3inch collector l/t's going into 2.5inch H-pipe??

Black1987Stang

Active Member
Aug 22, 2004
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Jersey Shore
Will 351 swap long tubes with a 3 inch collector connect right up to the 2.5inch h-pipe I'm using for my 306?...they both have a ball and socket flange....Do they use the same size flanges or will one not fit in the other?

Thanks
 
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BBK has 3.00" collectors, but the ball and socket measure around 2.3-2.4", for improved seal.

Measure the ball and socket opening.

this is the 2nd thread that you said that on, but again, its 2.5" collectors.

you may have to use an adapter when your bolting up the exhaust, but if i was you, i would just try to find a 3" mid pipe from MAC or DR gas.
 
open it up to match your midpipe. i dont see any reason needing 3" anything for exhaust for that setup.

edit: i just noticed you want to use 351 headers on a 306...why not just get headers that are made for your 306?
 
from the summitracing website:

BBK Performance 1516


$299.99
Estimated Ship Date: Today
Overview Application Suggested Parts Warranty
Show All
Brand: BBK Performance
Product Line: BBK Full-Length Headers
Part Type: Headers
Part Number: BBK-1516
Header Material: Steel
Header Finish: Chrome
Header Style: Full-length
Primary Tube Diameter (in): 1 5/8 in.
Collector Attachment: 2-bolt flange
Collector Diameter: 2.500 in.
Tuned: No
Primary Tube Gauge: 16-gauge
Flange Style: Standard
Flange Thickness (in): 3/8 in.
Bolts/Studs Included: Yes
Gaskets Included: Yes
Reducers Included: No
Y-Pipe Included: No
Quantity: Sold as a pair.
 
from the summitracing website:

BBK Performance 1516


$299.99
Estimated Ship Date: Today
Overview Application Suggested Parts Warranty
Show All
Brand: BBK Performance
Product Line: BBK Full-Length Headers
Part Type: Headers
Part Number: BBK-1516
Header Material: Steel
Header Finish: Chrome
Header Style: Full-length
Primary Tube Diameter (in): 1 5/8 in.
Collector Attachment: 2-bolt flange
Collector Diameter: 2.500 in.
Tuned: No
Primary Tube Gauge: 16-gauge
Flange Style: Standard
Flange Thickness (in): 3/8 in.
Bolts/Studs Included: Yes
Gaskets Included: Yes
Reducers Included: No
Y-Pipe Included: No
Quantity: Sold as a pair.

Long Tube Headers Choices with a 3" collector - Corral Forums

Read post #7, #10, and #17.

Bryan Rogers has also told me they are 3.00". I had some and they were 3.00".