David Lloyd's Butler Performance built 421 Tri-power engine on the Dyno. Bored and stroked to 453 cu.in., compression ratio lowered to 9.4:1 for pump gas, B.P. ported & polished cast iron heads, B.P./Comp hyd roller cam. Going in David's 1965 GTO. www.butlerperformance.com #ButlerPerformance #Pontiac | Butler Performance Pontiac

Roger Bolliger’s Butler-Powered 700 HP Trans AM Race Car All-aluminum Pontiac engine built by Butler Performance We offer each individual part of this build on our website, AND we offer all of this combo in complete KIT form (shortblock and longblock kit versions) that is ready for you or your builder to assemble. For questions about this or to get a free quote started, email us at tech@butlerperformance.com. And for details on what we sell or to learn more about the “Butler Process” check out o