Thread: 500 hp/550 lb-ft from a 390?

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Thanks for all the input guys but I could use a bit of clarification regarding valve springs, camshafts and cylinder heads. I suppose I'm going to suck it up and get the Edelbrock heads but I'm unsure about the valve springs already installed on the fully assembled version. Do I go with those as supplied or get the bare heads, buy valves, springs retainers and use the springs that come with the camshaft? I'm planning on using the recommended Comp Cam by the way...

My best advice is to use the spring recommended by the cam grinder for that particular cam. Find out the particulars from the cam grinder, then call Edelbrock and ask if they can supply the exact specs on their installed springs. If they can't, then order the heads less springs and install the recommended springs yourself.

You're going to use a Comp? I thought you'd use the Crower that I dyno'd for you. It turned out so sweet with better low end torque.