Kamm was not flashy on Friday as he began play on the second nine at Southern Trace. He made back-to-back birdies at Nos. 15 and 16 for a front-nine 34.
He opened his second nine with another pair of birdies at Nos. 1 and 2 before parring the next five. Kamm bogeyed No. 8 to drop into a share of the lead but a birdie at the par-5 9th gave him sole possession of the top spot.
Kamm is on the bubble, currently 55th on the money list, and it is not the first time he has been in a difficult position at the Shreveport Open. In 1997, he finished as runner-up to earn the right to play in the Tour Championship, then tied for fifth there to finish eighth on the final money list to qualify for the PGA Tour the following year.
'I've played well here in the past,' said Kamm. 'Part of it is confidence, but the greens play hard and I enjoy that part of it.'
Heintz has also enjoyed success in this event, winning in 1999, and he needs another big finish to qualify for next week.
'Two years ago it was survival. This year we are seeing who can outdo each other birdie-wise,' said Heintz, who is 67th on the money list. 'I understand the greens. I'm comfortable with the grain and the speed. I like them fast.'
Bates mixed six birdies and two bogeys over his round on Friday for a 4-under 68.
Brian Claar is alone in fourth place at 9-under-par, followed by Stiles Mitchell and Don Reese, who share fifth at minus-eight.
D.A. Points, John Rollins and Jason Caron are knotted in seventh at 7-under.
Tjaart van der Walt, who led after round one, struggled to a 2-over 74 and is part of a group tied for 10th at minus-six.
Sixty-eight players made the cut, which fell at 2-under-par 142.
Click Here for Full Field Scores from the Buy.Com Shreveport Open.