Hello all, I'm just starting to tear down my 66 400 E motor out of my 442. It has 42,000 miles, ran well but I'm doing a full frame off on the car and have decided to do the motor also. It is a tri carb motor, my goal is to use it for cruise nights and mostly in state trips to a couple of rallies. No real race plans but I do want it to have a good thump when going through the parking lot. No budget limitations but I do want to keep it stock looking except for the headers. So, pistons, cams, roller rockers, I need some suggestions. Thanks in advance

 

I'll start out by suggesting you change as little as possible.

Pick your cam, and leave the bores and pistons alone. Ck the bearings and replace only if they need it. I'd trust factory parts over "something" available now.

It's only original once.

 

I'll start from the top down.
You can use roller rockers with the stock valve covers, just use the shorter poly locks.
I'd do a roller cam, more performance with less camshaft. Plus no concern over what oils to use.

As far as the short block I would just do what's necessary. With only 42k you might be able to get by with just a rering etc.
When you're ready for the cam etc., let me know. I can help with that.

Best of luck in your project!!

 

With 42K on an original motor consider leaving the bottom end, pistons, rings, crank and bearings alone. Put a timing chain and gears in even if you don't change the cam. Sounds like a nice project, all the best with the restoration.

 

If you do get in the bottom end, get a motor guy that knows Oldsmobile engines, not a cheby guy. Good luck on the 66.