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Thread: Number on Cylinder Head
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02-25-2008, 01:31 PM #1Member
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Black on Black- 2000 Trans Am M6
Number on Cylinder Head
There is a number made into the driver side cylinder head right beside the powerstering fluid bottle. I was wondering what it stood for? Mine is 851
ThanksSLP LT's, SLP High Flow Cats, 3" Flowmaster CB, Comp Cam, SLP Lid, LS6 Intake, BBK 80mm TB, SFC, Ram Air HO Hood, Lowered, Torq Thrust II's
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02-25-2008, 02:17 PM #2Simpsons Did it!!
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83 Z28 new project- 98 Formula WS7-sold:(
its simply the gm casting number for your set of heads, thats all.
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02-25-2008, 02:27 PM #3Member
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Black on Black- 2000 Trans Am M6
Is that one of the numbers for stock heads?
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02-25-2008, 02:32 PM #4Junior Member
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White- 2001 WS6
what were the differences in the heads between the years. Were there any heads that were better than the other? ?I have the 241 heads.
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02-25-2008, 02:35 PM #5Member
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Black on Black- 2000 Trans Am M6
That is a good question, I'd like to know to. Does anyone have info on this?
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02-25-2008, 03:20 PM #6Senior Member
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Black- 2001 Trans Am (sold)
241/851=similar. 243=LS6 heads.
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02-25-2008, 03:23 PM #7Member
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Black on Black- 2000 Trans Am M6
One more Q, do you know the compression ratio on 851 heads?
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02-25-2008, 03:43 PM #8Senior Member
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black- 2014 camaro 2ss/rs
never heard of an 851 head. for the f-body they only used 853. and that casting number was used on the 99-00 cars.
here's some quick info
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