Engine decifer
Thread Starter
Heel & Toe
Joined: Jun 2005
Posts: 15
Likes: 0
From: St. Boni MN
Engine Serial Numbers
My folks have a 1969 convertible. The problem is the engine numbers do not match. Engine is supposed to be the 350/350 setup.
Here are the numbers we found on the block.
TO 0625HN
18J302353
82396124
We figured out part of it, like the first few. June 25 Topeka. All I could figure out on the second is 1 = GM, 8 = 1968 J = ?
What does the rest mean? What do the 350 HP motor numbers look like? We thought it was a 327 C.I. motor.
Here are the numbers we found on the block.
TO 0625HN
18J302353
82396124
We figured out part of it, like the first few. June 25 Topeka. All I could figure out on the second is 1 = GM, 8 = 1968 J = ?
What does the rest mean? What do the 350 HP motor numbers look like? We thought it was a 327 C.I. motor.
Last edited by D.T.; Feb 9, 2008 at 08:23 AM.
Team Owner
Joined: Sep 2006
Posts: 31,172
Likes: 4,250
From: Westminster Maryland
DT,
I've tried to find some info about your engine numbers without any luck.
I don't see any 68-69 Corvette suffix listed as HN. The only HN suffix I can find is for a 1965, 327, L84 engine. That was the 375 horse FI engine. As for the block casting numbers all 68-69 engine numbers were 7 digits, all beginning with 39..... .The number for the 65 HN block would be 3782870. That's all I know, sorry.
Regards,
Alan
I've tried to find some info about your engine numbers without any luck.
I don't see any 68-69 Corvette suffix listed as HN. The only HN suffix I can find is for a 1965, 327, L84 engine. That was the 375 horse FI engine. As for the block casting numbers all 68-69 engine numbers were 7 digits, all beginning with 39..... .The number for the 65 HN block would be 3782870. That's all I know, sorry.
Regards,
Alan
Safety Car
Joined: Feb 2006
Posts: 4,855
Likes: 2
From: Columbia South Carolina
My NCRS book says the 69 350/350 should be a 3927187 casting. cant find a J code except for assembly plant which would be Janesville. maybe you could find out what kind of cars were made there?
wait, thats the intake manifold casting number. Block could be either 3932386 or 3956618, then it says "late small blocks" 3970010, but no HP designation.
wait, thats the intake manifold casting number. Block could be either 3932386 or 3956618, then it says "late small blocks" 3970010, but no HP designation.
Last edited by 454_71Stingray; Feb 10, 2008 at 03:18 PM.
