Ls5 454 ? - Chevelle Tech
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post #1 of 6 (permalink) Old Jul 3rd, 06, 10:13 AM Thread Starter
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Ls5 454 ?

here is the numbers

T1223CRQ
3963512
L-19-9

Any info and would this motor be considered a true LS5?
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post #2 of 6 (permalink) Old Jul 3rd, 06, 10:20 AM
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Re: Ls5 454 ?

70 Chevelle with 360HP 454 and TH 400

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post #3 of 6 (permalink) Old Jul 3rd, 06, 1:04 PM
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Re: Ls5 454 ?

3963512, is the block casting # that should denote it as a 2-bolt main block with the CRQ suffix stamped on the front pad, which is correct for an LS-5. The L-19-9 is the casting date of the block which is Nov. 19 1969.
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post #4 of 6 (permalink) Old Jul 3rd, 06, 1:23 PM
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Re: Ls5 454 ?

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

72 ss 454 "W" code,w/cowl induction (how many left?)
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post #5 of 6 (permalink) Old Jul 3rd, 06, 5:37 PM
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Re: Ls5 454 ?

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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post #6 of 6 (permalink) Old Jul 3rd, 06, 6:10 PM
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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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