Maybe it's the camera angle, but that appears to have the long nose on it. I've seen where the long nose trucks (Fire trucks, more specifically) had the 503. That and Detroit diesels. If that's not a long nose, then I'm out! Other than that, next time you go by, clean off the flat area on the block just behind the distributor. The first 3 numbers should be the CID
Not large enough for a 503. 194,230,250, 292 all look different than GMC engines, although about the same length. GMC valve covers are rounded on top with no length wise marks. Chevies have some kind of lengthwise marks. If it is a 292, the pushrod cover is about 6" high. Show a picture.
Last edited by EdPruss; Sun Jun 16 2019 04:14 AM.
'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.
You may have hit the Jack Pot with that one. Can't tell for sure, but it looks to have Dayton wheels on it, and the larger, flared out wheel well fenders, of a 400, 450, or 470 series truck. It has vent door glass, so if it's a 51 model, with pull down door handles, it will have a 270ci. GMC inline 6, and if a 52, or 53 model,with push button door handles, it will have a 302ci. GMC inline 6 cylinder engine. If a 450, or 470 series, it will have a Clark 5 spd., tranny, and a Eaton, electric shift 2 spd., rear axle. Nice truck. Check for a tag, on the back of the glove box lid. If there's one present, it will tell all about the trucks spec.s A 400 series, is a 2 1/2 ton, 450 series, is a 3 ton, and 470 series, is a 3 1 /2 ton. hope it's a case of mistaken identity. be a shame, if someone put a 292 Chevy engine, in that truck.
Spanky Hardy Collector Of Fine Old G.M. COE Trucks & Antique Holmes Wreckers
There are two ID plates to check; one on the driver's door hingepost and one on the inside back of the glovebox door. Both contain important information on the model and driveline configuration. The 4 speed suggests to me this is likely a 400 series with SM-420. Hard to guess which is why you need the information off the ID plates.