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Dinosaur Mechanic
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Discussion Starter #1 (Edited)
I was wondering how much spring pressure you can safely run on a cast solid roller cam versus a billet roller? I have a crane solid .246/.254 at .050 .630 lift and the sheet I got online calls for 160 lbs on seat but my motor has 180- 210 lbs on seat. My motor lays down about 5K rpm and it has 3/8 valves steel retainers all heavy shit!
I am going to titanium retainers but was wondering if I need this much spring pressure, or do I dare run more. My springs will clear .720 lift so it isn't coil bind.

Thanks
 

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180- 210 lbs on seat
That's a big spread on pressure's you should go back and shim them so they are more consistant since your going to change retainers anyway. What size motor is this cam in? It shouldn't "lay down" at 5K with that kind of spring pressure.
 

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Dinosaur Mechanic
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Discussion Starter #3
It is a 468 12 to 1 comp. 049 heads. It is 5 years old so I am replacing lifters and springs just to be safe, its a street car.
 

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Dinosaur Mechanic
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Discussion Starter #4
Just want to make sure I won't do any harm with too much spring pressure. My cam is an old Crane SR grind. Can't call them for help yet......
 

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I was wondering how much spring pressure you can safely run on a cast solid roller cam versus a billet roller? I have a crane solid .246/.254 at .050 .630 lift and the sheet I got online calls for 160 lbs on seat but my motor has 180- 210 lbs on seat. My motor lays down about 5K rpm and it has 3/8 valves steel retainers all heavy shit!
I am going to titanium retainers but was wondering if I need this much spring pressure, or do I dare run more. My springs will clear .720 lift so it isn't coil bind.

Thanks
Is it a Cast core or a SADI core, steel just with induction hardend gear on it?
 

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Dinosaur Mechanic
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1,615 Posts
Discussion Starter #8
I was informed by this engine builder and another member on here that Crane did not make any cast iron solid roller cams, they were all billet. I goofed though I have 781 heads not 049 heads like I said earlier. The 049s are on my 396.
 

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Dinosaur Mechanic
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1,615 Posts
Discussion Starter #10
Alright thanks. Put in new springs 250 at 2.00 so they should end up 220-230.
How much would say my cam 256/[email protected] with .020 lash change if I tightened lash up to .016? would duration change much?
 
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