SHO NUT Performance 3/16” thick Phenolic Intake Manifold Spacers

 

Phenolic Intake Spacers go between the Intake Manifold and the cylinder heads.  They are used to reduce heat soak between the heads and intake manifolds. The air entering the engine is thus cooler and denser, potentially providing more power. In warm weather, blocking off the coolant lines that warm the throttle body also helps to reduce the air temperature.

 

They are available, on the Performance page, however, we have not tested them yet, so selling them now would be selling them 'untested'.

 

We also know from preliminary testing that they will cause the intake to rub on the hood liner if the runners are not shaved. We can shave your runners for you as the special jig will not be available locally, so what we do is send you a loaner set and shave your matched runners and return them to you.  You would then return our loaner set.  3/16" is taken off, which is the thickness of the spacers. The price for shaving your runners is indicated on the Performance Page.  Alternately, we can take your set back as a core, if you decide to simply keep the loaner set.

 

If you remove the hood felt, the runners should fit unshaved without rubbing. However, if you have an EGR valve bolted to the driver's side of the intake manifold at the rear, the runners will have to be shaved as you would not be able to bolt on the valve with spacers and an unshaved manifold. All California cars and all ATXs have EGR valves.

 

The spacers are deliberately made smaller than any stock SHO runner so that with core shift, the spacer opening will never be too large. Each individual spacer is then port matched to the runner by the purchaser. This will be quite easy - just bolt the spacer to the runner and enlarge it to match the opening with a dremel.

 

If you have had your intakes port matched, they may have to be rematched after the runners are shaved.