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Re: Another 489bbc question
If you called any custom cam maker worth his salt, without head flow data, he simply wouldn't make you one! You can get great power with off the shelf cams, however if your really looking to up your performance, a custom ground cam is the only way to go. I'm even a little hesitant to say this, but on the 496 I'm in progress with right now, I went ahead and went with the large body roller lifters.. So when the block finally lands in the machine shop, they can fully blue print the lifter bores to the exact tolerances. A very well respected and know engine and custom cam builder stated that you could see as much as 30hp increase with the larger lifters and blue printed lifter bore size. The extra power isn't the lifters, its simply the by product of efficiency and corrected valve train geometry!
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