FIRST MATE MARINE ENGINE'S
MAKE GENERAL MOTORS 260 to 360 Hp

YEAR APPROX HP DESCRIPTION BLOCK CASTING # SHORT BLOCK STANDARD ROTATION LONG BLOCK STANDARD ROTATION SHORT BLOCK REVERSE ROTATION LONG BLOCK REVERSE ROTATION LONG BLOCK WITH VALVE COVER, TIMING COVER AND OIL PAN ALREADY INSTALLED STANDARD ROTATION LONG BLOCK WITH VALVE COVER, TIMING COVER AND OIL PAN ALREADY INSTALLED REVERSE BEACON MARINE SUPPLY PRICE
67-85 260 2 Piece Rear Main Seal. Valve Covers Bolt Around Perimeter. 2 Bolt Main. For Port Or Starboard Dipstick. 245, 379, 010, 014, 678, 388, 618 SGM350LA

$1,500.00

 GM350LA

$1,700.00

 SGM350RA

$1,600.00

 GM350RA

$1,800.00

 GM350LAT

$1,900.00

 GM350RAT

$2,000.00

  
86-87 260 1 Piece Rear Main Seal. Valve Covers Bolt Around Perimeter. 2 Bolt Main. 548, 526, 148, 638 SGM350LB

$1,575.00

 GM350LB

$1,775.00

 SGM350RB

$1,675.00

 GM350RB

$1,885.00

 GM350LBT

$1,97500

 GM350RBT

$2,000.00

  
88-95 260 1 Piece Rear Main Seal. Valve Covers Bolt Down Center. 2 Bolt Main. Has Metal Timing Cover. 12 Bolt Timing Cover 548, 526, 148, 638 N/A GM350LC

$1,850.00

 N/A GM350RC

$1,975.00

 GM350LCT

$2,050.00

 GM350RCT

$2,150.00

  
88-94 260 1 Piece Rear Main Seal. Valve Covers Bolt Down Center. Roller Cam Engine. Has Metal Timing Cover. 12 Bolt Intake. 548, 526, 148, 638 SGM350LD

$1,800.00

 GM350LD

$2,000.00

 N/A N/A GM350LDT

$2,200.00

 N/A  
95-99 260 1 Piece Rear Main Seal. Roller Cam. Timing Cover Plastic. 12 Bolt Intake. 880 N/A GM350LE

$2,500.00

 N/A N/A N/A N/A  
95-99 260 1 Piece Rear Main Seal. Roller. Timing Cover Plastic. 8 Bolt Intake.   N/A GM350LF

$2,500.00

 N/A N/A N/A N/A  
67-85 260 2 Piece Rear Main Seal. Valve Covers Bolt Around The Perimeter. 4 Bolt Main. 245, 379, 010, 014, 678, 388, 618 SGM350LAF

$1,510.00

 GM350LAF

$1,795.00

 SGM350RAF

$1,630.00

 GM350RAF

$1,895.00

 GM350LAFT

$1,985.00

 GM350RAFT

$2,095.00

  
86-87 260 1 Piece Rear Main Seal. Valve Covers Bolt Around Perimeter. 4 Bolt Main. Double Check The Rear Main Seal. This Is Not A Very Common Engine. 245, 379, 010, 014, 678, 388, 618, SGM350LBF

$1,585.00

 GM350LBF

$1,810.00

 SGM350RBF

$1,685.00

 GM350RBF

$1,900.00

 GM350LBFT

$2,050.00

 GM350RBFT

$2,100.00

  
88-94 260 1 Piece Rear Main Seal. Valve Covers Bolt Down The Center. 4 Bolt Main. Has A Metal Timing Cover. 12 Bolt Intake. 548, 526, 148, 638 N/A GM350LCF

$1,950.00

 N/A GM350RCF

$2,075.00

 GM350LCFT

$2,150.00

 GM350RCFT

$2,255.00

  
67-85 275 2 Piece Rear Main Seal. Valve Covers Bolt Around The Perimeter. 4 Bolt Main. This Is A Cam Upgrade. 245, 379, 010, 014, 678, 388, 618 N/A GM350LAFHO

$1,895.00

 N/A N/A GM350LAFHOT

$2,095.00

 N/A  
86-87 275 1 Piece Rear Main Seal. Valve Covers Bolt Around Perimeter. 4 Bolt Main. This Is A Cam Upgrade. 245, 379, 010, 014, 678, 388, 618 N/A GM350LBFHO

$1,910.00

 N/A N/A GM350LBFHOT

$2,105.00

 N/A  
88-94 275 1 Piece Rear Main Seal. Valve Covers Bolt Down Center. 4 Bolt Main. This Is A Cam Upgrade. Has A Metal Timing Cover. 548, 526, 148, 638 N/A GM350LCFHO

$2,050.00

 N/A N/A GM350LCFHOT

$2,245.00

 N/A  
73-90 330 2 Piece Rear Main Seal. Oval Intake Port Heads. 959, 512, 445 SGM454LA

$2,245.00

 GM454LA

$2,800.00

 SGM454RA

$2,300.00

 GM454RA

$2,900.00

 GM454LAT

$3,050.00

 GM454RAT

$3,175.00

  
91-97 330 1 Piece Rear Main Seal. Oval Intake Port Heads. 182 SGM454LB

$2,300.00

 GM454LB

$2,895.00

 SGM454RB

$2,400.00

 GM454RB

$3,050.00

 N/A N/A  
91-96 380 1 Piece Rear Main Seal. High Performance Series. 10 Bolt Timing Cover. R & R Only..   N/A GM454LC

$3,600.00

 N/A N/A N/A N/A  
96- 330 1 Piece Rear Main Seal. Roller Cam Engine. Gen VI 6 Bolt Timing Cover. 297 N/A GM454LD

$3,55000

 N/A N/A N/A N/A  
73-90 350 2 Piece Rear Main Seal. Oval Intake Port Heads. This Engine Is A Cam Upgrade. 959, 512, 445 N/A GM454LAHO

$2,895.00

 N/A N/A GM454LAHOT

$3,200.00

 N/A  
70-76 325 Oldsmobile Engine. O21 SGM455LA

$1,595.00

 GM455LA

$2,095.00

 N/A N/A N/A N/A  
91-98 360 Standard Base Replacement.   N/A GM502LA

$4,500.00

 GM502RA

$4,600.00

 N/A N/A N/A