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Old 06-24-2016, 02:25 AM   #1
JLubben
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Location: Fairbanks, AK
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70 4speed clutch to newer block?

I need to replace the engine in my 70 c20. I was thinking of getting a reman or new vortec motor and installing a carb on it. I know I need a new flywheel and harmonic balancer for the 1 piece rear main crank. Will the clutch bolt up to that flywheel? What clutch do I order? I think I have the SM465.


Thanks!
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Old 06-24-2016, 09:03 AM   #2
Mike C
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Re: 70 4speed clutch to newer block?

The clutch should bolt up. Just make sure you get a one piece rear main seal flywheel that is drilled for the 12" clutch which should be what was in front of the SM465. Just order a replacement clutch for your year truck.
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44 Willys MB
52 M38A1
64 Corvette Coupe
68 Camaro 'vert LT1 & TH700
69 Z/28 355 12.6's @110
69 Chevy Short Step 4 1/2"/7" drop
72 Jimmy 4WD 4spd 4" & 35's
02 GMC 2500HD 4x4 Duramax
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Old 06-25-2016, 01:25 AM   #3
JLubben
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Re: 70 4speed clutch to newer block?

Awesome thanks! I was hoping the pressure plate would bolt up. Do I need a special Pilot as well?
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Old 06-26-2016, 07:56 PM   #4
Mike C
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Re: 70 4speed clutch to newer block?

I don't think GM made any changes to the pilot bushing, but you will find that out!
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44 Willys MB
52 M38A1
64 Corvette Coupe
68 Camaro 'vert LT1 & TH700
69 Z/28 355 12.6's @110
69 Chevy Short Step 4 1/2"/7" drop
72 Jimmy 4WD 4spd 4" & 35's
02 GMC 2500HD 4x4 Duramax
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