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Bore throttle bodies or not

Printed From: Brock's Performance
Category: Technical Articles and Information
Forum Name: Product Discussions (Customers Welcome to add a Topic)
Forum Description: An area to discuss particular products, dyno results, our combinations etc. in detail.
URL: https://forums.brocksperformance.com/forum_posts.asp?TID=2611
Printed Date: October/05/2026 at 1:48pm
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Topic: Bore throttle bodies or not

Posted By: Frederick
Subject: Bore throttle bodies or not
Date Posted: October/08/2019 at 9:55am

I was reading good things about bored throttle bodies. I am thinking to bore my 44 throttles to 47. Do you have any experience/records on throttle mods? Performance gains, ET gains, etc.

Bored throttles will give me a better air flow, but air velocity will suffer...how important is velocity vs flow?

Replies:

Posted By: Brock
Date Posted: October/08/2019 at 11:05am

Frederick,

The gains are really dependent upon the engine. For example, 47mm TB's on a stock-2-brock configuration RWHP... the same TB's on a big motor were worth around 7 RWHP.

Hope this helps,

Brock