A little background first . . . I am currently restoring a 1950 F1 that came to me in pieces. It came with two 226 H series flatheads. One was from a car and the other from a truck. I am using parts from both engines to build one good engine since the truck motor had a huge crack in the block.

The flywheels from each of the two motors are different. The "car" flywheel is set up with a 114 tooth ring gear and is drilled for a 9 1/2" clutch. The "truck" flywheel has a 112 tooth ring gear and is drilled for a 11" clutch. Since I plan on using the HD 3 speed transmission that came with the truck I want to use the 11" clutch setup. Unfortunately, the 112 tooth ring gear is fairly chewed up so it would require replacement. I was wondering if my 11" clutch flywheel is actually off of a V8 since I understand that the V8 flywheel will fit the 226. If so, I should be able to get a ring gear relatively easily. Do these flywheels have any part numbers on them so I can identify what flywheels I have? If so, where are they? If not, how do I identify the 11" flywheel so I know if the V8 ring gear will fit?

Additional info: The 114 tooth ring gear on the "car" flywheel is pressed on from the engine side of the flywheel, has an inside diameter of about 12 3/4" and a measurement from the inside diameter to the tooth top of 3/4".
The 112 tooth ring gear on the "truck" flywheel is pressed on from the transmission side of the flywheel, has an inside diameter of about 13" and a measurement from the inside diameter to the tooth top of 5/8".

I can get some photos if they are needed.

 

I'd be surprised if a V8 flywheel fits the 7H 6's. Ring gears are different. I think someone put a V8 flywheel on the Truck engine, just based on the tooth count, but I would be leery of doing that.

 

Ross, if you look back at your chart, it shows a 112 tooth gear for the 48/49 226. Perhaps the truck engine was an older one.

 

That was my thought since I know this truck originally had a V8 in it and neither of these engine I have were ever installed into this truck. Notice that in the parts listing both the 112 tooth and the 114 tooth ring gears fit the same flywheel (8HT-6375). The ring gear on my 11" flywheel would not interchange with my 9 1/2" flywheel as you can see from the dimensions I gave in my first post.

I therefore believe that the 9 1/2" flywheel is indeed a 226 flywheel (8HT-6375) and has a 8HA-6384 ring gear. Since the 48/49 226 F1 112 tooth ring gear (2GA-6384-A) fits the same flywheel as the 114 tooth ring gear, my 11" flywheel is something else. I believe it may be a V8 flywheel (8RT-6375) but I do not know how to verify this. And, if it is not, what is it from? This is my dilemma . . .

 

Only one Truck flywheel is shown for the 226/254, see below, with the 114 teeth. More likely the 112-tooth flywheel is from a car as you guessed. I don't have any car listings, NumberDummy might.
I have to believe there are plenty of good used truck flywheels out there, check with Josh (jmadsen), maybe even Bryan ("brain") on here.

 

I had a bad 226 11" flywheel on my 52F2 - I put a V8 Flywheel with a 10 inch pressure plate and clutch. I also swapped out the starters from a 6 cyl to a V8

 

Well, if I don't mind going with a 9 1/2" clutch, I can use the "car" flywheel with the 114 tooth ring gear and a 9 tooth starter drive. That ring gear looks good. If possible though I want to use the 11" clutch which I assume will work since it was installed with the clutch disc and pressure plate along with the HD 3 spd transmission.
In all my research, it appears as though the 239 V8 flywheel has the same bolt pattern as the 226 I6 flywheel and is the same overall diameter. The only difference is in the ring gear which is offset slightly to the rear by a few thousandths. This offset does not affect the starter drive though since the drive moves back over 1/4" at release.
So, I am back to my original question. Is there some way to identify these flywheels other than making the suppositions that ALBUQ F1 and I have been making from the parts listing catalog.

 

Clearing the block and fitting up to the starter is good, as far as using the V8 FW, but does the face of the flywheel allow the clutch to work properly? Did you have any problems, Dick?

I'd be inclined to use at least a 10" clutch on a truck, or an 11" if used as a truck (hauling, etc). I don't know of any ID # on the FW's, can you post pictures?

 

OK, the 11" flywheel is on the right and the 9 1/2" on the left.

 

You can have the 9.5 FW re-drilled for a 10 or 11" clutch. It needs to be done accurately, with proper countersinks. By that time tho you may be close to the price of a brand new V8 flywheel already drilled.

 

If I can be reasonable assured that the 11" flywheel is from a V8, I will buy a new 112 tooth V8 ring gear since they are still available at MAC's and a few other places. Cost is only about $40. Refacing the surface should not be too much more and for under $100 I should be set to go. A new V8 flywheel is available from Speedway but costs around $250 plus shipping. The advantage there is that it weighs about 10 lbs. less (24 lbs) than the original at 35 lbs. I'd rather stick to the $100 fix . . .

 

I've had no problems - I have not ran the truck yet - I did spin the engine over with the clutch engaged and disengaged, no noises and the trans throughput works as advertised
The 11 in flywheel's surface looked like a spiderweb with the heat cracks it had - My machinist took a couple swipes at resurfacing it and the cracks were too deep to go any further - I had to go with a 10" anyway because I could only find a 10" disk to fit up with the trans I'm using

 

On the starter ring gear....in the old days we would heat them up and turn 'em a 1/4 turn on the flywheel so they would wear in a fresh place. The starter seems to always engage in the same 2 places on the gear......

 

An interesting idea. I have also heard that you can remove the ring gear, turn it over and reinstall it to get the unworn part of the teeth to the starter drive gear engagement area. Both sound like good ideas if I cannot get another ring gear. I am tempted though to purchase the V8 ring gear just to see if it is correct. I am just looking for someone who can look at the pictures and tell me with some certainty that the flywheel is or isn't the 239 V8 flywheel. I find it hard to believe there is no part number on these things.

 

They both look like 6 cyl flywheels to me. The 8ba V8 wheel is more flat on the back.
I can look thru my flywheel pile tomorrow and compare.
Flipping the ring gear is possible on some, make sure the shape of the teeth is the same on both sides......I seem to remember they only go on one way. That's why we turned them.