Edelbrock Engine Cylinder Head Bolt Washer Set

Edelbrock E-Series Cylinder Head Bolt Washer Sets: Purpose-Built for Performance Heads

When you're bolting up a set of Edelbrock aluminum cylinder heads, the fasteners holding everything together are every bit as important as the heads themselves. That's why Edelbrock developed their E-Series Cylinder Head Bolt Kits — a line of purpose-matched bolt and washer sets engineered to work in precise harmony with Edelbrock's own aluminum head castings across a wide range of classic American V8 platforms.

The need for a dedicated washer set isn't just a formality. These kits are required when installing Edelbrock heads on an engine previously equipped with cast iron heads — with aftermarket aluminum heads, a hardened washer is necessary, and the kits also include longer bolts to compensate for the added thickness of those washers. Skipping this step risks improper clamping loads, potential head gasket failure, and damage to the soft aluminum seating surface — none of which you want after investing in a quality set of performance heads.

Engineering Behind the E-Series

Edelbrock doesn't simply re-box generic fasteners. The E-Series cylinder head bolt washer sets are built to exacting performance standards throughout. E-Series bolts carry a yield tensile strength of 190,000 PSI for strong and reliable loading, with generous filleting throughout to eliminate stress risers, and threads that are rolled after heat-treating for superior form and strength. A small hex head design also provides extra socket clearance in tight engine bay situations. The bolts feature a durable black oxide finish with sealer and come with the distinctive Edelbrock "E" stamped into the head — a subtle but satisfying detail that marks them as genuine Edelbrock hardware.

Wide Platform Coverage

Edelbrock has developed E-Series kits to match their cylinder head lineup across many beloved American V8 families. The #85502 kit is a high-quality replacement set of bolts with washers for small-block Chevy engines equipped with Edelbrock Performer RPM aluminum heads. The #85512 addresses Chevy big-block engines running Performer and Performer RPM aluminum heads. The #85612 covers 1961–1979 Pontiac 326–455 engines paired with Edelbrock Performer D-Port cylinder heads. Chrysler big-block builders and Oldsmobile enthusiasts are similarly covered by dedicated kits matched to their respective Edelbrock head part numbers.

Why Match Your Fasteners to Your Heads?

Performance engine builders know that a cylinder head assembly is only as reliable as its weakest link. Using the correct bolt and washer combination ensures proper torque retention, protects the aluminum deck surface from galling under load, and maintains consistent clamping force across the head gasket over repeated heat cycles. Edelbrock's integrated approach — designing the bolt kits alongside the heads themselves — takes the guesswork out of spec'ing the right fasteners for your build.

Whether you're refreshing a street cruiser or building a dedicated track engine, pairing genuine Edelbrock E-Series cylinder head bolt washer sets with your Edelbrock heads is the straightforward path to a properly sealed, reliably torqued engine top end.