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Topic: Looking for bolt size

in Forum: C3 Engines

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Looking for bolt size (1/7)
4/10/12 8:20pm

tinbender
Former Member
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edgwood, MD - USA

Vette(s):
1975 convertible,with the hard top and power streering.it a 350 L48 with auto trans. the color is light blue.

Joined: 11/1/2007
Posts: 736

I'm changing the hold down on my valve covers from studs back to bolts....my question is what is what size bolts are used with the black finned alumnimum covers.(1/4-20 x?)

Rick

|UPDATED|4/10/2012 5:20:26 PM (AZT)|/UPDATED|

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Re: Looking for bolt size (2/7)
4/10/12 9:32pm

danascar
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Germansville, PA - USA

Vette(s):
1974 Coupe 358ci 4 speed Black w/Medium Saddle interior w/79 custom leather seats. . 1999 C5 Convertible, 6 speed, Atomic orange, Oak interior.

Joined: 1/28/2010
Posts: 858

Yup...1/4-20 if older style heads...center bolt heads????.

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DanT

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Re: Looking for bolt size (3/7)
4/10/12 9:35pm

Jaws79

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Sykesville, MD - USA

Vette(s):
1979 Corvette Coupe Corvette Light Blue Midnight Blue interior Mirrored Glass T-tops

Joined: 4/27/2008
Posts: 4238

I think Rick wants the length, Dan! I'm not sure of that! Sorry, Rick!

Barry

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Re: Looking for bolt size (4/7)
4/10/12 9:51pm

You are right as usual Barry...didn't read past the 1/4-20.... Wacko

|UPDATED|4/10/2012 6:51:05 PM (AZT)|/UPDATED|

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DanT

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Re: Looking for bolt size (5/7)
4/11/12 6:08am

Jeffm
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Sebago Lake, ME - USA

Vette(s):
1978 Silver Anniversary L82 4spd (M21) Red Leather. Pace Car is in the hands of a new caretaker.

Joined: 2/15/2007
Posts: 964

Found one I replaced. Measures 1" from below the head. Some of the suppliers sell the corect replacements for the finned aluminum covers.

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Re: Looking for bolt size (6/7)
4/11/12 8:40am

Sorry about that.....yep Barry I'm looking for the length,I don know if they are 1/4-20x1 or 1/4-20x1-1/4

Rick

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Re: Looking for bolt size (7/7)
4/11/12 12:37pm

Adams' Apple

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Duncanville, TX - USA

Vette(s):
#1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas

Joined: 11/8/2003
Posts: 20129

Ya gotta figure in the thickness of the gaskets, too. There are some out there that are about twice as thick as originals...most aftermarket gaskets seem to be a little thicker. So, if you happen to have the cast covers with thick gaskets, the 1 1/4" will prolly be correct.

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