427 LT5 Build 2 underway

[tpepmeie]

Here we go, guys. Thought I would make a new thread to document build 2. The target is 800 bhp, @ 7400 rpm. Some upgrades from the previous version (700 bhp/6900):

• New larger inlet valves (41.5mm v. 39.5mm)
• Higher compression ratio
• Billet aluminum mono blade throttle body
• New cams...maybe

Here are two links to other discussions about Build II.
http://www.zr1.net/forum/showthread.php?t=23894
http://www.zr1.net/forum/showthread.php?t=23537

I was never really happy with the ring seal on the first build, both from a blow-by and oil control perspective. So, we're now using new pistons, a different bore finish, and new rings. These pistons (430g) are a bit heavier than the featherweight CP forgings I used in build 1, so the crankshaft will need rebalanced. The intention is to get better stability of the piston in the bore.

Ross Custom billet pistons. 14:1 / Flat Top / .140" deep valve pockets made from a mold of my combustion chamber. These valve pockets will accommodate more than .550" valve lift if I decide to go there...

.043/.043/3mm Total Seal rings