WE CAN DO ALL ENGINE BUILDS

We Have Subaru Blocks In Stock!

Is your engine knocking, consuming oil, or have a broken ring land? Are you looking to build your engine to handle power? Here at JM Auto we can help you. We have several blueprint assembled choices to get your Subaru back on the road and running strong again. Worried about how much time it will take to get your engine rebuilt? Don’t worry, we have blocks in stock for the quickest engine rebuilds in town!

JMA Stage OEM

Our first choice, which is the most inexpensive, is a new OEM short block. We take your engine apart and have the heads completely rebuilt (valves and seats ground, heads resurfaced, new valve seals, guides inspected/replaced, and valve lashed. Then transfer all the other components over to the new short block. We reassemble the engine using all OEM gaskets and seals. This option is mostly recommended for non turbo engines. We will do this option on turbo engines but will have to be 100% stock.

JMA Stage 1 – Rated up to 450 WHP

JMA Stage 1 is rebuilding a used block. We tear it all the way down to just the case halves. Send the case halves out to be torque plate bored and honed. Rebuild the heads back to OEM spec and assemble using OEM gaskets and seals. This option comes with Manley forged pistons (or JE Pistons for hybrid builds). With this option we also use good, OEM spec, lightly used rods and a polished OEM spec crankshaft. Lastly, we get rid of the horrible factory bearings and clearances and install King Racing bearings. This is our most common choice for our customers since it is the most affordable and exceeds most customer’s power goals. We take your block as a core for this option to prepare for the next customer.

JMA Stage 2 – Rated up to 550 WHP

JMA Stage 2 is rebuilding a used block. We tear it all the way down to just the case halves. Send the case halves out to be torque plate bored and honed. Rebuild the heads back to OEM spec and assemble using OEM gaskets and seals. This option comes with Manley forged pistons (or JE Pistons for hybrid builds). With this option we also use a brand new “430” OEM Subaru nitrided crankshaft. For the additional HP rating, this option comes with Brian Crower connecting rods that are rated for 700 HP. Lastly, we get rid of the horrible factory bearings and clearances and install King Racing bearings. We take your block as a core for this option to prepare for the next customer.

JMA Stage 3 – Rated up to 600 WHP

JMA Stage 3 is the second strongest. Rebuild the heads to OEM spec and assemble using OEM gaskets and seals. We use brand new OEM case halves with the OEM bore of 99.5mm. We use Manley “drop-in” forged pistons matched to either “A” or “B” bore. Then we install a brand new “430” OEM Subaru nitrated crankshaft. This option again comes with Brian Crower connecting rods that are rated for 700 HP. Lastly, we get rid of the horrible factory bearings and clearances and install King Racing bearings. We do not require your block as a core for this option.

JMA Stage 4

JMA Stage 4 is the strongest and most custom. We go all out at this stage and use a IAG closed deck block. IAG torque plate bore and hones brand new case halves with their closed deck technology to 99.75mm. Then we install piston, rods and bearings of your choosing (with our advice based on your power goals). We use a brand new “430” OEM Subaru nitrided crankshaft that has been proven good to 1000 HP. Have your heads rebuilt and re-assembled using OEM gaskets and seals with the option of fire ring head gaskets. With this option we can also get 14mm head studs, pinned mains, ARP case bolts with line honed mains, O-rings or other options for superior strength based on your power goals.

All of our builds include a Killer B oil pickup, ARP head studs, STI 11mm or JDM 12mm oil pumps. Brand new oil cooler, oil pans and oil pumps are required if we find any signs that metal has gone through the engine.

We can also customize your engine by adding parts like head studs, upgraded valves, valve springs, retainers, cams, either 2.1, 2.35, 2.6, 2.7 stroker, and a 2.5 hybrid if desired. If you’re looking for more than just a rebuild we also do things like turbo upgrades and offer full in house tuning to get all of your new parts operating at peak performance.

All builds are blue printed by us so all clearances are with in spec to help enable your build to last as long as possible. All of our machine work is done by the best machinist in the business.

All of our engine builds also include us doing most of the break in for you. We always blue print all of our assemblies. Prior to initial start up we pressure tank the engine, do a boost leak test, and coolant pressure test. Our tuner also makes a base map personalized to your vehicle. We break in the cams and bearings right away then the piston rings on the dyno immediately after before any street miles. We put roughly 100 miles on the car and tune it prior to giving the vehicle back so it is basically turn key and ready to go. This is why we have built so many successful high power motors. All new parts and labor purchased through us come with a warranty!