Hey look on the bright side you can sell me the rockers
CK5
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SB400 carnage pics
- Thread starter mountainexplorer
- Start date
I havent seen many break,but a few..
It is rare for a cam to break,that citation 2.5 I mentioned in my other post was one of only two I have seen break--the other one was in a 283 a guy had that sat for years,he got it running and beat the hell out of it for a few days,then it blew up--I'm thinking a valve got stuck in the guide,or the lifter bores were worn,and let the lifter "cock" in the bore and jam up,and the cam kept on pushing it up,until the cam reached its snapping point....once the lifters reach the crank,its all over....cams are pretty brittle,I saw a brand new one roll off the parts counter at work and shatter into nuggets,much to the horror of myself and the customer who had just paid for it!
They look like cast steel inside when they break,dont they??..makes me wonder how they live at all??...I've seen more than one 400 block that had cam bearing alignment problems too--they had to be line bored after the bearings were installed to get the cam in the block without a hammer,and were too stiff to turn by hand until they line bored them.(almost like the block had "tweaked").I had my doubts about the longevity of those motors,but one is in my friends truck,still going 5 years later...
It is rare for a cam to break,that citation 2.5 I mentioned in my other post was one of only two I have seen break--the other one was in a 283 a guy had that sat for years,he got it running and beat the hell out of it for a few days,then it blew up--I'm thinking a valve got stuck in the guide,or the lifter bores were worn,and let the lifter "cock" in the bore and jam up,and the cam kept on pushing it up,until the cam reached its snapping point....once the lifters reach the crank,its all over....cams are pretty brittle,I saw a brand new one roll off the parts counter at work and shatter into nuggets,much to the horror of myself and the customer who had just paid for it!
They look like cast steel inside when they break,dont they??..makes me wonder how they live at all??...I've seen more than one 400 block that had cam bearing alignment problems too--they had to be line bored after the bearings were installed to get the cam in the block without a hammer,and were too stiff to turn by hand until they line bored them.(almost like the block had "tweaked").I had my doubts about the longevity of those motors,but one is in my friends truck,still going 5 years later...
mountainexplorer
1/2 ton status
We checked the cam's specs with a mic.
It wasn't even a 292/.510 lift.
It came out to .454 lift, and about a 260 duration
That was from a good lobe. Other lobes looked like they were on their way to going flat.
It wasn't even a 292/.510 lift.
It came out to .454 lift, and about a 260 duration
That was from a good lobe. Other lobes looked like they were on their way to going flat.
Thunder
3/4 ton status
Did you degree the cam and check the piston to valve clearance? Coil bind?
mountainexplorer
1/2 ton status
I'm a dummy. I know the basics of how an engine works and goes together. The most intricate tool I have is a spark plug gapper. But I lost it some time ago.
