Hello! I am hoping some of you Buick fans can clarify some Buick 455 timing cover swap information. Do all years of Buick 455 timing covers swap with each other??? I see Year One selling a timing cover for '67-'72, but then I see other people selling the 455 timing cover, stating that it will swap to all years that the motor was in production. Any help you can provide would be appreciated!! Thanks!! John C.
I appreciate your response! That is indeed what I am hearing from other quarters. I wonder what contributes to the years that Year One assigns to their replacement cover???? Thanks again!
It's probaby because the catalog is geared towards 64-72 cars, as the front cover states "1964-72 Skylark GS". It would make sense if they corrected the applicable years though.
I think (not sure of year) that in 71, when the suction galley in the block was inlarged, it was enlarged in the cover as well.Not sure though.
I think you are right John. '70 Stage 1s might also have an enlarged galley since they came with upgraded oiling.
So would using the later cover on the earlier block or vice-versa cause a sealing problem around the oiling passage??? Or would there just be an overlap??? If I'm understanding correctly, problems would only arise using the older covers with newer blocks................?
Hi Guys, Actually all 400/430/455 timing covers from '67-'76 are the same and will interchange. Indeed in 1971 the inlet and outlet holes for the oil pump were enlarged. You can take any prior manufactured cover and easily do the same. No matter what cover you use you should always takes a few minutes to go in the cover and the oil pump cover and "port" those passages to ease flow and help reduce chances of cavitation, this is beneficial to oil pressure and volume...much in the same way as porting your heads for additional air flow is!:Brow: I've never encountered a leakage problem by enlarging the passages either.:TU: Hope this helps....
Kerry is right about the interchangability. If you're interested in correct restoration, be aware that the later models have different timing marks than the early models.
Wow, thanks to all who responded. And to think I discover this site AFTER I sell my GS..................Oh well, thanks again! John C.
