Originally Posted by
rc007
thanks Houston, whats the difference performs wise between the two? i'm looking at getting another engine, really like the 21-5 at the minute just didn't know whether to get another or try the 21-5k ?
a really bad ass all around engine is the plus 21 block with p/s/r set #08536 installed
this set has huge vertical transfer ports and a lowered , extremely large rear main intake
(big power), but yes the 21-5k does give a little more fuel efficiency and a great powerband , even better with part #28011 turbo underhead
monty