Intake compatability
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New User
Joined: Sep 2007
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I'm doing a EFI conversion on a PCM 351w for a boat. I'm going to put a GT40 lower intake on it off of another GT40 marinized engine. I'm on a budget and don't want to cough up the $ for a 5.8 upper for the conversion.
FTE Legend
Joined: Jun 2006
Posts: 31,930
Likes: 1,499
From: Ottawa, Ontario
OK.. the GT40 intakes are good for over 300hp if the motor under it can flow that well. There were no 5.0 or 5.8 uppers BTW, there is only a GT40 upper, so in other words, both motors use the same upper with the appropriate lower. You'll want to measure the ports in the lower where it meets the heads and open these up to match the heads.. if necessary and there is sufficient material to work with.
FTE Legend
Joined: Jun 2006
Posts: 31,930
Likes: 1,499
From: Ottawa, Ontario
Internally the GT40 and Explorer intakes are identical, the only difference is one is built from tubing and the other is an aluminum casting. The GT40 intake is definitely the sexier of the two, though.
