I'm planning on rebuilding my 351w in my 91 F150 Lariat EFI. I'm also planning some up grades.

.040 over 351 with a zero decked block.
GT-40 heads
Crane 444232 Cam (.448/.464 Lift) (206/214 @ .050) (114 LSA)
Stock intake
1 5/8 Shorty headers

My question is will this setup work with the factory speed density EFI setup? Also, what timing chain should I get and where should I install it as far as cam/crank centerline? I would like to advance the cam to get some more toque out of it but I'm pretty sure it would freak the computer out.

 

That should work but there are no guarantees, there is a guy here with the same combo and he has had some problems with it. I have the same cam in my 5.8 but my truck is also mass air. Where are you getting that cam BTW.. Crane is long gone and any leftover supply has dried up.. or are they back in business again? If you do have one install it straight up.. the cam produces lots of TQ as it is and the GT40 heads will only improve that.

 

I'm assuming the issues the guy is having are drive ability issues or idle/stalling issues? I would like to avoid these and I'm now leaning towards a set of E7's with the exhaust ports opened a bit (bumps ground down) same cam and a set of headers. the cam seems to be available from summit racing. Last I heard S&S Cycle bought out the rest of crane re-opened it, I could be wrong though.

I am kinda on a tight budget so most mass-air swaps are kinda out of the question unless there is a computer out there out of a truck with a 5.8, mass air and an E4OD that I can change the pin-outs and install a mass-air and harness, I'm pretty sure I'd be a new injector harness too, correct?

Another idea I had was installing a first gen lightning computer, as it would already be calibrated for the GT-40 heads and shorty headers plus it has a better program for the trans.

My expertise lies in carbureted combos and I'm really just rambling and looking for someone more experienced in this speed density to offer advice and bounce ideas off of.

 

We never did find out exactly what was causing the problems with the other guys truck.. I believe he is now in the middle of a MAF conversion as nothing else has helped. But the motor did run well at one point and there have been others that have done similar mods with no major issues so who knows what happened there.
The E4OD in your truck does make things more complicated, a Lightning EEC would be a good idea if you could find one.. but if you do decide to try a MAF conversion you can use a 5.0 EEC with a matching MAF meter too, and you need the MAF and Injector wiring to add to your harness.
I had heard about S&S Cycles buying Crane about a year ago but have yet to see any anouncement that they were officially back in business, it would be great if they are because Crane had several really nice truck cams. I can say enough about the 444232 in the 5.8... my motor never ceased to amaze me at the TQ it generated, I'm dying to get it back together with the new heads and intake I have for it this 5.0 just isn't enough for a 5000lb truck.

 

Yeah, I thought I had read something about them being back in business but I may be wrong. This truck is used to tow my open trailer and race car so I'm just looking for more toque out of her, not building a race truck. I wonder if the pin-outs are the same for the Lightning (93-94) EEC as my 91.

 

will the non-gt40 intake line up with intake ports on the GT40P heads?

 

There is nothing unique about GT40 heads in terms of port location so the answer is yes.. any OEM or aftermarket 351/5.8 intake will bolt right on.

 

Thank you Paul...I was thinking they could be like the 7.5 efi problem (efi won't bolt on to non-efi heads due to intake port differences...Thanks again for straightening that out. I guess the only thing different on the Gt--40's is the exhaust manifollds?

 

No.. No difference on the exhaust side either.

 

I think your confusing the GT40 with the GT40P. The GT40P has different exhaust ports.

 

sp both the GT40's and the Gt40P take the factory intake manifold?
the GT40's take the regular exhaust manfold while the GT40P takes the unique exhaust manifold?
Why the big deal for the lighting intakes for 5.8...whAt is the advantage?

 

which pistons do I use with GT40 head for 5.8 application (block is a stock 1987 era flat tappet--non-roller)?

 

both heads accept the manifold of the engine theyre going on respectively. 302 fits 302 w/ gt40, 351 fits 351 w/ gt40 heads.


the 351 efi intake is a miserable display of intake design. its the lower that is the problem, its very short with sharp bends. the lightning intake is a taller piece...if youre lucky enough to find one, it'll be pricey. not really worth the cost, you can get some new aftermarket intakes for the cost of what people try to get for their 20 year old used pieces.

 

piston selection depends on what you want. if you want it to have max power and efficiency, get some pistons to increase your compression. that's also if you don't mind running 93 octane.