Technical Specifications of...
Merlin Pro Cast Iron Blocks

Material: High Density Cast Iron
Deck Height: 10.200”
Deck Thickness: .600" minimum
Cam Bearings: Standard GM
Main Bearings: Standard Chevrolet (2.750")
Rear Main Seal: 2-piece Chevrolet Mark IV
Camshaft Location: Stock or raised (+.400")
Lifter Bores: Indexed (stock .843" bore)
Bore: 4.490" (hone to 4.500")
Maximum Bore: 4.625"
Cylinder Wall Thickness: (nominal .200" @ 4.600" bore)
Water Jackets: Expanded for better cooling
Lubrication: Priority main oiling system
Filtration: Integral mount for spin-on filter
Oil Pan Rails: Dual pattern, OEM Chevy or DRCE
Crank Clearance: Up to 4.375" crank (w/H-beam) standard—can be clearanced for 4.500". Raised cam block can go up to 5.850" stroke
Main Caps: Splayed billet steel (1/2") with dowels
Fuel Pump: OEM mount
Starter: Dual left and right mounts
Motor Mounts: Dual (front and side)
Cylinder Head Holes: Blind tapped to prevent leaks
Weight: Approximately 292 lbs.