1969-1970 BB flywheel question?

[markrr]

Can anyone please tell me if the outside diameters are the same for a '69 big block flywheel as a '70 flywheel? I know each has a different side clutch. I want to know the teeth to teeth diameters.
Thanks

 

[rickseeman]

I think a 69 is 11" 143 teeth and a 70 is 10-1/2" and 130 teeth

Edit: That's on a Hemi, I don't know if a wedge is the same.

 

[Jerry Hall]

I think a 69 is 11" 143 teeth and a 70 is 10-1/2" and 130 teeth

Edit: That's on a Hemi, I don't know if a wedge is the same.

I think the 440's are the same. I'm not sure on a 69 383, but in 70 I think all big block engines got the 10 1/2" flywheel.

 

[59pwrwgn]

Flywheel has to match the bellhousing. Your car is 50 years old. My old 68 RR had an 70s aluminum bell with the 130 wheel because that is what someone put in there.

 

[markrr]

What I'm trying to do is start a 1970 383 on a run stand. I'm using a starter mounting plate and a '69 flywheel. When bolted up they're too close together. That's why I asked about the flywheels' diameters.
I just learned that the starter mounting plate must be used with a 130 tooth flywheel. I believe that would be from a 1970 and be a smaller diameter.

 

[rickseeman]

Same exact thing happened to me when I built my test run stand. I put the flywheel on there without thinking that it might be an 11". Starter won't fit. (My bellhousing was for a 70 RR.) So I had to order a 10-1/2" flywheel and now life is good. Except for my billfold which suffered damage.

 

[Daves69]

I believe the 143 tooth FW was typically used with a 11" disc setup and cast iron '68-'69 bells. Since the diameter of the 143 FW is larger diameter than a 130 FW, the starter is located further out by necessity. Aftermarket scatter shields can accommodate both FW sizes in most cases.

The 130 tooth FW is typically used with the 10-1/2" AND 11" SCALLOPED disc setups with the '70 and up aluminum bells.

FWIW, one can count the teeth between two adjacent clutch cover bolt holes on the flywheel to determine which FW is installed............

 

[59pwrwgn]

Sounds like you needs a 130 wheel. 143 would be 68-69 big block and 69up light duty trucks.

 

[Photon440]

I used the 11" flywheel (from a 1969 383) on my 1970 440, but I had the 1969 bell-housing to go with it.

 

[markrr]

Same exact thing happened to me when I built my test run stand. I put the flywheel on there without thinking that it might be an 11". Starter won't fit. (My bellhousing was for a 70 RR.) So I had to order a 10-1/2" flywheel and now life is good. Except for my billfold which suffered damage.

This is exactly what I'm dealing with.
Thanks to everyone that replied.

 

[velocityss1985]

small blocks also used the 130 tooth flywheel, the 383 and 440 had six bolt cranks and the Hemi was an eight bolt flange. 1970 was when the big blocks switched over to the 10.5" 130 tooth flywheel. I don't believe the 440 came with an eight bolt flange. The 130 tooth off a small block will fit a big block as well. There are also neutral balance and externally balanced flywheels.

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