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1972 Chevelle SS 454 M22
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here is the numbers

T1223CRQ
3963512
L-19-9

Any info and would this motor be considered a true LS5?
 

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70 Chevelle with 360HP 454 and TH 400
 

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I thought the "512" block was 2 OR 4 bolt main.
 

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The 512 was available as a 2 or 4 bolt main block in 70 and 71. The CRQ suffix code on the pad indicates it is an LS-5 360 HP with a Turbo 400 trans. this motor was a 2 bolt block. The 4 bolt main blocks were used for the LS-6 motor in 1970 and the 454 425HP motors used in Chevelles Corvettes and Monte Carlos in 71.
 

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T1223CRQ
3963512
L-19-9
_____________________________________________
T )- Tonawanda engine plant (engine assembly plant)..
1223 )- December 23, 1969 (engine assembly date)..
CRQ )- 1970 LS5 360hp/TH400 (Chevelle engine code)..
3963512 )- the Big Block Chevy #3963512 engine block, production began in October,1968 and ran through the end of the 1971 model year....
L-19-9 )- December 19,1969 (engine block casting date)..........Don.
 
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