This needs an idi Motor....

towcat

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icanfixall

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I think this motor was the best looking motor GM ever made. Those distinctive head shapes were out of this world for the years... 348 or 409... I like them all no matter what.....:sly
 

Alex S

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I think this motor was the best looking motor GM ever made. Those distinctive head shapes were out of this world for the years... 348 or 409... I like them all no matter what.....:sly

Yea one of my faves :sly

Also another i like is the old GMC 305 V6 (also had larger displacement versions) used in ther 60s pickups and larger trucks

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kinda makes our diesels look like a toy :eek:
IIRC they did have a diesel version
 
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icanfixall

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Wow... Would ya look at that engine. That manifold sure is sweet. Gees... The spark plugs are on the inside of the V 6. I'll bet with that cylinder spacing it ran cool all the time. Seems like it needs a few more head bolts around the cylinder too... Nice motor....
 

Knuckledragger

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I've seen Offenhauser stuff at swap meets, but I've never seen exhaust manifolds like that...

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They might be old Marine logs, meant to be liquid cooled.

I like the distinctive look of the 348/409 engines, but think it goofy that the combustion chambers were all in the cylinder, not head. From a machining point of view, not an elegant or useful design. VW brought that back in their VR6 engines.
 

Knuckledragger

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Wow... Would ya look at that engine. That manifold sure is sweet. Gees... The spark plugs are on the inside of the V 6. I'll bet with that cylinder spacing it ran cool all the time. Seems like it needs a few more head bolts around the cylinder too... Nice motor....

The spacing was for larger displacement without changing tooling. I had a 378 cu. in. V6 like this one, I think all they did was keep putting in larger and larger pistons, maybe more stroke, too. Lots of torque.
 

bubblegum

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Was that "big-block V6" not the base for the 702 V12 "twin-six" GMC engines? The valve covers most certainly look similar...
 

Clydesdale

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/\ yip... Local pic and pull has one of them v-12's on a stand for display.. I flat love that motor
 

bubblegum

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I only saw it once, it was attached to a well pump or something, it was a farm equipment so to speak. Never did hear it run, it just looked so cool! And now imagine it as a diesel!
 

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