NEW Dart™ Big M Block
Featuring upgrades including...
• True Priority Main Oiling System
• Siamese cylinder bores
with extra-thick walls that resist cracking and improve ring seal for more power
• Extra thick decks ensure reliable head gasket seal
• Blind head bolts don't go through to water jacket
• Splayed outer bolts
on middle main bearing caps
• All OE bolt holes for starter, clutch ball, etc...
• MADE IN THE USA
Short Block Features
• Deck height 9.800"
• Rods 6.385
• Stroke 4.250
• Bore 4.500
• 2618 Forged Pistons
• Scat forged crank
• 4340 Forged Rods
• Brass frost plugs
• Moly piston rings
• HP cam bearings
• Howards hydraulic roller camshaft
• Internally balanced
Camshaft Advertised Duration
Camshaft Duration @ .050"
Dart™ Pro 1 Cylinder head castings
►325cc Intake Runner
►121cc combustion chamber volume
►2.25 stainless intake valves
►1.88 stainless exhaust valves
►Rectangular intake port shape
►Howards HP valve springs
►Howards chrome moly valve spring retainers
•Dart aluminum heads are cast from virgin 355-T61 aerospace alloy for superior strength and integrity.
►Manganese bronze valve guides extend cylinder head life and reduce stem wear.
►Hardened exhaust seats are compatible with unleaded gasoline
►Multi-angle intake seats and radiused exhaust seats dramatically increase airflow.
►Spark plug holes are machined for gasketed 3/4" reach plugs.
►Heart shaped 121cc chambers improve combustion efficiency.
►Raised spark plug location improves flame travel for a quicker, more complete burn, producing more power.
►Exhaust ports raised .300" to improve flow
►Cast, machined and assembled in the USA
Additional Parts Included
• SFI rated harmonic balancer
• High capacity oil pan
• Chrome timing cover
• Pro Star polished aluminum valve covers