Purchased a new double roller speed set.

Have it with me and am about to replace my chain on my 72 Chevelle tomorrow because mine has never been replaced and I believe is worn or have jumped. Posted earlier questions on here and have heard this may cause my problems so I already have a new one... why not replace it?

Anyway, I have read but have some questions: Are you supposed to align it to TDC on the compression stroke for the #1 Cylinder and then align the dots (6 o'clock on cam, 12 on crank) with the chain and go from there? Or would that classify being 180 degrees off because 6 o'clock on the chain isn't at TDC for the #1. Wouldn't that be the #6 and then it would have to be rotated (crank) 1 more revolution for them to align at 12 on both for the number 1 cylinder on the compression stroke...? Pretty confused on this. I'm sure someone here can help me with an easy answer. I believe I know what to do but more info would help me a lot.

Any info would be great on how to do this.

Or, do I just rotate the crank by hand and then align the dots and then redo the ignition timing or whatnot? First time doing this. Seems easy, but definitely don't wanna make a mistake. Thanks for the help.

1972 Chevelle 350. New Cloyes double roller speed set

I haven't slept in 35 hours... may contribute. Working way too much with school everyday trying to fix cars just doesn't work out too well without sleep. Thanks, look forward to responses tomorrow. Goodnight all.

Both dots at 12:00 is how they should be, if I remember right. Then, I roll the motor over by hand to see if the dots are point at each other at 12:00 and 6:00, since its kinda hard to see if you have it exact going off of the dots at 12 and 12.

Align the dots with the cam at 6 o'clock & the crank at 12 o'clock, this has the #6 cylinder at TDC, then rotate the crank 1 revolution, then you will have #1 at TDC, I always rotate the engine a couple of times and double check to make sure that they are lined up.

Align the dots with the cam at 6 o'clock & the crank at 12 o'clock, this has the #6 cylinder at TDC, then rotate the crank 1 revolution, then you will have #1 at TDC, I always rotate the engine a couple of times and double check to make sure that they are lined up.
Not exactly. BOTH 6 and 1 are at TDC. The question is whether one or the other is at TDC Compression or TDC Exhaust.

With the dots together (6 and 12 o'clock) #6 is at TDC Compression, #1 is at TDC Exhaust.

With the dots both at 12 o'clock, #1 is at TDC Compression, #6 is at TDC Exhaust.

Put the chain on with the dots at 6 and 12 for ease of alignment. Then rotate the crank 360 degrees and align the distributor for firing #1.

Align the dots with the cam at 6 o'clock & the crank at 12 o'clock, this has the #6 cylinder at TDC, then rotate the crank 1 revolution, then you will have #1 at TDC, I always rotate the engine a couple of times and double check to make sure that they are lined up.

+1


Also, if you haven't pulled the distributor it will still be correct when the new chain is installed.

first thing line up the gears, lower at 12 and upper at 6. note where the rotor points and index the distributor position to the block before removing the distributor. then put it all back the same way and you won't have to check anything else except reaffirming the timing is correct.