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Old 01-12-2011, 11:40 PM
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454 heads patriot 320cc

Hello,


I've been looking around at cyl heads. I see that the patriot 320s are VERY close to the AFR265 and in some low lift spots flow better (5 - 9 cfm). They're rectangle ports but they still have AWESOME low lift flow #s. They run 1400 bucks a pair assembled.

They flow very close to the AFRs so they shouldn't be too big for a 454 right? They're cheaper and with a 119cc chamber puts me at 9.2:1 CR 0" deck .039" gasket.

Not too fond of the chinese part but I've heard alot of good stuff about them. I'll be running XR288HR cam 9.2:1 CR and 90 octane gas.

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Old 01-13-2011, 03:44 PM
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Well news flash there is a big differance between AFR's and patiots trust me and i dont mean just price, id never buy a set of patriots there complete junk!
AFR's on the other hand are a great head, but id personally run a Pro-Filer head they make some great power and trust me its not all about flow numbers its about great air velocity and getting that air flowing down low in the rpm range aswell as up top.

I just puchased a set of profilers for my SB considered afrs but they have over inflated flowed numbers aswell and the patriots are just pore quailty through out just google them you'll see plenty of posts n them.
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Old 01-13-2011, 05:19 PM
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A 320 runner rectangle port head, no matter who markets it..will not work out with the low compression and that cam. Air flow port velocity is where its at on a street motor. Go to anyones 290 oval port head and you will be impressed..
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Old 01-13-2011, 05:35 PM
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off and on something makes me wonder about my good old 781 oval port heads, and i start looking around.
this is one of those post that made me look around.
here is what i found today, some good reading in the link at the bottom of the page.
http://www.maliburacing.com/ovalvsrect.htm
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Old 01-14-2011, 09:09 AM
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i have built one 454 with that Patriot head. The heads could have used some touch up work around the seats but the basic machine work was very good. I did not flow test them. The engine was dynoed and used a 235@.050 Lunati hyd roller, 10:1 compression, RPM intake and 850 carb and made about 500hp and 550tq. Torque peak was about 4400 and hp peak at 5000 with over 500tq from 2300 up. For the money and on a street machine, that seems OK, but overall i was not impressed.
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