cylinder heads

avery370z · 11-26-2014, 06:18 PM

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?

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.

synolimit · 11-26-2014, 10:14 PM

Just port by hand then and pay or not pay for the valve job. V8 guys have been doing it for years by hand.

Eclipz · 11-26-2014, 10:19 PM

Where are you getting the head work done? same place where you got the manifolds done?

avery370z · 11-27-2014, 11:54 AM

Yeah I know I'm one of those V8 guys but I've had some success with extrude honing. If I'm gonna do it I might as well go all the way. And yes I'm using the same place in California there service and quality are superb. Just wish they still made the Jun exhaust cams now that would be badass!!!!

avery370z · 12-09-2014, 06:11 PM

Do you have to drop the motor to take the heads off? Ive gotten mixed answers. Some say dont drop the motor and some say it comes out without motor removal.

1slow370 · 12-09-2014, 06:23 PM

THEY HARDLY NEED IT!! don't listen to syno the heads flow so damn much it's pointless. It won't hurt unless you are oversizing the ports and then you will lose low end velocity. Your money is better spent in other places.

Edit: just for reference the factory heads build power past 9,000 rpm with different exhaust cams, and they outflow the nismo de race heads by a wide margin.

11-26-2014, 06:18 PM	#1 (permalink)
avery370z Base Member Join Date: Mar 2014 Location: Fort Worth,Texas Posts: 153 Drives: 2014 370z w/ Sp Pkg Rep Power: 11	cylinder heads 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?

11-26-2014, 10:14 PM	#4 (permalink)
synolimit A True Z Fanatic Join Date: May 2013 Location: Columbus, OH Posts: 5,051 Drives: 2013 Silver 370z Rep Power: 3388	Just port by hand then and pay or not pay for the valve job. V8 guys have been doing it for years by hand. __________________ 13 370z-

12-09-2014, 06:23 PM	#8 (permalink)
1slow370 A True Z Fanatic Join Date: Aug 2009 Location: In the D Posts: 3,732 Drives: v8 74 260z ;) Rep Power: 7250	THEY HARDLY NEED IT!! don't listen to syno the heads flow so damn much it's pointless. It won't hurt unless you are oversizing the ports and then you will lose low end velocity. Your money is better spent in other places. Edit: just for reference the factory heads build power past 9,000 rpm with different exhaust cams, and they outflow the nismo de race heads by a wide margin. TerribleONE, SPOHN, 2011 Nismo#91 and 2 others like this. __________________ ANSWER PRICE LIST Answers - - - - - - - - - - - - - - - - $0.75 Answers (requiring thought) - - - - $1.25 Answers (correct) - - - - - - - - - - $12.50

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11-26-2014, 08:49 PM	#3 (permalink)
avery370z Base Member Join Date: Mar 2014 Location: Fort Worth,Texas Posts: 153 Drives: 2014 370z w/ Sp Pkg Rep Power: 11	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.

11-26-2014, 10:19 PM	#5 (permalink)
Eclipz Enthusiast Member Join Date: Dec 2013 Location: Tampa Posts: 360 Drives: 06 Eclipse GS Rep Power: 11	Where are you getting the head work done? same place where you got the manifolds done?

11-27-2014, 11:54 AM	#6 (permalink)
avery370z Base Member Join Date: Mar 2014 Location: Fort Worth,Texas Posts: 153 Drives: 2014 370z w/ Sp Pkg Rep Power: 11	Yeah I know I'm one of those V8 guys but I've had some success with extrude honing. If I'm gonna do it I might as well go all the way. And yes I'm using the same place in California there service and quality are superb. Just wish they still made the Jun exhaust cams now that would be badass!!!!

12-09-2014, 06:11 PM	#7 (permalink)
avery370z Base Member Join Date: Mar 2014 Location: Fort Worth,Texas Posts: 153 Drives: 2014 370z w/ Sp Pkg Rep Power: 11	Do you have to drop the motor to take the heads off? Ive gotten mixed answers. Some say dont drop the motor and some say it comes out without motor removal.