Bolt Size Question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**lks dcvn** · 07-23-2008, 11:12 AM

I will be running to TSC at lunch today and forgot to grab the spare bolts I had to bring with me...to get the right sizes...

Can anybody tell me the size of the following bolts:

Fuel Line Clip Bolts on Frame Rails
Trans Line Clip Bolts on Frame Rails
SBC Engine Tower Bolts (to attach towers to frame)
Bolts that connect to accessory holes in heads to connect engine hoist to.

Thanks in advance.

**Classic Heartbeat** · 07-23-2008, 11:31 AM

I believe:
Fuel Line Clip Bolts on Frame Rails = 1/4" X 1 1/2 coarse thread 7/1/6" head
Trans Line Clip Bolts on Frame Rails = 1/4" X 1 1/2 coarse thread 7/1/6" head
SBC Engine Tower Bolts (to attach towers to frame) = 3/8" X 1 1/2" Coarse thread (9/16" head)
Bolts that connect to accessory holes in heads to connect engine hoist to. = 3/8 X 2" Coarse thread 9/16" head

WES

**lks dcvn** · 07-23-2008, 11:59 AM

Thanks Wes for the quick response - heading there now!

That worked out pretty well!

chris71 · 07-23-2008, 12:08 PM

now i may be wrong here but it seems like 1 1/2 bolts may be a bit long, i feel like you could use 1 inch or 3/4 in long bolts for the fuel/transline clips and the towers, maybe use the 3/4 for the clips and the 1 in for the towers just to be safe, for some reason i had a feeling that the clip bolts may have been 5/16's in diameter, maybe someone will chime in and prove me wrong, 1/4 in bolts would make more sense to me though.

**Classic Heartbeat** · 07-23-2008, 12:12 PM

Shorter bolts may be sufficiant, but if they work loose as many do the nuts will thread themselves off. I always like to have 1/4" sticking out of the bolt. They are that way from the factory. WES

07-23-2008, 11:12 AM	#1
lks dcvn Registered User Join Date: Jan 2007 Location: Columbus, Ohio Posts: 4,348	Bolt Size Question I will be running to TSC at lunch today and forgot to grab the spare bolts I had to bring with me...to get the right sizes... Can anybody tell me the size of the following bolts: Fuel Line Clip Bolts on Frame Rails Trans Line Clip Bolts on Frame Rails SBC Engine Tower Bolts (to attach towers to frame) Bolts that connect to accessory holes in heads to connect engine hoist to. Thanks in advance.

07-23-2008, 11:31 AM	#2
Classic Heartbeat Project Junkie! Fishing Poor!! Join Date: Dec 1999 Location: Olympia,Wa. 98512 Posts: 10,766	Re: Bolt Size Question I believe: Fuel Line Clip Bolts on Frame Rails = 1/4" X 1 1/2 coarse thread 7/1/6" head Trans Line Clip Bolts on Frame Rails = 1/4" X 1 1/2 coarse thread 7/1/6" head SBC Engine Tower Bolts (to attach towers to frame) = 3/8" X 1 1/2" Coarse thread (9/16" head) Bolts that connect to accessory holes in heads to connect engine hoist to. = 3/8 X 2" Coarse thread 9/16" head WES __________________ On-line catolog Classic Heartbeat Pickup Parts WEHEPP@comcast.net Call us Toll Free (888) 338-2502 Like Us on Facebook No appointment necessary. 72 BB Chevy Custom Deluxe / Custom Camper 67 I-6 (Soon to be 5.7 LS1) Panel 68 BB Chevy Short Bed 72 6.0 LQ9 Short Bed Chevy 4X4 Olympia's fastest growing truck parts supplier. Olympia's home for Wayward Chevys

07-23-2008, 11:59 AM	#3
lks dcvn Registered User Join Date: Jan 2007 Location: Columbus, Ohio Posts: 4,348	Re: Bolt Size Question Thanks Wes for the quick response - heading there now! That worked out pretty well!

07-23-2008, 12:08 PM	#4
chris71 Registered User Join Date: Oct 2007 Location: Sykesville MD Posts: 357	Re: Bolt Size Question now i may be wrong here but it seems like 1 1/2 bolts may be a bit long, i feel like you could use 1 inch or 3/4 in long bolts for the fuel/transline clips and the towers, maybe use the 3/4 for the clips and the 1 in for the towers just to be safe, for some reason i had a feeling that the clip bolts may have been 5/16's in diameter, maybe someone will chime in and prove me wrong, 1/4 in bolts would make more sense to me though. __________________ '55 3100 2nd series short-bed stepside '70 Corvette coupe stingray '71 Chevelle 2-dr coupe SS clone '71 C10 long-bed fleetside '83 long-haired brunette wife

07-23-2008, 12:12 PM	#5
Classic Heartbeat Project Junkie! Fishing Poor!! Join Date: Dec 1999 Location: Olympia,Wa. 98512 Posts: 10,766	Re: Bolt Size Question Shorter bolts may be sufficiant, but if they work loose as many do the nuts will thread themselves off. I always like to have 1/4" sticking out of the bolt. They are that way from the factory. WES __________________ On-line catolog Classic Heartbeat Pickup Parts WEHEPP@comcast.net Call us Toll Free (888) 338-2502 Like Us on Facebook No appointment necessary. 72 BB Chevy Custom Deluxe / Custom Camper 67 I-6 (Soon to be 5.7 LS1) Panel 68 BB Chevy Short Bed 72 6.0 LQ9 Short Bed Chevy 4X4 Olympia's fastest growing truck parts supplier. Olympia's home for Wayward Chevys



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