The Stovebolt Site Forums The Shop Area General Truck Talk Engine mount 1958 GMC

I’m working on a 1958 GMC 150 Napco. Truck had a 350 installed and was missing mount on frame for 336. I riveted mount on and am installing 336. Wanted to see if mount I have is correct and complete. Think it might be missing a lower metal “cradle”. See pics below. Hopefully someone can clarify this. Engine is being rebuilt and body is at the shop. I’ll post updates. I’ve completed the chassis. I took everything down to last nut and bolt.

Looks like you've got it all. Even the often missing and very hard to find upper umbrella piece (arrow in picture below). The lower mount shows up on eBay. It was used on Pontiac V8s up thru 58 and middle 50s Oldsmobiles. Here is one.

If you are nuts about a new upper piece, Steele Rubber Product$ will strip the old rubber out of yours and put new in.

I daily drove without the upper piece for 22 years with no apparent problems other than a leaking front crankshaft seal (all the stock seals leak) causing the rubber in the front mount to deteriorate.

If you are interested in fixing the front oil seal leak look here. I'll be glad to loan you my alignment tool. You'd be somewhere around the 14th person who has used it with no complaints yet.