Re: 2.8 punched .75 over???
First off a .075 overbore is not reccomended for any 2.8 block ,less the aluminum bowtie one. .060 is the maximum recomendation , but I would only go .030 or .040 over. But your motor appears to be .075 over(gripes!)so I wouldnt use it unless your using low compression pistions (economy). If you wish to use the 3.1 crank to stroke the motor , then you will need 3.1 pistons. The only problem with stock 3.1 pistons is they dont yeild much compression in stock forms, so Custom pistons become the only sutibale choice for increased power out put. Iwould buy a new 2.8 block, I saw one dealership with em for around $400 , and the 3.1 crank is $300 new also,and get Ross to make you some forged pistons to make a better safer stronger 2.8.