Cam and valvetrain longevity....??? low duration high lift...
#922
Registered
I have a cam here that has track marks on the lobe. It is an 8620 core. Now, this cam was mocked up in the block. Spun by hand with checker springs on two valves. I never noticed it until yesterday when I pulled it out of the box and looked at it. This cam wasn't spun (by hand) more than a dozen times when I was setting up the shaft rocker stands. How could this brand new cam have track marks on it? This is in a $4,000 block that was CNC machined to perfection with a $2,000 set of Jesel lifters and checker springs that I installed on the valves with my fingers= 0 spring pressure 0 rpm. What is gonna happen when I go and throw a big boy valve spring on and spin this thing 7,000 rpm?
#923
Geronimo36
Gold Member
We keept our Fountain in Middle river on a lift. We were out every weekend. Pretty much rafted up at Still Pond every Saturday and Sunday. Gave the heads to a friend of mine who never used them. I have two more sets of those same heads if you know anyone that needs heads.
#925
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I have a cam here that has track marks on the lobe. It is an 8620 core. Now, this cam was mocked up in the block. Spun by hand with checker springs on two valves. I never noticed it until yesterday when I pulled it out of the box and looked at it. This cam wasn't spun (by hand) more than a dozen times when I was setting up the shaft rocker stands. How could this brand new cam have track marks on it? This is in a $4,000 block that was CNC machined to perfection with a $2,000 set of Jesel lifters and checker springs that I installed on the valves with my fingers= 0 spring pressure 0 rpm. What is gonna happen when I go and throw a big boy valve spring on and spin this thing 7,000 rpm?
#926
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Join Date: Sep 2007
Location: Clarks Summit, Pa.
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after reading this post I am not feeling too good with my MK cams. I just got a heads and cams package specked from MK 2 months ago and numbers are not than much off of Tim's. thought I was doing the right thing going to MK spent to me was a lot of money building my 540's. my motors are almost finished and I may end up with a couple of 540 stones for the money I spent. that sucks. my grind # is XA242-390/247-385/112+4 core# 315629 actual on cam card reads 242.2 .664 247.1 .656 325 AFR heads
#927
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after reading this post I am not feeling too good with my MK cams. I just got a heads and cams package specked from MK 2 months ago and numbers are not than much off of Tim's. thought I was doing the right thing going to MK spent to me was a lot of money building my 540's. my motors are almost finished and I may end up with a couple of 540 stones for the money I spent. that sucks. my grind # is XA242-390/247-385/112+4 core# 315629 actual on cam card reads 242.2 .664 247.1 .656 325 AFR heads
#928
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Join Date: Mar 2008
Location: Vancouver BC
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I like this cam for a sub 6000rpm 540. Very strong midrange and carry's the torque through the upper rpm so you can swing a decent sized wheel. Depending on exhaust peak hp should be between 5600 - 5800 with those heads.
http://www.lunatipower.com/Product.aspx?id=3153&gid=261
http://www.lunatipower.com/Product.aspx?id=3153&gid=261
#929
Registered
after reading this post I am not feeling too good with my MK cams. I just got a heads and cams package specked from MK 2 months ago and numbers are not than much off of Tim's. thought I was doing the right thing going to MK spent to me was a lot of money building my 540's. my motors are almost finished and I may end up with a couple of 540 stones for the money I spent. that sucks. my grind # is XA242-390/247-385/112+4 core# 315629 actual on cam card reads 242.2 .664 247.1 .656 325 AFR heads
#930
Registered
You`d think after all these issues he`d go back to just copying stock grinds and changing them slightly.
Mistakes happen, trying new things isn`t a bad thing but realize the mistake, admit your mistakes, own it, make it right, learn from it, don`t repeat it, move on. That`s just good business.
Mistakes happen, trying new things isn`t a bad thing but realize the mistake, admit your mistakes, own it, make it right, learn from it, don`t repeat it, move on. That`s just good business.