1988 volvo 245 wagon V8
#41
TECH Junkie
iTrader: (1)
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From what I understand, you use dowels to hold the lifters up. Good video to watch as a whole, but fwd to 8 minute mark to get to the point.
https://www.youtube.com/watch?v=u4XNxOUuoJ4
https://www.youtube.com/watch?v=u4XNxOUuoJ4
#42
TECH Senior Member
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OK- most cam blanks start with the "lobes" looking like bearing journals, at the same OD as the actual bearing journals. When grinding the cam, the base circle determines the lift. The peak of the lobe remains the same height as the bearing journal. This is why some cams need different length pushrods, as higher lift cams allow the lifter and pushrod to sink lower to account for the increased lift.
#43
TECH Junkie
iTrader: (1)
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OK- most cam blanks start with the "lobes" looking like bearing journals, at the same OD as the actual bearing journals. When grinding the cam, the base circle determines the lift. The peak of the lobe remains the same height as the bearing journal. This is why some cams need different length pushrods, as higher lift cams allow the lifter and pushrod to sink lower to account for the increased lift.
#44
TECH Junkie
iTrader: (1)
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Got it - as I mentioned earlier, knew I was missing something. The fly in the ointment was my assumption that the lobe peak was smaller than the journal...you’re saying they’re essentially the same height which means if use the lobe to push the lifter to peak lift, the journal will clear it too. Provided, of course, that the retainer does it’s and doesn’t let it slip back down the lifter bore even a small amount. Thanks for the education. All the other older V8’s I’ve played with, you have to remove the lifters for a cam change. To remove lifters, at least the intake has to come off....and on some the heads too.
#46
TECH Senior Member
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Now you know why cam changes in LS's are such a snap! Glad to help! It's what forums like this are all about.
#48
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Spun the center thrust bearing on the 4.8L. The plastic patch got sucked into the motor on the modified truck manifold on the 4.8L. Pulled the heads and saw plastic stuck to the valves. Bought a new 5.3 100k miles from LKQ (would never recommend them). Installed a brand new oil pump timing chain and a BTR stage III cam. Bought a true trac rear end, and I just need to install it. I'm will probably just leave this intake stock for now.
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