Porting and polishing the Heads
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Posting Guru
Joined: Mar 2007
Posts: 1,425
Likes: 9
Porting and polishing the Heads
Hey has anyone tried or heard of anyone that's taken a set of these heads and done the porting,polishing,angle cutting the valves etc, for a performance mod in conjunction with the turbos injectors and such. I'm asking because I came across a set heads for free. I'm thinking of picking these heads up and doing this to them. Any advice on this would be great. I'm not going to perform the work myself. I will take them to A head/performance shop for the rebuild.Thanks in advance.
Country
Country
Last edited by countrycar; May 5, 2007 at 11:13 PM.
Post Fiend
Joined: Jul 2005
Posts: 14,582
Likes: 12
From: 21791
Dockboy has made 758hp with stock manifolds, stock up pipes, and stock porting. If i were to do a port job, it would be more of a "polish" job, clean up casting defects and make the EXHAUST ports as clean as possible. Not much you can do with intake. I have a test dummy head that i was porting as well. The stock exhaust port is 1.5", and i had one port opened up to 1.85" and it made the area between the exhaust manifold flange that is outside of the valve cover very very thin, not what i wanted. Leave the porting generally the same, just touch it up.
Senior User
Joined: Sep 2006
Posts: 351
Likes: 1
From: In the Georgia Pines
i dont know about porting and polishing the heads, but i do know that the big hp/torque engines have head studs and cylinder fire O-rings installed on them. i dont think that a 7.3 would pull enough rpm's to see any real benefit of a full on port and polish job. it would be interesting to see what the results would be.
hope this helps
-mike
hope this helps
-mike
Elder User
Joined: Oct 2004
Posts: 855
Likes: 5
I have heard of headers, in very rare and wildy modified engines, but hohnestly have not heard of anyone doing anything more than polishing the stock stuff, if that. Biggest flow improvement is in the intake and the exhaust. Turbo swaps are next. Also, like mjlewis said, by the time you get that far, it is time for head studs and o-rings.
Junior User
Joined: Jun 2003
Posts: 66
Likes: 0
From: CR, IA
A simple clean up job helps. For a race engine, look for some additional flow with some seat work.
Mine flow 20% more air than stock, and boost dropped 4 psi.
Dockboy did 758 with a 1.04 correction, still 700 plus actual. If you are going to spray loads of NOS, no need to port anything.
Mine flow 20% more air than stock, and boost dropped 4 psi.
Dockboy did 758 with a 1.04 correction, still 700 plus actual. If you are going to spray loads of NOS, no need to port anything.
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Post Fiend
Joined: Jul 2005
Posts: 14,582
Likes: 12
From: 21791
I talked to Kevin the other day on the phone, and he said he was at the dynos all day. Just curious what Black Widow ran, if you even did. Fuel only of couse, the only way to go. 
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