I have an 86 f150 with a 5.0. It was stock fuel injected but has been changed over to carb. I am in need of a valve job so I had a question about heads. I have a set of E7 heads from a 1995 that I want to have gone through and prepared so I can just do a swap instead of pulling stock heads off and getting them redone. Will the heads I have work on my motor. I know it is a flat tappet motor. This is my daily driver and I do not care too much about performance.

 

Should work just fine. The newer heads are probably better heads anyways.

 

Agreed. The stock heads were just about as bad as it got, so the E7's should be better. The only thing to check is if they are the same combustion chamber size. I think the stock ones should have 69-70 cc chambers.

 

Stock D8 style heads are 69 CC. The newer heads are 64 CC from what I looked up.

 

Yes. But the ones I've cc'd came out at 70. And going to 64's will bump the compression quite a bit.

 

I noticed there's a couple CC variance from head set to head set sometimes.

I don't see a problem with that guy running more compression with the EFI. As the newer engines ran them with EFI.

 

I agree, and as long as he isn't changing the pistons he will be fine. I ran a compression ratio check and if he's running 70 cc heads at 8.0:1 compression ratio he will be running 8.5:1 with 64 cc heads.

 

I thought the 70 CC heads were 8.4:1 compression with stock pistons?

 

Possibly. My point was that the change will raise the compression by 1/2 point.

 

Thanks everyone for the help

 

Any time!