Butler  Round Port 87cc Aluminum Cylinder Heads, Hyd. Flat Tappet w/ Edelbrock Castings, Made in the USA (Pair)

Butler Performance built w/Edelbrock Castings

Our Heads feature Edelbrock bare casting cores with all machine work done in our head shop. They are fitted with Ferrea Valves, new guides, Comp Cams Springs, Comp locators, Comp Retainers and Locks. with optional upgrades.

These heads are custom built per order by Butler Performance

Cam Specs- Supplying known Cam Specs are recommended so we can verify the spring setup.

Application- Choose your application so we can verify the head ordered has the proper components for your application

Retainer- Choose standard Chromoly, Titanium or PAC Brand Titanium with Pac Locks

Valves- Choose from Ferrea 5000 (Street Performance) or 6000 (Competition Grade) Valves

Stealth- This is the option where we remove logos from the end of the heads and above the exhaust port. Optionally can be painted

Intake Gaskets- Choose to add intake gaskets

Rocker Slotting- We can slot the pushrod holes to accommodate the angle needed for 1.65 ratio rockers

Exhaust Valve Size- Choose standard size 1.66 or upgrade to 1.77

Why Edelbrock Castings?
Butler has had the opportunity over the years to have our own brand castings. The decision was easy for us. Due to the amount of metallurgy expertise needed and inconsistencies in foundries, we chose THE experts in the industry that stay on top quality and consistency. They have proven this through years in the performance aftermarket cylinder head and intake business. Here are a few reasons why the Edelbrock casting, Butler Process machining, high quality parts, and expert blueprinting and assembly, there is no other head on the market that comes close.

• Sand Metal Casting, Core Production, Pattern Making, Heat Treating, Engineering, and Machining all in house, Made in the USA
• Don't miss the details- Heli-Coiled Bolt Holes
• Heli-Coil inserts in rocker stud holes to protect threads during torquing.
• Heli-Coil inserts in exhaust bolt holes to protect the threads while installing and removing headers
• More flow than other aluminum heads on the market, right out of the box before CNC porting

 Butler Built and Blueprinted to same specs as the Edlebrock 61529 out of box cylinder

Performer RPM CNC cylinder heads have the same specifications as our popular Performer RPM Round Port cylinder heads for 1962-79 455 cubic inch Pontiac engines, but feature a CNC machined combustion chamber. The CNC machined chamber results in a consistent and precise chamber for improved flow performance & more efficient combustion. Performer RPM CNC cylinder heads are available in two chamber sizes. The 87cc chamber version is ideal for 10:1 engines and will deliver excellent street performance on low octane fuel. Performer RPM CNC cylinder heads with 72cc chambers are best for higher compression engines. Both are patterned after the same port flange configuration as the 1969-1970 Ram-Air IV Pontiac Round Port cylinder heads. EQUIPPED WITH SPRINGS FOR USE IN HYDRAULIC ROLLER CAMSHAFT APPLICATIONS