Originally posted by glennsexton
Greetings all:

I'm helping out a young friend with a 1977 Monte Carlo, 400 SB. Heads were toast (cracked between 3-5). He bought replacement heads - new stock 1.94s. In addition, we installed a performer manifold and a 1406 Edelbrock (replacing stock cast manifold and Q-Jet). All other components are stock. Valves adjusted 1 turn from zero lash. Starts great, idles fine and good to agout 2500, then goes flat with bogging sound. Timing is 8 degrees initial as per the book. We have the distributer plugged into the non-timed vacuum port and the trannie plugged into the timed port at the front of the carb. P/brakes on the rear port and PCV on the big front one. K&N filter in the stock air cleaner housing.

Enginge ran fairly strong before turinig into a steam cleaner.

Any suggestions would be most helpful.

Regards, Glenn in Oregon
check out that Q-JET secondaries, sounds like they are opening to soon.