86 turbo headers on 85 grand national

[6 to go]

Well, the flow distribution question is one that RJC Racing
has worked on a lot and he has developed and sells a
power plate to better the flow distribution. I am sure that
Jason could do the same with a modified plenum, if the
demand was there?

 

[Jerryl]

Well, the flow distribution question is one that RJC Racing
has worked on a lot and he has developed and sells a
power plate to better the flow distribution. I am sure that
Jason could do the same with a modified plenum, if the
demand was there?

Actually, I think the "clearance slant" may "help" flow.
If the pressure increases due to the "slant" to the back 2, it will reduce flow.
These are the 2 leaner cylinders anyway on the stock 87 set-up.

Only one way to truly find out . . . 6 WB's, logged.
Not enough of a market for anyone.

 

[ttaowner]

one other thing. IC cars have a hole in the front of the block for the turbo oil drain. this might be your only issue... if you do not have a 109 block you might have to find another place to dump the oil. maybe into the valvecover?

1st things 1st, see what it takes to make it fit.[/QUOTE]

my buddy converted a na v6 to 86-87 ic all he did for a return was run a AN - line down to the fuel pump block off and tap a hole and put a AN- fitting in the there !

easy to do,easy to undo if you ever wanted!

 

[bot]

one other thing. IC cars have a hole in the front of the block for the turbo oil drain. this might be your only issue... if you do not have a 109 block you might have to find another place to dump the oil. maybe into the valvecover?

1st things 1st, see what it takes to make it fit.

my buddy converted a na v6 to 86-87 ic all he did for a return was run a AN - line down to the fuel pump block off and tap a hole and put a AN- fitting in the there !

easy to do,easy to undo if you ever wanted![/QUOTE]

I saw a pic of someones return line dumping back into the timing cover. your Idea sounds easyer

 

[ttaowner]

i think all gm block off plates are the same as far as rear wheel drives go! all the aftermarket ones for gm's look the same as far as bolt pattern and shape,probably best to get a flat one on both sides and not one with ribs on it. i thought my buddies idea was brillant ,no need to tap the front of the block anymore! and it below the level of the turbo so it is downhill as opposed to somebodys idea to drain back into the valve cover (which is higher)

 

[bot]

i think all gm block off plates are the same as far as rear wheel drives go! all the aftermarket ones for gm's look the same as far as bolt pattern and shape,probably best to get a flat one on both sides and not one with ribs on it. i thought my buddies idea was brillant ,no need to tap the front of the block anymore! and it below the level of the turbo so it is downhill as opposed to somebodys idea to drain back into the valve cover (which is higher)

Yea that valve cover probbly can only take so much oil back, it might get over loaded with oil

 

[Witte1919]

My 85 is running around just fine with an I/C and an 86 intake with
a 87 turbo, too. Runs great. And it is cheap to do.
for years people said it wouldn't work without massive
amounts of fabrication. There is actually practically no fabrication,
just modify an aftermarket upper plenum to clear the turbo
and cut the upper arm off the alternator bracket.
I had the modified upper plenum flow checked against
the stock plenum and there is no flow penalty, either.
So, what is the reason to do all the work to convert to the 87
turbo location, except for the availability of good D/P's?
None that I can see. Just IMHO

when you say your running the intake are you meaning you swapped over to a 86 intake manifold with the throttle body in the front for the intercooler set up?

 

[6 to go]

yes, I am running with the 86 intake, throttle body, with
the modded upper plenum.