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Old 08-14-2018, 04:07 AM
jer jer is offline
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I bought the McLeod SSpro for the '69 post L78 which has a 427 now. It may never see the strip.
I cut my teeth regarding clutches with a 3200lb '55 chev with this very engine. Started with a DF and a Muncie, that slipped and warped the steel flywheel. That's a tough pill to swallow beings how much those flywheels cost. I went with a steel 40lb flywheel, and a full ceramic disc and that same pressure plate, just rebuilt. That slipped so eventually went to a full metallic and switched to a jerico.
All these saw a lot of street miles but still saw some very high rpm launches, wheels just barely separating from the pavement.
Now that car's gone but upon teardown, noticed the flywheel showed signs of heat so had it surfaced.
That DF pressure plate had seen better days so it got tossed in favor of the Mcleod, which is the same pressure and again, the same disc as the centerforce.
IIRC, our engines are very similar except I'm running some worked 063 heads and a SFT Crower 01351 cam.
I'm telling you all this because so many things are at play here. Whichever clutch you pick, it'll be a compromise. Go too light, you'll slip, just won't know the extent of the damage till it glazes or lets go, but it'll always slip a little. Slipping will heat your flywheel/PP and the more aggressive of friction composite, the less it'll slip but the more that disc will cut into your steel surfaces. The safest way I know to run the street and strip is use a Mcleod RST, save the RXT for above 600ft lbs and higher rpm launces.
Spend the money now or you'll for sure be changing out your stuff within 2 to 3000 miles. That's IF you dragrace a little.
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