6024 - Signature Series Dirt Oval Mod Zenoah 4 Bolt 30.5cc Long Block

After quite a few years of prototyping our oval racing engines we've come up with the signature series dirt oval mod engine. The 30.5cc version is intended for the advanced oval racer and can be overpowered if you're new to racing. This engine is designed and tuned exclusively for oval racing and is not suited for bashing. It offers a great balance of torque and rpm's and is the fastest engine currently in the DLMRA series.   The following modifications have been done. Just like the rest of our engines this is cnc ported and comes standard with a billet crankcase. 1. Deck cylinder to raise compression without using a thinner cylinder gasket 2. Reshape piston 3. Lighten piston 4. Relieve piston to prevent seizes 5. Modify intake port for better flow 6. Adjust intake duration to our specs 7. Resurface all ports 8. Modify transfer ports for better flow 9. Enlarge and reshape exhaust port 10. Adjust exhaust duration to our specs 11. Remove stock crank and install stuffed crank 12. Install