Chevrolet - MARK 4 BOW TIE BIG-BLOCK BARE BLOCKS (TALL DECK)
     Both of these blocks have been discontinued by GM. This page will remain for informational purposes only. Both are Tall Deck design (10.200”) with the only difference between them being bore diameters.
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 MARK 4 BOW TIE 4.250” BORE BLOCK SPECIFICATIONS
Mark IV Bow Tie Block (Tall Deck)
 14044808 and 12370834 are both discontinued and are no longer available.
This page will remain here for information purposes only.
P/N 14044808
      This “tall” version of the heavy-duty Mark IV Bow Tie block is recommended for maximum-effort racing engines with long-stroke crankshafts. Like the short-deck Bow Tie block P/N 10051106, this tall block has siamesed cylinder walls and reinforced decks with blind head bolt holes. It is equipped with four-bolt main bearing caps.
     Technical Notes: This block has semi-finished 4.250” diameter cylinder bores. The distance from the crankshaft centerline to the deck surfaces is 10.20”. It has provisions for a mechanical fuel pump. Casting P/N 14044807. Can be bored to 4.500”.

 MARK 4 BOW TIE 4.250” BORE BLOCK SPECIFICATIONS
Block Material:
Cylinder Wall Type:
Deck Height:
Bore Range:
Cap Bolts:
Cap Bolt Orientation:
Cap Material:		 Cast Iron
Siamesed
10.200”
4.250-4.560”
4 Bolt
Straight
Cast Iron		 Crankshaft Journal Dia.:
Oil Sump Type:
Crank Seal:
Design Max. Stroke:
Weight:
Intended Usage:
Fuel Pump Boss:		 2.75”
Wet
2 Piece
4.250”
269 lbs.
Professional Competition
Yes
Special Features:
 • Boss and Mark IV Style Oiling.
• Note: Crankshaft is Two Piece Rear Main Seal Type.

 MARK 4 BOW TIE 4.495” BORE BLOCK DESCRIPTION
Mark IV Bow Tie Block 4.495” Bore (Tall Deck)
P/N 12370834
      This block is the same as P/N 14044808 tall deck Bow Tie block, except it is bored to 4.495”. The deck height is 10.2 inches.

 MARK 4 BOW TIE 4.495” BORE BLOCK SPECIFICATIONS
Block Material:
Cylinder Wall Type:
Deck Height:
Bore Range:
Cap Bolts:
Cap Bolt Orientation:
Cap Material:		 Cast Iron
Siamesed
10.200”
4.495-4.560”
4 Bolt
Straight
Cast Iron		 Crankshaft Journal Dia.:
Oil Sump Type:
Crank Seal:
Design Max. Stroke:
Weight:
Intended Usage:
Fuel Pump Boss:		 2.75”
Wet
2 Piece
4.250”
269 lbs.
Professional Competition
Yes
Special Features:
 • Boss and Mark IV Style Oiling.
• Note: Crankshaft is Two Piece Rear Main Seal Type.