Old Man with a Hat
FCBO Gold Member
- Oct 8, 2011
- Reaction score
Quick update on the TNT.
As a first fix to get the cooling going, I had bought (and @david hill had installed) a Spectra Premium CU332 radiator in the spring. The idea was to have a brand new radiator in the car so it could be driven, while we looked for a good shop to recore her original 2998970 radiator. David found the right person and dropped off the rad two weeks back. Good news, he got the 2998 970 radiator back yesterday. After painting, it will be reinstalled this coming week. The (now almost) new CU332 will replace, to improve cooling at rapid highway speeds, a similar unit in Buttercup, my 1972 NYB, whose radiator is not original anyways (it likely is an old CU332 -- looks like it).
David also will be installing new manifold cover gasket. I bought the last 1968-71 Big Block C-Body Exhaust Manifold
Fastener Kit (for HP BB 383 440 engines) from 521 Restorations on eBay to that effect:
View attachment 493484
I also got from Summit three Mahle F5561K exhaust pipe flange gaskets, and a Fel-Pro MS90029 exhaust manifold gasket for U-code engines
I find 521 Restoration's choice of grades for the studs and nuts to be curious. Most of my experience with problems with exhaust manifold mounting hardware is that the nuts usually rust solidly to the studs over many decades of use. That usually results in one or more studs that shear off when trying to turn the nuts off the studs - which could necessitate taking off the heads to be able to replace the studs. I would have thought the studs would be grade 8 (harder to shear off) and the nuts grade 5 (softer to allow them to turn off easier). Is there an issue with the grade 8 steel (maybe because of higher carbon content) to cause more rust and the nuts would turn off more easily being grade 8 and the studs to be grade 5 or what do you think?
Maybe with a good coating of anti-seize compound on those pieces though, this might not be a big problem. After many hours and time in such a hot environment, though, I also wonder just how long/effective the anti-seize compound would remain in place and continue to be effective??