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Road Race Mustang Engine Build - Iron Lung

Road Race Mustang Engine Build
Drag racers go for sexy, thin-waisted... 
   
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Road Race Mustang Engine Build
Drag racers go for sexy, thin-waisted piston pins, but road racers are in for the long haul and prefer a more voluptuous slathering of material in the pin wall. To better package the oil ring, these suitably thick units measure 0.912 inch in diameter rather than the common 0.927-inch option. Griggs wants the pin out of the oil-ring groove.
Road Race Mustang Engine Build
There are no tricks in the... 
   
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Road Race Mustang Engine Build
There are no tricks in the Griggs AI engines' "packaged parts," such as rings and bearings. These Childs & Albert plasma-moly rings are the standard fitment (Griggs has run Total Seal but doesn't insist on them). Naturally, they are file fit. Bearings are Clevite HP bearings, occasionally with extra clearance on the mains, depending on how the crankshaft measures.
Road Race Mustang Engine Build
Griggs' standard cylinder... 
   
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Road Race Mustang Engine Build
Griggs' standard cylinder head is the Trick Flow Track Heat. This head has little trouble spooling up 400 hp, so it needs minimal preparation from Griggs. This includes running Trick Flow swirl-polished, stainless-steel valves and 10-degree locks, Trick Flow chrome-moly retainers, and Trick Flow springs. The spring pressures are checked, of course, and occasional adjustments are made. Bruce says they check their valvesprings after every race, but find they're typically good for one season.
Road Race Mustang Engine Build
While the Track Heat already... 
   
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Road Race Mustang Engine Build
While the Track Heat already has a compact combustion chamber, Griggs mills the heads to raise the compression ratio. Bruce is also considering cutting a small eyebrow in the deck face to provide a steam bleed in the cooling system. That passage, which is present in some aftermarket aluminum heads, seems to deliver slightly cooler water temperatures.
Road Race Mustang Engine Build
What Griggs does chase on... 
   
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Road Race Mustang Engine Build
What Griggs does chase on its heads is core shift and how the bowl/valve seat relationship works out. Some heads need little work, while others require a defi-nite touch with the cutter to align the bowl/seat interface. Naturally, while we were visiting, all the heads in the shop had little core shift. Although we don't have much to show you in this as-cast example, the eyebrow of material at one o'clock to the seat in this photo, and the area just to the left of it, are where the action occurs.A quick port match and knocking off any obvious casting imperfections completes the minor Griggs AI engine port job.

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Road Race Mustang Engine Build  Road Race Mustang Engine Build
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Road Race Mustang Engine Build  Road Race Mustang Engine Build

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