ACE STREET – Gen III HEMI CGI Engine Block | 4.090" Standard Deck, Factory VCT

The drop-in CGI upgrade. ACE STREET is the block for a Gen III HEMI build that keeps the factory valvetrain exactly as it sits. Standard 9.285" deck, stock lifters, factory variable cam timing and your stock cam — nothing else in the engine has to change. You get compacted graphite iron strength without a parts list of supporting modifications.

This build

• Deck height & lifters: Standard 9.285" deck, stock lifters
• Timing drive & cam: VCT (variable cam timing) with stock cam
• Bore & finish: 4.090", rough
• Price: $4,200 — direct from the manufacturer

Fitment

Fits Gen III HEMI 5.7L and 6.1L. A true drop-in: it keeps your factory VCT, stock cam, and stock lifters, so your existing timing control and valvetrain carry straight over.

Machine work required

Rough bore. This block ships .003" undersize at 4.090". Your machine shop finish-hones it to final bore before ring fit — standard practice on any fresh build, and it lets your shop match the hone to your ring package.

Supporting parts

None required beyond your normal rebuild parts. Standard deck height means standard-length intake, pushrods, and front drive. VCT is retained, so factory timing electronics work as-is.

ACE CGI engineering — on every block

• Compacted graphite iron, 450 MPa minimum tensile strength (GJV-450)
• 6-bolt 4140 billet steel main caps on all five mains
• M14 head stud threads in the deck; 9.5" studs for roughly 50% more stretch compliance, so clamp load stays stable through a knock event
• True priority main oil gallery, dedicated lifter secondary circuit, and a straight filter-to-MOG feed with no 90° turns
• Dry sump feed provision; cast-in -8 ORB oil drain-back ports at the pan rail by cylinders 1 and 2
• Fully water jacketed — race block strength, street driveable
• 100% stock mount compatibility, including TRX engine mounts and SUV front differential mounts
• Serialized casting, shipped with its CMM report and full casting and machining QC documentation
• Cast and machined in-house at our Michigan foundry and CNC cell

Ordering

PRE-ORDER — reserve your block now. Orders are fulfilled in the sequence received, and we confirm your production slot by email once your order is placed.

Full payment at checkout. Direct from the manufacturer — same price for everyone, no dealer markup, no middlemen. Free shipping within the USA.

Not sure it fits your build? Talk to an ACE engineer before you order: eric@aceinc.shop · (615) 924-2737. We would rather spend ten minutes on your combination than have you order the wrong deck height.

Need a different bore, deck, or cam setup?

ACE STREET is one fixed configuration. Every other combination — tall deck, splay roller lifters, non-VCT front drives, larger bores, factory-honed finishes — is available on our Build Your Own Gen III HEMI CGI Block page.