Help!! Flywheel bolts!!

[Skud]

OK, so I'm doing an 11" to 10.5" conversion at the same time as the motor is out. I have a Fidanza Al flywheel which has the holes for both an 11" and 10.5" pressure plate. The clutch/PP combo is a custom unit from Promotion Powertrain and it's a 10.5" unit.

The problem is that the bolts on the flywheel for the 10.5" clutch are smaller. They look like 1/2" bolts vs. the 5/8" ones that are stock. The stock ford pressure plate bolts do fit into the Fidanza flywheel for what would be an 11" pressure plate.

I bought a set of ARP Ford Pressure plate bolts and while they are the right size, I think they're the wrong thread pitch. They make a couple of clean turns into the flywheel and then things get real tight.

Does anyone know what the proper bolts are for putting a 10.5" setup on a Fidanza flywheel?

Thanks!!
Riley

 

[Skud]

Allright, so I did find out what bolt DOES fit..

I have a set of stage 8 header bolts and they are the correct size. They thread cleanly all the way through the flywheel. It's definitely a thread pitch issue. The header bolts are fine pitch and the ARP pressure plate bolts I have now are coarse.

So, does anyone know what FORD (or ARP) bolts will fit?

Riley

 

[Skud]

Allright, I'm going to answer my own question. Hopefully this helps someone in the future.

1) On the Fidanza flywheels there are two sets of holes:
- One is for an 11" clutch/PP. These holes are what LOOK to be 5/16.
- One is for a 10.5" clutch/PP. These holes ARE 8mm with a 1.25 pitch.

2) There are only two bolt packages I can find:
- FMS-M-6397-A302 is a Ford Motorsports package that comes with 6 bolts/washers and three dowels.
- ARP-108-2202 is an ARP kit that appears to be for a honda clutch/PP. They are still 8mm x 1.25 though. You get 9 bolts/washers. I have no idea if these would work.

So, it appears APR does NOT make the proper bolts for this and this is REALLY weird because some sites list FMS-M-6397-A302 as the correct bolt for up to the year 2000 with a 10.5" clutch. If I recall correctly, ALL mustangs had a 10.5" clutch until ~2001 when they switched to the TR-3650 and 11" clutch right?

I would think ARP would make a bolt for a clutch/PP package that spanned 10 years..

EDIT: I take it back.. Apparently ARP has a "NEW" item (ARP-150-2202) That is a 8mm x 1.25 bolt for Ford. Summit lists a ship date of 11/28/2007 though ..

Riley