Quote:

my boss has a 73 duster that he drag races . has a 400 block stroked to a 472. its an alcohol motor. now the problem he is having is new to me . after 3 1/8th mile passes the intake valley pan split down the middle. its about a 7in crack right down the center . this is one of the most bizzare thing ive ever ran into. any ideas on this one???



Pretty simple really... he is pressurizing the engine
with blow by... the crank case is building pressure
from the air passing the rings... put a gauge on
a valve cover to measure the pressure... a vac pump
will eliminate/correct the problem