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| Re: Cam |
Subject: Re: Cam
by ddgonzal on 2012/11/17 3:55:04
What is "better than stock"? The stock camshaft is very very good for 3000-6000 powerband. It came in 1975-1980 A14/A15.
Do you need them? With extra high RPM cam you will need upgraded springs. Either single or dual. Sometime you need special springs with low-RPM high-lift cam, so ask you cam vendor.
If you rev the engine higher than 6000 you should get special hi-rpm valvesprings. The stock ones will usually go 6400 RPM but they are not engineered for it and at 40 years old may not even go to spec. Try it, if it runs smooth they are OK.
Nissan sold 6400 rpm dual-valve springs. Iskenderian sells dual springs for something like 9000 RPM, which springs should be avoided unless actually running the engine high RPM because they wear out the valve guides and cam lobes faster.
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