petryshyn
1/2 ton status
I am wondering if their are benifits from running the larger size clutch. Also are the flywheels the same for both of the clutches, will the pressure plate bolt up thanks.
CK5
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11" Clutch vs 12"
- Thread starter petryshyn
- Start date
The flywhels are the same so either will bolt up. Bigger is better, more surface area for grippage. 
dodgedude99
1/2 ton status
i just bought a GM 454 HO motor, the flywheel they specify (GM part #) will only take up to a 11" clutch.
pressure plates//\\
I had bad luck with the 3 finger style 12 inch pressure plates,2 of them failed in a months time--many others I sold them too did too--one lever loses its adjustment,and the clutch chatters at first,then wont release all the way..I'd use a 12" Diaphram style pressure plate(if your bellhousing and flywheel allow it!,not all do!)--if not,an 11" diaphram type is plenty beefy--and easier on the left foot if you dont have a hydralic clutch setup--the 12" 3 lever type are a left leg killer..
.As for the surface area,I was suprised to learn the "dinky" 10.5 inch clutch used on some 6 cylinder trucks actually has nearly the same amount of friction surface as a 12 inch does--its lining extends closer to the crankshaft than the 11 or 12 inch ones do...not much difference..
I had bad luck with the 3 finger style 12 inch pressure plates,2 of them failed in a months time--many others I sold them too did too--one lever loses its adjustment,and the clutch chatters at first,then wont release all the way..I'd use a 12" Diaphram style pressure plate(if your bellhousing and flywheel allow it!,not all do!)--if not,an 11" diaphram type is plenty beefy--and easier on the left foot if you dont have a hydralic clutch setup--the 12" 3 lever type are a left leg killer..
.As for the surface area,I was suprised to learn the "dinky" 10.5 inch clutch used on some 6 cylinder trucks actually has nearly the same amount of friction surface as a 12 inch does--its lining extends closer to the crankshaft than the 11 or 12 inch ones do...not much difference..
petryshyn
1/2 ton status
Thanks for the replys. Think i will go with a 11" don't want to much of a workout with the 12" 
REDCRO_REDNECK
1/2 ton status
I use the 12" clutch in my mud truck, (from 1ton 1978 chevy 4x4) bought it from autozone with lifetime warranty 
It is a work out when you need to hold it for long periods of time(hydro clutch), but for me it is just a toy and I wanted beef.
It is a work out when you need to hold it for long periods of time(hydro clutch), but for me it is just a toy and I wanted beef.
