Flat head converted to overhead valve

[DRohacek]

This pulling engine is an aftermarket flathead Jones block . It is a heavier built block modeled after a Kohler K series that uses K series type parts. We turned this into an overhead valve engine using an Oldsmobile 455 head with roller rockers and other aftermarket parts inside to end up at 53 cubic inches and 13.5 compression

IMG_1518a.jpg

[DRohacek]

More photos

[DRohacek]

Couple more

[twoton]

Very cool.

[DRohacek]

Originally Posted by twoton

Very cool.

Thanks. I started with the Stromberg 2 barrel on gas but eventually changed it to a 44 Mikuni side draft on Methanol.

[V30crewcab]

that is impressive. why cut up the head though, would it not be easier to build a custom head, or is that not allowed in the rules?

[DRohacek]

Originally Posted by V30crewcab

that is impressive. why cut up the head though, would it not be easier to build a custom head, or is that not allowed in the rules?

To make a head from scratch out of billet aluminum would require a tremendous amount of machining. When you are done it would not necessarily be any better. No need to reinvent the wheel, just adapt a known good wheel to the project. Additionally, I acquired this head from a friend because it had a crack on one of the intake ports where it had been ported to deeply. Essentially it was junk to use on a V8 again but was perfect for my plan and big valves had already been installed. I used roller rockers and fit it to the block.

[DRohacek]

Intake is 2.15 pretty good flowing head to.

[V30crewcab]

cool. its amazing what you can make work!

[Odmark]

This is so cool! I would love to hear it run