C4 General Discussion General C4 Corvette Discussion not covered in Tech

what are the basic mods for an 86?

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Old Jan 29, 2007 | 08:09 AM
  #21  
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Originally Posted by 65Z01
Does his '86 have the iron heads (early) or Al heads (late)??
Not sure, haven't had time to get the numbers and run them to see but I know his heads have the bolts pattern around the perimeter of the valve covers (not the bolts in the middle of the valve covers) if that helps any??

Originally Posted by 65Z01
When doing LT headers go with ceramic coated, they will flow better, last longer, look better keep the engine compartment cooler; well worth the extra $$. Try Summit for some headers. Consider that headers & cats may cost $600 with a gain of say 20chp or more; that comes to $30/chp, not too shabby is it.
We'll check into it for sure thanks alot for that hp break down which sounds pretty decent.. Im guessing that's to the crank?

Originally Posted by 65Z01
Does he need to run cats? If so I would consider having two hi-flow bullet cats welded into the front Y-pipe (of the new headers) and go to true duals.
He has cats now but we would love to eliminate them since it won't be driven much at all and we'd like to have the hp increase of not having them but we're unsure if we delete them would this cause a error code or something?

Originally Posted by 65Z01
Install: a 160deg T-stat & fan switch; cut-back spark plugs. These two mods are nearly free and should add maybe 10-15chp.
Could you explain more on "cut-back spark plugs".. are you talking about using smaller or larger gapping?
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Old Jan 29, 2007 | 08:13 AM
  #22  
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Also,

anybody running a different chip? I've seen a few stage 1 or 2 chips for sale somewhere I can't remember where but they claimed to be a 20hp increase but with my experience off the shelf chips tend to suck.. im not sure with these cars so anybody have any suggestions on what to look for to run mostly stock with the few bolt ons listed in this thread?
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