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Old 04-10-2012, 12:58 PM
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question on valve springs for 454

I am putting together my 454 with this mild hydraulic roller cam and my stock 049 heads I dont know what valve springs to get, I called howards cams about valve springs and they said I would have to tell them my installed valve spring height for them to give me valve spring reccomendations which confused me, do they want to know what the installed valve spring height is off my factory valve springs or something? Anyone ran this cam before with some stock 049 heads and know what kinda valve springs to use?


CL120245-12
adv dur 278 284
duration at 50 225 231

.567.578
112
108
1800-5400

Fair idle, Street & mild Performance usage. Crisp throttle.

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Old 04-10-2012, 02:13 PM
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Stock 049 heads have very short valve springs and pockets.

Only economical way to increase height is to use +.100 retainers. Std height locks. You will find these available in 10 degree. Use a rotator eliminator spacer in the exhaust spring seats. Then measure the available height. Also measure assembled dimension from top of guide to inner retainer. Most aftermkt springs for application above .550 lift don't have room for BBC valve seals. Guides will probably have to be shortened and cut for seals.

Alternative is longer valves, spring seats machined or sink valves (NO-NO).
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Old 04-10-2012, 02:20 PM
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Sounds like they want to know what your current installed height is so they can determine the proper spring rate to get the correct pressure at open and closed valve positions...

So yes to your question, "do they want to know what the installed valve spring height is off my factory valve springs or something"

...or like BOBCRMAN says, modify the head/valve train around the correct spring.
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