4.3 v6 serp setup

[72tutone]

Just got back from the yd this weekend and I yanked serp brackets and pulleys etc.
I've read on the board that its possible the v6 crank pulley might not work on my SBC. Might require a v8 creank pulley? Can anyone confirm this?

[hugger6933]

No I think the pulley is the same. I know I've taken the 4.3 set ups and put on small blocks before. I am pretty sure the bottom pulley will work for you

[72tutone]

Sweet. That's what I need to know

['68 Newtricks]

Yep, swapped a '92 1500 V6 serp set up onto my blazer's '79 400sb with TBI heads.

that's all I know

[72tutone]

Hmm after more investigation I seem to be running into an issue

I know some say the depth is the issue on the 4.3 pulley but mine seems to be fitting the snout into the stock 8" harmonic balancer. The crank pulley snout seems to big?

Has anyone seen this before?

[hugger6933]

How much too big is it? Can you start all three of the outside bolts? if so start them then run them down then put the crank bolt in and don't think of it again. Most of you pressure [or whatever] is gonna be on the three outside bolts. Jim

[mechanicalman]

Originally Posted by 72tutone

Hmm after more investigation I seem to be running into an issue

I know some say the depth is the issue on the 4.3 pulley but mine seems to be fitting the snout into the stock 8" harmonic balancer. The crank pulley snout seems to big?

Has anyone seen this before?

You need to place that pulley onto the balancer and see if the part that fits into the balancer is tight or if it moves too much. That part needs to be centered and the three bolts are not enough to do that, it has a hub for a reason.

I've read that the balancer is thicker on the V8 and you have to use a V8 pulley anyway.

"had to get a V8 specific crankshaft pulley as the V8 uses a different thickness harmonic balancer and consequently different pulley". See post #6.
http://67-72chevytrucks.com/vboard/s...d.php?t=525910

[WIDESIDE72]

Is the balancer being used the original 6-3/4" from the swp set up or an 8" from a later model lwp set up? I am going to be doing a similar swap soon but since the truck didn't have an engine I am using all of the serpentine parts (brackets pulleys balancer, etc) scored it locally on craigslist already removed. Guy we the engine in his s10 blazer and had bough another engine. Didn't have room for spares. I got all the brackets, braces, pulleys, bolts, two fans two used water pumps (can't figure that one out), power steering pump alternator and an Ac delete pulley for $75. Not to mention the half days time it takes to remove it!

[72tutone]

This is using the original 8" nodular balancer that was in my 72.