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Message: <blockquote data-quote="r3dn3ck" data-source="post: 274315" data-attributes="member: 9214">If you do the overbore then pick up one of these: <a href="http://cgi.ebay.com/ebaymotors/5-4-5-4L-Forged-Pistons-H-Beam-Rods-Lightning-TMD_W0QQcmdZViewItemQQcategoryZ33620QQihZ008QQitemZ180198391184QQrdZ1QQsspagenameZWDVW" target="_blank">http://cgi.ebay.com/ebaymotors/5-4-5-4L-Forged-Pistons-H-Beam-Rods-Lightning-TMD_W0QQcmdZViewItemQQcategoryZ33620QQihZ008QQitemZ180198391184QQrdZ1QQsspagenameZWDVW</a>You'll get pistons, rings, rods, locks, pins and be basically built. You'll also need main and rod bearings and head and main studs or bolts. Remember, doing the overbore is optional. I did it and I have a motor that will hold 600hp no problem. I used probe pistons and perfect circle rings instead of Mahle P&R. Also, if you do the overbore you'll have another grand in it to get it assembled unless you have a hookup for that. If you're on a budget, just get a bone stock 5.4 bottom end, freshen it up with new bearings and a set of main studs and call it a day. Compression ratio varies based on piston selection. Flat tops yeild just a hair over 11:1 which is right at the limit for pump gas, -4.5CC gets about 10.5:1, -8cc should be around 10:1, and so on. If you post up your component specs I can get you estimated compression numbers. My motor is on -4.5cc pistons at 10.5:1 compression. It's friendly to Kalifornia's shitty shitty shitty 91octane gas and I can still run full timing. If I lived where there was E85 or 93 octane I would have used flat tops.</blockquote>