L Head Vs. F Head

there is also a 9.25" clutch option in the 60's on the F head and with the correct bellhousing and flywheel it can be used on the L head. I have one on my 134L

 

Interesting, thanks Don.

I've never compared them before, I'd have thought there was a bigger difference in power between the two.

 

Horsepower is most strongly connected to displacement. Same displacement, 60 to 72 is a 20% increase. That's a lot.

 

Is it time for this again?

Missing Horsepower Found!!

One of the enduring Jeep F-head mysteries has been solved. For years, owners of F-134’s have scratched their heads and wondered why the horsepower delivered by their engines did not quite match manufacturer’s specs. Now the truth can be told.

In the late 1940’s, government planners feared that a serious horsepower deficit would develop as the nation began its recovery from WWII. To meet this potential crisis, a top-secret National Horsepower Reserve was established under the auspices of the U.S. Forestry Service and with the cooperation of the Willys Motor Co. Under the plan, small amounts of horsepower were covertly diverted from each new F-head engine, and placed in a secret depository that had been built by the Civilian Conservation Corps inside a hollowed out mountain in a remote area of one of the western states.

Initially, all Jeep engines were included in the program, but Flathead L-134 models were subsequently exempted when it was shown that they had absolutely no horsepower to spare.

The program was discontinued in 1968, and over time the existence of the National Horsepower Reserve and the location of the depository were all but forgotten. However, the depository was recently rediscovered when it was inadvertently included in a tract of timberland auctioned off by the Forestry Service. While cruising their new tract, the purchasers came across the entrance to the depository, and upon opening it found a vast, multi-leveled chamber holding row after row of horsepower containers neatly labeled with the serial numbers of the donor Jeep engines.

All were packed in cosmoline, and appear to be in excellent condition. For proprietary reasons, the new owners are continuing to keep the depository’s location a secret while preparations are being made to hold a public auction to dispose of the horsepower.

Arrangements are also being made to contact the current owners of the Jeep donor engines, and to offer them the right of first refusal on the horsepower originally diverted from their engines. If you have reason to believe that any of this horsepower came from your early F-head jeep, and would like further information on the depository and the upcoming auction, you should contact the owners’ agents, Dewey, Cheatham, & Howe at (555) 277-xxxx, __________________

 

This stood out to me as well. I have a LHead generator. I might have to crack it in half. I have not to date noticed a difference.

 

Thats the efficency of the overhead intake, and the large valve diameter at 2". The largest intake valve on small block Chevys were only 2.02", and most PowerPack Chevy heads only ran 1.94" valves.
What I find interesting is the weight of the pistons is not the same. A little more metal for the higher compression ratio?
-Donny