i was wondering if gt40 heads off of a 5.0 , would work on my 5.8?

 

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.

 

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.

 

but they dont need to be rechambered or anything like that? how much power would i gain?

 

no just drill out head bolt holes, maybe 20hp

 

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

 

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.

 

well what cam do you recomend Conanski?

 

What year is your truck/motor?

 

I remember reading that article. LOL. While it is true IMO that diesels are easier to mod for your every day pick up truck, they should have modded the 351 properly. Stock cams suck...

 

96 f-250, i may just do a cam if i will see more performance