[Norm reynolds]

I know that this is off the beaten path but when did GM put the partal vin and engine code on top
I have a friend that has a 66 vette 327/350
he had it redone a flew years ago I could not find any numbers by the oil filter only up top right side by the heads
he is the original owner and tells me he got the car in late june of 66 but when I did the engine code it comes in as jan of 66 he allso said that the guy that did the car was doing two other vette at the same time and he thinks he has the worng parts When I drove it hard if felt more like a 300 hp than a 350hp The numbers realy look like a restamp of the vin
but I did not have the heart to say any thing
Norm