Hi, I'm going to turbo a 383 that I'm building. I have 3 choices on my timing chain 0,4 degrees advanced or 4 retarted. should I go standard and retard with my distribuator or should I retard the cam 4 degrees right off the get go. thanks
Where, in the RPM range, do you want the power? Retarding or advancing the cam timing will move the power around in the rpm range.
I'd retard the ignition and leave the cam straight up for starters. The stock cam might be just fine. Typically though, valve overlap is not so good in a turbo engine. If given a choice, go for a cam with minimum or no overlap ... look for a good amount of lift especially on the exhaust side.
Duration ... meh, little is fine.
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