66-67 L79 Timing chain cover timing tab

[Michael H.]

Can someone post a good picture of the timing tab on the timing chain cover from an L79/350 HP engine with 8" damper? I believe 66 and 67 are the same. (the part number for the cover is the same for both years)

[Gary S.]

Re: 66-67 L79 Timing chain cover timing tab

From my original motor 67 350 hp car

TimingMark.JPG
Picture of tab on original motor 66 350 HP car I took
TimingTab.JPG

[Michael H.]

Re: 66-67 L79 Timing chain cover timing tab

From my original motor 67 350 hp car

[Frank C.]

Re: 66-67 L79 Timing chain cover timing tab

Mike,

I took a picture of my 66 L79 Timing Cover, April 66 Build.

Frank
IMG_1669.jpg

[Michael H.]

Re: 66-67 L79 Timing chain cover timing tab

Mike,

I took a picture of my 66 L79 Timing Cover, April 66 Build.

Frank

Thanks Frank. Your tab looks exactly the same as Gary's tab from his 67, just as I suspected.

[Joe L.]

Re: 66-67 L79 Timing chain cover timing tab

Thanks Frank. Your tab looks exactly the same as Gary's tab from his 67, just as I suspected.

Michael-----


Now we need someone to post a photo of a known original 1968 L-79 timing cover and we should, hopefully, be able to learn what the difference is between 66-67 and 68.

[Michael H.]

Re: 66-67 L79 Timing chain cover timing tab

Michael-----


Now we need someone to post a photo of a known original 1968 L-79 timing cover and we should, hopefully, be able to learn what the difference is between 66-67 and 68.

Joe,

Yes, It would be good to have detail pic's of all the covers/tabs for small block 8" dampers. I think there has been a lot of confusion on these.
Could be a good article for the Restorer Magazine.

Bob Jorjorian posted a picture in a thread (link below) that appears to be a cover/tab from a 68. I haven't studied it but the tab appears to be the same as 66-67?

https://www.forums.ncrs.org/showthre...ng-Chain-Cover

[Michael H.]

Re: 66-67 L79 Timing chain cover timing tab

Michael-----Now we need someone to post a photo of a known original 1968 L-79 timing cover and we should, hopefully, be able to learn what the difference is between 66-67 and 68.

Joe,I may have just noticed something in Jorjorians picture of a 68 cover. There appears to be a rib between the bolt holes around the top section of the cover. I don't remember that rib in earlier covers??? Could that have been the change from 66-67 to 68?

Jorjorian pic of what we think may be a 68 cover below.

[Joe L.]

Re: 66-67 L79 Timing chain cover timing tab

Joe,

I may have just noticed something in Jorjorians picture of a 68 cover. There appears to be a rib between the bolt holes around the top section of the cover. I don't remember that rib in earlier covers??? Could that have been the change from 66-67 to 68?

Michael-----


Yup, that's the difference. The impressed rib pretty much extends over the entire flange of the cover between the bolt holes. It can also be seen in the photo that Dave L. posted in another thread of a 1968 cover with tab set for a smaller balancer. I'm sure this was done for improved sealing. The same sort of change was made to waterpump backing plates in the later 60's. I can say that based upon my own experimentation that this change to the waterpump backing plates greatly improved sealing.

[Michael H.]

Re: 66-67 L79 Timing chain cover timing tab

Michael-----


Yup, that's the difference. The impressed rib pretty much extends over the entire flange of the cover between the bolt holes. It can also be seen in the photo that Dave L. posted in another thread of a 1968 cover with tab set for a smaller balancer. I'm sure this was done for improved sealing. The same sort of change was made to waterpump backing plates in the later 60's. I can say that based upon my own experimentation that this change to the waterpump backing plates greatly improved sealing.

Joe,

Ok, that makes sense because the 68 timing tab looks identical to those seen on 66-67 covers for 8" dampers.

So we have one design tab for 62 to early 64. Another for later 64-65 and a third for 66 to 68.