chey's forever
New Member
Hi: Does anyone know the cam lobe lift on a Z-11 cam in a 1962 086 block, it's not a stock cam. Thanks
cam lift
- Thread starter chey's forever
- Start date
Yep. As Don said, the 583 heads are designed to accomodate that valve lift. If you use the 'Z11' cam in the 690 heads, the retainers will stack up against the tops of the valve guides. Shortening the tops of the guides allows that cam to work with the 690's.
Years ago, I did a 409-425 for a restoration project. Ran fine, no issues. A few months later, the owner called me and said the engine had developed, as he termed it, ".....really bad problems." When I asked him if he'd done any tinkering to it, he said he hadn't. I went to his place to check it out and could see right away the valve covers, intake and front timing cover had been off after he took delivery of it from me. When I asked him what the deal was, he sheepishly confessed to putting the Z11 cam in it after he had driven it for a while.
The retainers were whacking the top of the guide bosses on the 690 heads. For what it's worth.....
Correct.
The L31 got you the 400hp. The L31 and L80 got you the 425.
So Al, did you fix it? Or did you just tell him where his failure was, besides not being forthright and disingenuous to your question?Yep. As Don said, the 583 heads are designed to accomodate that valve lift. If you use the 'Z11' cam in the 690 heads, the retainers will stack up against the tops of the valve guides. Shortening the tops of the guides allows that cam to work with the 690's.
Years ago, I did a 409-425 for a restoration project. Ran fine, no issues. A few months later, the owner called me and said the engine had developed, as he termed it, ".....really bad problems." When I asked him if he'd done any tinkering to it, he said he hadn't. I went to his place to check it out and could see right away the valve covers, intake and front timing cover had been off after he took delivery of it from me. When I asked him what the deal was, he sheepishly confessed to putting the Z11 cam in it after he had driven it for a while.
For what it's worth.....
So Al, did you fix it? Or did you just tell him where his failure was, besides not being forthright and disingenuous to your question?
He opted to pull the heads and have the guides shortened. At my suggestion, he also replaced the retainers and locks. Somewhat in his defense, he was assured there would be no issues using the Z11 cam by a big name 409 parts supplier. Whether they had all the info...who knows?
Back when I was looking for Springs for my camshaft I called Comp to see what was best for my set up and 2 of their techs were wrong. I spent a bunch of time trying to learn as much about these motors as I can because I truly want to understand their nuances. After I did the math and it never matched their springs I decided to consult the local machine shop and they confirmed my fears and I bought the correct springs. My 690's have had some work done to them and when selecting my springs that machine work had to be considered to ensure proper fit/performance. The only real issue here is a builder unfamiliar with a specific engine should have taken more time to measure and ask the experts, not a parts supplier.He opted to pull the heads and have the guides shortened. At my suggestion, he also replaced the retainers and locks. Somewhat in his defense, he was assured there would be no issues using the Z11 cam by a big name 409 parts supplier. Whether they had all the info...who knows?
Did late April 1962 update include all the 425 hp parts? I've been told the exhaust manifolds were updated but was the cam changed?