| Crusing in the Passing Lane Joined: Jun 2011 Posts: 5,096 | Sizing bolts in US trucks are almost always NC std. if threaded into cast iron or Al, bolts threaded into steel usually are NF std. of course there may always be exceptions. No metric bolts in US vehicles.
Ed Pruss
'37 GMC T-18 w/ DD 4-53T, RTO-610, 6231 aux., '95 GMC running gear, full disc brakes, power steering, 22.5 wheels and tires.
'47 GMC 1 ton w/ 302, NP-540, 4wd, full width Blazer front axle.
'54 GMC 630 w/ 503 gasser, 5 speed, ex fire truck, shortened WB 4', install 8' bed.
'55 GMC 370 w/270, 420 4 speed, grain, dump bed truck from ND. Works OK.
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