806 heads vs 862 heads
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Teching In
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806 heads vs 862 heads I'm having a dilemma about what heads I should run on my car the setup is a tsunami cam and a Holley sniper long runner intake with a 102 tb, I'm worried that the 862 will kill power cause the small intake valve, but will the small chamber of the 862 compensate for the power or should I just put the 806 heads on it.
Stock to stock it's gonna be close. The 862 head will obviously bump compression, but the 806 head will flow slightly better. I would think with that intake and cam you have the increased compression would be more suitable than the very slight increase flow of the 806 head
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I see. If it were me i'd have those 862's worked over. I have PRC 5.3 heads (862 casting) and for the money I think they do really well. Either way since the heads are not on the car you might as well have them ported. That's just my opinion
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well if you have the heads off now is the time to upgrade or improve them such as valves, larger or aftermarket, porting ,valve job . If your leaving stock because of budget .maybe porting isn't in the budget, at least a valve job and milling. 806 would not be my first choice but if your ok with perimeter bolt , go for it. Id probably go with 862 but with a port and slight larger valve.
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well if you have the heads off now is the time to upgrade or improve them such as valves, larger or aftermarket, porting ,valve job . If your leaving stock because of budget .maybe porting isn't in the budget, at least a valve job and milling. 806 would not be my first choice but if your ok with perimeter bolt , go for it. Id probably go with 862 but with a port and slight larger valve.
TECH Resident
Joined: Apr 2010
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From: Central Texas
The 2" intake valve is okay, but not sure why you would want to go down in size on the exhaust side . 862 casting already has 1.55 exhaust. 806 casting is perimeter bolt and different coils and brackets. Go with the 862 a good valve job ,bowl blend and maybe valve upgrade combo 1.95 in and 1.57 ex
TECH Resident
Joined: Apr 2010
Posts: 926
Likes: 18
From: Central Texas
The 2" intake valve is okay, but not sure why you would want to go down in size on the exhaust side . 862 casting already has 1.55 exhaust. 806 casting is perimeter bolt and different coils and brackets. Go with the 862 a good valve job ,bowl blend and maybe valve upgrade combo 1.95 in and 1.57 ex