cylinder heads

synolimit · 11-26-2014, 06:54 PM

Quote:

Originally Posted by avery370z

Has anybody done any porting and polishing or extrude honing of there heads?Mine are in the process of getting started just wondering if anybody saw some gains?

They need it! Very rough and huge casting marks. When I installed my ported lower I could of ported at least a 1/16-1/8" more of the lower to match the heads. I believe in some nice gains as people have been doing it for years! While there off I'd do a 3 angle valve job and match the entire system. If you can pull the heads yourself it should be a very cheap power increase. I'd love to do it but the VVEL system scares the crap out of me.

avery370z · 11-26-2014, 08:49 PM

Yeah I'm pulling the heads off myself but cheap is not what it's going to be. It's 1000 bucks to Extrude Hone both heads and the 3 angle valve job and assembly is 700. But since I can't find anybody that's done it I'll be the test mule. Pray for some hp gains.

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11-26-2014, 08:49 PM	#2 (permalink)
avery370z Base Member Join Date: Mar 2014 Location: Fort Worth,Texas Posts: 153 Drives: 2014 370z w/ Sp Pkg Rep Power: 13	Yeah I'm pulling the heads off myself but cheap is not what it's going to be. It's 1000 bucks to Extrude Hone both heads and the 3 angle valve job and assembly is 700. But since I can't find anybody that's done it I'll be the test mule. Pray for some hp gains.