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[BigLew]

Hey guys what would be the correct TB size for a crate 124 S&S HC 640 cam?

BigLew

[Unbalanced]

Hi Mike

HPI - maxflow 62-64   Then choose appropriate intake port size guessing 1.8

HPI- 62FBW-18.  Last 2 number change based on intake port

The 62/64 will give you better low speed drive ability with the 6.22 injectors

https://docs.wixstatic.com/ugd/a22407_e2fe76bcd478403aad33afa257cf2c8e.pdf

[BigLew]

pulled the blower and was looking at the TB after we put the 6.3 injectors in. The part number is a stock 50mm TB. Looks like its bored out to a 58 at the outside opening. Man that really sounds like a small TB. Not sure how well this will run once we tune it. What do you think?

BigLew

[Unbalanced]

Mike,

Cant speak to quality or flow of the throttlebody you have,   In my opinion though the manifold is too small, will keep velocity but is the limiting factory.   The HPI has a much larger manifold and flow should/ and most likely will be improved.   Worst thing you do is use your 58 and try the other later and compare.   If the money isnt the issue if it were mine i would go larger.   

Use a snap gauge to tell you at the butterfly what the sizing is.

[TorqueInc]

Stock HC s&s 124?

58 t hog is plenty

[BigLew]

I'm thinking with Harry that it needs a 62

BigLew