Drove truck over the weekend, sunday engine light comes on and codes show misfire 2 and 6 cylinder. If the Check Engine Light comes on, you may find any of the following codes: P0505 to P0509 idle control circuit codes. Having been surfaced at least twice in their long life, our heads ended up with 52cc combustion chambers (right on the minimum service limit). Engine Stalls (Check Engine Light May or May Not Be On) Stalls typically occur when the engine is idling or slowing.
The heads were treated to surfacing and a fresh valve job using the factory 1.78/1.45-inch valve sizes. Since all 289 heads flow the same and given the expense of original Hi-Po heads, we chose to build a replica set using '66 C60Z castings that already featured the slotted pushrod holes. These features make the Hi-Po heads both desirable and expensive, but any of the more common pre-'66 heads can be converted to Hi-Po use by drilling and tapping for screw-in studs and upgrading the valvespring package (there is no need to cut spring cups). While we try to get as close as possible to the exact part, it is not always possible.
The Hi-Po 289 heads offered a few desirable features, including screw-in rocker studs (no guide plates), cast-in valvespring bosses, and slotted pushrod guide holes (something shared with nearly all pre-'66 heads) that eliminated the need for either guide plates or rail rockers. Home > Crate Engines > Ford - 302 Small Block V8 > 306 cubic inches > GT > CHP GT Crate Engine - Ford 306 Flat Top, 9.70 : 1: Image may be a representation of product. Also, you can tell if the fan blades or shroud on the radiator are damaged just by looking at them.
Check the bolts and clips to see if they are loose. A visual inspection is enough to find out the problem. The original Hi-Po did receive a special set of cylinder heads, but not one that necessarily provided a power advantage. A loose or damaged engine fan can also be the reason for engine ticking or tapping noise.
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