Ok I have heard that offenhauser intakes are the hot ##### and outperform both Edelbrock and Holley/Weiand when it comes to the Ford 400. Before I ask any other questions, is this true? If so, which intake do I want? Their "Dual Port 360" or the "360 Equa-Flow"? It seems to me that the Dual port costs more, which tells me they are the better performer. I am totally clueless though. Any help would be greatly appreciated. An Offy website address would also be nice. Thanks guys.

 

There's a good website for 351C intakes. They don't make this many for the 400, but these can be used if you use an aftermarket spacer/adapter. The descriptions can give you some idea how a 400 intake version of these intakes will perform.

http://www.asajay.com/intakes.htm


In no particular order, here's a list of intakes for the 351 C:
Ford Boss 351 intake (p/n Dl Zx-9425-DA)
- low rise dual plane with Holley carb bolt pattern
Edelbrock Performer 351 4V (P/N 2665)
- low rise dual plane with Holley carb bolt pattern
Edelbrock F-351
- low rise dual plane with Holley carb bolt pattern
- obsolete, replaced by Performer 351 4V
- runner ports are smaller than intake ports for increased velocity
Edelbrock Performer 351 2V (PIN 2750)
- low rise dual plane with Holley carb bolt pattern
Ed elb rock Torker 351 (PIN 2760)
- high rise single plane with Holley carb bolt pattern
Edelbrock Victor 351 AH-lI (PIN 2990)
- air gap high rise single plane with Holley carb bolt pattern
- for raised port aluminum SVO heads (C302) on 9.2" deck height Cleveland and SVO blocks
- requires Windsor style water passages in heads
- waterneck section cast into manifold
Edelb rock Victor GN 351 -Y (2960)
- air gap high rise single plane with Holley carb bolt pattern
- for raised port aluminum SVO heads (Yates) on 9.2" deck height Cleveland and SVO blocks
designed for NASCAR Busch Series and Winston Cup engines (approved by NASCAR for Busch Series, Super Truck Series and Winston Cup)
no waterneck provisions in manifold.
Edelbrock Victor 351 -Y (2991)
- air gap high rise single plane with Holley carb bolt pattern
- for raised port aluminum SVO heads (Yates) on 9.2" deck height Cleveland and SVO blocks
- designed for circle track racing applications
- no waterneck provisions in manifold
Offenhauser Dual Port 351C-4V (6013-DP)
- dual port design (runners split into top and bottom sections, plenum split fore and aft, primaries feed longer path lower runners, secondaries feed shorter path upper runners), Holley carb bolt pattern
Offenhauser Dual Port 351C-4V (6014-DP)
- dual port design (runners split into top and bottom sections, plenum split fore and aft, primaries feed longer path lower runners, secondaries

feed shorter path upper runners), spread bore bolt pattern
Offenhauser Dual Port 351 C-2V (6011 -DP)
- dual port design (runners split into top and bottom sections, plenum split fore and aft, primaries feed longer path lower runners, secondaries feed shorter path upper runners), Holley carb bolt pattern
Offenhauser Dual Port 351 C-2V (601 2-DP or is it 6111 -DP)
- dual port design (runners split into top and bottom sections, plenum split fore and aft, primaries feed longer path lower runners, secondaries feed shorter path upper runners), spread bore bolt pattern
Offenhauser Turbo Thrust 351C
- tunnel ram with various tops
- part number: 5935 base, 5936 single quad top, 5938 dual quad top, 5993 single spreadbore top, 5937 Holley single Dominator top, 5983 3 Weber IDA top, 6102 special low volume single quad (Holley or spread bore) top
Oflenhauser Port-O-Sonic 351C-4V (6120)
- high rise single plane with Holley carb bolt pattern
Offenhauser Port-O-Sonic 351 C-4V (6121)
- high rise single plane with spread bore carb bolt pattern
Offenha user Port-O-Sonic 351 C-2V (6122)
- high rise single plane with Holley carb bolt pattern
Offenhauser Port-O-Sonic 351C-2V (6123)
- high rise single plane with spread bore carb bolt pattern
Offenhauser 360 Equa- Flow 351 C-4V (5964)
- high rise single plane with Holley carb bolt pattern
- short runner design with split plenum (side-to-side), plenum divider cut down and/or windowed
Offenhauser 360 Equa-Flow 351 C-4V (5966)
- high rise single plane with Holley Dominator carb bolt pattern
- short runner design with split plenum (side-to-side), plenum divider cut down and/or windowed
Offenhauser 360 "Single Quad rajet High Rise" 351 C-4V (5965)
- high rise single plane with spread bore carb bolt pattern
- probably same as Equa-Flow
Offenhauser Dial-A-Flow 351C-4V (6127)
- high rise single plane with Holley Dominator carb bolt pattern
- has interchangeable "turtles" to adjust plenum volume and floor shape
Offenhauser Dial-A-Flow 351C-2V (6128)
- high rise single plane with Holley Dominator carb bolt pattern
- has interchangeable "turtles" to adjust plenum volume and floor shape
Weiand X-Celerator 351 V-4V (7517)
- low rise single plane with Holley carb bolt pattern

Weiand X-Celerator 351 V-2V (7516)
- low rise single plane with Holley carb bolt pattern
Weiand Hi-Ram 351 C-4V dual Holley tunnel ram
- tunnel ram for dual Holleys
- p/n 1996 for '660' carbs
- p/n 2994 for Dominators
Holley Street Dominator 351 C-2V (300-12)
- low rise open plenum single plane with Holley (?)carb bolt pattern
- universal fit for both 2V and 4V heads
Holley Strip Dominator 351 C-4V (300-13)
- high rise air gap open plenum single plane with Holley carb bolt pattern
FPP 4145 (mfg by Blue Thunder) 351 C-4V (p/n 4145)
- high rise dual plane with Holley carb bolt pattern
FPP 4145B (mfg by Blue Thunder) 351C-4V (p/n 4145B)
- high rise dual plane with Holley carb bolt pattern
- same as FPP 4145 except the heat risers are blocked, the plenum divider is cut down one inch and the carb flange enlarged
FPP 4146 (mfg by Blue Thunder) 351 C-4V (p/n 4146)
- high rise dual plane with Holley carb bolt pattern
- same as FPP 4145 except the carb flange is machined for a Holley Dominator carb (1050 CFM)
Notes:
- Ford SVO markets various Edelbrock intakes under different p/n's.
- Still need info on:
factory Ford intakes (HO, CJ, etc) Australian Cleveland intakes Inglese Weber intake Hall Pantera Weber intake Ford intake for Autolite inline carbs 3x2 bbl intakes
Rousch racing intakes Bud Moore racing intakes supercharger intakes

 

I have heard that the dual port offy manifolds are nothing special; apparently they work better once the split between the runners is removed!

 

Don't remove the split between the runners!! That's the whole magic of these manifolds! If you read the information in P.A.W. next to the price listings for these manifolds you'll see what I mean. If you cut out the split between the runners all you're going to end up with is a single plane manifold! That doesn't really sound or flow like a dual plane manifold does it? And yes, you want the dual-port 360* because of it's all-around streetability.

:-staun :-X12

 

The 360 Equa-flow and the 360 dual port are 2 different intakes. They both have a center divider that seperates the left and right side of the engine. That makes the port volume similar to a dual plane design. Removing the center divider would ruin the benefit of the smaller volume and kill low to mid range power.

The 360 dual port has an additional divider that seperates the primary and secondary side of the carb. Mainly for improving gas mileage I think. I believe this is the what was meant by the split between the runners being removed. Not the center divider.

 

are these spread-bore intakes?