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Old 07-18-2003, 05:58 PM
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Valve Springs

Can I use non roller springs with a roller cam? that's my main question. I bought a roller spring kit with 10deg locks and big springs with pressure to support my cam and when I got the springs they are HUGE!!! I don't know what to do with them.. Here are some pics of the springs and I'm comparing the roller spring to a 510 lift spring. These springs are +100 and I didn't know it. My pockets have been cut for 550 lift springs and they look like they need another 1/4 just for these springs to fit!! Could I just buy a standard 600 lift kit and use it with my roller cam with 613 lift??
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Old 07-18-2003, 05:59 PM
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Old 07-19-2003, 01:11 AM
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Does't anyone know about springs.. seat pressure, open pressure??
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Old 07-19-2003, 02:08 AM
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Youll probably need longer valve stems depending on the installed height of the springs. I dont know if i would cut another 1/4 inch into the heads.

IF your roller cam has 613 lift....getting a 600 lift kit would cause spring binding. Roller cams need a stiffer spring becuae the lifters are heavier and they have more radical ramps...you COULD use a regular spring, but itll be more likely to float at a lower rpm than with a roller cam spring. So im thinking youll need to cut the spring pockets so the bigger diameter spring will fit, then get valves with longer valve stems. Youll need an adjustable valve train tho.
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Old 07-19-2003, 11:47 AM
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You did not state what heads you now have or the present spring height, putting large springs in some factory sbc heads is not possible as there isn't enuf material for the o.d. of the spring to set on, a .100 cut is not advisable, a .250 cut impossible.even if you can cut the sp seats the only thing you can do is get longer valves and/or offset keepers, most stock spring heights are around 1.72" . what do you have and what is the rated height for the new springs?

As previously stated you need more seat pressure because of the dynamics of a roller cam, also remember as the seat pressure increases the stress on the valve also increases, I've seen stock type valves tuliped and pulled thru the seats and/or the keeper grooves pulled up the valve stem, so be careful, a dropped valve ain't a pretty sight.. know what you are doing or go to someone who does!!
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Old 07-19-2003, 12:00 PM
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I'm running 492 double humps.. They were and "over the counter" GM part with angle plugs and #2 OEM ports. I have made up my mind and I'm not running a roller cam with the Double Humps.. my cam has a 613 lift and they double humps are definatly not made for that. I'm dropping in a set of standard 600 lift springs and changing my cam to a solid flat tappet cam with like a 570 lift and it will be a cheaper and easier task because I won't have to do much work to the heads (compared to the roller set-up). Then when I get the money I'm buying a set of roller ready aluminum heads and converting to a roller cam. For now I just want to get it running with the double humps. I have alredy contacted the place where I bought the roller spring kit and the guy said "no problem" and he gave me a return address and sadi he could set me up with a 600 lift kit in exchange.
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