5/16 hood bolts

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Dec 11, 2017 | 04:12 PM

anesthes

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Posts: 12,102

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From: SALEM, NH

Car: '88 Formula

Engine: LC9

Transmission: 4L60E

Axle/Gears: 3.89 9"

5/16 hood bolts

So my fiberglass hood is tapped for 5/16 bolts. The holes in the hinges are only 6mm which is basically 1/4".

I think 5/16" is too big even for a helicoil. Any suggestions other than trying to bore the slots in the hinges larger?

-- Joe

Dec 11, 2017 | 06:53 PM

articwhiteZ

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Joined: Sep 2009

Posts: 3,776

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From: Spokane WA

Car: 92 Lingenfelter Z28 articwhite

Engine: Aluminum 615BBC

Transmission: Th400wbrake/curri entps9" locker

Axle/Gears: 4.11/4.30/4.56

Re: 5/16 hood bolts

Mine also...open up the holes.. (Glastek hood)
I had to open up mine. and slot them. to get the hood on the way I wanted..
the pic below shows them (the holes) then chromed after fitting...(just below this..you can see the holes open/sloted)

the fit was 100% to my liking after opening & slotting..

Last edited by articwhiteZ; Dec 11, 2017 at 07:00 PM.

Dec 11, 2017 | 11:49 PM

NoEmissions84TA

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From: Meriden, CT 06451

Car: 84 TA orig. 305 LG4 "H" E4ME

Engine: 334 SBC - stroked 305 M4ME Q-Jet

Transmission: upgraded 700R4 3200 stall

Axle/Gears: 10bolt 4.10 Posi w Lakewood TA Bars

Re: 5/16 hood bolts

Fabricate adapter studs - 5/16" hood thread on one end, and 1/4" or 6 mm on the other. You might even be able to buy them.
Similar to this: https://www.summitracing.com/parts/r...yABEgJ9J_D_BwE
and this: https://www.newport.com/f/thread-adaptors

M8 to M6 is easy to find. The threads in your hood might be 5/16, but M8 might be close enough to thread in.

Last edited by NoEmissions84TA; Dec 12, 2017 at 12:38 AM.