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RPM AIR-GAP DUAL-QUAD
OVAL PORT (1500-6000 rpm)
RECTANGULAR PORT (1500-6000 rpm)
Designed for street 396-502 c.i.d. Chevy V8s. These intakes stand 7/8" taller than the low-profile C-66-R/O dual-quad intake and offer performance improvements in the 1500-6500 rpm range. The large runners feature our unique Air-Gap design that separates the runners from the hot engine valley for a cooler, denser charge. In dyno tests on a ZZ 502 with intake #7522, heads #77489 and #2261 hydraulic roller camshaft, we made 602 hp, 15 hp more than the Performer RPM manifold #7163. Oval-port intake is also available as a complete manifold and carb kit, see Manifold & Carb Kits for more information. |
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| Applications |
Part # |
| RPM Air-Gap Dual-Quad Oval Port (non-EGR) |
#7520 |
| RPM Air-Gap Dual-Quad Oval Port w/ EnduraShine finish (non-EGR) |
#75204 |
| RPM Air-Gap Dual Quad Big Block Chevy Rectangle Port |
#7522 |
| RPM Air-Gap Dual-Quad rectangular port with EnduraShine finish (non-EGR) |
#75224 |
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| Carburetor Recommendations: Edelbrock Thunder Series AVS #1803 and #1804 or Performer Series carb, 500 cfm
 Installation Notes: Neither H.E.I. or mechanical tach drive distributors will fit. #7520: Recommended intake gasket: Edelbrock #7203. Manifold height: A-4.81", B-5.56"; Carb pad height: 5.19". see A/B Measurements. Port exit dimensions: 1.60" x 1.93". #7522: Recommended intake gasket: Edelbrock #7202. Manifold height: A-5.18", B-5.94"; see A/B Measurements. Carb pad height: 5.56". Port exit dimensions: 1.57" x 2.27".
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Chevrolet 396-502 V8
STREET TUNNEL RAM 2-O (3500-7500 rpm)
Designed for use on 396-502 c.i.d. big-block Chevy V8s with large oval-port heads (1975 and
earlier). Ideal for applications such as pro-street or marine where low-end torque is not a prime
factor. Use with Performer RPM cam/kit #7162 for maximum top-end power. |
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| Applications |
Part # |
| Street Tunnel Ram 2-O (base and top) |
#7115* |
| Street Tunnel Ram 2-O (base only) |
#7190* |
| Street Tunnel Ram 2-O (top only) |
#7191* |
| Throttle Linkage (forward) |
#7097 |
| Top Gasket (included with base and top) |
#6989 |
| Performer RPM Camshaft/lifters/lube Kit (high-horsepower) |
#7162* |
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| Carburetor Recommendations:
Performer #1405 (600 cfm), Thunder Series AVS #1805 (650 cfm)
Installation Notes: Top has vacuum outlet for power brakes. Manifold will accept forward mounted carbs.
Distance from carb center to carb center: 9.38". H.E.I. ignition will not clear manifold. Recommended intake
gasket: Edelbrock #7203. Manifold top with bottom height: 10.63". Port exit dimensions: 1.56" x 1.89". |
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Chevrolet 396-502 V8
C-66-O DUAL-QUAD (1500-6000 rpm)
C-66-R DUAL-QUAD (1500-6000 rpm)
Designed for 396-502 c.i.d. Chevys, tests confirmed smooth, consistent part-throttle operation
with a 25 hp gain over Torker II and a torque gain of 30 ft/lbs. over Performer. Will not fit tall-deck
truck blocks. Includes metering rods to calibrate Edelbrock carbs. Carb center to carb center is 6-7/16". Use
with Performer-Plus cam/kit #2162 for low-end torque or Torker-Plus cam/kit #5062 for top-end power.
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| Applications |
Part # |
| C-66-0 Manifold for 1975 & earlier large, oval-port heads (non-EGR) |
#5420* |
| Polished C-66-0 Manifold for 1975 & earlier large, oval-port heads (non-EGR) |
#54201* |
| C-66-R Manifold for rectangular-port heads (non-EGR) |
#5421* |
| Polished C-66-R Manifold for rectangular-port heads (non-EGR) |
#54211* |
| Performer-Plus Cam (high-torque) |
#2162* |
| Torker-Plus Cam (high-horsepower) |
#5062* |
| Performer RPM Cam (high-horsepower) |
#7162* |
| Braided Fuel Line Kit |
#8088 |
| Braided Fuel Line Kit with Endura finish |
#8091 |
| Progressive Throttle Linkage Kit |
#7094 |
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| Carburetor Recommendations:
Performer Series #1405 (600 cfm), Thunder Series AVS #1805 (650 cfm)
Installation Notes: H.E.I. will fit. Recommended intake gasket: Edelbrock #7203 (for #5420) or #7202
(for #5421). Manifold height: A-3.95", B-4.65" see A/B Measurements. Port exit dimensions: #5420 - 1.64" x 1.94";
#5421 - 1.66" x 2.30". |
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Nascar Edition
