shop flow them for you to determine how much power they could make.
Perhaps having a local shop flow them for you to determine how much power they could make.
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I think after hearing what's been said, I'll pass on these heads. For not much more money I can pick something up that's proven. I'm not looking for anything crazy, just a decent improvement over my stock 241 heads.
#17
Did some more digging. Kinda looks like patriot performance switched to Promaxx, then again to RPM outlet. Also looks like they are using factory castings now, I'm 99 percent positive they were using Chinese casting when it was Promaxx patriot stg 3. But here they are. https://www.rpmoutlet.com/gtomclutch.htm
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