66 Dart GT HT Whatsitgonnabe?

360DartGT66 said
Ok, I just repeated my compression measurements and included the new Fel-Pro 8553PT gaskets Karl sent me. I bought a proper dial gauge and a magnetic foot a while back so this time I could actually get the piston exactly 2 mm i the hole. I also spent a little more time sealing the plate and piston-bore gap to avoid leaks.

This time around I got a compression ratio between 10.56:1 and 10:84:1.

I'm liking my car more and more. :D

I am, however, going to have to do something about this brake booster.

View attachment 1714958984

Now, my mopar performance valve covers might be a tad lower but the booster isn't even properly seated on the brackets in the picture. I think I would have to offset the booster by as much as 1/2" to make it work.

I'm sure I'm not the first to have this issue so there ought to be threads on the topic.

The rust inside is pretty visible in this pic, too.

SLot the bracket holes at the firewall end to move it off to the side about 1/4 inch, then slot the holes at the booster end of the mount bracket to move it up 1/4 inch. Should do it. The attaching arm to the brake pedal will need to be shimmed a bit, and the arm off the booster has enough play to move over a little. You may have to do a little more to prevent any binding.

I modded a setup like this for a 1960 el camino, using a 1960 chevy belair brake booster mount bracket (similar to A body one) and a GM oldsmobile cutlass metric booster with chevy S10 master cylinder, and threaded heim joints. Even used SAAB 430B overhead bin spacers between the booster and mount bracket lol.