I have an exhaust manifold with a casting number 3872765. According to NCRS Judging Manual and also A. Colvin's "Chevrolet by the Numbers" book, this is allegedly the correct manifold for my 68 327cid 350 horsepower car. However, there is no date code on the side facing the engine but rather some stampings on the outside such as "LH", large "GM", small letters "SCC" and a number 12 10 87 on a raised surface that looks like it may be a date code. Can someone tell me what I have as I assume this is NOT correct for my car since there is no date code facing the engine and this suspicious 12 10 87 number. All input greatly appreciated. Thank you, Kurt Bunting 68 Coupe
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Re: Exhaust manifold Question
Some mani's were dated on the back side and many from the 50's/60's era had NO year designator -- only month/year with months in alpha notation. The JG should give you an explaination as to what and where the sequence is (mine's at home).
Last, GM continued to build service spares as volume/demand warranted. Over the years casting particulars (font size/placement/designation) varied based on then current proceedures by the particular foundry turning out the part. Specifically, Saginaw Grey Iron foundry that fed Flint engine plant (correct source, with very few exceptions, for SB Corvette used single year digit coding on its parts while Tonawanda differed with 2-digit year casting codes.
Many of the first run reproduction castings from Paragon were 'wrong' in that casts were set-up according to 'last run' specifics instead of original from the period particulars. Castings produced were a nice copy of later GM service spare parts vs. 'correct' originals.... -
Re: Exhaust manifold Question
Some mani's were dated on the back side and many from the 50's/60's era had NO year designator -- only month/year with months in alpha notation. The JG should give you an explaination as to what and where the sequence is (mine's at home).
Last, GM continued to build service spares as volume/demand warranted. Over the years casting particulars (font size/placement/designation) varied based on then current proceedures by the particular foundry turning out the part. Specifically, Saginaw Grey Iron foundry that fed Flint engine plant (correct source, with very few exceptions, for SB Corvette used single year digit coding on its parts while Tonawanda differed with 2-digit year casting codes.
Many of the first run reproduction castings from Paragon were 'wrong' in that casts were set-up according to 'last run' specifics instead of original from the period particulars. Castings produced were a nice copy of later GM service spare parts vs. 'correct' originals....Comment
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Re: Exhaust manifold Question
Jack, I have the JG and it states that the date codes are on the side facing the engine and also that the date code follows the engine code format. The "date code" I have (if that's what it is,) doesn't follow that format since it reads 12 10 87 with spaces between the numbers. What do you make of this? Also, what do the letters SCC stand for? Judging Guide or Colvin's book do not address this. Thanks for your help. I'm always learning about this car. KurtComment
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Re: Exhaust manifold Question
Jack, I have the JG and it states that the date codes are on the side facing the engine and also that the date code follows the engine code format. The "date code" I have (if that's what it is,) doesn't follow that format since it reads 12 10 87 with spaces between the numbers. What do you make of this? Also, what do the letters SCC stand for? Judging Guide or Colvin's book do not address this. Thanks for your help. I'm always learning about this car. KurtComment
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Re: Exhaust manifold Question
Kurt,
Your questions reminded me of something that, please bear in mind, is coming out, dug up from memory.
If I remember correctly, the 1966 JM states that cast dates can be found (as previously described) on SB exhaust manifolds beginning in Nov 1965. When I had my former 66 (327/350), I had pitted exhaust manifolds and searched for better originals. I thought I found a pair through a well known parts supplier, ordered them, and when they arrived was surprised to observe a date casting on the front similar to what you have. They were not correctly dated, or "original" but reproductions. I don't have that great of a recollection of them because I boxed them back up for return within 15 minutes.
Going by what you have found in the 68 JM, I believe what you are asking has to do with reproduction exhaust manifolds. Jack may, but I do not have information for the "SCC". Tom #24014Comment
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Re: Exhaust manifold Question
Kurt,
Your questions reminded me of something that, please bear in mind, is coming out, dug up from memory.
If I remember correctly, the 1966 JM states that cast dates can be found (as previously described) on SB exhaust manifolds beginning in Nov 1965. When I had my former 66 (327/350), I had pitted exhaust manifolds and searched for better originals. I thought I found a pair through a well known parts supplier, ordered them, and when they arrived was surprised to observe a date casting on the front similar to what you have. They were not correctly dated, or "original" but reproductions. I don't have that great of a recollection of them because I boxed them back up for return within 15 minutes.
Going by what you have found in the 68 JM, I believe what you are asking has to do with reproduction exhaust manifolds. Jack may, but I do not have information for the "SCC". Tom #24014Comment
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Re: Thanks to all
Thanks to all who responded to my exhaust manifold question. As always, I very much appreciate the good help I receive from this forum. KurtComment
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Re: Thanks to all
Thanks to all who responded to my exhaust manifold question. As always, I very much appreciate the good help I receive from this forum. KurtComment
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Re: Exhaust manifold Question
Think I sorta answered the question by giving you a survey of what kind of differences you can expect to find based on source(s) of parts (factory original, GM later service spare, reproduction). To answer the question more fully, I'd have to do weight lifting....
Many think ramshorn exhaust mani was 'Corvette only' -- not true. Used on other Chevy HP cars and ESPECIALLY on Chevy/GMC trucks of the same era. When I want a correct original part (have gone through two '036' RH manis on my '71 driver), I just stroll out to the scrap yards and sort till I find what I'm looking for. On the last go round for my '036' (cracked the base 3/4 around), I had to dig through 30 50-gal oil drums of exhaust manis. Wouldn't you know that the last mani in the last barrel was my '036'.....
Can also say that when I've looked at mani's on whole blood cars, the casting date sequence XX YY ZZ vs A YY Z corresponded nicely to source of engine casting (Saginaw/Flint vs. Tonawanda). I'll leave the 'weight lifting' to you....Comment
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Re: Exhaust manifold Question
Think I sorta answered the question by giving you a survey of what kind of differences you can expect to find based on source(s) of parts (factory original, GM later service spare, reproduction). To answer the question more fully, I'd have to do weight lifting....
Many think ramshorn exhaust mani was 'Corvette only' -- not true. Used on other Chevy HP cars and ESPECIALLY on Chevy/GMC trucks of the same era. When I want a correct original part (have gone through two '036' RH manis on my '71 driver), I just stroll out to the scrap yards and sort till I find what I'm looking for. On the last go round for my '036' (cracked the base 3/4 around), I had to dig through 30 50-gal oil drums of exhaust manis. Wouldn't you know that the last mani in the last barrel was my '036'.....
Can also say that when I've looked at mani's on whole blood cars, the casting date sequence XX YY ZZ vs A YY Z corresponded nicely to source of engine casting (Saginaw/Flint vs. Tonawanda). I'll leave the 'weight lifting' to you....Comment
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