Small Block VS Big Block - A Game of Rat And Mouse

505ci Build sheet
Specifications not listed are the same as stock. Except as noted, all dimensions are in inches or fractions thereof. All prices sourced through Aerohead Racing, JMS Racing Engines, and Summit Racing.
Displacement	505.3ci
Bore x stroke	4.350 x 4.250
Compression	10.51:1
Rod, center-to-center	6.385
Piston deck height	0.00
Chamber volume	118cc
Rod-bearing clearance	0.0024
Crank endplay	0.009
Piston-ring endgap	0.024 top;
	0.022 second
Piston-to-wall clearance	0.0045
Main-bearing cap torque	90 ft-lb*
Rod-bolt torque	63 ft-lb*
Head-bolt torque	70 ft-lb*
*moly-lube

To use a Gen V head on a MK IV block, this cylinder-head water passage must be entirely covered by a gasket made for this interchange. Our Fel-Pro 1017-1 head gaskets did the trick.

On some blocks, the water passage in question protrudes into the valley. Without the proper gasket, coolant leaks are the result. In this case, the block entirely covered the passage, so we were double covered.

Aerohead Racing delivers these heads with stainless, swirl-polished valves, hardened seats, and a nice three-angle valve job that actually opens up the exhaust-port throat a bit (according to JMS). We opted to have Aerohead install 71/416-inch ARP studs with Manley guideplates and upgrade our springs to accommodate our cam lift. It all added up to $1,115. We call it a steal, given our results.

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Small Block VS Big Block - A Game of Rat And Mouse

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