compression on a 318

For starters 68-69 318 pistons are long gone as NOS. The rockauto replacements the PN fit a wide range of years. Because of this, they have shitty compression height numbers, so that's not the answer. Average stock 318 Pistons typically are .080" - .100" in the hole at TDC allowing then to run all day long on dinosaur piss. A set of KB167s will put it at or very close to zero deck height. With a 65cc head, and .040" headgasket you should be right around 9.5-1 . Id recommend moly rings for a street engine. They seat nicely an have good longevity. If making a nice street engine and not an all out racer, dont fall for the 2.02 - 1.60 valve setup on the teener. You want to try to keep port velocity up. With the 318 smallish bore size and stroke that it is, oversized ports and runners will kill that. Look for a set of 302 castings you can clean up for good flow, maybe open up the valve sizes a bit, but not to 2.02 - 1.60. A Weiand stealth #8022 has 318 sized runners and is a copy of the old eddy LD318. Port match everything. A stock 318 and 340 fuel pump are the same PN and use 5/16 fuel lines. An eddy 600 is ideal for this. Look into the 68 340 camshaft specs. The Melling SPD-22 is a 68 340 cam. If rebuilding this engine to stock bearing clearance specs and most of its life is spent 3500 rpm and under with occasional 6,000 rpm speeds a stock volume oil pump is more than adequate. A high vol pump will kill HP. Do the oiling mod tricks found on another fabo thread and a high vol pump isnt really needed. Look into a Kevco Claimer oil pan. It's a center sump stock pan, but has baffling and a crank scraper. An alternate if your good at fabrication and welding is to pick up the Summit racing stock oil pan, and copy the baffling that's in the Kevco pan. This setup along with a really good ignition system should easily get you to about 300-325hp give or take and have a nice smooth idle. I would also recommend ditching the cast rods on your rebuild. Eagle has a nice set of 5140 forged I beam rods that come with bushed little ends and ARP waveloc bolts for about $300 for a set of 8. These are good up to 500 hp and 6,000 rpm. Not worth reconditioning the stockers. You will spend more money, and not be as strong. Find a set of 68-71 340 hi po exhaust manifolds. Port match these too, and get a 90° oil filter adaptor off any 318 M body to run them.

I realize there are other opinions on making a hot teener, many different ways to skin this cat. This way is mine1

Hope this helps
Matt