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335 Series- 5.8/351M, 6.6/400, 351 Cleveland
Cam swap question

Cam swap question

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Old

Aug 20, 2008 | 06:16 AM

#1

SRT77

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Junior User

Joined: Mar 2006

Posts: 94

Likes: 1

From: Ventura, CA

Cam swap question

If I'm throwing in a new, but mild cam, do I need to replace the valve springs. I'm looking at a Summit kit, part# sum-k5200, which come with lifters and I'll replace the timing set also. I know I probably should, but do I really need to replace the springs?

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Old

Aug 23, 2008 | 08:46 PM

#2

Iman901

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Joined: Jun 2008

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From: KFalls

You dont have to, but if the springs are old you should test them. Also if you want to run higher RPMs you need stiffer springs.

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Old

Aug 24, 2008 | 03:46 PM

#3

mark a.

Lead Driver

Joined: Mar 2004

Posts: 8,922

Likes: 153

Springs are cheep. You should use the recomended spring & get rid of the exhaust rotators if your heads have them. I would check push rod length also. Aftermarket cams can have a different base circle.

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