Edelbrock E-Series Cylinder Head Bolt Kit #85512 for Chevy big-block engines

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E-Series Head Bolt Kit #85512 is for 1965-90 Big-Block Chevrolet Mark IV and Mark V engines with Edelbrock 50459, 60459, 60479, 60499, 60559, 61459, 61559, 79539, & 79559 Performer & Performer RPM Cylinder Heads. Not for stock heads.
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Edelbrock E-Series Cylinder Head Bolt Kit #85512 is a high-quality replacement set of bolts with washers for use with Chevy big-block engines equipped with Performer and Performer RPM aluminum heads. This E-Series bolt kit can be used on all Mark IV and Mark V engine blocks. E-Series bolts have a yield tensile strength of 190,000 PSI for strong and reliable loading with generous filleting throughout to eliminate stress risers. Bolt threads are rolled after heat-treating for superior form and strength, while a small hex head provides extra space for socket clearance in tight situations. E-Series Cylinder Head Bolts have a durable black oxide finish with sealer and come with the distinctive Edelbrock “E” stamped into the head.

Features and Benefits

  • For Chevy big-block Mark IV and V engines with aluminum heads; Yield tensile strength of 190,000 PSI; Heat treating with rolled threads for superior form and strength; black-oxide finish with sealer; Edelbrock “E” logo stamped on bolt head.



Manufacturer Edelbrock
Application Application Specific
UPC 00085347855124
Quantity Kit
Thread Type Coarse
Thread Diameter 0.4375 in
Minimum Length 2.25 in
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 #85512 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) 2.25 in, (4) 3.75 in, (12) 4.25, (8) 5.25 in
Material Chromoly