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The Keystone shaker hood is designed to route fresh air to the filter.
But without a sealed box around it, the filter can still suck hot underhood air. Keystone makes a filter box, which is apparently just an Airaid box. It must be modified, as the stock Airaid is too tall. There is no easy way to do this. The best place to start is to cut down the back side just about flush with the lower part of that panel. Then remove the scoop and intake boot so you can see the gap under the hood and start closing and cutting. A shop light stuck into the filter box helps show the gap. The most important thing to realize going in is that the MAF side of the box will have a pronounced slope towards the front; it will not be level like the stock Airaid panel. This is because the underside of the shaker hood slopes toward the front.
Once you are close to getting the hood closed, you can reach your hand into the airbox from the shaker hood opening and feel the gap. Also remember to allow about an index finger's clearance all around to allow for the gasket. Once you get close to the final cuts, screw the box down so that you can be certain of its final installed position. It took about six or seven trips to the cutting bench to get the final cuts. To further shield the intake from underhood air, I covered the box with Thermo-Tec self-adhesive heat barrier, with the edges taped with aluminum duct tape. I scrapped the stock Airaid gasket and used the Ford gasket that seals the hood to the firewall. The stock opening size is only about half the size of the Airaid box, so I wanted to open up the hood. It might not help, but it won't hurt. I lightly coated the top of the airbox gasket with blue carpenter's chalk, then closed the hood to transfer the chalk. I then used 3/4" masking tape to create an inner pattern 3/4" smaller than the gasket impression (to ensure that the gasket has sufficient surface to seal against). The last project is to fab a small plate to cover the gap behind the radiator fluid expansion tank. |
