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 Post Posted: Tue Jan 20, 2015 1:52 am 
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I don't remember exactly what I did when I swapped the one piece rms 350 in place of the old 305... I'm thinking I just put the pressure plate/disc on the new flywheel but I'm not positive. I'm about to start looking at clutch kits in case I have to replace the current one in the '78 (pedal feels like something is stuck/bound up in the bellhousing area), and may step up holding power a little (could feel the clutch slipping a little on quick shifts).

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'92 Sierra - EBL/TBI-fed Vortec 383/700R4/3.08
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'78 Malibu - Vortec 350/4-speed (for now)


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 Post Posted: Tue Jan 20, 2015 9:53 pm 
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Use the 10.4-inch disc and pressure plate for a 1978 Malibu on the later flywheel. The pressure plate bolt pattern did not change on the 1-piece RMS flywheel.


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 Post Posted: Tue Jan 20, 2015 10:23 pm 
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Ok I thought that was the case and what I did before, thanks :D

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 Post Posted: Wed Jan 21, 2015 12:21 am 
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But isnt the crankshaft lip smaller in diameter one piece vs the two piece rear main seal? I know they are with flexplates or maybe getting mixed up with tooth count 153 vs 168.

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 Post Posted: Wed Jan 21, 2015 2:13 pm 
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Possibly... the bolt pattern is different (or dowel is in a different spot, etc.), but the pressure plate and clutch disc never really get very close to that area. I had this clutch on a '78 305 when I originally converted the last car to a 3-speed from TH350.

I'm thinking I will step up a tad in performance if I can't get this one warranted, when I up shift at higher rpms it would tend to slip a little...

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'78 Malibu - Vortec 350/4-speed (for now)


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 Post Posted: Wed Jan 21, 2015 4:48 pm 
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Two different bolt patterns. The older two piece and the newer 86 and up are smaller then the older 85 on down.


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 Post Posted: Wed Jan 21, 2015 8:50 pm 
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MalibuRacing Junkie
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Yes, the crankshaft bolt pattern is different and the crankshaft is balanced by a flywheel imbalance...but the clutch pressure plate bolt pattern is the same.


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