by cammerjeff » Fri Aug 28, 2009 5:41 am
The early Buick V-6's were 198 ci, then they went to 225 ci in the late mid 60's, Jeep kept them at 225 for there production, and buick took them to 231 in 75 after they bought them back from AMC. It was a cost thing nothing to do with performance, at 231 ci's it could use the same rod and piston as a Buick 350 V-8!!!!
As for the Intakes, you can use any year intake before 79. The late 77 & 78 even fire motors use the same intake as the 75-early 77 odd fire motors. If interested I have a set of rebuilt 79 and up "high post heads" notheing performance done to them. still in the machine shop bags . You can have them for $50.00 plus shipping. they will bolt on to any 231 engine, I don't know about the earlier 225 engines.
I even used a early non EGR Holley intake on my High port heads, I just had alot of port matching to do, they actually cast in enough material to increase the high of the runners over 1/4"!!!!
Jeff R
1971 Catalina Freeway Enforcer
77 Astre Formula, some day soon powered by a 215 Buick V-8
1973 4-speed Lemans Safari STOCK!!!!! 1978 Catalina Safari
2006 Mallet Solstice, 6.0 LS2, 6-speed manual
2009 Solstice Coupe, 2.4, 5-speed Manual