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Mar 15, 2004 | 05:46 PM

DT 466Man

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Joined: Jul 2003

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From: Adams TN

Heads

What is the hole in the back of the head that has a tube bolting to it and the two from the different heads meet in the intake? The Heads are E5's
I am replacing them with GT40P form a 96 Explorer
The motor is an 87 HO 351w

The holes look like they are for Coolent or something like that
Can i block them off?
Do the Gt40p's Have them

Mar 15, 2004 | 07:41 PM

RTM

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From: Sunny Florida

The hole I think you are refering to is for the EGR system or for the air to be pumped in the back of the heads and I believe the GT-40P heads should have this as well and yes you can buy the plugs for this hole at the dealership.

Mar 16, 2004 | 04:56 PM

DT 466Man

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From: Adams TN

what would the change in compression be if say i have the stock
8.5:1 if i put the GT-40p's on inplace of the E5's?
what is the combustion chambes size on the Gt's

Mar 16, 2004 | 08:49 PM

RTM

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From: Sunny Florida

That one I don't know off hand but I bet there wouldn't be much of a change.

Mar 17, 2004 | 12:48 AM

bigwheelin

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Joined: Aug 2003

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Between 1/2 and 3/4 of a point. The GT40P has a 60 cc chamber and the E5 I think have a 69 cc chamber.

FYI: if you didn't already know you will have to have the head bolt holes drilled on the GT40P's to fit the Windsors 9/16 head bolts.