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

68racer · 03-12-2005, 05:29 PM

I'm swapping to a later front suspension clip before the 502 goes in. Over the years I have been collecting parts. I now find the recon calipers have a 3/8 UNC thread for the hollow hose bolt. The hoses have a 7/16 hole in the end. The hollow bolts that came off the old clip are 7/16 UNF.

At what year did this thread change?
If I get 3/8 UNC bolts can I use the hoses with the 7/16 holes?
If not, what is the part number or year for 3/8 hoses?
I have set the chassis and lines so that the hoses run down the top front of the upper arm.
Due to my location in the UK I can't ask at the local car spares outlet .

Any help appreciated!

68racer · 03-13-2005, 03:51 PM

Actually guys i could do with some help on this one.
What years on 70's trucks had 3/8 UNC holes in the calipers and which had 7/16 UNF?

72402 · 03-13-2005, 11:56 PM

Don't know what year they changed, but I think you'll find that they are actually 10 mm instead of 3/8. I doubt if they'll work with the 7/16 lines. I ran into this recently using a set of spindles and brakes from a 91 Suburban on a 67 pickup. I believe the bolts were listed as 10mm-1.5, the 1.5 being the length. Hope this helps a little. Frank

68racer · 03-14-2005, 05:45 PM

Yep, that's sorted it, thanks Frank.

03-12-2005, 05:29 PM	#1
68racer Yeah baby! Join Date: Feb 2001 Location: United Kingdom Posts: 436	Caliper Question I'm swapping to a later front suspension clip before the 502 goes in. Over the years I have been collecting parts. I now find the recon calipers have a 3/8 UNC thread for the hollow hose bolt. The hoses have a 7/16 hole in the end. The hollow bolts that came off the old clip are 7/16 UNF. At what year did this thread change? If I get 3/8 UNC bolts can I use the hoses with the 7/16 holes? If not, what is the part number or year for 3/8 hoses? I have set the chassis and lines so that the hoses run down the top front of the upper arm. Due to my location in the UK I can't ask at the local car spares outlet . Any help appreciated! __________________ 11.37 @116

03-13-2005, 03:51 PM	#2
68racer Yeah baby! Join Date: Feb 2001 Location: United Kingdom Posts: 436	Actually guys i could do with some help on this one. What years on 70's trucks had 3/8 UNC holes in the calipers and which had 7/16 UNF? __________________ 11.37 @116

03-13-2005, 11:56 PM	#3
72402 Registered User Join Date: Nov 2004 Location: Cameron, Oklahoma Posts: 199	Don't know what year they changed, but I think you'll find that they are actually 10 mm instead of 3/8. I doubt if they'll work with the 7/16 lines. I ran into this recently using a set of spindles and brakes from a 91 Suburban on a 67 pickup. I believe the bolts were listed as 10mm-1.5, the 1.5 being the length. Hope this helps a little. Frank __________________ 72 Cheyenne SWB Fleet/original 402, TH400, buckets & console 65 C10, 350TBI, 700R4 (work in progress)

03-14-2005, 05:45 PM	#4
68racer Yeah baby! Join Date: Feb 2001 Location: United Kingdom Posts: 436	Yep, that's sorted it, thanks Frank. __________________ 11.37 @116



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