J & J Racing Engines

08/31/2026

08/28/2026

Have a set of Promaxx project x heads I was going to return as we meant to get the 235cc head, before I send them back I wanted to see if anyone was looking for a set. $2000 shipped to your door!

08/18/2026

Looking to get more out of your Gen V LT1 or LT4 cylinder heads? J&J Racing Engines offers complete cylinder head machining and performance upgrades from basic freshening to fully ported, race-ready packages.

Our LT1/LT4 services include:

• 5-axis CNC intake and exhaust porting
• CNC combustion-chamber work
• Precision Newen valve jobs
• Valve-guide inspection and machining
• Deck resurfacing
• Upgraded valves, springs, retainers and seals
• Complete cylinder-head assembly
• Flow-bench testing and verification
• Packages tailored for naturally aspirated, supercharged and boosted combinations

Whether you’re building a strong street combination or chasing serious horsepower at the track, we can put together an LT cylinder-head package around your exact engine and power goals.

Contact J&J Racing Engines for pricing and availability.

07/27/2026

Whipple-supercharged airboat engine in the shop for a freshen-up. While it was apart, we upgraded it to one of our new engine blocks that we’ve been testing extensively over the past several months.

The results are in, and the data speaks for itself. These new blocks have proven to be a significant improvement over the RHS blocks we previously used, offering better strength, durability, and reliability. We’re excited to get them out there and keep delivering the best possible products to our customers.

07/24/2026

4500 dominator Nitrous outlet stinger 3 kit, this plate speaks for itself! We have an extra one in stock $1050

07/23/2026

Cleaning up around the shop
-351 Windsor block bored and honed .040 $800
-used Moroso kickout steel pan pn 21050 $450
-brand new stefs aluminum gen 4 bbc with oil pump and fabbed pickup $600
-jomar stud girdle std spacing pn1113 $125
- dart 345 bbc heads fully ported (360) 118cc chamber, new ferrea valves, new Manley 221424p springs and retainers $3000

07/06/2026

250 years in America sale of American made parts.
Profiler 215 heads brand new setup for .650 hydraulic roller. 67cc chambers $2000 2 sets available