question about GT40 heads
Senior User
Joined: Feb 2003
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From: Greenville, NC
I have a set on my 5.8 right now. You have to drill out the head bolt holes to 7/16", and the AIR hoses won't bolt to the back of the heads. I got mine more because they were available, and cost about the same as it was going to cost to redo my 5.8L head.
FTE Legend
Joined: Jun 2006
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From: Ottawa, Ontario
Actually you have to drill them out from 7/16" to 1/2"... which can be done on a common drill press, but after that yeah they bolt right on.
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Elder User
Joined: Apr 2012
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From: Munger
alright cool, i'm just trying to save up my pennys but i cant decide what to do to my truck but i think im going to pick up these heads, shorty headers, and possibly a tune, then later on a lift
FTE Legend
Joined: Jun 2006
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From: Ottawa, Ontario
Engine mods are a complete waste of time and money until the stock cam is changed. There is an old magazine article out there on the web somewhere comparing a 5.8 truck to a diesel and it tried to show how each motor responds to mods, but of course the article was in a Diesel mag so they wanted to highlight the oil burner. Anyway.. they put $3000 of Edelbrock parts(heads, intake, exhaust) on a 5.8 but didn't change the cam and only got 15hp or 20hp out of it, while I know from personal experience you get more than that with a $200 flat tappet cam in an all stock motor.
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Engine mods are a complete waste of time and money until the stock cam is changed. There is an old magazine article out there on the web somewhere comparing a 5.8 truck to a diesel and it tried to show how each motor responds to mods, but of course the article was in a Diesel mag so they wanted to highlight the oil burner. Anyway.. they put $3000 of Edelbrock parts(heads, intake, exhaust) on a 5.8 but didn't change the cam and only got 15hp or 20hp out of it, while I know from personal experience you get more than that with a $200 flat tappet cam in an all stock motor.
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