Quote:
Originally Posted by Formulajones
The valvetrain in the LS engines are much lighter than Pontiacs, so they work well with a little less spring pressures on aftermarket camshafts than what you would typically see today, especially in engines with heavier valvetrains.
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When I had my LS3 apart to do a valve spring and camshaft swap, I weighed the intake valves to compare against my 2.11 stainless valves.
Stock LS3 - 88 grams
F6189 (machined down to 2.11 w/30deg seat)- 147 grams
And that's JUST the valve!