4.3 to 470 swap

[Mithories3980]

But that is where the oil pressure sender goes, right?

Remember that this block is a 1989 S10 Blazer block straight out of a blazer, not a mercruiser. The parts on it are mercruiser though. Does that make a difference?

This is what I have, so this is whats going in...but give me some more information here - what is a balance shaft? Why is it such a problem to not have? Is there anything I need to do to this motor to compensate?

Also remember that this is still better than a 470

EDIT: Also the guy said that this had all vortech heads and other parts on it originally. From what I can tell, the vortechs had a balance shaft?

 

[achris]

The GM 262 V6 has seen many changes over the years. Here's a really brief history of the major changes, and the most important for us with Mercruisers.

The 'first generation' (1985-1992) were basically a '350 with 2 cylinders lopped off'. Being a 90° V6 it was inherently unbalanced, particularly in the 1700-2200 rpm range, and Merc added 'fluid mounts', the type in your photo, in an attempt to damp the vibration.

The next generation, (1992 to mid-1996) known as 'Gen II' (not to be confused with the Alpha One Gen II drive) added a balance shaft, counter-rotating in the cylinder block above the camshaft. These engines had 'standard' mounts, as same as the V8 engines. This engine also lost the mechanical fuel mount, and can only run an electric fuel pump.

Mid-1996 was when the V6 had the Vortec heads added, these are known as Gen+ engines....

Hope this helps...

Chris........

One of the best sites I have seen for V6 history is this one... Much much more detail than I have given here...

http://www.hotsixes.com/chevy-v6/

 

[Mithories3980]

Aah that makes good sense...so there is some engineering to help with the vibration.

back to my oil pressure sender....that hole on the left with nothing in it is the place?

 

[achris]

But that is where the oil pressure sender goes, right?...

It's a while since I have worked on a first gen V6, but I think the oil pressure sender is on the top of the block, just to the port of the distributor...



Chris........

 

[Scott Danforth]

But that is where the oil pressure sender goes, right?

Remember that this block is a 1989 S10 Blazer block straight out of a blazer, not a mercruiser. The parts on it are mercruiser though. Does that make a difference?

The motor doesnt know what its in

vortecs are 1996 and later die to the vortec cylinder head. Balance shafts came out in 1992

Here is some reading. https://forums.iboats.com/forum/eng...history-of-the-4-3-liter-with-casting-numbers

 

[Mithories3980]

Aaaah yes there it is, right by the distributor. Now I see the wire that comes off of it and runs to the gauge and it makes more sense

All very interesting stuff...When I decided to get in to boating, with a solid basic understanding of engines and engine functions, I didn't realize how much more I would be learning. But, this is what I get for refusing to pay people to do things for me!

Its all good though, I thoroughly enjoy learning this stuff from you guys. Thanks Chris!
At the moment I cant think of anything else I need to know but, no doubt I will run into something.

 

[achris]

...At the moment I cant think of anything else I need to know but, no doubt I will run into something.

You haven't even started on the drive yet.... :laugh::faint2:

.... But, this is what I get for refusing to pay people to do things for me!....

Trust me, most for the people who you'll pay don't, a) care as much about your engine as you do, b) want to know.

Don't pay, learn here, get the best results. :thumb:

Chris.......