It looks huge compared to a 235. I know where one is now, but don't know the condition. It's in a scrapyard with the carb, gen missing, other than that it's comeplete. The hood isn't on it now but it looks like it probably was till they brought it in. The hood is beside the truck.I tried to turn it over by hand, but since my heart attack I'm not as strong as I used to be. Haven't tried with a wrench yet. Just found it yesterday. I've heard talk and read on here that some of the GMC six's were pretty good on the strip. This one is in a 48-54 truck. If it turns over with a wrench what would it be worth? I know the guy that runs the yard will want @ 100-125 for it. What displacement were they? How hard to get speed parts, etc. Any info will help. I've already bought the valve cover cause it would look cool hangin' in my shop.thanks
GMC made it easy on you. The machined pad where the distributor goes in the block will have the displacement (228,248,270,302) stamped in it. Any 302 should be worth that, as well as any 270 with the large (1.75 inch) port head. Small port 270s and the smaller engines are much easier to come by.
Go over to www.inliners.org for some info. Check this page out too: www.6066gmcguy.org/Inline6.htm. That second site has some interesting V-12's made by mating two V-6 blocks. Never saw one of those before! These are newer sixes than what you have though. Inliners should be able to help with info on the older ones.
I remember when I was a kid these where popular with dirt track racers , and yes they hauled ass...........
All I could find was the serial #? on the block by the dist. The door tag listed it as 85.5 h/p. Small six?? I didn't have a pen with me so I couldn't write down any #'s. It'll be Monday before they open again.
Did the valve cover have a GMC logo on it? A 216 Chevy would have a tin side plate that extended all the way to the bottom lip of the valve cover, with holes for the spark plugs to go through. A GMC has a short side cover that covers the block only, but unlike the short side cover on a 235 Chevy, the top of it screws into the lower side of the cylinder head--the 235 side cover screws into the block all the way around.
Probably not worth it unless you needed restoration parts. Uncracked cylinder heads bring good prices, cranks that will clean at .010 or .020 are scarce. Trading stock ...
Getting ready to start a build on a Chevy 261 Inline 6. It's probably going to cost something like twice as much as building a sbc. The Jimmy 6 was the hot setup, back in the day. They are completely different from a Chevy. Used speed parts will be very hard(next to impossable) to find. A built one is really old school bitchin, but it comes with a cost.
Was there a serial number on the door? Something like F35327xxxxx? This is the actual first six characters from the GMC truck I looked at last night. The letter and number identify the body and load rating and the next two numbers are the engine size, in this case a 270. When you say 'looks huge' do you mean a couple inches longer and maybe an inch taller? Or do you really mean huge? GMC made some sixes that were much larger physically and internally than the 228, 248, 270, 302 that were in pickups and light trucks. One of those could be 400 cubes but its not a motor I've ever heard of anyone hot rodding or even finding parts for...
To me it looked alot bigger than the 235 looks. It might be the way the truck is setting. I have to look at a weird angle. I'll check and write down the #'s off the block and door Monday.
Right, they were in medium duty trucks, and were made in 361, 426, and 503 cubic inch versions. They're easy to tell from the smaller GMCs--the manifolds are on the passenger side of the head.
Well, damn it, it's a small series GMC of some sort! I've looked at a lot of them, and I've never seen one that doesn't have the cubic inch size stamped in the distributor mounting pad; doesn't mean it couldn't happen, but I've never run across one yet. Be sure to measure the intake port size. If it's 1.75 inches, grab it.
I have run one in my model a for a couple years. Most low end torque i have ever experienced! I am now putting a 302 gmc in a HA/GR car for this summer. Will be a mokan and goodguys Indy for sure. I just couldnt have another small block chevy in my life!!!
Back in the days, when these were popular, there was a company that made a 12 port head for these engines. Seems like it was a cross flow and really made those 302's scream.
Ok here's what I got today. Got soaked cause it rained all weekend. There is a small pond all around the truck. off the left side of the head, cast into it, Ferro A319 2136477 AL At distbutor B 2282I8431 On door tag FC 152 9886 85.5 hp @ 3000 rpm Does that help anything? Thanks in advance.
from what I could find its a 37-39 228cid engine built at the tonawanda n.y. plant ....... but wait for the others to confirm that.....
That one will only be interesting to a serious restoration guy. Anyone wanting to hot rod a GMC will want a 302 and might accept a 270.
Hey Alfster, any chance of a sound clip of your car? I'll bet that thing sounds as awesome as it looks. Details please. Paul
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