Mullins Race Engines USMTS/USRA Spec Engine

Mullins Race Engines USMTS/USRA Spec Engine


The MRE USMTS/USRA engine has been a serious competitor in this series for years. We have had multiple drivers pull off national championships. MRE has won the  “Engine Builder” points title for multiple years as well including 2023. We take great pride in this series and strive to have great packages for you to choose between.
We have two options available between the 415 and 374. This is a very popular question on which way we recommend for someone to go. My experience tells me if you’re mainly running big tracks or have more experience with the bigger cubic inch engines, stay with the 415. If you’re mainly running bull rings, the 374 is a good option. We have some teams with both and seem to switch back-n-forth. I honestly don’t think one is dominant over the other or there is a clear choice on which way to go. This comes down to driver feel and what they need out of the engine.

Start With Selecting your Cubic Inch Option

Product price: $19,391.47
Total options:
Order total:

Pay a deposit $2,000.00

$2,000 Deposit Required to begin production


$2000 Deposit Required to Start Engine Build

Remaining Balance Due Via ACH When Engine Build is Complete


USMTS/USRA Spec Engine Parts:
31161211 – Dart SHP Cast Iron Bare Block, 9.025″ Deck Height X 4.125″ Diameter Bore, 2-Piece Rear Main Seal, Small Block Chevy, Fully Machined
32000030 – SBC SHP Block Parts Kit – No Cam Bearings
DT-1T – Durabond Camshaft Bearing, Bi-Metal, Race Only, Dart Little M Block, Small Block Chevy, Set of 5
MS-909H-C – Main Bearings, H Series, 1/2 Groove, Standard Size, Tri Metal, Coated, Chevy, Small Block, Set of 5
CB-745HN – 2.000″ Journal Clevite Rod Bearing, H-Series, Standard Size, Tri Metal, Small Block Chevy, Set
CB-663HN – 2.100″ Journal Clevite Rod Bearing, H-Series, Standard Size, Tri Metal, Small Block Chevy, Set (415 Stage 2)
9-3100A – Cloyes Hex-A-Just Timing Set
9-221 – Cloyes Timing Cover, 2-Piece, Adjustable Cam Button, Aluminum, Natural, Small Block Chevy, Non-Factory Roller
ATI917781 – ATI Harmonic Balancer, Super Damper, Internal Balance, Steel, Black, Small Block Chevy
XTS16375 – Xceldyne SBC Timing Pointer Kit
MRE-23CGK – Mullins Race Engines 23 Degree Gasket Kit With Composite Head Gaskets
K016 – Point One Head Stud Kit
2251-0720 – T&D Machine Products Rocker Arm Shaft System – Brodix 23 Degree Spring Oil Hole
MRE-E2925S2CIPM – Mullins Race Engines Stage 2 Ported Edelbrock 2925 Intake Manifold, Super Victor 23 Degree, Single Plane, Aluminum, Natural, Square Bore, SBC
MRE-23DOECSK – Mullins Race Engine 23 Degree Open Engine With 2925 Edelbrock Intake Complete Bolt/Stud Kit
39-11901 – Quart – Maxima Break In Oil 15W50 – Per Quart X 10
1061 – NAPA Gold Oil Filter
NGK R5671A-9 – NGK Spark Plug, NGK Racing, 14 mm Thread, 0.749 in Reach, Gasket Seat, Stock Number 5238, Non-Resistor – Set
Fuel – Race Fuel to Dyno Engine
ALL10123 – Allstar Engine Lift Plate, 3/16 Inch Thick, Steel, Zinc Oxide, Spread/Square Bore Carb Flange
WS350KA – Dan Olson Racing Products Aluminum Wet Sump Oil Pan 7 1/8″ Deep
10555ST – Melling High Performance, High Volume, High Pressure, Billet Steel Oil Pump With Gasket
ARP230-7001 – ARP Oil Pump Fasteners, Standard Pump, Studs, Hex Head, Chromoly, Black Oxide
MOR23775 – Moroso Oil Filter Adapter, Bypass Eliminator, Billet Aluminum, Kit
MRE-ODBK – Mullins Race Engines Oil Drain Back Kit
SBC Chevy Valve Covers – Wet Sump – SBC Valve Covers – Wet Sump Includes Hardware and Sticker Kit
ALL90072 – Allstar Performance Oil Restrictors, .0850 Inch Orifice Size, 1/4 Inch NPT Thread
Head Options:
MRE-USMTS1 – USMTS Spec Head Stage 1
MRE-USMTS2 – USMTS Spec Head Stage 2
MRE-USMTS3 – USMTS Spec Head Stage 3
197836025 – Mahle SBC 1.250 Compression Height x 4.125 Bore 12cc Dome 112MM PP+ Piston Set (376 Cubic Inch)
197754735 – Mahle SBC 1.062 Compression Height x 4.135 Bore 9cc Dome 112MM PP+ Piston Set (415 Cubic Inch)
RC-SBC-1 – Roller Camshaft, Small Block Chevy, Standard Tunnel (376 Cubic Inch)
RC-50-1-903 – Roller Camshaft, Small Block Chevy, 50MM (376 Cubic Inch)
RC-SBC-5 – Roller Camshaft, Small Block Chevy, Standard Tunnel (415 Cubic Inch)
RC-50-2-903 – Roller Camshaft, Small Block Chevy, 50MM (415 Cubic Inch)
T790803 – Trend 7.900″ Length .080″ Wall 3/8 Diameter X 16 (STD Cam Tunnel)
T7901657 – Trend 7.900″ Length .165″ Wall 7/16 Diameter X 16 (50MM Cam Tunnel)
66200-16 – Crower Roller Lifters, Mechanical Roller, Vertical Link Bar (STD Cam Tunnel)
B-2004-16 – BAM SBC .904″ OD Needle Roller Lifters Offset B-2004 Series (50MM Cam Tunnel)
50MM Cam Tunnel Option:
TLA 5020 Z – IKO 50MM Needle Roller Cam Bearing Set
32540050 – Rear Cam Plug 50MM


Horsepower and Torque on Race Fuel:

374 Cubic Inch:


415 Cubic Inch:


Spark Plug Requirements:

NGK R5671A-9 gapped @ .035

Fuel Recommendation:

VP or Sunoco 112

Oil Recommendation:

Maxima 20/50 Semi-Synthetic – change oil every 5 nights

Oil Capacity:

Approximately  9 Quarts **No Oil Cooler**
Approximately 10 Quarts **With Oil Cooler**

Laps Before Freshening:

Normal Conditions 1500-1800 Laps

Lash Settings:

.016 – .016 hot or .012 – .012 cold
Set or Check Valves every 5-8 nights


31 degrees @ 5000 rpm

Additional information

Weight 450 lbs
Dimensions 48 × 40 × 24 in


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