Cascade Crew

aaron_sK · Posted: Sat Aug 25, 2012 1:24 pm Post subject:

Now put a motorhome behind both the 403 and the 305 and race them again! Wink

The 403 was a stump puller. With the right gearing and driver it is a good motor, but if you apply traditional muscle car logic to it (low gearing, light weight, high rpm) it's a dog.

chevymad · Posted: Sat Aug 25, 2012 3:31 pm Post subject:

Which is odd because the 403 is a giant bore short stroke motor. 4.351" bore.. largest ever in a sb v/8 with a 3.385 stroke.

Sounds good for a revver.. except the olds oiling system isnt up to the task. Only good for 5k rpm. Also the 403 had window'd mains so the crank had a habit of breaking right off the bottom of the block. It's rumored that some motor homes got non window'd mains, but nobody's ever proved it with a picture.

That said dad's 79 TA seemed to move quite well with one.

fiveoformula · Posted: Sun Aug 26, 2012 10:49 pm Post subject:

So if you had a TransAm with a 403, do they do better with some super tall gears or something?

chevymad · Posted: Mon Aug 27, 2012 6:30 am Post subject:

Alot of them were delivered with rear end ratio's in the 2.4x range. 2.73 and 3.23 would have been performance ratio's.