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 Post subject: Headwork?
PostPosted: Fri Aug 10, 2007 10:24 pm 
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3 Deuce Weber

Joined: Sun Dec 10, 2006 3:08 pm
Posts: 53
Location: InlandEmpire
Car Model:
I read alot of advice about headwork being a big factor in waking the slant up, I just took my head off the other day, what all should I have done to it and how is it going to help?

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 Post subject:
PostPosted: Sat Aug 11, 2007 12:47 am 
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EFI Slant 6

Joined: Thu Sep 14, 2006 7:54 pm
Posts: 347
Car Model:
There are some do it yourself articles here, just do a search. I did some bowl blending on mine, did not increase the port size at all. Matched the intake runner openings to the intake ports on the head. The point is to allow the fuel mixture to enter with less obstruction, so more can get in. More air in means more air out, so a bigger exhaust will help. The majority here seems to go to a 2 1/4 to 2 1/5 inch diameter. What carb/intake do you have?

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 Post subject:
PostPosted: Sat Aug 11, 2007 5:24 am 
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Turbo EFI
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Joined: Wed Feb 23, 2005 1:50 pm
Posts: 2353
Location: Pertneer Nashville TN
Car Model:
My head has been gasket matched and had minor bowl work by me. My first attempt. Polishing the chambers was easy and fun. After my head went to the machine shop it was disassembled by a friend and he really worked it well. My carbides wouldn't reach way down in there. I was shocked at how much was removed from the bowls etc.

I ran out of time trying to find out what oversize valves to add. I had to take a trip to Florida and I also ran out of money.

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93 D350 160HP Cummins Auto :-( Dually Clubcab needs a injector pump
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 Post subject:
PostPosted: Sat Aug 11, 2007 7:08 pm 
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Supercharged
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Joined: Sat Nov 27, 2004 8:03 pm
Posts: 10038
Location: IRWIN PA
Car Model:
If you are Going for any performance gains the Head is the Place to start.

Do some major Porting and Polishing And put in the biggest valves you can fit.

Even with a Stock cam and a 2 BBl it will make a huge Difference!!


On my race Motor I picked up 2 Seconds in the Quater by just porting / Polishing and adding Oversize Valves.


Greg

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