The Stovebolt Site Forums The Parking Lot Big Bolts Powere Rating For 1948

Forgive me for being over excited, but since purchasing my GMC 350 but not actually having it moved or getting to crawl around it much yet, I am speculating and collecting Data as best I can. I was not able to open the hood and thus have no idea what I am actually Going to find under there, but my Data tag specifies it is (was) a 95 HP engine.

Standard engine for this model was a 248 ( I think there were options ? ) does this HP correspond to a 248? ( the only data I can find in print for the 248 is "SEMA" standards and calls out about 32 hp ) I beleive we are talking about a 1948 model BTW in a 350 series truck.

Thanks
Dan

If the serial plate is still on the door post, it may tell you the HP rating for the original engine. The first 3 numbers on the engine serial number are the CID of the engine. S/Ns are on flat surface just behind the distributor.

Good Luck, have fun with it

GMCPic

Thank you for the response. The truck is NOT at my place and I have never opened the hood... so the numbers on the engine are not available to me. The plate in the door frame which i took a Picture of DOES specify a HP rating... a Rating of 95... thus the question....

Does 95 HP = 248 ci?

My 1954 Motor's Truck Manual show the only GMC engine at 95hp is the 228 from 1946-1954.

However, my 1948 FC302 has a 248 which the Motor's manual rates at 100hp and the tag on the door jamb says 89.5 hp so I really don't know what to believe!

Looking closer, the Motor's manual lists Maximum Brake H.P., my door tag is Certified NET HP, at slightly different RPMs, I'm not sure of the difference.

depending on whats on the back of it and what your going to be hauling it will be a lead sled, the only help with be the two speed rear, providing it's still operable.

Simply two different methods of determining the power for taxable point of view and/or an SAE rating and/or the advertising perspective. I guess I don't see why it matters so much. Why don't you check over at OldGMCTrucks.coma and see what they have to say.

I have noted several subtle differences between trucks manufactured/assembled in Pontiac Mich. or Fremont Calif.

Could this be an issue as to whether or not and how the serial plates differ. I.e. HP rating and GVW...?

I was just trying to confirm it was a 270, with the only information I had available to me at the time. I don't care what the numbers mean or what the number is... I was just curious if it was a number that corresponded to the 270.... Although I believe the 270 was the only option in that particular truck....

Like I said I am not sure what I will find IN the truck currently, the former owner used to do a lot of mil Surp stuff... so It could be a 302 ... Guess I need to make room for it and go pick it up.

According to "OldGMCTrucks" Truck Model Identification ALL "35x" came with a 248 CID engine from 1947 through 1954. No other options are listed.

The still does not mean someone along the way did not replace the engine with something larger.

http://www.oldgmctrucks.com/page0191.html

[x denotes numbers 1 thru 5]

Good Luck and Happy Motoring

Not all 2 tons came with 2 speed rear axles.

It was not until 1954 that F35x-27 had a 270.

302s were not available until 1952 in the 450 and up series.

Yeah, 248.... thats what I started this thread with, Dunno why I said 270 lastnight. anyway... I still dont know what is actually in it, as it is still waiting on 3 wheels and a ride to my shop.... other things have taken priority. the only reason I mention a 302, is becuase of all the De-mill stuff the PO used to haul ( the truck was used to move old Millitary "quanset" buildings bought at auction), Old Mil trucks are known to have 302's.... could be the PO got a hold of one...... speculation and VERY wishful thinking is all.

in all I retract the question, as the only possible Stock engine is a 248.... when I posted I thought there were options and I was trying to guess from the only available info.

it either has a 248 (that it would have come with) or it doesn't, I will know soon enough I guess.

Dan,

Your question is not unreasonable. I have a 1954/55 GMC 350 COE and it has a replacement 270 engine (and, I think it had an optional 270 as the original engine).

Your truck might easily have had a replacement over the years.

Good luck on finding it has a 302 - that would be nice. The 270 is also a fine engine (and, there is nothing wrong about a 248 - just less power).