BBC CHEVY BIG M SPORTSMAN BARE ENGINE BLOCK 4.560 FINISHED BORE
- Item #: DRT_31273554
DART BIG M SPORTSMAN
BARE ENGINE BLOCK
With multiple deck heights and bore sizes up to 4.600", the Big M
Sportsman block gives you the versatility to build a wide variety
of engine combinations. A true priority main oiling system oils
the main bearings before the lifters for extra reliability.
- Standard 9.800" and tall 10.200" deck heights available for stroker engines.
- 4.560" bore size with siamesed extra thick cylinder walls to resist cracking and improve ring seal (minimum .300" thick with 4.625" bore).
- Uses +.300" tall Gen VI style lifters. Modification for Gen IV style available.
- Scalloped outer water jacket walls improve coolant flow around the cylinder barrels to equalize temperatures.
- 2 bolt front and rear and 4 bolt interior ductile iron main caps have splayed outer bolts for extra strength.
- Crankshaft tunnel has clearance for a 4.560" stroke crank with steel rods without grinding.
- True priority main oil system lubricates the main bearings before the lifters. Our stepped main oil gallery (9/16" to 1/2" to 7/16") increases the flow of oil to the crank at high rpm, and our front oil crossover eliminates internal oil leaks around the distributor shaft.
- Oil filter pad is drilled and tapped for an external oil pump.
- Lifter valley head stud bosses prevent blown head gaskets.
- Rear main cap uses standard oil pump and two piece seal - no adapter required!
- Mechanical fuel pump boss, clutch linkage mounts, and side and front motor mounts simplify installation in any chassis.
- Dual oil pan bolt patterns fit standard and notched oil pans.
This block is bored to a Finished bore size 4.560 on SV10
Diamond Sunnen hone using deck plates
This item will ship via Freight Service. Please give us a call at
(423) 288-3881 for a shipping quote to your area, and estimated
We have been in business for over 30 years building
some of the fastest race engines in the southeast with the
best parts around and we are excited to now offer these
parts to you at affordable prices. Our machinists are the
best in the business and our sales staff is friendly and
knowledgeable. Please give us a call with any questions
about our items, we will be happy to talk to you about your