grandson diesel
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I've heard good about fel and victor, I personally go with cummins as not to chance it. And thicker doesn't hell that much. I do it to add a little extra clearance for a cam or if you've had the head decked. What I would do while the head is off is have it prepared for studs and o ringed, and at least 60lb valve springs then the sky is the limit for power making. If you don't have those 3 things your fairly limited