Advice on new cylinder heads.

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Advice on new cylinder heads. Empty Advice on new cylinder heads.

Post  78ranger on August 14th 2019, 10:27 pm

Thinking about a head upgrade. Currently running ported big valve doves in a 521. Been driving it a couple years and wouldn't mind a bit more hp. Guess first question is any idea what I could get out of a head and probably cam change. Cam currently is about 247 at. 050 615 lift. Looking at the afr heads. Seem like good bang for the buck. Have 30 cc dish pistons in it now. What kind of lift could I run without valve reliefs, or do I need to cut some regardless. Appreciate any insight and feedback. Thanks.

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Post  stanger68 on August 16th 2019, 10:39 pm

Edited. Wrong post. My bad

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Post  dfree383 on August 17th 2019, 8:05 am

Check out the TFS street line, their are a several bolt on options that will not require a piston swap.
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Post  78ranger on August 19th 2019, 7:22 pm

Thanks. Looking at their heads looks like the 290 or 325 would keep my compression close to the same. Exhaust valves on both are 1.76. Intake on the 290 is 2.20. The 325 is 2.25. Don't know which ones would work or be best for my application. Four wheel drive truck that mud races a few times a year. Lots of wheeling and street time. Any ideas on how much more up I could make with better heads and as much more cam as I can run while keeping it steerable.

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Post  rmcomprandy on August 19th 2019, 9:30 pm

78ranger wrote:Thanks. Looking at their heads looks like the 290 or 325 would keep my compression close to the same. Exhaust valves on both are 1.76. Intake on the 290 is 2.20. The 325 is 2.25. Don't know which ones would work or be best for my application. Four wheel drive truck that mud races a few times a year. Lots of wheeling and street time. Any ideas on how much more up I could make with better heads and as much more cam as I can run while keeping it steerable.

The 325's are CNC ported, the 290's have ports as cast.

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Post  78ranger on August 19th 2019, 11:05 pm

Saw that. Would rather do the 325 unless I'm going to run into valve clearance issues.

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