My 406 is a two bolt with splayed 4 bolt mains, I plugged the steam holes in the block and zero decked it.I run thermal coated SRP flat top pistons, 5.7 rods,coated combustion chambers,Comp cams X-treme mechanical roller,Jesel shaft rockers,Edelbrock Victor jr.heads, Bowtie intake,Chuck Gulledge Holley reworked to 830cfm.I also run a crank scraper,windage tray,and lifter valley baffle. I haven't got the truck finished but it seems to make sick power on test runs in front of the shop.I'm guessing 560h.p. or so. My last 406 also had the steam holes plugged,with no problems whatsoever. I had sprayed probably 15 bottles of NOS at a 150 shotat the strip,drove it to Tennessee 3 times,and it was my only driver.It never failed.These are the only small blocks I'll ever own,unless we go 427 or 434 in the future.
