Siebert Performance

03/25/2026

🔥A little flat tappet cam break-in on a 402 BBC Stock Eliminator engine this morning 🔥

👉 www.siebertperformance.com

03/18/2026

The Reality of Engine Building in 2026

One thing people don’t always see behind the scenes in an engine shop is how often brand-new parts show up with issues.

Here’s a good example from today.

These are two pistons from the same brand-new shelf set, and same batch number. Same wrist pin… two different results and neither are right.

• One piston – the wire locks install but clamp the pin so tight it can’t rotate
• The other piston – the wire locks won’t even fit because the groove is machined in the wrong location

This kind of thing has been happening more and more often lately, and it seems like every other project we work on has something that needs corrected or replaced.

Unfortunately, tracking down and fixing problems like this takes valuable time, but it’s part of doing the job right. If we don’t catch it here, it becomes someone else’s engine failure later.

👉 www.siebertperformance.com

03/12/2026

Little timelapse from the mill today installing down-leg boosters in one of our Pro Series Billet 4150 carburetors.

Choosing the right booster for the application is a huge part of getting the carb to behave the way the engine wants it to. 👌🏻

👉 www.siebertperformance.com

03/10/2026

We originally built this carburetor in 2024 and it’s back in for an off-season refresh.

A little ultrasonic bath to get the passages cleaned out, wash off seasons of dirty fuel residue, dirt, and grime… it’s basically a hot tub for carburetors. 🛁

Check out our site to see what we can do for your race program
👉 www.siebertperformance.com

03/03/2026

We cut the front off a brand new intake with a Sawzall this morning. 😳

Then stuck it in the mill and started machining the ends of the plenum out of it. 😳😳

Shiny aluminum paperweight or something cool? 👀

Drop your guesses below ⬇️

👉 www.siebertperformance.com

02/27/2026

🚨 Carb Tech Talk 🚨

What do YOU want to learn about carburetors?

We’re lining up new videos and tech posts and want your input. Drop your questions in the comments ⬇️

We want to build content around what helps you most. 👍🏻

👉 www.siebertperformance.com

02/25/2026

🔥Check out this 632 BBC we wrapped up on the dyno last night. This one made 1,200+ horsepower naturally aspirated.🔥

We tested two different carburetors, did some tuning, and worked through the combination to get it where we wanted it.

What would you put it in — dragster, door car, or something else? 🏁

Check out the engines, parts, and services we offer at 👉 www.siebertperformance.com

Moroso Performance Products, Inc.
Total Seal Piston Rings
Bullet Racing Cams
Callies Performance Products
Wiseco Automotive

01/27/2026

✨Two Sportsman Series billet carburetors going together — one 1000 CFM and one 750 CFM.
Both are getting ready for booster installation.✨

Check out 👉 www.siebertperformance.com to see our full lineup of 4150 and 4500 carburetors for gas and methanol, plus carburetor accessories like spacers, Track-Pack gasket kits, and billet fuel logs.

01/15/2026

🔥 685ci Big Block Chevy on the dyno 🔥

We spent last night doing baseline testing on a customer’s used 685ci Big Block Chevy nitrous engine. The goal was to find what the engine actually likes and verify what the customer has been racing with.

Through testing, we were able to dial in the timing the engine responds best to and confirm the power level it’s been making, removing any guesswork moving forward.

👉 siebertperformance.com

01/14/2026

Every log tells a story if you know how to read it.

🔴 Pink – Engine RPM
🔵 Blue – Acceleration G-forces
🟠 Orange – Fuel pressure

This graph is from an NHRA Super Gas throttle stop car.

Notice how fuel pressure climbs nearly 3 psi on the launch, following the G-forces, not RPM. That’s a subtle detail — but it can create real tuning and consistency issues.

👉 Something as simple as fuel pressure regulator placement can cause fuel pressure to change in relation to G-forces.
👉 Many issues like this get mistaken for carburetor problems, when the real cause is in the fuel system.

This is exactly the kind of insight our data acquisition analysis services are designed to uncover — so changes are made for the right reason.

Learn more about the drag racing data analysis services we offer 👉 Siebertperformance.com/collections/racing-services

12/30/2025

This is the kinda of news that gets you excited!

FOR IMMEDIATE RELEASE

IHRA Acquires Heartland Motorsports Park, Announces Vision to Restore Iconic Facility as a Destination Entertainment and Racing Complex

Fairfield, Ohio — The International Hot Rod Association (IHRA) today announced the acquisition of Heartland Motorsports Park in Topeka, Kansas, reinforcing IHRA’s long-term commitment to preserving motorsports history while reimagining legendary venues for the future.

https://ihra.com/ihra-acquires-heartland-motorsports-park