I was talking to a friend at school today. He's a pretty heavy hitter in the Chebby racing field. We were talking about my build and he has concerns about the fuel pump arm being so close to the double roller timing chain (it's got 1/8, maybe 3/16 of an inch). He said chevys get a lot of cam walk and he always welds a button onto the inside of the timing chain cover. I seem to remember someone (possibly MDchanic) saying that the counter-clockwise rotation of the dist. puts a rearward force on the cam, keeping it in place. Should I be concerned?

 

No.

 

x2-no

 

No, and I'll help your concern with this.

My 1967 330 that is going in my Delta is stock. No manifold, carb or brackets came with it, so that is my upgrade list. It's a hi comp motor with the 10.25:1 CR. I do have the correct "WG" heads on it.

I replaced the timing chain with a double roller. Miles unknown on motor, but the chain was so streched it was off by maybe 1 or 2 degrees of timing, when I removed the cam spocket, the cam did move, a lot, maybe 1/8 of an inch.

The valley where you can see the cam, when the cam was pulled out, I saw no wear where the lifter was touching the cam, also no marks, scorning, etc on the fuel pump arm, fuel pump thingy (I know the name, just can't spell it) or timing cover.

Chevys have "Cam Thrust plates" that you can put behind the cam sprocket, Oldsmobiles do not, due to the cam is pulled into the block and not pushed out like on a Chevy

 

Eccentric? Lol.
Thanks everyone!

 

Also, the cam bolt, one bolt centered, unlike Brand C motors, has a protrusion that clears the timing cover by a few thousandths of an inch, so even if the cam tried to go fwd... it cannot.

 

Well that pretty much answers that then, doesn't it. Thanks Octania.

 

Just got back from work.

Yeah. What all of them said.

- Eric

 

Thanks Eric. Working late?

 

Naah. 12 hour day, with an hour commute each way. At least I got out in time today.

- Eric

 

Oh, is that all.

 

One more thing, most all flat tappet cam lobes are ground with a taper that helps keep the cam against the block. No need to worry.

 

Well since you ground my cam, I'll take that as gospel. Thanks fellas, I'll pass on this info to my buddy at school.