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How exactly do I measure the distance? this is my very first engine build so any help would be awesome.

So question? I'm building a sbc 400 my cam has a lift of. 443/465 and duration of do you think that this cam with vortec heads would work good? and if al what intake would you recommend for this...

I'm putting a set of Vortec heads on my sbc 400 my cam has a lift of .443/.465. i've heard a lot of different things about the highest lift vortecs can take without machining ive heard .420-.550....