Welcome to our NEW website! We've made a few changes. Let us know what you think.

Mercruiser 4.3L Marine Engine Performance Specifications

Feb 15th, 2012 by admin

Performance Product Technologies handles a variety of different Mercruiser 4.3L V6 Bobtail Engines and Longblocks. The GM 4.3L engine has been used in Marine Applications since 1986. The 4.3L changed to the Vortec style (8 Bolt Intake Manifold) in 1996 and for Marine Applications it's known as the Gen + version of the engine (Read More).  Its important to note that the VORTEC terminology is not the same for Marine as with Automotive. NOTE: The "Vortec" version of the the 4.3L V6 engine was being used in automotive applications well before it was introduced into Mercruiser and Volvo Penta marine applications. (4.3L/V-6 Models)      




4.3L EFI  

Propshaft Horsepower

(SAV1 Rating)






Propshaft Kilowatts

(SAV1 Rating)







262 cid (4.3 l)

Maximum rpm @ WOT3

4400-4800 rpm

Idle rpm in NEUTRAL

650 rpm5

600 rpm6

Oil Pressure @ 2000 rpm

30-70 psi (207-483 kPa)

Min. Oil Pressure @ Idle

4 psi (28 kPa)


160o F (71o C)

Timing @ Idle rpm4

10o BTDC


Firing Order


Electrical System

12-Volt Negative (-) Ground

Alternator Rating – Hot

Operating Amps

65 Amps

Alternator Rating – Cold

Operating Amps

72 Amps



Rating (Minimum)

375 cca/

475 mca/ 90 Ah

550 cca/

700 mca/120 Ah

1 Power Rated in Accordance with NMMA (National Marine Manufacturers’ Association) rating procedures.  

2 Power Rated in Accordance with SAV 1 rating procedures. Horsepower differences shown result from differences in test rpm, allowable test tolerances, and/or installation of special kit components.  

3 Measured using an accurate service tachometer with engine at normal operating temperature.  

4 A special procedure must be followed to check or adjust timing. Consult your Authorized mercury MerCruiser Dealer before attempting this procedure.  

5 A special procedure must be followed to adjust idle rpm. Consult your Authorized Mercury MerCruiser Dealer before attempting this procedure.  

6 Idle speed on EFI models is not adjustable. 


Buy the products and parts you need...

Buy Parts and Products

Request Information or Support


Follow Us: