hi i just had a p90 head installed onto my L28 and noticed that on the side of the head it has P90A. This head has mechanical lifters , i was under the assumption that P90 A heads were all hydraulic. is this true?

I was under the assumption that all the P-90A's used on ZX's were hydraulic, but, is it possible the head came from an L-series that wasn't used in a Z?

dunno, is it possible to convert hydraulic lifters to mechanical lifters?

it seems that a few of the p90a head were with mechanical lifters. while most were with the hydraulic lifters. the reason for this is unknown to me anyway