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THOSE ARE GOOD PIPES. I RAN THEM ON A 95 SS. MINE WORKED BEST AROUND 8450 ON A DIGITAL TACH. THAT SLED RAN WITH STOCK MACH Z'S AT THE RADAR RUNS. FAST SPECS ARE 490 MAIN JETS WITH A GUTTED AIRBOX OR K&N FILTERS. I RAN THE FILTERS. RICHEN E CLIP 1 POSITION ABOVE O DEGREES. RICHEN E CLIP 2 POSITIONS BELOW 0 DEGREES. ROTARY VALVE TIMING IS 150 DEGREES OPENING AND 80 DEGREES CLOSING. I CUT MY OWN VALVE OUT OF THE STOCK ONE. I WOULD RECOMMEND THE K&N FILTERS. I HOPE THIS HELPS. IF YOU SPEND SOME TIME TESTING YOU WILL BE IMPRESSED WITH THE RESULTS! GOOD LUCK.
 
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