302 questions
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Mountain Pass
Joined: Aug 2002
Posts: 151
Likes: 0
From: Edmonton, Ab. Canada
302 questions
My truck has a 302 in it right now that I've never heard running. I did a compression test on it and found an average of 110psi in all the working clyinders. 1 had a stuck exhaust valve and 1 had a stuck intake (they bent the pushrods) I got new pushrods gaskets etc.. While I had the heads off I pocket ported them I didn't match the ports to the intake because it's the stock 2 Barrel and I want an alum. 4 barrel. The valves were lapped and seemed to seal better.
I have 2 questions.
1) when I get the heads, intake and everything put together.. what's a reasonable psi to not rebuild the motor ( I know they should all be within 10%)
2) I also (after putting on my heads) got a set of stock iron heads off a 79 302. the valves have alot more meat to them and stick out of the seats more than mine, also the ports are atleast 125% larger than mine, they also have stud mounted rocker arms (mine have pedestal)
would these heads be a better choice? were they made differently then?
(any other parts off the 79 I should be looking for?)
thanks you.
Ryan
1981 Bronco 302 auto no mods.
I have 2 questions.
1) when I get the heads, intake and everything put together.. what's a reasonable psi to not rebuild the motor ( I know they should all be within 10%)
2) I also (after putting on my heads) got a set of stock iron heads off a 79 302. the valves have alot more meat to them and stick out of the seats more than mine, also the ports are atleast 125% larger than mine, they also have stud mounted rocker arms (mine have pedestal)
would these heads be a better choice? were they made differently then?
(any other parts off the 79 I should be looking for?)
thanks you.
Ryan
1981 Bronco 302 auto no mods.
Senior User
Joined: Jan 2002
Posts: 314
Likes: 0
302 questions
Are you sure your extra heads are 302's. I think they went to fulcrum rockers in ,77. With the larger ports that you describe they might be early 351W heads. What is the casting # and what do the water holes look like on the intake manifold side. The valves sitting nice and high is a good indication they haven't been subjected a valve job.
Thread Starter
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Mountain Pass
Joined: Aug 2002
Posts: 151
Likes: 0
From: Edmonton, Ab. Canada
302 questions
I took a better look at them and they were big block heads the intake screws into it at an angle (not stright down)
The TONKA Project Continues...
1981 Bronco 302 Gutted, Fenders cut, Custom bumbers coming, (spray in) Box Liner inside and out, Roll-bar etc
The TONKA Project Continues...
1981 Bronco 302 Gutted, Fenders cut, Custom bumbers coming, (spray in) Box Liner inside and out, Roll-bar etc
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