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  #1 (permalink)  
Old 04-06-2005, 04:51 PM
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Cobra Make, Engine: (building) - Hunter #74 w/ 302 small block (320hp under the hood). . . how many wires are there in a wiring harness?
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Default '87 302ci heads . . . Need Help!

What size are the holes for the bolts that hold on the exhaust on the heads?

Seems to be metric thread, want to be sure, someone......

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Old 04-06-2005, 05:53 PM
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They should be 3/8 x 16.

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Old 04-06-2005, 07:07 PM
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3/8 x 16 only went in about 1 or 2 threads before they stopped turning.

Tried a couple different holes but the same result.

Do not have any metric on hand to try.......

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Old 04-06-2005, 07:15 PM
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See if a 3/8 NC tap will go in without a lot of effort. Maybe there is corrosion in the threads.

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Old 04-06-2005, 07:25 PM
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Default head bolts

I believe a 7/16 diameter head bolts on late 302's and 1/2 diameter bolts on 351 heads. I think you will need a busshing for the 7/16 bolts. I got mine from ARP.

later Dennis
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Old 04-07-2005, 02:34 PM
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A 3/8" course tap seems to go thru with "pressure" on it....

Can these threaded holes get "warped" some how?
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Old 04-12-2005, 05:35 AM
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most likely corrosion from the bolts that were in there before.
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