Not Ranked
Oliver,
the 6005 (9) head IS for 428 and has the smaller valves, also a smaller (72cc ) combustion chamber. The 6007 is the complete assembled version of the bare 6008 which has 76cc chambers and can be machined for the larger 427 valve size, the 6005 cannot.
Cross bolted mains means the center three main caps have extra, external , horizontal bolts to add strength, you can see three bolt heads at the bottom of the crankcase on either side if the block is crossbolted. Some 427 center oilers and late 406s where crossbolted, most not.
And NO, YOU CANNOT remove the pistons from below.
Mike
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