porting my preformer rpm

I have a set of afr 205's is it worth porting my preformer rmp or should I just go to the airgap? my problem is the shaker hood fits with the rpm, and with air gap I will have to mod the hood hole. what do you guys think?

The RPM and the air gap have exactly the SAME PORTS-- No differance what so ever. Do not waste your time porting the manifold, very little or NO PAYBACK

JOE SHERMAN RACING ENGINES

J

Originally Posted by BIGJOE

The RPM and the air gap have exactly the SAME PORTS-- No differance what so ever. Do not waste your time porting the manifold, very little or NO PAYBACK

JOE SHERMAN RACING ENGINES

J

Joe, this is true with the 302 series engines, but Edelbrock made the 351W Air-Gap a different animal. It's just as tall as the Victor Jr, and larger inside than the standard RPM.

Dimensions...

Performer

Ford 351 Windsor V8
PERFORMER 351W EGR (idle-5500 rpm)
Designed for street Ford 351-Windsors with EGR. #3781 is stock replacement/street legal part for 351-W 2V V8s; 1972-87
Manifold ht: A-4.00", B-5.12" (w/1" EGR adapter #8053), see A/B Measurements. Port exit dimensions: .96" x 1.74".

Performer RPM

Ford 351 Windsor V8
PERFORMER RPM 351W (1500-6500 rpm)
Designed for 1969 and later 351 Windsor Ford V8 high-performance engines with Edelbrock Performer RPM cylinder heads, modified OEM cylinder heads or equivalent. The dual-plane design offers good throttle response with excellent top-end power for the street.
Manifold Height: A-4.30", B-5.50" see A/B Measurements. Port exit dimensions: 1.05" x 1.86".

Performer RPM Air-Gap

Ford 351 Windsor V8
RPM AIR-GAP 351W (1500-6500 rpm)
Designed for street and high performance 351-400+ c.i.d. 351-W Ford V8s, the RPM Air-Gap incorporates the same race-winning design that's been used on our Victor Series competition intakes for years. The air-gap design features an open air space that separates the runners from the hot engine oil resulting in a cooler, denser charge for more power. Larger cross sectional area and a taller carb flange than #7181 for compatibility with large displacement, stroker 351-W based engines. Includes nitrous bosses.
Manifold height: A-5.31", B-6.19" see A/B Measurements. Port exit dimensions: 1.07" x 1.88".

Victor Jr.

Ford 351 Windsor V8
VICTOR JR. 351-W (3500-7500 rpm)
Designed for competition 351 Windsor Ford V8s
Ideal for both oval track and drag racing engines operating between 3500 and 7500 rpm. Runners have a 2.70 square-inch cross sectional area.
A-5.75", B-5.75"