Re: Yoke seal & misc. Merc. HP spec .
#1 You may be refering to the front seal in the top gearbox. Are we talking about a seal about 3" diameter?<br /><br />#2 The 4.3L V6 was/is supplied in many variants. Firstly there was 3 generations of the block. The first had fluid engine mounts to absorb the harmonic vibrations created by a V6 engine with a 90 degree V. The second, known as "Gen II", had a balance shaft running counter to and at the same speed as the camshaft. The third, and current, is the "Gen +", different heads and intake manifold and a single (serpentine) 'fan' belt. Not withstanding the above, it also appeared with 3 different fuel systems. One was a 2bbl Mercarb, another with a 4bbl carb, early were a Rochester Quadajet and later with a Weber. And finally throttle body fuel injection (TBI).<br /><br />The confused is enhanced by the fact that the earlier motors were rated by the horsepower at the crankshaft and later were rated by horsepower at the prop shaft.<br /><br />In summary:<br /><br />"Gen I" 2bbl (4.3L)- 185hp at the crank<br />"Gen I" 4bbl (4.3LX)- 205hp at the crank<br />"Gen II" 2bbl (4.3L)- 155hp at the prop<br />"Gen II" 4bbl (4.3LX)- 180hp at the prop<br />"Gen +" 2bbl (4.3L)- 190hp at the prop<br />"Gen +" 4bbl (4.3LX) -210 hp at the prop<br />"Gen +" EFI (4.3LXH)- 220hp at the prop<br /><br />If I've missed anything someone else will fill it in.<br /><br />Chris...........
