Availability: Ships in 2-3 weeks
Butler has developed a new Top End Power Package to wake up the 403 Olds found in the later model Trans Am's. Originally rated at only about 185 hp. This top end kit can push a 403 to upwards of 390hp and 405lbs tq. (with rotating assembly kit). Our kit has all the machine work done for you to simply bolt it on.
Kit includes:
Edelbrock Big Block Olds Heads modified to fit the 403
Features a redesigned 77cc combustion chamber, larger intake valves and refined bowl blending for improved flow. The #61025 Performer RPM head has improved accommodation for a factory-style mechanical fuel pump with spark plug locations moved slightly towards the exhaust valve for optimized combustion. Intake and exhaust ports have been improved over previous designs, and extra material has been added above the intake port for head work. Performer RPM #61025 heads are cast and machined by Edelbrock in the USA and comes complete with the highest quality intake and exhaust valves and valve springs.
Edelbrock Performer RPM Intake, Port Matched in our Shop
Butler/Comp Custom Grind Hyd Roller Camshaft- 276/282, 224/230, .503/.510
Choose Idle Quality:
Morel Lifters
Head Gaskets
Intake Gaskets
Exhaust Gaskets
Valve Cover Gaskets
Stainless Intake Bolt Kit
ARP Head Bolt Kit
Adjustable Push Rod Length Checker
Optional Items:
CNC Head Porting- Increase to 325-330cfm flow
5/16 Pushrods
BOP Polymer Distributor Gear
1.6 Aluminum Full Trunnion Rockers
Timing Set
PTF Drop base shaker unit to offset taller height in intake
