3933198 ZL-1 intake w/hand stamp
 

Does anyone have any information showing that the factory actually hand stamped some of these intakes?? There was a page out of a book posted a while ago but I can not find it.
THANKS IN ADVANCE!! ...redvetracr

Re: 3933198 ZL-1 intake w/hand stamp
 

That is fairly common. I have one myself. On page 174 of "Chevrolet by the Numbers", by Alan Colvin, writes about that very subject.
Peter

Re: 3933198 ZL-1 intake w/hand stamp
 

At one time in the late eighties, my friend Dick Stagmo, who had bought a ZL-1 block from Red Dralle in Waterloo, IOWA, had three different 3933198 intakes.
All three were bought in the Cedar Rapids area. They were all in the same condition as when they left the factory.
One was cast the way it should be. The other one was cast as a 3933163, had the last two numbers ground off and 98 handstamped in. The third one was made by taking the 3933163 plug (is it called this?),screwing a piece with the 3933198 number on top of the 3933163, and then cast the manifold. I looked very carefully on these manifolds, a number of times, and I´m dead sure these had not been altered in any way after they left the factory.