Use the Explorer motor those GT40P heads are nice heads and it will work just fine. Why do you think all the older mustang guys grab these motors to drop into there 95 and older Stangs??

 

Hey Conanski, I'm in the middle of this swap right now (putting a '97 exploder 5.0 in my '90 full-size bronco 5.0). I have the '97 engine all dressed with the 90 parts, all the way down to the oil pan (since I wasn't sure the exploder pan would integrate with my bronco front axle setup, etc.). Anyway, I started to install the distributor last night and discovered the plug wire switcheroo issue you described. That seems simple enough, but I then started worrying about the injector firing sequence. Best I can tell, they're batch-fired (1,4,5,8) and (2,3,6,7), which means that if 3 and 7 aren't swapped with 5 and 4 it seems to me there would theoretically be a mis-timed firing sequence on 4 of the injectors. So my question is: If several folks have made this swap, is the injector mis-fire just no biggie (maybe a slightly lumpy idle or maybe no noticeable difference at all), or did the folks who made this swap also swap the injector wires on these 4 injectors? Hopefully this question makes sense . . .

Thanks,

Mica

 

You don't need to worry about the injector firing order. On Ford trucks of this vintage the injectors are wired exactly the same way for both the 5.0 and 5.8 motors.. which have different firing orders of course, so in the end it doesn't impact engine operation.

 

will the gt40p heads an ex. manifolds work on a 351 as a drop in swap with sd ?

 

Pretty sure the thru holes for the head bolts will have to be reamed out to accomodate the bigger head bolts in the 5.8

 

think these heads will help hp/tq much ?

 

Im planning on putting the same heads on my 5.0 when i get home from Iraq they are sitting in my shop floor now. With a cam(the biggest limitation in a stock set up) yes. From what Conanski has told me it will aslo bump my compression up about a half number not sure on the 5.8 though. But yes with a cam free flowing exhaust and heads you should feel a noticeable difference. And with the cam he recommended it will still run on speed density

 

i'm not doing cam yet, but may go for 1.7 rr. I have a blown head gasket, an financially not ready for a rebuild yet, but jy heads with a little machine work wont kill me

 

If you put a new top end (especially with a smaller combustion chamber on it) on and old bottom end its not going to be very kind to your bottom end. If it were mine i would fix the head gasket and start accumulating parts and storing them for a rebuild. Its a little easier on the wallet that way. You miss say 100 bucks a month vs 1500 all at once its a little more economical to buy them as you get a little extra money or in my situation any how.

 

i'm puttin the $$ together for the rebuild, its not gonna be cheap, i'm pretty much copyin someone else rebuild in nloc, 375 hp/ 510 tq

 

Yea sounds like dollars signs with the numbers mentioned good luck

 

i could probably save 1k w/o a forged rotating assy, but if i ever wanted to add a turbo, i wont have to rebuild a second time. I like some of the numbers lightning guys are makin with turbos, but i dont know if its practical for a gas hauler/DD

 

One additional note here. I should have said.. "it doesn't impact the batch fired SD system". This would have an impact on a sequential MAF vehicle if for example you swapped in a motor with the older firing order.. then those 4 injectors would have to be swapped around, but that's a pretty rare case and it doesn't apply here.

 

Yes they will work with an SD 351, and it'll make a bit more power but it's more of a message than an upgrade because the stock cam falls sooo far short of utilizing the motors potential.

 

the cams are like that in the 460's too