300 flywheel

Brian Taylor · Post by **Brian Taylor** » September 18, 2010, 7:25 am

Is the flywheel in my 300 the same flywheel used in the small blocks, 302 351 ?

MadMaxetc · Post by **MadMaxetc** » September 18, 2010, 9:06 am

No. Tooth count is different. 300 has more.

frdnut · Post by **frdnut** » September 18, 2010, 10:50 am

More importantly it is not balanced the same..It will bolt up with the matching bellhousing but will cause a vibration.

MadMaxetc · Post by **MadMaxetc** » September 18, 2010, 11:54 am

frdnut wrote:More importantly it is not balanced the same..It will bolt up with the matching bellhousing but will cause a vibration.

Yes, that is a bigger problem.

Brian Taylor · Post by **Brian Taylor** » September 18, 2010, 12:14 pm

Thanks,
Just trying to find what I need to keep from the 300 to cnvert to the 351.

Thunderboy · Post by **Thunderboy** » September 18, 2010, 6:14 pm

Brian, you probably know this, but all 351s have a 28oz weight on the flywheel, as do all 289s and 302s until about 1980 or so (when Ford renamed it a 5.0), when they got a 50oz weight.

Brian Taylor · Post by **Brian Taylor** » September 18, 2010, 6:26 pm

I know a little about everthing and a whole lot about nothing. With that said, I am weak on Ford engine knowledge. I am wanting to upgrade my 66 from the 300 I6 to a 351 and trying to get all my ducks in a row.
Any help I can get to help with the change is very appreciated. I have not found a 351 yet but hope to score one soon.
I did look at a 69 351 W from a 69 Cougar today(C9OE) 2bbl for 200 bucks, but it had been setting for 18 years in a garage and I was not able to turn it at all. It had all acces and air cleaner to pan but I really want to avoid a full rebuild due to cost.
So if anyone has more info to make my conversion easier please chime in. NOTE TO PFM: no I am not going EFI LOL

MadMaxetc · Post by **MadMaxetc** » September 18, 2010, 8:54 pm

Take a look at my website. I think my 300 could run with a lot of 351s. I know it is way faster and will pull more than my 302 would.

I would look into doing some moda to your 300 as well as the 351.

R Pope · Post by **R Pope** » September 19, 2010, 7:55 am

I'm doing the same swap. I am using an M5 overdrive 5-speed and a 351 W in my '66. I looked for weeks for a used 'wheel, they wanted $100 for ones that needed a $40 ring gear and a $50 reface job. Bought a new one, with ring gear, for $180.
I advise putting PS and PB in the old Slick while you have the engine out, much easier to do without it in the way. And you WILL need PS and PB!
BTW, my 300 uses the same ring gear as the new flywheel, 164 teeth. I thought of getting a trans shop to weld the weight from a 351 automatic 'wheel to the six cylinder one, but didn't like the idea. They do it all the time with Mopar converters, but they might not have a template for a Ford flywheel.
You could take the six 'wheel to a balancing shop with the 351 plate and have them balance them the same. But then again, the cost is going to be too close to a new flywheel to bother.

Thunderboy · Post by **Thunderboy** » September 21, 2010, 1:00 pm

Brian,
If you plan to do some mods to the 351W, consider a roller-cam block model, they start with F4TZ on the oil pan rail near the starter motor. They are usually in 94-97 F-series and Broncos. A lot of people think it is only the the Lightnings, but I've found them many times. You can then run a hydraulic roller cam made for 5.0s, and the selection is terrific. The stock cam in it isn't bad, but if you put aftermarket heads on it, this is an easy way to get HP and torque.

Brian Taylor · Post by **Brian Taylor** » September 21, 2010, 3:02 pm

I am on a very tight budget. So each thing I get holds up the next. Roller would be nice but then to mod it more would take me way past what I can do. I am going with a stock 351W in front of my original 3 speed till I can afford a 5 speed manual tranny then I will upgrade the engine. It will be several months to save and rebuild the 351W and a year or more for a tranny. I have a 5 and 8 year old boys and they take most of my extra time and money. So reuse of parts is imparitive.

R Pope · Post by **R Pope** » September 25, 2010, 2:08 pm

The original 3 speed will work okay for a driver as long as you don't do big burnouts. A 5 over will get better mileage and pay for itself quickly. Either a M5 or a T5 from a V8 Mustang will work. If I had it to do over again, I'd hold out for the T5, the M5 has that weird co-axial throwout bearing/slave cylinder that blows out every winter and you have to drop the trans and cough up a couple hundred for a new one. They tell me that as long as you warm the engine up a bit before pressing the clutch, it won't pop the seal. We'll see!