new 360
Mike;
shallow dish pistons are for the larger chambers, and as the years have gone by, when the chambers get smaller, the dish gets bigger.
I believe this is more of a factory thing. Combining different cc heads with diferent cc dished pistons to aquire the desired comp. ratio is what it is all about.
Also the purchase of new pistons and where they'll sit in the hole combined with the head cc amount. Stock head or other.
The problem is finding 68cc heads ...exact. The closest factory heads I can think of would be Magnums. Reguardless.
The use of stock pushrods can be possible so long as you understand there "Pushed" into the lifter at a predetrermined amount. The approx. depth of the depressing is .050. So If you mill the head .030, your left with .020 worth of play. It would be wiser to get pushrods the like amount milled shorter. It's an easy pick up/order.
(Also take into account the gasket thickness in the pushrod length and compression ratio.)
If 440 (Big block in general) were the same as small blocks, would they not have the same part number? But they do not do they?
Indy cyl. heads uses 440 rockers on there small block heads for geomentry reasons. There must be a change in the rockers then right?
If you want to upgrade your rockers, a basic upgrade is the HD stamp MoPar rockers @ approx. $80. Then theres rockers from Comp Cams, Crane, Harland Sharp and others that are adjustable. They require a cup instead of ball end for use.
(I do not have a code book handy for the block numbers.)