was moving the coil bracket to change spark plugs and I see that only 1 bolt on the bracket lines up. the two holes on the block are closer together than the holes on the bracket. do i have the wrong bracket? or do you use only one ? and if so which one front or back. and if wrong bracket any help in finding the correct one would be helpful. Thanks for any help
Offhand it sounds like somebody changed the bracket at some point. As long as the unused hole is plugged with a screw or bolt, you'll probably be ok using only one bolt to hold the coil in place. There are 2 really important things to know about those two holes: 1. if either or both are left open, expect oil to constantly dribble out of them 2. if you use a bolt that is too long (you ideally want one that is 1/2" long or even 3/8" long (if you can find one that short)...you have a push rod sitting right almost square in front of those holes and you'll ruin either or both of those push rods if your bolt tightens into them. Image below shows it...yellow pointers are your coil bracket holes and pink are where your pushrods will be sitting. And to answer the question I'm certain is running through your little gray cells...no, I have no idea which "engineer" at GM came up with this scheme. Good luck!
Last edited by Jon G; 10/15/202111:37 PM. Reason: typo
~ Jon 1952 1/2 ton with 1959 235 | T5 with 3.07 rear end
My coil bracket also has two holes, only one of which is screwed to the side of the engine. The truck appears to have been untouched until I began working on it this year. The old coil looked 70 years old to me.
Last edited by Otto Skorzeny; 10/16/20211:51 AM.
1950 Chevrolet 3100 (Ol' Roy)
1939 Packard Standard Eight Coupe (The Phantom) | 1956 Cadillac Coupe de Ville (The Bismarck) | 1964 Ford Galaxie 500 coupe |1966 Ford Mustang (Little Red) | 1969 Pontiac GTO (The Dishpit) I 1979 Ford F-100 | 1976 Ford F-150 (Big Red) | 1995 Ford F-150 (Newt)
interesting . had the valve cover off to do the valves. think i will pullit again and look at the bolts and see if the holes go thru to cause a leak or bind, thanks for the pic. hopefully one day this engine will purr like a kitten. thanks again
When I went from points to Pertonix ignition the kit came with a different coil which was larger making the bolt hole out of alignment . I opened the hole up to install the second bolt .
