I have an 86 Iroc w/ the V-belt setup and I was wanting to know what is needed to change it over to a serpentine setup. What will I need off a donor car and what about my A/C compressor and my alternator will I have to get new ones?? Anything else I will need to change?? Thanks. I was thinking about ordering a kit from Hawks Thirden Parts, what do you guys think about that. I think it is about $250.00

 

Here's what you need to know.
http://sethirdgen.org/serpentine.htm

 

Thanks for the info. John, that helped me very much. I'm glad my brother works at a parts store and he can warranty parts out for me. Ha Ha!!

 

If he warranties parts out to you then he has to supply a core, which will likely be different than the warrantied part, so the store will not get credit for it from the manufacturer. Sucks for the place he works for.

 

OH well, it's good for me. Ha Ha!! Saves me money.

 

One more thing for some folks: 86-down heads don't have all the right holes for the serp. stuff to bolt up to. Otherwise, I'd be running it.

Matthew

 

if the bolt hole in the cylinder head required by the pass.side mounting bracket isnt there-temp up the bracket with the existing holes and carefully center-punch thru it to the head to mark center, pull off the bracket, drill 1/8th inch pilot 1 inch deep, followed by 5/16 dia, followed by 3/8-16 bottom tap and now yer in there. that is, if the early heads were talking of arent really the "early" (no accessory bolt holes) generator style items, prolly could drill all them out too if'n you like challenges -not- ive done a few at my shop and the only hole usually missing is the one on the rt. head. g.m must have been planning for decades (at least since 1970) to put the hole there because the casting is spot faced smooth where ya end up drilling. i dunno it, works for me. probly for you also. hope it helps-

 

Incorrect. I am running 86 down heads and have the '89 serpentine setup.

 

Incorrect. You are running aftermarket heads with 86-down style intake pattern, '86-down style perimeter bolt valve covers, and '87-up accessory holes.

I am running iron GM '86 heads. Hence I can't run serp, and you can.

 

the 441 castings im running on the 406 are so pre anything that the spark plugs are 13/16 hex 14mm. thread, 3/8 reach. can ya believe R44 AC plugs? and still, hanging off the front of the motor, is a complete, fully functional serpentine accessory drive set-up that i put there to get that procharger to fit. honest.

 

I stand corrected, sorry.

 

I have an 86 iroc lb9 that I want ot toss my serpintine on the, does this mean it wont bolt up? so I guess I gota drill them out. or are these only some heads?

 

The heads can be drilled, right into the water jacket. Not worth it.

 

Will the serp setup off of a TBI car work for a TPI car?? Like off or a 90 RS or something like that?? Are they all the same??

 

im sorry you interpreted the drilling portion of the swap job to include actually penetrating into the water jacket. it certainly could happen if one was unaware of all of the possibilities of boo-boos that await when performing a modification of this type. if unable to muster the skill required to actually pay heed and control the drill bits depth of penetration into the casting then i would recommend not installing the serp.set-up, install it minus the attaching fastener required at that spot, or, locate and utilize an individual with a level of skill commensurate with what is required to do the job without drilling into the water jacket. even though it sounds scary, think of all the bolt holes that actually do go thru to coolant passages as designed by the factory engineers. hmmmm, could the application of the same type of thread sealant that is used there also be used in this application if such a drill thru happened? so to clarify- please understand that a finite amount of casting is what separates the air and coolant and drill accordingly. safety goggles and fire extinguisher along with proper and adequate lighting should also be considered as a requirement prior to starting this job.

 

tbi and tpi nearly identical parts wise-2 or 3 of the small black reinforcement rods that tie to the intake and exhaust manifolds differ. also a t.s.b. exists concerning the addition of another brace from the a/c rear to the front of the intake, on the first one or 2 years of production. whatever year the belt routing was changed the factory also started putting on that brace as original. so to use tpi or tbi either way will just entail buying correct braces-fairly inexpensive parts if i recall properly.