351 Gt40 build? HELP
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351 Gt40 build? HELP
okay, so here's my dilema. i blew a head gasket on my 91 f350 and cracked the driver side head. its got the 5.8 windsor motor. i've always upgraded any part that breaks on any of my trucks with something better than what it came with from the factory. SO............ i bought a set of GT40 heads that came off an explorer and some lightning stainless factory headers, and my plans are to ditch my old E7 heads, bolt on the rebuilt GT40's, discard all the EGR/Smog crap, and put the factory 5.8 truck intake manifold back on it.
my question is, will this setup bolt together and work fine? i've heard horror stories about the intake not matching the ports in the head, and speed density not knowing what to do with itself after the swap.
has anyone done this before me, or know whether it'll work when i get it back together.
would appreciate the help!
Mike
my question is, will this setup bolt together and work fine? i've heard horror stories about the intake not matching the ports in the head, and speed density not knowing what to do with itself after the swap.
has anyone done this before me, or know whether it'll work when i get it back together.
would appreciate the help!
Mike
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From: Edmonton, Alberta
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they're the 3 bar heads, not GT40P's. they don't have the thermactor ports on the back side of the heads, and my old EGR valve leaked anyways, so i was just planning to ditch all emmisions. i bought a resister from RJM injection tech. it plugs right into where the EGR valve would be and fools the computer into thinking the EGR is still there and is closed. EGR delete seemed to work well on another 351 truck i built a few years ago. the more useless junk i take off of that motor means the less parts there are to break in the future. i was just curious if anyone had tried to use GT40 heads on a 5.8 with the factory intake manifold.
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Yes they'll work with the factory intake manifold though you'll notice that the port exists in the lower intake are noticably smaller than the ports in the heads so the intake remains as the primary bottleneck on the engine.
EGR eliminator works for some but not others, the computer will still set a code when it sees that the valve is not responding to it's commands and that may turn on the light eventually.
EGR eliminator works for some but not others, the computer will still set a code when it sees that the valve is not responding to it's commands and that may turn on the light eventually.
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You'll have to drill out the head bolt holes for the 5.8's 1/2" bolts, the 5.0's are 7/16". I didn't know any Explorers came with the GT40's with straight plugs, I thought they were all p's. I wish I had found a set, the plugs on the p's can be a real PITA!
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