I TOOK A 455 OUT OF A 70 DELTA 88 HAD IT BORED .30 OVER WITH 8.5:1 PISTONS, STOCK CRANK, C HEADS, COMP ROLLER ROCKERS, NEW SPRINGS, MONDELLO JM-20-22 CAM WITH .512 LIFT, EDELBROCK PERF INTAKE,HOLLEY 750 CARB, MSD BILLET DISTRIBUTOR WITH NO VACCUM ADVANCE AND MSD 6A SPARK BOX,STOCK TYPE FUEL PUMP, DYNOMAX CERAMIC HEADERS, 2 1/2 INCH EXHAUST WITH A FLOMASTER TYPE MUFFLERS, AND A REBUILT TH400 W/ SHIFT KIT AND 2000 RPM STALL . NOW.......THE CAR SOUNDS GREAT BUT JUST MAKES A LOTTA NOISE AND NOT MUCH POWER FROM 0-3000 RPM. I HAVE DRIVEN ALOT OF CARS THAT HAVE HAD SIMILAR REBUILDS THAT ARE ALOT MOR SNAPPY AT THE THROTTLE. I HAVE BEEN TOLD MY ENGINE'S CAM SPEC DO NOT MAKE ENOUGH VACCUM FOR THE REST OF THE RECIPE TO WOK TOGETHER. PLEASE HELP.......
It probably boils down to the fact that it's a naturally aspirated engine with a 8.5-1 compression ratio. So your engine likely makes a lot of torque but more modest horsepower. I don't get it though... don't 1970 455's have high compression ratios closer to 10-1? Did you have it rebuilt so it would run on 87 octane or something?
I'm pretty sure your compression ratio is the weak link though. If you have a hot cam, and big carburetor on a low compression big block, it's most likely not going to unwind until higher rpm's.
Weldon Billet Line Electrically Driven Fuel Pumps Street Bracket Vintage A2005-A, Weldon Billet Line Electrically Driven Fuel Pumps Street Road Off Road D2015-A, Weldon Billet Line Electrically Driven Fuel Pumps Hi-performance Street DB2015-A, Weldon Billet Line Electrically Driven Fuel Pumps Street Outboard D2025-A, Weldon Billet Line Electrically Driven Fuel Pumps Street Outboard DB2025-A, Weldon Billet Line Electrically Driven Fuel Pumps 12 inlet and 10 outlet D2035-A, Weldon Billet Line Electrically Driven Fuel Pumps Pro Stock Modified 2345-A, Race Pumps Billet Piston Fuel Pump - Small Block Chevy used good condition, CVR G242 Fuel Pump Block-Off Plate Billet Aluminum Clear Small Block Chevy, Billet Specialties Fuel Pump Block-Off Plate Aluminum Polished Chevy SB Ea 41120, Race Pumps Billet Piston Fuel Pump - Small Block Chevy, Holley 12-125 HP 125 GPH Billet Base Electric Fuel Pump, New Holley 110 GPH Blue Electric Fuel Pump, Street/Strip, Billet Look, Chevy Small Block Billet Mech Fuel pump block off plate, Aeromotive 16302 Billet Fuel Pump Speed Controller, BILLET ELECTRIC 4-9 PSI FUEL PUMP REGULATOR ADJUSTABLE, Datsun Z 240Z 280Z ZX New Billet Fuel Pump Block Plate, Canton Racing Billet Aluminum Mechanical Fuel Pump Block-Off Plate 21-954, Aeromotive Fuel Pump Belt Drive Billet Aluminum Red Anodized -10AN Inlet Outlet, Race Pumps Billet Piston Fuel Pump - Small Block Chevy, Quick Fuel Holley Carburetor Billet Metering Block Kit Double Pump, Aeromotive Billet Fuel Pump Controller 16306, Holley 12-1400 Dominator Billet Electric Fuel Pump. 105 GPH. 80PSI, Aeromotive 11107 Fuel Pump Billet Hex Drive Universal Each, Aeromotive High Output Billet Fuel Pump 11209, BILLET FUEL PUMP BLOCK OFF PLATE SBC CHEVY BALL-MILLED ALUMINUM BRAND NEW, Aeromotive 16306 Billet Fuel Pump Speed Controller, UNIVERSAL ELECTRIC FUEL PUMP 140 GPH WITH BILLET REGULATOR NEW 12 VOLT, Aeromotive 11203 SS Series Billet 14 PSI Carbureted Electric Fuel Pump 3/8" NPT, UNIVERSAL ELECTRIC FUEL PUMP WITH BILLET REGULATOR AND GAUGE KIT 140 GPH,
