Dart Race Series 4.5 Bore Spacing Aluminum Small Block Chevy Blocks
- Premium alloy: Dart Aluminum blocks are cast from proprietary RMR cast Aluminum alloy for superior strength
- Parts kit included
- 4.500 bore spacing allows bore sizes up to 4.250
- Standard 17 head bolt pattern or optional 19 bolt pattern available
- Deck heights of 8.850, 9.025, 9.075 and tall deck 9.325 & 9.500 versions allow greater versatility for preferred rod ratio and angle
- Raised camshaft .391 (4.912 camshaft-to-crankshaft centerlines) Option for .434 raised cam aLS2o available
- Requires use of remote oil filter. No provision for block mounted filters
- Relocated oil pan raiLS2 are spread .400 per side (.800 wider than stock) to increase crank/rod clearance and reduce windage losses
- Big block camshaft bearings allow the use of cams with larger base circle diameter to improve strength and reduce twisting with cam-driven pumps
- Rear external oil inlets, with crossovers and restrictor provisions located centrally in the valley