Ramsey was quick to share the credit.
"I was fortunate my teammates were able to feed me the ball," he said.
Emmanuel Flores was one Bulldog who served buckets for Ramsey as he finished with six assists.
Ramsey also scored down low after Flores opened the second half by draining a pair of three-pointers. That forced Southwest to break from its zone defense, Valenzuela noted, and try to play the Bulldogs man-to-man.
Southwest hung with the Bulldogs for most of the first half, trailing by five at the end of the first quarter 16-11 and again by five with three minutes to go before halftime. Just before intermission, though, Ramsey hit a pair of buckets inside and cashed in a free throw, and Adrian Moran popped a 14-footer to push Calexico up by eight at the break 31-23.
After Flores opened the second half with his two treys, Ramsey took over. He scored 10 straight Bulldog points during the third quarter as Calexico opened a 54-34 advantage entering the fourth period.
Just for good measure, Ramsey showed he could hit from outside as he nailed a 3-pointer just before the quarter ended.
The Bulldogs kept applying the pressure in the final stanza, even after Valenzuela pulled his starters with just under four minutes to play.
Off the bench, reserve Sergio Pesqueira scored six straight Bulldog points in the waning moments with moves to the basket.
"Our kids executed our game plan in the second half perfectly," Valenzuela said.
He added the idea was to try and take the ball inside against Southwest.
"Their post players killed our post players," Southwest skipper Marty Zwart said.
In addition to Ramsey and Pesqueira, Calexico got a solid performance from Flores, who finished with 16 points. He also pulled down 11 rebounds.
Adrian Maldonado scored seven points for Calexico, Abel Mares sank six, Alex Marin popped four and Chris Johnson and Moran both added three.
Maldonado had seven rebounds and he blocked a shot.
"They beat us in all parts of the game," Zwart said.
Jesse Hoyt led Southwest with 12 points and 10 rebounds. Devin Hood dropped 10 points, Brian Martinez scored eight, Nate Smith hit seven and Chris Lara added six.
"We played great team defense," Valenzuela said. "And after that, we were real patient on offense."
Calexico (5-8 overall, 1-1 Imperial Valley League) hosts Holtville High at 7 p.m. Tuesday. Southwest (4-11, 1-1) travels to Imperial High for a 7 p.m. Tuesday contest.
Brawley 87, Central 67
The Brawley Union High boys basketball team handed Central Union High its 18th straight loss of the year with an 87-67 decision in El Centro on Friday.
Lafayette Lofton led Brawley with 21 points, followed by Mark Rivera with 20.
Central was led by Vincent McSee with 19 points and Luis Robles with 16.
Both teams next play at 7 p.m. Tuesday, with Brawley (2-0 IVL) hosting Calipatria and Central (0-2) playing at Palo Verde in Blythe.
Calipatria 53, Palo Verde 47
BLYTHE — The Calipatria High boys basketball team improved to 3-0 in the Imperial Valley League with a 53-47 victory over Palo Verde here Friday.
Ezequiel Navarro led Calipatria with 22 points followed by Vontray Taylor with 10 and Jorge Navarro with eight.