Hey guys, looking for some recommendations on my build.
I currently have a 92 f150 302 4wd that i want to swap in a 93 351.

I currently have the 351 on the stand and nearly tore down.
What can i do to this thing to improve performance?

 

There is a current thread covering your questions a little further down the list. Tons of good info.

 

I'd number on the 93 bronco block.
Can anyone tell me more about it?

 

If its the thread I think it is, he's running a carb, I'm wanting to stay efi.

 

Not to sound rude, but I would reccomend doing a search on the forum in this section. This question gets asked at least 2-3x a month.

You can do headers, exhaust and a mild EFI friendly cam. That's about it.

 

I have been, did so much last night my brain started to hurt.

My main concern is how much I can shave the heads and bore the cylinders if it hasn't be done already.

Searching last night I got confused on speed density, some say you can't run a bigger cam and some say you can, so I wanted to ask because not getting a straight answer, and a lot of threads are older.

 

No, this one: https://www.ford-trucks.com/forums/1...et-minded.html

Still an EFI build. I believe there are more photos and info in the Performance forum. Found it: https://www.ford-trucks.com/forums/1...questions.html

While this is a build using a roller cam the same guidelines still apply for a flat tappet cam.

 

You don't want a "big cam" in a truck anyway. It'll pull hard mid range but it'll always have to crack a downshift to keep it moving at cruise. The speed density cams are actually very good for a truck application, and when combined with good flowing heads, are actually quite potent from idle to 5k.

 

Thanks for these links, I'll look into them.

 

Are the gt40 heads the only option for better flow, or can I improve the stock heads any?

 

Just put a cam(crane 444232) and full exhaust on it, that is guaranteed to work with the stock EFI system while delivering some gains you can feel.

 

Not quite, the only stock cams I'd recommend keeping for mild applications are the F4TE('94+ roller) or the old 351HO flat tappet, everything else is junk.

 

Oh, you should know that I'm not recommending any stock speed density cams

 

What's the difference between the two stock cams and the comp cam you installed?

 

These all have enough lift and duration to allow half decent airflow with stock heads.. which are a bit small for this displacement.