OOOOOOOOOOOOOOOOOOOO AHHHHHHHHHHHHHHHHHH I GOTTA BUILD ONE OF THOSE.it will be a hellova lot cheaper than going through hesco.one thing though the head bolts,i thought i read that one head had 1/2 dia while the other had7/16(thinking 4.2 had the 7/16. if that is the case which bolts do you use. if you use the 7/16 you will have space around the bolt and a smaller head so that is a possible problem.but if you use the 1/2 you will have to drill and tap the block.now as a reminder i dont remember which bolt was where or even which article i was reading(read so many lol) but if im wrong let me know before i do something i will regret later.