Our S52 engine long block service consists of a complete teardown, inspection and total overhaul of the engine.

Everything is washed in our high temp jet washer.

Head is then disassembled and inspected.
(Cams, cam trays, lifters, valves, valve guides, retainers, springs)

Block is disassembled and inspected.
(mains, oil squirters, head dowels, timing cover)

Crankshaft is washed, measured, polished, washed again and then final measured.

Connecting rods are a standard style cap, so they are able to be resized.

Aftermarket connecting rods will be an additional option

When everything is cleaned and thoroughly inspected, we can then proceed with how we want to go about your engine build. S52s are considerably a strange bore at (86.4mm). There are options for 86.5mm (JE) as well as 86.6mm MAHLE). Its fairly common for a S52 to be so worn you need to bypass 86.5 and go right to 86.6. Or go big right to 87mm.

When rebuilding a race engine you try and leave as many build cycles in it as possible. 87.25mm is about as far as we’d recommend taking an S52.

The block will be minimally surfaced (.004k is typically what we see an S52 needing, however different conditions and a harsher more abusive life could net more to be removed)

The block will be torque plate bored/honed (we use ARP head studs torqued to spec to emulate actual final assembly torque)

We will usually stock MAHLE 86.6mm (11.2:1) as part of our inventory. However if a custom set of high compression pistons is required, lead times can often be up to 3 months if not more.

If building a stroker engine we recommend the block is align honed to guarantee a perfect starting ground for our new crank.

The head is completely gone through including: valve guides, valve job, polishing cam shaft bores, surfacing the head, as well as optional porting for exhaust (recommended for supercharged, turbocharged, or high compression build).

Cutting seats for big valve heads is also an option, must be requested.
New +1mm valve will be ordered from Supertech + single groove keepers.

Choice of valve train is completely up to you. However with our builds, Supertech nitride exhaust valves are part of this rebuild package.

If budget is of no concern, we highly recommend a complete Supertech valve train, using their new beehive valve spring kits along with titanium retainers as well as nitride intake valves, and inconel exhaust valves.

As the machine work wraps up, we begin turning our sights towards the balancing of internal components. Checking the weights of the rods, pistons, and rings, against each other.

Bearings that we use will typically depend on availability. We use; King bearings, Calico coated bearings, as well as ACL and Clevite.

Assembly begins.

We use ARP fastener components in every place possible, main studs, rod bolts, and head studs. In a future rebuild these components can be reused. (Rod bolts will need stretch cycle management).

When reassembling the engines every component is replaced with a new one from timing chain, to guides, oil pan gasket, and plenty more.

WE ONLY REPLACE OIL PUMPS THAT ARE IN NEED OF REPLACEMENT
We tear down and inspect every oil pump, measure for clearances, check for unusual wear, as well as check wear on the aluminum arm that is known for chain interference leading to a hole, obviously leading to oil pressure issues. If a hole has started it can be tacked and then ground.

We have no problem replacing oil pumps, but as an additional charge.

Our Vanos units are rebuilt in house using Beisan Systems components.
WE NEED TO START WITH A GOOD UNIT, IF IT IS LEAKING OIL PLEASE DO NOT SEND IT TO US WITHOUT STATING THERE WAS A EXISTING PROBLEM WITH IT.

If your unit is leaking we have units available for purchase.

Final assembly is underway.

Your engine will be delivered timed and ready for accessories
(We can do complete accessory assemblies at additional cost, however accessories need to be supplied, and additional shipping costs apply for additional sizing of package).

Our lead times depend heavily on parts availability.

If all parts are in stock expect lead times of 2-4 weeks for basic S52 refreshes.

Before an engine is accepted a 50% deposit as well as a firm plan for build direction.

If direction of build changes from S52 basic overhaul to; stroker, high compression, super duper race build, lead times will increase to based on parts availability. Most parts are not on the shelf and are made to order. Subjects of cost will also change.

If you are interested in building an “extreme race” S52 please reach out to us and we will PLAN something in advanced so we can be more efficient, although if building an “extreme race” engine it may be a better idea to start with S54.