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Chevrolet - CNC BOW TIE BIG-BLOCK BARE BLOCK (TALL DECK) | |
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WEB SITE NAVIGATION | |
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GM & SC HOLLEY AFR |
EDELBROCK FLUIDAMPR R&M |
SCAT MSD |
DEMON WORLD |
HUGHES TREMEC |
RICHMOND PROFORM |
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GEN 6 RACING BOW TIE PRO STOCK BLOCK DESCRIPTIONS | |
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Gen VI CNC Machined Tall Deck
P/N 24502502Racing Bow Tie Pro Stock Block This bare block has all 8620 steel main caps and all are CNC machined with 10.200” deck. The Gen V CNC-machined race prepared tall deck Bow Tie block starts with the same casting used in the P/N 10185049 production machined block. All of these blocks feature blind head and accessory mounting bolt holes, a deck configuration that enables the use of any big block Chevrolet cylinder head, and cylinder bores that may be bored to 4.600” diameter while maintaining a minimum wall thickness of .250”. In addition, the new castings design improves engine block life and build ability of the previous generation of Mark IV big block Chevrolet blocks. |
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CNC machined race prepared Bow Tie blocks differ from the production machined Gen V Bow Tie versions
in certain areas. CNC race prepared blocks start from a raw casting and are not “conversions” and
use a rear seal adapter to convert the Gen V production type one piece rear main seal to a Mark IV
type two-piece seal that facilitates the use of a widely available Mark IV style crankshaft. In
addition, 8620 steel bearing caps are put in all locations to further increase the integrity of the
bottom end. The intermediate caps also feature 16° splayed outer bolts which anchor the caps into the strongest section of the block and prevent bearing cap movement under high loads. Bow tie race prepared, as well as production GEN V blocks use priority main style oiling, in which the oil flows from the main gallery near the cam, oiling the cam via a small hole, and directly to the main journals. The main oil gallery on these blocks is relocated and enlarged to 9/16” diameter to allow increase oil flow through the block. The oil cooler provisions found on all Gen V production machined blocks is eliminated so that plugging of this boss is not required when prepared for a racing style oiling system. CNC race prepared Bow Tie blocks have inner head bolt bosses which allow better retention of cylinder heads in high horsepower applications due to cylinder head “lifting” from the block do to high cylinder pressures. The tall and short deck race prepared blocks weigh 288 and 278 pounds respectively which is at least 12 pounds lighter than imitation Bow Tie aftermarket blocks. Casting P/N 24502504. This bare block is the same as P/N 24502500 except it has tall 10.200” deck height. Refer to the page on P/N 24502500 for more information on this block design. |
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GEN 6 RACING BOW TIE PRO STOCK BLOCK SPECIFICATIONS | |
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Block Material: Cylinder Wall Type: Deck Height: Cylinder Bore Range: Cap Bolts: Cap Bolt Orientation: Cap Material: |
Cast Iron Siamesed 10.200” 4.250-4.600” 4 Bolt Splayed 16° 8620 Steel |
Crankshaft Journal Dia.: Oil Sump Type: Crankshaft Seal: Design Max. Stroke: Weight: Fuel Pump Boss: Intended Usage: |
2.75” Wet 2 Piece Mark IV 4.600” 273 lbs. None Professional Competition |
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Special Features: • Fully Race Prepared Machining • Valley Head Bolt Bosses • Enlarged Main Oil Gallery |
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