The Stovebolt Site Forums The Shop Area Engine Shop which key way do i use

i have a double roller timing chain set for my 350 chevy (PO put it on so i have no directions and don't remeber how it was when i took it off... i know shame on me) the crankshaft gear has 3 key ways in it each with the own mark O, A, R, and if you count 4 teeth counterclockwise from each key way theres the matching mark (ex. count 4 teeth counterclockwise from R key way theres the R mark) and the gear also has 2 DEG stamped in it i can draw picture if needed but don't have the time at the moment

Nate

Hy OldIronChevy, I am attaching a picture of the Chev. V8 timing chain and gears, note the position of the cam retaining bolts, and the crankshaft keyway relative to the timing marks, this is the straight up factory timing, hope that helps.

http://i120.photobucket.com/albums/o178/pintos4me/timingmarks.jpg

"0" is straight up factory timing.
"A" is advanced, usually 4 degrees
"R" is retarded, again often 4 degrees.
The advance can help compensate for a worn chain and gears but the racers are the ones that utilize the advanced or retarded cam for dialing in the power in the range they want it.

Go with the "O" it is what ya want

thanks for the help guys i appriciate it, i figured A and R meant advance and retard i will just go with stock timing which is what i planned on but figured i'd double check and i couldn't remember if you wanted the two dots next to each other and inline or both dots at the top of each gear and inline

thanks again
Nate