Detroit Lions tight end Brandon Pettigrew, right, makes a 9-yard touchdown reception next to San Francisco 49ers strong safety Donte Whitner (31) during an NFL football game in San Francisco, Sunday, Sept. 16, 2012. San Francisco won 27-19. (AP Photo/Tony Avelar)

San Francisco 49ers wide receiver Mario Manningham carries the ball past Detroit Lions strong safety Erik Coleman, right, during the first quarter of an NFL football game in San Francisco, Sunday, Sept. 16, 2012. (AP Photo/Marcio Jose Sanchez)

Tight end Vernon Davis #85 tosses the ball through the uprights after scoring a touchdown against the Detroit Lions at Candlestick Park in San Francisco, California on September 16, 2012. (Ric Tapia/NFL)

Tight end Vernon Davis #85 leaps over photographers after scoring a touchdown against the Detroit Lions at Candlestick Park in San Francisco, California on September 16, 2012. (Ric Tapia/NFL)

Quarterback Alex Smith #11 under centerr during the NFL game between the Detroit Lions and the San Francisco 49ers at the Candlestick Park in San Francisco, California on September 16, 2012. (Ric Tapia/NFL)

Guard Mike Lupati #77, tight end Vernon Davis #85, and quarterback Alex Smith #11 of the San Francisco 49ers celebrate a touchdown against the Detroit Lions at Candlestick Park in San Francisco, California on September 16, 2012. (Ric Tapia/NFL)

Detroit Lions quarterback Matthew Stafford #9 throws during warm-ups before the NFL game between the Detroit Lions and the San Francisco 49ers at the Candlestick Park in San Francisco, California on September 16, 2012. (Ric Tapia/NFL)

Fans in Candlestick Park cheer before an NFL football game between the San Francisco 49ers and the Detroit Lions in San Francisco, Sunday, Sept. 16, 2012. (AP Photo/Tony Avelar)

San Francisco 49ers defensive back Chris Culliver, right, breaks up a pass intend for Detroit Lions wide receiver Titus Young, left, during the first quarter of an NFL football game in San Francisco, Sunday, Sept. 16, 2012. A pass interference penalty was called on the play. (AP Photo/Marcio Jose Sanchez)

San Francisco 49ers running back Frank Gore, right, runs with the ball but is stopped by Detroit Lions outside linebacker Justin Durant, left, during the first quarter of an NFL football game in San Francisco, Sunday, Sept. 16, 2012. (AP Photo/Marcio Jose Sanchez)

San Francisco 49ers running back Frank Gore celebrates after scoring a touchdown during the second quarter of an NFL football game against the Detroit Lions in San Francisco, Sunday, Sept. 16, 2012. (AP Photo/Marcio Jose Sanchez)

San Francisco 49ers running back Frank Gore carries the ball into the end zone for a touchdown during the second quarter of an NFL football game against the Detroit Lions in San Francisco, Sunday, Sept. 16, 2012. At right is 49ers defensive tackle Will Tukuafu (92). (AP Photo/Marcio Jose Sanchez)

Detroit Lions wide receiver Calvin Johnson is stopped by San Francisco 49ers strong safety Donte Whitner, bottom, as defensive back Chris Culliver, top, moves in during the second quarter of an NFL football game in San Francisco, Sunday, Sept. 16, 2012. (AP Photo/Tony Avelar)

San Francisco 49ers head coach Jim Harbaugh yells during the second quarter of an NFL football game against the Detroit Lions in San Francisco, Sunday, Sept. 16, 2012. (AP Photo/Tony Avelar)

San Francisco 49ers running back Frank Gore, right, carries the ball past Detroit Lions defensive back Drayton Florence, left, during the second quarter of an NFL football game in San Francisco, Sunday, Sept. 16, 2012. (AP Photo/Tony Avelar)

San Francisco 49ers tight end Vernon Davis runs with the ball for a touchdown past Detroit Lions free safety John Wendling, right, during the first quarter of an NFL football game in San Francisco, Sunday, Sept. 16, 2012. Davis scored on a 21-yard pass from quarterback Alex Smith. (AP Photo/Tony Avelar)

San Francisco 49ers wide receiver Randy Moss reaches for a pass, but Detroit Lions cornerback Jacob Lacey is called for interference on the play, during the first quarter of an NFL football game in San Francisco, Sunday, Sept. 16, 2012. (AP Photo/Marcio Jose Sanchez)

Detroit Lions head coach Jim Schwartz applauds on the sidelines during the second quarter of an NFL football game against the San Francisco 49ers in San Francisco, Sunday, Sept. 16, 2012. At right is Detroit Lions outside linebacker Justin Durant. (AP Photo/Tony Avelar)

Running back Frank Gore #21 of the San Francisco 49ers runs the ball against the Detroit Lions at Candlestick Park in San Francisco, California on September 16, 2012. (Ric Tapia/NFL)

Wide receiver Randy Moss #84 runs after the catch during an NFL game against the Detroit Lions at Candlestick Park in San Francisco, California on September 16, 2012. (Ric Tapia/NFL)

The San Francisco 49ers take the field before a game against the Detroit Lions at the Candlestick Park in San Francisco, California on September 16, 2012. (Ric Tapia/NFL)

Running back Joique Bell #35 of the Detroit Lions runs the ball past linebacker Aldon Smith #99 of the San Francisco 49ers during an NFL game at the Candlestick Park in San Francisco, California on September 16, 2012. (Ric Tapia/NFL)

Quarterback Alex Smith #11 throws during an NFL game against the Detroit Lions at the Candlestick Park in San Francisco, California on September 16, 2012. (Ric Tapia/NFL)

San Francisco 49ers tight end Vernon Davis, left, and Detroit Lions defensive back Drayton Florence battle for the ball during the second quarter of an NFL football game in San Francisco, Sunday, Sept. 16, 2012. (AP Photo/Marcio Jose Sanchez)

The San Francisco 49ers cheerleaders look on during an NFL game between the Detroit Lions and the San Francisco 49ers at the Candlestick Park in San Francisco, California on September 16, 2012. (Ric Tapia/NFL)

A San Francisco 49ers cheerleader performs during an NFL game between the Detroit Lions and the San Francisco 49ers at the Candlestick Park in San Francisco, California on September 16, 2012. (Ric Tapia/NFL)

San Francisco 49ers quarterback Alex Smith, left, runs with the ball past Detroit Lions strong safety Erik Coleman, center, and defensive end Cliff Avril, right, during the third quarter of an NFL football game in San Francisco, Sunday, Sept. 16, 2012. (AP Photo/Tony Avelar)

Detroit Lions running back Kevin Smith, top, is upended by San Francisco 49ers free safety Dashon Goldson, bottom, during the third quarter of an NFL football game in San Francisco, Sunday, Sept. 16, 2012. (AP Photo/Tony Avelar)

Detroit Lions tight end Brandon Pettigrew #87 is tackled by San Francisco 49ers inside linebacker Patrick Willis #52 during the NFL game between the Detroit Lions and the San Francisco 49ers at the Candlestick Park in San Francisco, California on September 16, 2012. (Ric Tapia/NFL)

Detroit Lions quarterback Matthew Stafford #9 is sacked by San Francisco 49ers outside linebacker Aldon Smith #99 during the NFL game between the Detroit Lions and the San Francisco 49ers at the Candlestick Park in San Francisco, California on September 16, 2012. (Ric Tapia/NFL)

San Francisco 49ers running back Frank Gore #21 avoids being tackled by Detroit Lions outside linebacker Justin Durant #52 during the NFL game between the Detroit Lions and the San Francisco 49ers at the Candlestick Park in San Francisco, California on September 16, 2012. (Ric Tapia/NFL)

San Francisco 49ers quarterback Alex Smith celebrates at the end of a win over the Detroit Lions during an NFL football game in San Francisco, Sunday, Sept. 16, 2012. San Francisco won 27-19. (AP Photo/Tony Avelar)

Head coach Jim Schwartz of the Detroit Lions and head coach Jim Harbaugh of the San Francisco 49ers shake hands following their game at Candlestick Park in San Francisco, California on September 16, 2012. (Ric Tapia/NFL)

San Francisco 49ers tight end Vernon Davis, right, runs to score a touchdown as Detroit Lions cornerback Jacob Lacey, left, watches during the fourth quarter of an NFL football game in San Francisco, Sunday, Sept. 16, 2012. Davis scored on a 23-yard pass from quarterback Alex Smith. (AP Photo/Tony Avelar)

Detroit Lions quarterback Matthew Stafford, right, is brought down by San Francisco 49ers outside linebacker Ahmad Brooks, left, during the fourth quarter of an NFL football game in San Francisco, Sunday, Sept. 16, 2012. (AP Photo/Tony Avelar)