Fuel Tank Selector Valve mounting bolt size - The 1947 - Present Chevrolet & GMC Truck Message Board Network

sweetk30 · 11-19-2018, 04:05 PM

1/2" hex for the socket / wrench size . bolt has american grading markings on it not metric .
5/16" x 18 fine thread just under 1" full length but pointed end with 3/4 threads usable . has a built in cone shaped locking teeth edge flat washer with a o.d. of about 3/4" that cant be removed from the bolt .

i have 2 switcher valve here in the shop . the bolt threads in both the 83 and 87 c-10 trucks . 83 was 6.2 diesel 87 was tbi 305 gas . both switcher valves have captured nuts of threaded body's on them .

i love ratchet wrenches for tight areas .

11-19-2018, 04:05 PM	#2
sweetk30 Registered User Join Date: May 2012 Location: horseheads,ny rust belt Posts: 2,794	Re: Fuel Tank Selector Valve mounting bolt size 1/2" hex for the socket / wrench size . bolt has american grading markings on it not metric . 5/16" x 18 fine thread just under 1" full length but pointed end with 3/4 threads usable . has a built in cone shaped locking teeth edge flat washer with a o.d. of about 3/4" that cant be removed from the bolt . i have 2 switcher valve here in the shop . the bolt threads in both the 83 and 87 c-10 trucks . 83 was 6.2 diesel 87 was tbi 305 gas . both switcher valves have captured nuts of threaded body's on them . i love ratchet wrenches for tight areas . __________________ 77-k30lb BIG truck build . 87-k30lb budget beater build . 85-k30lb the plow machine build . 85-c10sb summer fun toy . ----------------------------- HOLLEY SNIPER efi = worst case of p.i.t.a i ever had . EDELBROCK pro flo 4 = best deal going so far . love my setup works great.



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