Hot Rod Forum : Hotrodders Bulletin Board - View Single Post - pontiac 350 vs 400 bb
View Single Post
  #8 (permalink)  
Old 10-27-2004, 10:08 PM
70SPORT's Avatar
70SPORT 70SPORT is offline
Last photo:
Join Date: May 2004
Age: 42
Posts: 77
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Originally posted by jimfulco
Make sure the 400 block has the same holes for the motor mounts that the 350 does. Pontiac used two different bolt patterns, and not all will interchange without adapters. Some have both patterns, so you might get lucky.

400's & 350's have the same stroke, 3.75". Pontiac crankshaft flanges changed a couple of times in the '60s & '70s, so be sure you have a flywheel/flexplate with a center hole that matches the crank on the 400.

the motor mounts are different however they make adapter plates for them that work very very well

Last edited by 70SPORT; 10-27-2004 at 11:53 PM.
Reply With Quote