You can also use the 3.6 inch stroke crankshaft from one of the older GM 181 cid engines with the two-piece real main seal. In 1989, GM changed the design to use a one-piece external seal similar to their V-8 engines.
You will have to use the Chevy/Pontiac 2.5 liter (151) "R" code block with the two-piece rear main seal and a distributor. These were found in pre-1985 GM rear-drive cars like the Monza, Sunbird or Fiero. The use of the 153 or 181 crankshaft might require a seal adapter...sort of two cresent-moon shaped seal halfs. Check with Billy Page Sr at 903-569-6311. Also, you will have to use the wider connecting rods on these crankshafts too as the journal is a 1.048 by a 2.100. You can machine them to accept a narrow GM V-8 small block rod.
Depending upon your budget, accessability to parts and machining, and your performance requirements, I suggest you look for engines already converted or for the race version GM/Pontiac engine...the Superduty-4. I've got suggestions but cannot openly discuss them here in the forum.
Regards,
Gerry Dedonis
dedonis@kans.com
Kansas Racing Products Inc.
http://www.kansasracingproducts.com ------------------
