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Yesterday, under a different topic heading, I complained that I had purchased a set of pedals from a vendor and they had arrived in a box with another vendor's branded packing tape on the box. That triggered my taking a look at the other vendor's website and discovering the same product I had purchased at considerably less than I had paid the original vendor.

As I stated, my fault! I didn't shop hard enough for the best price.

Well, the vendor from whom I purchased the pedals obviously saw my post because, last night, I received an e-mail indicating a refund equivalent to the difference in price between what I paid and what the other vendor had the pedals priced at.

There was a simple message in the e-mail: "We want to keep you as a customer".

Well, Vintage Motorcars, owned and operated by Greg Leach, thank you for that gesture of outstanding customer service, you've got me. You are the first place I will check for anything I need in the future.

 

Bob

   

       

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Greg- 1 3/8" tubing works well for a street engine that size. 1 1/2" may give a little more at the very top end, but then you don't have as much torque down through low end/lower midrange (where most drivers spend most of their time) and the mileage won't be quite what it should.

header size chart

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Last edited by ALB
WOLFGANG posted:

THXs. That' a great chart to have saved in SOC reference library !  I'm running stock heater boxes now but not really needed in NW FL. I would have gone with the 1 1/2" but my engine will never see 7500 RPMs - at least NOT more than once.

Greg, that's funny...You said "I'm running stock heater boxes now"

When did you get your car finished and running?

art posted:

Al,

What is meant by "primary" outside diameter?  Also isn't the ID more important than OD?   And where on my pipes do I measure?

Thanks,

Art

The exhaust "primary" pipe is the pipe that is coming directly off the exhaust port in the head. If the primary pipes are merged together, that single pipe leaving the merge is called the "secondary" pipe. Primary pipes have a smaller diameter than secondary pipes.

For airflow, yes it is the ID that matters, but unless you go crazy and try to use thickwall tubing in your exhaust, you'd be hard pressed to tell the difference in ID due to typical exhaust tubing wall thickness even on a dyno. All tubing is measured by OD, that's why it's listed that way in those charts.

Measure your OD with calipers on any straight section of pipe. Don't measure on a bend as the metal could be stretched, shrunk, or ovaled and would ruin the measurement.

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