The Stovebolt Site Forums The Shop Area Engine Shop GMC 270/302 Bolt Patterns

Do these inlines bolt up to Chevy Trans. Do they need adapters? Anyone with experience with these torque monsters? Any comments? Look something like the old International inlines. H. :confused:

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if you are talking about will they bolt where a 216, 235, or 261 the answer is yes. If you are talking about bolting directly to a th350, th400 or other automatic, the answer is no... you will have to use an adapter and have a flexplate drilled for the gmc crank. The muncie, warner, saginaw, and corporate manual transmissions should bolt up with little or no modifications to the engine. you may have to add a crossmember or cut a hole in the floor for the shifter, or get a new driveshaft to fit.

Thanks so much for this info. I'm thinking about putting this in a mid 80s truck. Just have to wait for a while but should be able to do this soon. Going to put a 292 in the one I have now. Just love those ole' bolts. Thanks again. H.

I would be cautious about putting an older engine in a newer truck... seems like emissions controllers don't like that too much! If you must go for a six in a later truck... the 292 is a wicked motor. Research is the key!

Oregon only checks emissions in Portland Metro and the Rogue Valley, and they don't look under the hood, just sniff the pipe. Everywhere else they don't give a hoot what you do to your car.

Hey bigbadswingdaddy, I agree with your advice on the 292. I'm going to try to find one this weeks all goes well. Fortunately Oregon where I live passed a law last year that it doesn't matter whats under the hood as long as it burns clean. My truck is an 87 and this is the last year for emissions on it. After 20 years old no more is required. Fortunately I don't live in the Portland Metro area as they are tested under load and have a high failure rate up there. Medford where I live is in the Rogue Valley. Before they had done under hood inspections but thank God no more. Eventually when the $$$ come in, I may add a Holley TBI to the 292. For now a good Edelbrock small 4bbl should do just fine with a Clifford or Offy intake and maybe a spacer. I wonder if a 2bbl from a 350 or other small block would be a good choice over the 4bbl? Should I take off the cat on my system or leave it on as its also 3" and is working just fine with the new Magnaflow Stainless muffler? If I do a rebuild on the 292 what pistons and cam would be the best for a daily driver? Stock with the block decked a bit or just some headwork? H.

I never thought I'd say this... I'VE GOT TO MOVE TO OREGON!

Hey bigbadswingdaddy, Come on up. Much cheaper to live here! Lots of old trucks here in this valley and many in the Illinois Valley nearby. Some are out in a field just sitting there for someone to pick them up cheap. Some probably still would run with a little work. I know where there are some. Only about 3.5 mil population in the whole state. Good fishing and hunting, prospecting and such. A slower pace of life. Especially in the small towns and in the eastern part of the state. A few still have a General Store with a wood stove in them. Most of those are gone. Jsut a thought. H. Been here about 18 years.