Dedicated to the Promotion and Preservation of American Muscle Cars, Dealer built Supercars and COPO cars. |
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#1
08-05-2008, 04:38 AM
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427 L72 COPO Crank
I am having a dilemma. From what I have seen/been told, 1969 427 L72 COPO motors came with 7115 crankshaft. I have also seen COPO motors for sale with 6223 crankshaft claiming it is correct for that motor. The little bit of research I have done makes me think that the 7115 crank only came with L88/ZL1 motors. Could someone set me straight on which one came with the motor, 'cause I'm confused...which isn't hard to do.
 Thanks, Kurt 
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 1969 SS396 Post Sedan Delivered to Van-T Topeka KS MCACN Day2 Concourse Gold Award 1965 VW El Lobo Dune Buggy built in the mid 70’s for the Iowa Shriners 1968 Schwinn Orange Krate 1969 Schwinn Pea Picker 1968 Schwinn 5-Speed 1970 Schwinn 3-Speed Deluxe 1972 Schwinn 10-Speed Continental 1973 Schwinn 5-Speed Suburban All Original Paint Bikes 
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#2
08-05-2008, 09:57 AM
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Re: 427 L72 COPO Crank
I have a 7115 crank (got it with a #512 block) with smaller counterweights than those on the L88/ZL1-cranks, so there are at least two different types of it.
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Anders Stålklint. After selling my COPO 9561 I´m now a "postman" with the main project being a 1966 327 2 dr sedan Chevy II. 
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#3
08-05-2008, 02:37 PM
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Re: 427 L72 COPO Crank
Chuck [427 King} would know the answer. Shoot him a PM.
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Tony 55 Nomad Gasser 70 SS 427 Nova 34 Ford Sedan..Hemi powered Michigan/ Florida
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#4
08-05-2008, 06:05 PM
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Re: 427 L72 COPO Crank
The other #512 shortblock I have has a 6223 crank in it. I have never had the chance to look at the crank that is in my original engine in the car, but I thought most COPO 9561 engines had the 6223 ?
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Anders Stålklint. After selling my COPO 9561 I´m now a "postman" with the main project being a 1966 327 2 dr sedan Chevy II.
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#7
08-05-2008, 07:08 PM
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Re: 427 L72 COPO Crank
I believe the difference between the 6223 and 7115 crankshaft forgings are the width of several of the counterweights. I believe the 6223 is 3/4" and the 7115 is 7/8" presumably for balancing the extra mass of the 12.5:1 popup pistons used in the L88 and ZL-1. Knowing how GM operated, the 7115 crank could have been substituted for the 6223 crank based on availability so some 11:1 427's could have the 7115 crank as well.
Paul
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70 Camaro LA Z-28 03B Citrus Green LT-1 M-40 3.73's 69 Camaro X-77 Z-28 10C Cortez Silver M-21 3.73's Deluxe Project X - SOLD 69 Camaro X-77 Z-28 01B Garnet Red w/Black top, M-20 3.73 Deluxe Houndstooth
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#8
08-05-2008, 08:25 PM
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Re: 427 L72 COPO Crank
My 7115 is 3/4". I think they were used in 402 engines. This has been discussed before, I think mabye a year ago.
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Anders Stålklint. After selling my COPO 9561 I´m now a "postman" with the main project being a 1966 327 2 dr sedan Chevy II.
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#9
08-07-2008, 03:34 AM
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Re: 427 L72 COPO Crank
Thanks to all who replied. I just sent a PM to Chuck. Hope he can answer the question. From what I have seen, shouldn't be a tough one for him.
Kurt 
__________________
1969 SS396 Post Sedan Delivered to Van-T Topeka KS MCACN Day2 Concourse Gold Award 1965 VW El Lobo Dune Buggy built in the mid 70’s for the Iowa Shriners 1968 Schwinn Orange Krate 1969 Schwinn Pea Picker 1968 Schwinn 5-Speed 1970 Schwinn 3-Speed Deluxe 1972 Schwinn 10-Speed Continental 1973 Schwinn 5-Speed Suburban All Original Paint Bikes
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