Been lookin' at High-Flo Runners and have noticed something..

When looking up part numbers for them, I've come across 2 different sets.. one set for '85-'88 and another for '89-92..

Any reason for this? I would have assumed they'd be the same for all years..

 

Cold start injector for 85-88 models.

 

That's it yeah the presence of a coldstart injector
(extra little runner to an extra little injector - so cute)

FYI - you can use the set with a cold start injector, becase very little modification is needed to make it work for 89-92's.

 

Ok so either one would work i just would need to do a little mod for the 89-92 right ?

Would there be any benift in doing this ?

 

i would just get the ones for your year range.

 

How much extra hp does the large tube runners give ?? No other mods than hedders is it worth buying these?

 

if your planning on doing more in the future, it'd be a good thing to buy

 

You must get the set that was desinged w/ your plenum. The early style runners had the cold start injector provisions, but also had the idle circuit routed differently. If you put new style runners on an older plenum, IT WILL NOT IDLE!!!! (ask me how I know). The older runners used the extra tube on the drives side as the idle circuit, whereas the newer runners are delete the tube on the drivers side. Get the runners that match your plenum.