Don't forget that installed height affects spring pressure. If the valve spring rate is 350 lb/in, and it's designed for 120 lbs open at 2.0" installed height, but you installed it at 1.80", you now have 120 lbs + (350 lbs/in * 0.2 in) = 190 lbs. So depending on valve length and spring pocket depth in the head, you could have several different scenarios.
Olds engine guys
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The heads werent touched out of the box this is the spec sheet83hurstguy said:
http://static.summitracing.com/global/i ... 2_inst.pdf
ah. Wasn't clear earlier that you have out of the box edelbrock heads on it. If they have the springs installed for 120 lbs on the seat at 1.80", I doubt that is wiping the cam... I run 125 with zero issues.
Edit: Edelbrock does make two versions... a 60519 and 60515, one has springs for a hydraulic roller cam, which will be stiffer. Sure you got the right version?
Edit: Edelbrock does make two versions... a 60519 and 60515, one has springs for a hydraulic roller cam, which will be stiffer. Sure you got the right version?
Im not sure what version of the springs he got with the heads the doc that I linked in my earlier post was all the information I could find. He only has the paper and its exactly what I linked. He is going to call Smitty today and see what he thinks about his cam failures.83hurstguy said:
After seeing all the info you gave on your problem, I would tend to agree on their being a blockage and or the restrictors are causing this issue. Restrictors should not be used for regular street driven Olds motors unless you hit 6000 rpm more than occasionally. Olds stock oiling system was second only to Chevy in GM. It's very efficient.
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The restrictors were installed when the engine was totally rebuilt 5 years ago. This is the only cam failure he has had since then. The first cam failed 8 years ago and instead of rebuilding that block my dad bought another engine WHICH I DIDNT KNOW UNTIL ABOUT 3 MINUTES AGO :lol: Then after 3 years he wiped the first 2 lobes off of the cam in that block and totally rebuilt it. That rebuild is when he changed the older Edelbrock heads with the new Edelbrock heads I showed in the link and oil restrictors were installed. This is the current combo that failed last week. Im sorry I had mixed up information when I started this thread. So it turns out now 2 cams not 3 have failed in this block and only 1 cam failed with the Edelbrocks and oil restrictors. Sorry for wasting everybody's time on thisjetsetw31 said:
Edelbrock in last year or so is when they came out with the Roller Cam version heads. So the heads you have are more then likely the flat tappets.
I also have oil restrictors in my mains.
If I were building my engine today, I would just put a roller cam in it. I would save up a little more and go that route. And any motor I build for myself in the future, will all be rollers.
I also have oil restrictors in my mains.
If I were building my engine today, I would just put a roller cam in it. I would save up a little more and go that route. And any motor I build for myself in the future, will all be rollers.
hurst1979olds said:
X2 on this. With the decline of quality lubrication for flat tappets, Rollers are the best route for longevity and well worth the investment.
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There are a few other oil system mods that can be done. I have done all that I can find for the most part and they kinda of all work together. Mine is a street car biult like a track car. I haven't had a problem with oiling system. I also use valvaline racing oil beause there is more stuff in it. I did break it in on the rottela diesel oil and an additive.
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