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Re: engine suffix code ID questions
Interesting, Ray...
FYI On page 379, Noland's book lists a '66 Corvette 194376S104092 with engine assembly stamp as T1013IK; and Block Casting Date J15. I saw no "ID" or "IK" entries in Noland's '67 survey data (pages 444 & 445).
Assuming no typos or errors on the person who submitted this to Noland or its entry into the book, the engine assembly date (Oct 13th) is impossible because it is two days BEFORE the block was cast (Oct 15th). Note that Letter "I" was used for block casting dates for the '66 model year.
So with the reported "IK" code, was this a transplant from a full-size A.I.R. Chevy to a Corvette ?
Or is this survey result "questionable" because of the two anomalies ?thx,
MarkComment
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Re: engine suffix code ID questions
All------
One other thing of note: engine suffix codes are specific to an engine configuration as shipped from the engine plant. Even small changes in configuration, usually specific to a particular vehicle, result in different suffix codes.
Generally speaking, the primary difference in engines destined for a Corvette versus other Chevrolet models involves the exhaust manifolds and distributor. So, in most cases, engines destined for a Corvette will have a different suffix code than an otherwise identical engine destined for some other Chevrolet model. However, in the case of L-72 engines installed in 1966 passenger cars and, presumably, any L-72 installed in a 1967 passenger car, the exhaust manifolds were the same as Corvette.
However having said all this, if any L-72 engines were installed in 1967 passenger cars then those were the only 1967 L-72 engines built because no other 1967 Chevrolet model was available with an L-72.In Appreciation of John HinckleyComment
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Re: engine suffix code ID questions
Joe,
You are correct, no LS-7 engines ever made it to production, but engine components were available for purchase over the counter.
It seems to be fairly well established that for 1967 a total of 11 L72 427 engines were committed to production - further documentation that they were installed in a full size Chevrolet passenger car is not available to support this. The engine code " ID " was used for 1966, 67, and 68.
However, if an article as provided by Hemming's is to believed in Sept -2018, the engine was released for production in late March of 1967. They also featured a 1967 SS 427 with the L72 code ID which appears to be correct, but again can not be verified. Even Alvin Colvin offers a comment that it appears original. As it seems to me, very possible that one or more of these engines could have been eventually installed in a full size Chevrolet.
Mark,
The Corvette Black Book does list an engine code " IK " for 1966 Corvettes - 427ci, 425hp, mt.
Thanks,
RayComment
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Re: engine suffix code ID questions
[QUOTE=Joe Lucia (12484);933777]All------
One other thing of note: engine suffix codes are specific to an engine configuration as shipped from the engine plant. Even small changes in configuration, usually specific to a particular vehicle, result in different suffix codes.
Generally speaking, the primary difference in engines destined for a Corvette versus other Chevrolet models involves the exhaust manifolds and distributor. So, in most cases, engines destined for a Corvette will have a different suffix code than an otherwise identical engine destined for some other Chevrolet model. However, in the case of L-72 engines installed in 1966 passenger cars and, presumably, any L-72 installed in a 1967 passenger car, the exhaust manifolds were the same as Corvette.
Joe: I have pictures below that contradict your statement. 1st pictures are from the AACA Grand Nationals. Picture show a
1966 Chevrolet with L72. Car had all the paperwork and was a proven and bona fide winner. Please note the Passenger Side
Exhaust manifold and compare it to a 1966 Corvette L72 exhaust manifold.(Bottom Picture) You can see the difference on where the front
cylinder combines with the next cylinder. There are other differences but hard to see. Please comment on this. Thanks Joe>
LarryLarry
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Re: engine suffix code ID questions
[QUOTE=Larry Evoskis (16324);933795]
Larry-------
I do not see the difference you described. In any event, 1966 L-72, passenger car or Corvette, were equipped with exhaust manifolds GM #3880827, left, and GM #3880828, right. Those are the manifolds you pictured and are the ones on the passenger car pictured. I suppose it's possible that very early 1966 L-72, passenger car or Corvette, could have been equipped with the 1965 Corvette and passenger car L-78 exhaust manifolds, GM #3856301/3856302, but that's strictly a guess on my part. However, that DEFINITELY did not occur for the passenger L-72 you pictured. The 1965 manifolds do not have the "flat" on the top of each runner which can be clearly seen in the photo you posted. So, this car has the 3880827/3880828 as it should.
By the way, no 1966 L-72, passenger or Corvette, was equipped with AIR regardless of where delivered.In Appreciation of John HinckleyComment
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Re: engine suffix code ID questions
[QUOTE=Joe Lucia (12484);933797]Joe;Thanks for your comments. If you look closely on the L72 Full Size Chevrolet you can see that that the front
cylinder connects to the 2nd cylinder "right at that webbing shown". On the Corvette Manifold the front cylinder
connects to the 2 cylinder a little way further down the line. At any rate we know that all Corvette Engines received
a "factory engine setback"; the full size Chevrolet did not THUS>I do not believe that Corvette manifolds would have
enough room to clear the "crossover frame"area being that the engine is further up in the car. JMHO>LarryLarry
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Re: engine suffix code ID questions
[QUOTE=Larry Evoskis (16324);933799]
Larry-------
According to GM and my own experience, all 1966 L-72, Corvette or full size passenger car, were equipped with the GM #3880827, left side, and GM #3880828 right side exhaust manifolds.
The right side manifold on the car you picture looks like a GM #3880828 to me. However, I cannot see most of the manifold because it's obscured by the heater hose in the photo. It's possible that it's actually a GM #3884504. I think it's highly unlikely it's that manifold but I suppose it's possible.
However, if it is a GM #3884504 and regardless of the provenance of this car, then it's absolutely incorrect for the application. Period. The 3884504 was used for 1966 passenger cars with L-35 and L-36 and NOT L-72.
Other than the manifolds I mentioned and based upon what I can see of the manifold, there is no other manifold that ever existed that this car could be equipped with.In Appreciation of John HinckleyComment
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Re: engine suffix code ID questions
[QUOTE=Joe Lucia (12484);933805]Joe: Found picture of this car of the Drivers Side of the L72. Does not look like a Corvette Manifold to me as the 1st(Front)
runner is more level than a Corvette Manifold. Note: Car is so accurate one can see the added safety cable added due to
recall from GM as they where having motor mount problems during this time frame. LarryLarry
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Re: engine suffix code ID questions
[QUOTE=Larry Evoskis (16324);933811]Larry-------
It looks like a GM #3880827 to me but I can't see it that well in the photo. The only other manifolds that existed at the time that it could possibly be would be the GM #3883999 or GM #3892307. But, as I said before and regardless of the provenance of this car, if it's either of those it's incorrect for the car. Period.In Appreciation of John HinckleyComment
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Larry
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