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At this point, it’s very probable the grind is not right.

This particular one is junk.

Burlington, Wi.

Funny you post this as this is what I have and is the issue. On the paperwork it’s p/n is 20-223-3.

Good morning. Here’s the particulars: 68 340 4 speed. 3.55 gear. 10.5 to 1 pistons. Edelbrock air gap intake, 800 CFM carb, stock HP exhaust manifolds. 2.5 inch exhaust. Thanks.

I’ve had the engine apart 3 times now verifying installation. I’ve done valve adjustment 4 times now. I’ve verified that I’m not 180 degrees off as many times now. I’ve drained antifreeze 3 times now and will be disassembling it for the 4 th time in the future. I did not find anything glaringly...

Appreciate the help. As posted here by another member, the instructions do not require the lifters to be pumped up. I did not degree the cam. There’s no adjustment capability so what good would degreeing it do? This is my last post in regards to this particular camshaft. I’m done with it. So...

If it is, they sent me the wrong cam.

No, per comp cams instructions, pumping them up is not required. I understand the help and appreciate it. I’m convinced this camshaft is bad from the manufacturer. It is coming out. Like I posted earlier, I’m not putting any more time in troubleshooting it. I’d appreciate some suggestions on a...

Yes, I know this! Well, not 100% as I don’t have compression on #1 cylinder. It’s a big zero with the compression tester. I’m done with this particular camshaft. There has to be something mechanically wrong with it. I will be pulling it out and putting it in the scrap bin. I’ve wasted enough...

I’m back to head scratching. After using RustyRatRod’s method to adjust the valves, I felt pretty confident that it was done as close to right to at least get the engine running and break in the camshaft. It sputtered and backfired at first but I did get it running. It would not stay running on...

This sounds quite easy and makes the most sense. I did use the EO/ IC method and that’s where I think things may have gone south. Pushrods are not too long nor did the valves touch the pistons. It’s not that hot of a cam. Hydraulic lifters we’re not pumped up or filled per Comp Cams...

I don’t have the specifications in front of me for the camshaft to quote lift and duration, but it is a hydraulic lifter camshaft. The method I used was what has been posted by 12many. I did back off all of the adjusters and none of the valves are bent. It’s not that high lift of a cam. I’ve...

I appreciate all the replies, even the sarcastic ones. Thanks again and I'll just call it good from here.

I have adjustable rockers. I’m questioning the adjustment procedure. What procedure have others used with success? Happy to try it before removing this cam and going back to what I removed.

I have a problem I’ve never encountered before when working on or building an engine. I installed a new camshaft (comp cams high energy) in my 340 along with a new intake and carburetor. Adjusted the valves per the published procedure then went to start the engine. Engine spun over like it had...