Bellhousing to Block Bolt Size/Length - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Howitzer · 02-21-2013, 06:52 PM

Anyone know the bolt size and length for the transmission bellhousing to block bolts (6 of them) for a 1972 402?

JimKshortstep4x4 · 02-21-2013, 08:43 PM

The factory bolts were 3/8-16 x 1 3/8 (not positive on the length).

Standard 1 1/2" long bolts will usually bottom out in the female threads so you may want to compensate with washers or cut them off if this happens.

Jim

02-21-2013, 06:52 PM	#1
Howitzer Registered User Join Date: Feb 2012 Location: Calgary, Alberta Posts: 135	Bellhousing to Block Bolt Size/Length Anyone know the bolt size and length for the transmission bellhousing to block bolts (6 of them) for a 1972 402?

02-21-2013, 08:43 PM	#2
JimKshortstep4x4 Senior Member Join Date: Jul 2001 Location: Muskegon,MI,USA Posts: 6,026	Re: Bellhousing to Block Bolt Size/Length The factory bolts were 3/8-16 x 1 3/8 (not positive on the length). Standard 1 1/2" long bolts will usually bottom out in the female threads so you may want to compensate with washers or cut them off if this happens. Jim __________________ 1971 Shortbox step side 4x4, 350 sbc, 3:07 rear end 1965 Impala SS 400 sbc, Muncie rock crusher 1966 Impala SS 396 bbc, TH 400 1969 El Camino, 350 sbc, TH 350 1971 Snowplow built on a Blazer frame 1972 GMC Short bed, stepside, TH 400, 427 BBC Last edited by JimKshortstep4x4; 02-21-2013 at 08:45 PM. Reason: Added wording

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