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The newer Ford 429-460 Super Cobra Jet (SCJ) aluminum cylinder heads made by Jon Kaase have been significantly redesigned from the previous Ford Cobra Jet (CJ) aluminum versions. In doing so the valves have been moved in the head placing them closer to the valve cover gasket rail sometimes creating interference with the inside of the bolt hole bosses on the S/T valve covers. While other covers may fit, the S/T covers are triple the thickness and might. In any case a quick few touches with just a handyman's Dremel tool will provide the necessary clearance you might need. You can see the differences in the Kaase cylinder heads by Clicking Here.
CLEARANCING PROCEDURES TO FIT 429-460 S/T VALVE COVERS ON KAASE SCJ ALUMINUM HEADS:
1) The top center bolt relief may need to be ground to clear the pushrod guide plate. The guide plate may instead be ground to clear as well.
2) The bottom left valve cover bolt boss on the inside may need to be ground to clear the valve spring retainer.
3) In rare applications with a extra tall stud girdles, the breather baffle may need to be removed and the baffle mounting blocks may need to be ground smooth. Since the stud girdle covers much of the same area as the oil baffle did, there will be a minimal of change in it's function of oil control to the breather. However, this modification is not needed just to fit on the SCJ heads.
Above shows the clearance points where the S/T valve cover is thicker and more sturdy than other covers allowing a significant amount of material to be removed without weakening the cover and still be stronger than the rest out on the market. You can compare the two modified bosses to the adjacent untouched ones which show how much material was removed to achieve clearance. Keep in mind each engine configuration may be slightly different requiring a trial fit, or valve cover spacers can also be used to provide the necessary clearance while making the valve cover look even bigger and taller yet!
The dotted line represents where the original edge profile was ground away while the yellow shading shows the surface blending area.
(left) The amount of material that can be safely removed is needed.
(right) The ground away spots are where the oil baffle for the breather was mounted. This only needs to be removed when running extra tall stud girdles.
-Special thanks to Ken Roll for the photos
(left) The caliper shows the amount of material that can be safely removed is needed. Note the extra material in the S/T cover (top) versus the Ford Racing cover (bottom) that can safely be removed if needed.