318willrun said

So I'm just looking at your 1st post. Really, your intake swap really isn't an upgrade on your engine. Going from a 600 to a 650 really isn't an upgrade. So what we are really talking about is a head swap. What head castings do you have now ?? I know all about trying to get a car to run in Colorado, it has a way of flattening them out.

• So, with just a head swap and not knowing what heads you have now, my suggestion is to cut the 340 heads .040 and put them on.

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