The Stovebolt Site Forums The Shop Area General Truck Talk 6 Cylinder Engines

I’m trying to more fully understand which 6 cylinder engines were available over which years in both Chevys and GMC’s. Also what the basic differences were.

I know this has been discussed here many times, but I can not find a single complete listing. (Maybe I’m not looking hard enough) I know Barry has done several Tech Tips on the subject

I would like to send Peg a single sheet that lists the following info (assuming it’s not already available)


Years the engine was available
Was it available in cars, trucks or both
Was it a Chevy or GMC
Displacement
Valve cover bolt arrangement
Height of the side cover
Pressure or splash oiling
Babbit or insert bearings

I believe the various displacements include 194, 204, 216, 235, 261, 270, 302 and most likely several more

Hy Kip's41, I would suggest you set some parameters, first year, last year, and truck size for starters, hope that helps.

Kip,

Last year, Warren Foster & I put together the following pages for 1929-1962 stovebolt engines (Chevrolet in-line six cylinder engines derived from the 1929 194 cubic inch "cast iron wonder" stovebolt six). We have not yet made a set of similar pages for GMC in-line six engines from the same era but we could do so.

A few months ago, I think I offered these pages to Peg as a suggested Tech Tip.

Tim

here is what I tracked down once about the 1960-1966 trucks and their engines:

http://www.chevytalk.org/fusionbb/showtopic.php?tid/94177/


-W

Hey Tim, http://www.1954advance-design.com/ , great site, been there many times for research and really appreciate your effort. That chart pretty much covers the subject. I see you collaborated with Warren Foster on some of the material, good guy, I bought parts for my 3604 that I couldn’t find anywhere else.
I was wondering about something while printing out the chart from your site this morning. I have to print everything out in landscape or I loose the right hand margin. Is this a quark of my software or is this the way you have it laid out?
Denny Graham
Sandwich, IL

Early on GMC used Olds and Pontiac sixes if I remember right. I think from the flathead era, though I'm sure not an expert on those.

The light truck GMC overhead valve inline sixes are as follows:

228
248
270
302

I believe there are military versions of both the 270 and the 302 and both were available pretty early. The 228 and 248 are the standard motors in '47 to '54 1/2-ton stuff. The 270 was used in pickups starting in the late 50's I think.

When GMC started installing V-8's in pickups they used Olds and Pontiac motors again.

While the 2-ton was the largest truck Chevrolet made, GMC made bigger ones, and there are larger GMC sixes out there. I know little about them.

About '63 GMC introduced V-6 and V-12 motors which replaced the inlines in both the light and medium duty trucks.

A complete and accurate application guide would be a great thing to read. I sure don't have all the information, but the first place I'd look would be OldGMCTrucks.com.

From the 12th Edition of the Motor Truck Repair Manual:

GMC big sixes: 318, 360, 426, 503.

Pat

and 6-71 from the same era.