[Rowdy Rat]

Bradley,

General Motors submitted the following specifications to the AMA in 1970 and these figures appeared in the February/March 1970 issue of Corvette News as well:

#3972178 (LT-1)

VALVE LIFT

Intake - .4586" (includes lash - .024")
Exhaust - .4850" (includes lash - .030")

(rocker arm ratio of 1.5 to 1)

VALVE TIMING

Intake
Opens (BTC) 42
40'
Closes (ABC) 94
20'
Duration 317


Exhaust
Opens (BBC) 112
50'
Closes (ATC) 53
23'
Duration 346
13'

Regards,

Stan Falenski