Hot Rod Forum : Hotrodders Bulletin Board - View Single Post - Engine Swap question...
View Single Post
  #6 (permalink)  
Old 06-20-2013, 12:43 PM
66GMC's Avatar
66GMC 66GMC is offline
Get in, sit down, hang on

Last journal entry: Cab Removal
Last photo:
Join Date: May 2005
Location: Olds, Alberta Canada
Age: 59
Posts: 2,764
Wiki Edits: 0

Thanks: 33
Thanked 94 Times in 89 Posts
I'm thinking that an '89 truck engine SHOULD still be a Mark IV series BBC, which would also likely have the "peanut port" heads on it, which is OK for bottom-end torque, not so good for higher RPM.

I'd further suggest that you get the block and head ID's and head over to mortec or to decode them, so that you know what you're starting with.

The popular swap is to swap to the large oval-port (OEM cast) or aftermarket aluminum cylinder heads.

Rectangular-port heads were also used on this engine, but unless you're planning on huge horsepower / RPM ... most will tell you that you're better with the oval-ports.
Reply With Quote