TPITuned Port Injection discussion and questions. LB9 and L98 tech, porting, tuning, and bolt-on aftermarket products.
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89 l98 with g92 , what is the piston dish cc and the piston to deck clearance im trying to calculate my compression ratio i am putting a set of trick flow heads 23degree with 64cc , my head gasket thickness is gonna be .041in and upto 4.166 bore.
stock bottom end, i would like about a 9:5:1 to 10:1 compression ratio,
If I remember correctly the l98 heads are 64cc rated at a ~9.25:1 compression stock. I think .40 is usually standard head gasket size so unless you go with a thinner gasket you really haven't changed anything an you'll end up with ~9.25:1 compression ratio.
Mine had flattop pistons, 64cc heads, 1.94 intakes. Pistons were down around .027 inch. Factory stock engine in the 89. To do it right you might want thinner gaskets if they can be used with these heads.
