Thread: Motor selection

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there not much to good about the V block other then it may not be to hard to find stock heads are poor and no justable rockers there open deck .the bowtie cnc block fix some of this closed the deck down .made it so it could take a two pc seal cranks and older heads.pc adapter bolted in to the block as for the mark 5/6 having a 4 bolt main that fine and you can run a two pc seal cranks in the stock mark 5/6 with the seal adapter .you can buy the ARP 7/16 to 3/8 studs for the heads but i just drill and tap for 7/16 top and bottom rocker studs. i would not over look the mark 4 block two bolt block have put alot of power thru one of them blocks then i would trust with a mark 5 block. mark 6 has the stands to mount a cheaper GM hyd roller lifter then a retro roller lifter for the mark 4/5 blocks .i built both mark 5and 6 blocks there ok if you have nothing i have had the cnc mark 5 blocks. i mix and made thing s fit them but for someone starting out you need to watch out for parts that may bolt on but will not work on the 5/6 blocks . after all this i should say i have built the 5/6 way past 650hp there just not on the top of my list for hi HP with the open deck bores moving and head gaskets failing but have not had this happen on the ones i did .i just do not like the open deck and other things as well ....for mild builds they are fine if thats all you have to work with