239 y block engine hop up

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Mar 10, 2019 | 03:38 PM

pintoplumber

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Cargo Master

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From: Lititz PA

239 y block engine hop up

I loaded pictures from my camera to the IPad so I thought I would post some here. They’re from 2013 when I put new heads, crank, pistons and rods in it.

I had bought G heads which have bigger valves and higher compression, but you can’t put them on a 239 without some modification.

Mar 10, 2019 | 04:00 PM

pintoplumber

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Cargo Master

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From: Lititz PA

The water passages from the block don’t line up with the water passages in the head, so you have to modify the block.

I had to drill new water passages in the block at cylinders #4 and#8 to line up with the holes in the head. The new head gaskets close up the now unused hole in the block.

Because there wasn’t much gasket coverage I had a welder build up some triangular gussets. I had him keep it below the deck surface and I used epoxy to make it level with the deck surface.

Mar 10, 2019 | 08:05 PM

pintoplumber

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From: Lititz PA

Here’s the water passage at #8.

Mar 10, 2019 | 08:15 PM

pintoplumber

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From: Lititz PA

The cylinders were previously bored +.125” making them the same size as a 256 or 272. I used 272 pistons with the 312 crank to get the correct pin height.

Mar 10, 2019 | 08:25 PM

pintoplumber

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From: Lititz PA

Here’s the new G heads on and degreeing in the camshaft. That gave me the most trouble ‘till I understood what I was doing.

Mar 10, 2019 | 08:36 PM

pintoplumber

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Cargo Master

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From: Lititz PA

Here’s a shot of the 312 crank.

Mar 10, 2019 | 08:41 PM

pintoplumber

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Cargo Master

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From: Lititz PA

And the engine going back in.

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Mar 10, 2019 | 11:07 PM

abe

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From: Central PA

I was fortunate enough to drive Dennis's truck. And he let me get on it!

For those of you coming to the Central PA Mountain Truckstock in September you'll be able to see his truck.

Mar 10, 2019 | 11:57 PM

#10

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Logistics Pro

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From: Deerbrook, WI

I met Dennis and his truck at the Kentucky Truckstock. As Dennis was telling me about his racing exploits and quarter mile times and speeds, I remember being so impressed that old trucks like ours could be driven so fast. I was having a very hard time keeping my truck on the road at 60 mph, and just couldn't imagine how Dennis could drive his so fast--and live to tell about it.

Thanks for sharing some of your "secrets" with us. Do you have an idea on how much hp your modified engine produces? Stock is in the 120-130 hp range, right?

I'm looking forward to seeing you and your truck again in Pennsylvania. Dennis brings the special ice cream to Truckstock and cooked up a traditional Pennsylvania breakfast delicacy for us (that sadly) I was afraid to try.

Jim