283 Main Size NASCAR SB2.2 Series Block CNC-machined, cast iron NASCAR competition block

Name: 283 Main Size NASCAR SB2.2 Series Block CNC-machined, cast iron NASCAR competition block
Brand: CHEVROLET PERFORMANCE
SKU: 809-12480097
Price: 7319.99 USD
Availability: OutOfStock

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283 Main Size NASCAR SB2.2 Series Block

CNC-machined, cast iron NASCAR competition block
9.025" deck height
4-bolt NASCAR-block specific steel mains, 17 degree splayed caps on center 3 mains
4.116" rough bore
4.185" max bore (siamese bores)
Machined for 58mm roller cam bearings
.875" lifter bores
-06AN water drains
45 degree -10AN front oil feed and valley scavenge
AN O-ring pipe plugs
(4)Center lifter valley drains (drilled & tapped)
Steam holes drilled between cylinders .750" below deck surface
1/2" NPT water hole on each side of block
Dry sump only(no oil filter boss)
SB2.2 Lifter pattern and lobe sprayers
Tested to over 800 horsepower!

Features

Cast iron block
CNC-machined for +/- 0.001'' tolerances
SAE 8620 steel 4-bolt mains (20° splayed caps on the three center mains)
Extra-thick main bearing bulkhead machined at 5°
Priority main oiling system
Siamese bores
Nominal wall thickness of cylinder bores is 0.340''
Enlarged cam bosses allow custom machining for larger bearings
Bearing cap inner bolts spread 0.210'' to accept machining of 400 journal crankshafts
Extra-thick deck surfaces have blind-tapped head bolt holes for superior head gasket sealing
Cylinder decks, front and rear of case, oil pan rail surfaces, and head dowel pins are blueprinted
Technical Notes
Check timing system clearance before engine assembly
Non-standard cam bearings required (Click More Info below)
2-piece rear main crankshafts and pre-1986 oil pans required
Billet wet sump rear main cap can be adapted to dry sump with plugs
Some aftermarket mechanical roller lifters may require clearancing at top of lifter bores
Lifter valley oil scavenging boss (below bellhousing flange) and oil dipstick holes are not drilled