BBC Head Bolt Kit

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Edelbrock #8551 Head Bolt Kit is for 1965-90 Big-Block Chevrolet 396-454 Mark IV Engines with Edelbrock #50459, 60459, 60479, 60499, 60559, 61459, 61559, 79539, & 79559 Performer & RPM Cylinder Heads. Not for Stock Heads.
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About Edelbrock


The Edelbrock #8551 bolt kit contain a complete set of the highest quality head bolts and hardened washers available. Cold-formed to ensure molecular integrity and heat treated prior to thread rolling and machining. Reduced diameter bolt heads eliminate the need for valve train removal to facilitate cylinder head re-torqueing. Hardened and parallel-ground washers are included. Rated at 170,000 p.s.i.



Manufacturer Edelbrock
Application Application Specific
UPC 00085347085514
Quantity Kit
Thread Type Coarse
Thread Diameter 0.4375 in
Minimum Length 2.19 in
Color Black Oxide
Availability Note Available to Order
Warranty 12 Months
Hazardous Materials Warning WARNING: This product can expose you to Chromium, which is known to the State of California to cause cancer or birth defects or other reproductive harm. For more information, visit
Installation Notes
  • The Edelbrock #8551 is made specifically for big block Chevy V8.; Installation is the same as for original equipment cylinder heads. Consult service manual for specific procedures, if necessary.; For 454 and smaller Mark IV engines, use Edelbrock head gasket #7302, Fel-Pro head gasket #1017-1, or equivalent.; For 454 Mark V engines, use Fel-Pro head gasket #1037 or equivalent. For 502 c.i.d. Mark V engines, use Fel-Pro head gasket #1047 or equivalent.; Be sure that the surface of the block and the surface of the head is thoroughly cleaned to remove any oily film before installation.; Use alcohol or lacquer thinner on a lint-free rag to clean. Apply liquid Teflon or suitable thread sealer to head bolt threads. Torque short bolts to 65 ft./lbs. and long ones to 75 ft./lbs. in three steps following the factory tightening sequence (see Figure 1). A re-torque is recommended after initial start-up and cool-down (allow 2-3 hours for adequate cooling).
Finish Black Oxide
Head Drive Type Hex
Length (8) 2.19 in, (4) 3.95 in, (12) 4.19, (8) 5.25 in
Material Chromoly