Head porting article.
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Team Owner
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From: SE NY
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Head porting article.
FYI: the May, 2002 issue of CHP has a nice article on head porting by a novice with expert guidance.
It may have some tips/encouragement for those who are thinking about it but not done one yet.
It may have some tips/encouragement for those who are thinking about it but not done one yet.
Safety Car
Joined: Jun 1999
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From: Austin, Singapore, Kuala Lumpur, Houston, Dallas, Hong Kong, Elgin, etc.. Texas
Re: Head porting article. (65Z01)
I have the article and its pretty good.
I pulled my LT4 heads and started to port them myself but quickly concluded that it was worth the money to have someone who know what they are doing.
You should have an expert do the 3-angle valve job and it turned out not to be that much more for a shop to do the whole thing. You may want to call around your area.
I pulled my LT4 heads and started to port them myself but quickly concluded that it was worth the money to have someone who know what they are doing.
You should have an expert do the 3-angle valve job and it turned out not to be that much more for a shop to do the whole thing. You may want to call around your area.
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Team Owner
Joined: Dec 2000
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From: SE NY
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Re: Head porting article. (Mez)
Maybe a CNC shop would be more reasonable than in the article. Of course I would want em flow benched after I ported them to assure all flowed in the ball park. Plus I would just like to do that job; it sounds like fun and very rewarding (I like doing my own work where possible). But I will check out pricing when it's time.
Safety Car
Joined: Jun 1999
Posts: 3,570
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From: Austin, Singapore, Kuala Lumpur, Houston, Dallas, Hong Kong, Elgin, etc.. Texas
Re: Head porting article. (65Z01)
Check out my web site
http://temp.corvetteforum.net/c4/tmezger/
for the story regarding my head porting experience. I am extremely happy with my choice.
http://temp.corvetteforum.net/c4/tmezger/
for the story regarding my head porting experience. I am extremely happy with my choice.
Thread Starter
Team Owner
Joined: Dec 2000
Posts: 90,675
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From: SE NY
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Re: Head porting article. (Mez)
Nice set of pics on the porting job.
BTW, what was the A/F ratio at WOT on those dyno pulls? Looks like it started out at 14.7:1 and dropped into the low 12s.
BTW, what was the A/F ratio at WOT on those dyno pulls? Looks like it started out at 14.7:1 and dropped into the low 12s.
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Melting Slicks
Joined: Aug 2001
Posts: 2,516
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From: Lockport NY
Re: Head porting article. (65Z01)
FYI: the May, 2002 issue of CHP has a nice article on head porting by a novice with expert guidance.
If you want more diagrams, cutaways showing metal to be removed...
...Or need GM part #s for older HP parts; get a copy of "How To Hotrod Small-Block Chevys" by Fisher & Waar; HP books, 1976.
It's out of print, but Amazon has them in the Used section...
I've had a copy of this book since the late '70's; loaned it out, never got it back...Ordered a "used" one from Amazon last Sept; it came in in "brand-new" (unopened!) condition, at half-price...(~$9.00)...Soft-cover...
It's old; but the head (and all the articles) specs still apply...
Safety Car
Joined: Jun 1999
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From: Austin, Singapore, Kuala Lumpur, Houston, Dallas, Hong Kong, Elgin, etc.. Texas
Re: Head porting article. (65Z01)
The AFR on my dyno runs were better after porting. It takes a second or two after WOT for the AFR to change at the meter.
The were low 12.3 - 12.5 before and 12.6 - 12.8 after. The Dyno shop said you want it to be about 12.6-12.8 for max power. By the way, the computer has not been reprogramed and has the stock exhaust system.
This car runs very smooth and hard from the stock 725 rpm idle right up up to 6400 rpm fuel shut off. I highly recommend having having your heads ported if you want to keep the stock cam and stock exhaust.
The were low 12.3 - 12.5 before and 12.6 - 12.8 after. The Dyno shop said you want it to be about 12.6-12.8 for max power. By the way, the computer has not been reprogramed and has the stock exhaust system.
This car runs very smooth and hard from the stock 725 rpm idle right up up to 6400 rpm fuel shut off. I highly recommend having having your heads ported if you want to keep the stock cam and stock exhaust.
