| Crusing in the Passing Lane Joined: Jun 2011 Posts: 5,096 | They are great, however, they don't make them for all, not GMC 503, ordered raw mat'l from them, could not make good gaskets from scratch.
Don't forget, we need to leave the bolts between manifolds loose until they are both tight to the head.
Ed
'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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