Join Date: Apr 2004
Location: Hammondville, Sydney
Ther used to be a kit which took the 4.1 to about 280 c.i , but really to me it seems ridiculous. The 250 already has a long stroke- 99 mm - and has trouble making much power past 5000 rpm. You can't bore the motor much, as you end up having trouble with head gaskets, cracked bores, etc. The less boring the better. Just work on good cam, compression, exhaust, intake,etc with a N/A eng. , or spend the big dollars and go for a turbo or blower. Lower gearing will also help acceleration a little....