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Interesting performance from an OEM 4V Intake

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A Boss 351C like build, but a 383 ci  @7000 RPM

First runs with a Holley Strip Dominator Manifold HP 625 at 7300 Torque at 5600 490
Factory Dual Plane with .500 divider cut down HP 585 at 7000 Torque at 5100 470 



Ford generally did not CUT the dividers, they used cutout
spacers... Many 351C owners got the 780 carb & spacer from the 1969-70 Boss/Eliminator 302.  [see pic]




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Posted (edited)
21 hours ago, mjlan said:

That's the aluminum, Boss 351-only intake right?

Yes, it is a Boss D1ZA-CA intake...   But ALL 1970-73 Ford 351C OEM 4V intakes are the same castings [runners].  The differences are iron - aluminum, and the size of the spread bore... yes even the 'L' intake is a spread bore, the primaries are smaller than the secondaries.

Maisano modified the D1ZA-CA spread to a square bore 850 carb w/ 1-3/4" bores, removed the area between the primary -secondary [increased the intake plenum area, needed for a 383ci+], cut the divider 1/2" allowing the motor to balance the two planes, and allow it to act more like a single plane intake @ 7,000+ RPM.    

Kind of raises questions on the BS tests of the OEM Ford intakes.... 

A 351C ci that will run idle to 6,000+ does better w/ a four hole intake [w/correct bore sized to carb] and a 1/4"- 3/8" cutout or spacer...  depending of how much you spend @ 6,000+





Edited by Q1SVT
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Those are really great numbers with factory heads and 383 CID. Chuck

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