[KTL]

I agree with Alphie. The Wayne Dempsey high lift cam timing method doesn't work with the bolt-end cams. You can't counterhold the crank and move the cam because there's nothing you can use to turn the cam!

Here's how I did it:

1. You can use the bolt that secures the sprocket to the cam IF you must turn the cam in the clockwise direction to achieve the desired lift measurement. If you must turn the cam in the counter clockwise direction, this obviously does not work because the bolt will loosen. The key here is to start out your timing process such that when you get to TDC overlap, you find that you are deficient in lift (dial indicator reads less than desired) and you must turn the cam clockwise to gain lift. So instead of setting the cams with the 930's up to start, maybe turn them a wee wee wee bit counterclockwise.

2. Disobey Wayne's method of holding the crank and turn the crank the direction needed to get nearer your lift measurement. I believe Wayne's recommendation to hold the crank and move the cam is due to the possibility of the cam moving on account of the force of the rocker arm acting on it. With the DC 20 cam profile, I did not find that the cam wanted to move when setting the timing. I'm a complete weirdo and have to do things way too many times before being satisfied with my results. Point being, I set and reset and re-reset the timing many times and not once did the cam move on its own under spring pressure.

I had hoped to devise a tool to allow us to rotate the cam in either direction when setting the timing. First I simply tried using a M12x1.5 nut to use as a jam nut with the cam bolt. Turns out the cam bolt is a bit too short and I couldn't get enough thread engagement inside the cam with the jam nut on the bolt to feel comfortable tightening the jam nut. The next step would be to get a longer M12x1.5 bolt to gain more thread engagement. Well I was running of time and did not have the opportunity to get another bolt and see if this would work. Maybe next time.......

Another thing to note on the DC 20 cams. I had a problem setting my cams to the desired 2.2-2.4mm lift at TDC overlap. I could not get adequate piston-to-valve (P-V) with it set at 2.3mm. I only had about 1mm, minimum is said to be 1.5mm. So I ended up backing off the lift to 1.85mm to get good clearance. Hopefully my case was a rarity and others do not have this problem. Point being, BE SURE TO CHECK YOUR P-V CLEARANCE WITH THESE CAMS, ESPECIALLY WITH STOCK MOTRONIC OR CIS PISTONS. I think pistons with the valve reliefs are a wise idea, especially if you're building a bigger displacement engine like a 3.4 or 3.2 short stroke.

And you must check the P-V elsewhere besides TDC overlap. My closest clearance location was at a crank angle maybe 10 degrees past TDC