IMCA Northern/Southern SportMod | USRA B-Mod

imca sportmodWith the rules change in 2012, we had to make some updates to our existing engine package. We really like the new changes that IMCA has incorporated. This will make these engines more durable without much added cost to the overall package. With the way the rules are written these engines will be very close in power from all builders (if motor is truly legal). There are a few advantages that MRE has to offer that separates our SportMod engine from the competition. The quality of machining we offer is second to none!!!

We start with a brand new GM block and completely CNC machine it. This allows us to get the decks and bores of the block in the exact locations to create a higher quality built engine and MAKE MORE POWER. We valve job the cylinder heads in a NEWEN CNC machine. This machine is only found in high-end Sprint Cup and IndyCar race engine shops. This allows us to put the highest level of performance valve job in the heads and keep it LEGAL. Our valve train knowledge from building OPEN and USMTS Modified engines that turn RPM levels well beyond 9,000 has been applied to this application. We realize these engines will not be turning RPM levels like this but the knowledge we have gained from the years of this have went into camshaft design and other valve train components to make the engine RPM better and the end result will create faster acceleration while being more durable.

We are in the process of making a video of a SportMod engine build from start to finish. This will allow you to see all the machining, assembly, and some pulls on the dyno. This will let you know how serious we're taking this program. I will list the parts used below. NOTICE we don't use any Chinese parts in the engine (WE LIKE TO USE HIGH QUALITY PARTS IN ALL OF OUR ENGINES PLUS I SUPPORT THE AMERICAN ECONOMY TO KEEP AMERICAN PEOPLE WORKING!) We build this engine with the mentality of building one for ourselves and we use as many AMERICAN made parts that the rules will allow.

Parts List

  • NEW GM BLOCK (FULLY CNC MACHINED BY MRE)
  • IMCA LEGAL CRANK AND RODS
  • MRE CUSTOM PISTONS
  • CLEVITE BEARINGS
  • MRE DESIGNED CAMSHAFT
  • COMP MAGNUM PUSHRODS
  • COMP ROLLER TIP ROCKERS
  • NEW EQ HEADS FULLY MACHINED BY MRE
  • FERREA HOLLOW STEM VALVES
  • MRE CUSTOM VALVE SPRING (HUGE ADVANTAGE)
  • COMP LIGHTWEIGHT TOOL-STEEL RETAINERS
  • XCLEDYNE FULLY MACHINED LOCKS
  • ARP SCREW-IN STUDS
  • COMP GUIDE PLATES
  • CHAMP CP 100 OIL PAN WITH INSPECTION HOLE
  • MRE CUSTOM OIL PUMP
  • CLOYES HEXADJUST TIMING SET (LITTLE OVERKILL FOR A SPORTMOD BUT A HIGH QUALITY PART WE CAN'T DO WITHOUT!)
  • ARP HEAD BOLT KIT
  • POWER BOND PB1012-SS BALANCER
  • EDELBROCK INTAKE
  • MULLINS LOGOED ALUM VALVE COVERS

COMPLETE ENGINE

4340 crank upgrade $500
valve cover - pivot ball oiling system upgrade $400 (only legal for IMCA Southern)
$8,750

FULLY MACHINED ENGINE, READY FOR ASSEMBLY

$7,500

BALANCED ROTATING ASSEMBLY

4340 crank upgrade $500
$1,295

BRAND NEW GM BLOCK FULLY CNC RACE PREPPED

includes cam bearings and freeze plugs
$1,350

OIL SYSTEM

includes oil pan, oil pump, pickup screen on pump, oil pump stud, and pan gasket
$455

When the rules will not allow full roller rockers and you’re limited to a roller tip only style rocker, it presents many issues with damaging the rockers or causing excessive heat to where it blues and galls the rocker arms to the point of failure. When the rocker is in this state, the engine is losing power from friction by 7-15 HP, let alone getting ready to fail. We have found remedies to this and thought we would offer it to racers who build or work on their own engines.

tig-welded-rocker-tnWe soon realized you have to flood the rocker with oil. One way of doing this is TIG welding a shield on top of the rocker to keep the oil from flying out away from the rocker. This covers the oil hole and deflects the oil back to the pivot ball area helping with lubricating it and also keeping it cool. We do this for all roller tip rocker engines we build here, including the Southern Series SportMod where we run oilers in the valve covers as well. When only doing the deflector on the rocker (USRA B-Mod and Northern SportMod), we run a lighter valve spring than when we do on the valve cover option. When building the Southern SportMod engine we add the valve cover oiler option as well which allows us to run a more aggressive valve spring. Both valve springs are high quality and cost the same but one has more spring pressure than the other.

valve-cover-kit valve-cover-work-done valve-cover-kit-installed
Valve Cover Kit Work Done to Valve Cover Valve Cover Kit Installed

MRE valve springs for USRA and Northern SportMod

lighter spring for rocker deflectors only
$250

MRE valve springs for Southern SportMod

heavier spring for rocker deflectors and valve cover oilers for pivot balls
$250

Add deflectors to comp roller tip rockers

$125

Complete pivot ball oiling valve cover kit

Comes with all the lines and fittings needed and custom made valve covers to spray oil on the pivot balls. The valve covers come with an oil fill but we do not install any type of breather in the valve covers themselves (too much oil and will leak). We run the breather in the intake.
$495
fitting-welded-intake-tnWe can also provide you with an intake and the breather installed. This is a $75 option added to our intake price, which makes for a clean engine.