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Spanky, there may have well been 2 different 707 engines. The 707 of the 30's didn't resemble at all the other engines in the series you mention. That whole series of engines is pretty obscure because they were in heavy trucks that were run into the ground and scrapped. Smaller trucks were used by farmers and a lot of them spent most of in barns. I just don't have much information on the earlier big trucks and I don't know of anyone who does.

It's not GM, but my '68 Seagrave Fire truck has the Waukesha 817 Straight-six in it, and it sounds like a MONSTER. Of course, compared to Diesels, it's not so loud, but yeah, you hear it coming. These engines I think were born in the early 50s, as the 145GZB, same engine, different name. Two plugs per cylinder, dual ignition, dual batteries, oil cooler, governor . . . a beast.

Been around the Mack 707 a lot, too. Buddy had one with a knock, turned out to be a hole burned in a piston - wrong heat-range plugs, and plug was loose in the whole, let air in. Lean condition led to overheating. He ended up buying a whole other truck to part out, just to get the replacement piston he needed.

Rebuilding a 235 is a LOT cheaper! ;-)

-Michael

check out this 1-ton with a v-12 in it. Nice toy! Funny lookin, but nice

Wow, Freq that was cool. Now think of this if you did the same with a two ton LCF and grafted a standard two ton truck front end on you could have a V12 powered two ton that looked relatively normal.

Or maybe it would be easier to start with a standard two ton truck cab and put the LCFs' floor board in it then lift the cab on the frame and use the LCFs' running boards.

..."That sounds too cool, even if it was just on a display stand it would be an interesting piece of machinery to tinker on."
Still doesn't carry the monster quality of the GMC V-12, (something else I'd love to have), but that's still a huge engine!"

Bill, thats the same reason I want a harley...not the whole motorcycle mind you, just the engine on a stand. Something I could put in the garage, go out there once in a while, start it up and listen to the "potatopotatepotatoe" for a few seconds, then shut it off and go back in the house. Or maybe a JohnDeere A would do...hmmm.

Dave,

I got something different for you. I've got a John Deere with a 2-53 Detroit Diesel.

I also like Harleys. I had a '72 Sportster with long chrome straight pipes. I like how you described it. It sounds just like that ...till you rev it.

Bill

the biggest 6 i ever worked on was a diesel locomotive it had a alco 539 a massive 12x13.5 bore and stroke so thats what 1530ci per hole and a screaming speed of 900 rpm and 1000 hp