Not if it's built right....
My opinion is you can have too large of a diameter/ freeflowing exhaust on
an Olds depending on how the motor is built. I ran open pipes (cutout
before the mufflers) on a mildly built 350 and it ran better times and
pulled better when I ran through the mufflers.
The '72 Supreme I bought back in February has a headers with a 3"
Flowmaster exhaust system.....stock 4v motor.....no get up and go until it
hits the higher rpms. Most likely I'll be putting my old 2 1/4" dual
exahust set-up on this car.
Randy's right. Thunder's 468 makes all of her power using a set of
Header's-By-Ed that are 1 3/4" outside diameter and 38" long! The 3" x 18"
long collectors dump into 2 1/2" exhaust pipes flowing into genuine Walker
Corvair Turbo-charge mufflers. The 2 1/2" tailpipes exit just before the
rear tires with the outlets pointing directly at the tread 10" ahead. It
works, gives excellent power. Too big an exhaust on an Olds will hurt power
at the low end. An Olds needs a certain level of back pressure, which
translates into high exhaust gas velocity at the exhaust port transition
from the head to the header. That in turn will pull a high suction on the
back of the exhaust valve, enabling greater scavenging of the cylinder. The
1 3/4" primary tube header does not appear to hurt the top end capability.
Milton Schick
1964 442 Cutlass
[EMAIL PROTECTED]
