Also, using the 6x-4 heads on a 400 will require milling the heads a lot and zero decking the block in order to get the compression to a decent level. Most people don't recommend using pop up pistons. When I built my 400, I elected to go with a early casting, 72cc iron head and a TRW 2262 pistons with a 12cc total dish to put the compression where I wanted it. Low 13's will probably reguire some chassis mods to get it to hook good enough. I'm really happy with the way my mild 400 runs. Speeds are right around 104 mph, but my best et is a 13.70 due to poor traction. Jmho
Chris
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