1 3/4" vs. 1 5/8" long tubes

R

Rockin GT

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May 9, 2006

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Aug 2, 2008

#1

• Aug 2, 2008

• #1

Which size is better for my application? My exhaust valves are 1.550" I may add a supercharger in a couple years. Currently running 300 rwhp. I'd appreciate any guiddance or links to relevant test data. Thank you.

 

EMW150

Founding Member

May 22, 2000

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Roaring Spring,PA

Aug 3, 2008

#2

• Aug 3, 2008

• #2

Definately go for the 13/4".

 

R

Rockin GT

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#3

• Aug 3, 2008

• #3

Thank you. Will the 1 3/4's fit w/ the 7 qt pan ok?

 

EMW150

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May 22, 2000

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Aug 3, 2008

#4

• Aug 3, 2008

• #4

Rockin GT said:

Thank you. Will the 1 3/4's fit w/ the 7 qt pan ok?

Click to expand...

Which brand headers are you looking at? The BBKs fit pretty good. You shouldn't have any trouble with pan clearance unless the DSS pan is different than most. A lakewood scattershield would need some grinding near the starter, but other than that they fit pretty good.

 

R

Rockin GT

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Aug 3, 2008

#5

• Aug 3, 2008

• #5

I should be ok then. I'm planning on getting the ceramic coated BBKs. The DSS pan is a modified stock pan w/ a wider bottom portion of the reservoir. The MAC LTs I have now don't have a lot of clearance to the pan and required some reshaping near the starter. My main complaints w/ the MACs though is frying my clutch cable and loud resonance from the pro chamber x-pipe when cruising.

 

N8Miller

I need NOS....make it 2 of the big ones

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Jul 26, 2000

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Aug 3, 2008

#6

• Aug 3, 2008

• #6

ok, i can tell you this.....

when you get them, get a 1 3/4 and a 3" collector. the collector is where most of the restiction is like on the BBKs (which fit really well!) and the MACs and Hookers have 3" collector that flows alot more!

 

5spd GT

"the 5.0 owns all"

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Aug 7, 2002

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Aug 4, 2008

#7

• Aug 4, 2008

• #7

BBK's have a 3" collector. They are about 7" long. The aforementioned ones are around 10" long.

 

N8Miller

I need NOS....make it 2 of the big ones

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Aug 4, 2008

#8

• Aug 4, 2008

• #8

5spd GT said:

BBK's have a 3" collector.

Click to expand...

wrong, they are 2.5" ball/socket!

 

EMW150

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May 22, 2000

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Aug 4, 2008

#9

• Aug 4, 2008

• #9

They are a little over 21/2" but with his heads they'll work fine.

 

N8Miller

I need NOS....make it 2 of the big ones

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#10

• Aug 4, 2008

• #10

EMW150 said:

They are a little over 21/2" but with his heads they'll work fine.

Click to expand...

they will work for now, and with his heads, but hes gonna need all the scavenging he can get when he does that blower!

 

EMW150

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May 22, 2000

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Aug 4, 2008

#11

• Aug 4, 2008

• #11

N8Miller said:

they will work for now, and with his heads, but hes gonna need all the scavenging he can get when he does that blower!

Click to expand...

You're right. I forgot about the future blower.

 

5spd GT

"the 5.0 owns all"

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Aug 5, 2008

#12

• Aug 5, 2008

• #12

N8Miller said:

wrong, they are 2.5" ball/socket!

Click to expand...

Wrong, they are 3.00".

The ball and socket joing area goes down to 2.37" for seal, but the collector is 3.00".