Intakes interchange??
Lead Driver
Joined: Feb 2003
Posts: 8,140
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From: Oak Harbor, OH
The 302's upper has rectangular ports, and the 351 has oval. You have two choices, use them without matching, or at least hog out enough to make the 302 gasket NOT look like its too big. You could get a 351w upper, but that would be pointless as the 302's flows so much better (or at least they say so on here).
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New User
Joined: Sep 2006
Posts: 24
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So the ports on the lower intake on the 351 will need to be matched to the ports on the upper of the 302?? I am really just looking for it to run decently until I have enough money to get an edelbrock upper and lower.
Lead Driver
Joined: Feb 2003
Posts: 8,140
Likes: 4
From: Oak Harbor, OH
It will run with the 302 upper, but if you have a die grinder and aren't afraid to gasket match the lower chances are it'll flow better than the edelbrock. The stock units were pretty good. The mustang upper with just a throttle body change will support about 400hp IIRC.
Lead Driver
Joined: Feb 2003
Posts: 8,140
Likes: 4
From: Oak Harbor, OH
It might, it might not. I don't remember, I do know that the factory intakes are pretty good though. My 351 in my van had 30lb/hr injectors, and made good power on a stock upper. It had a larger TB.
Senior User
Joined: Jun 2004
Posts: 205
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From: Florida
Correct me if Im wrong, but why not just swap the lower as well so that they match up? Will the 351W lower fit on a 302 and vise versa?
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No you can't put a 302 intake on a 5.8, the block is wider.
Also don't bother trying to gasket match a 5.8 lower to a 5.0 upper. The 5.0 runners are rectangular versus the oval 5.8 runners. and there isn't enough aluminum in the 351 lower to do this correctly. Besides you would have to open up the whole length of each runner to make it work, not just the area near the gasket surface.
Also don't bother trying to gasket match a 5.8 lower to a 5.0 upper. The 5.0 runners are rectangular versus the oval 5.8 runners. and there isn't enough aluminum in the 351 lower to do this correctly. Besides you would have to open up the whole length of each runner to make it work, not just the area near the gasket surface.
