Sticker Shock - The 392 Magnum Gets Ready for Auction - Engine Builder Magazine

Sticker Shock – The 392 Magnum Gets Ready for Auction

As you can see in the pictures, we’ve reached a point where we can say the engine is built and ready to install. Or in this case ready to dyno and auction off. We certainly would not have been able to produce such a cool piece without the help of our contributors and Grawmondbecks Competition Engines. The 392 V8 Magnum engine is currently being auctioned off on eBay Motors. The auction ends Dec. 21.

100_0313[1]We are coming down to the wire. The short block is built, heads ready to install and Christmas is right around the corner.

Truly, it already came for us when we got to open all the boxes that all our dress up parts and externals were shipped in, but I’m thinking of the day we open the real boxes and pull out all those goodies from ­Edelbrock, Milodon, ARP, DEI, ­Engine Pro, EngineQuest, Holley and Accel. These parts arrived months ago and have been patiently waiting to reveal themselves and ­announce, “We are there”.

Before we get to current, we need to look back at how and why we got here. If you haven’t figured it out by now, I’m a huge muscle car fan. I grew up with them, played and modified them and my personal toy is powered by an old school LS6 454.

But we put forth an idea that to keep business moving forward and with the availability of true muscle car engines diminishing, we should look at options that might make a less popular V8 bigger and badder than some of those factory muscle motors, and not break the bank in the process.

It looks like the supply of small block Chevrolets is not going to run out right away, but trying to find something different to do with one sounds impossible.

Your factory performance Mopars are getting scarce. We choose a very plentiful Chrysler V8 that can be found in all kinds of passenger cars and trucks, but is in reality the baby brother of one of the more collectable muscle engines. This is a good thing since it means many of the performance parts for the 340 will work with our 318.

The only thing left on our 318 is the block. With the theoretical money we saved by not having to buy a new high-demand core to rebuild, we decided to buy a stroker crank, a set of pistons that cost a bit more than the set we would have bought to rebuild the 340 to the level of performance we desired, and we also popped for a set of new head castings.

ARP came through with 4-main studs to mount the Milodon windage tray that we modified for clearance around the deep sump pickup.
ARP came through with 4-main studs to mount the Milodon windage tray that we modified for clearance around the deep sump pickup.

If you’ve built many sets of old heads, you know there is a trade off between the value of a new set of castings verses doing the guides, seats and milling them to get to, not only a smooth surface, but to also reduce the chamber size to establish the compression ratio you desire. And if the new castings flow better and will make better horsepower, well the decision just got easier.

With this in mind, it was a no-brainer to contact EngineQuest. They came through with a set of their new Magnum style heads. These heads are “Power improved” and will support the air-flow demands of a larger engine.

To get to that larger engine, the people at Scat came up with a 4-inch stroker crank and a set of their I-beam connecting rods.

Both cataloged for the 340, but an easy fit in our 318 block as well. Next we did a little flipping through the ICON piston catalog and were pleased to find pistons made for our combination and since they were not custom, but shelf stock, they wouldn’t break the bank for anyone wanting to build a similar project.

The people at United Engine, parent company for the ICON piston, sent us a set of its dished pistons at a .040” oversize. With the parts we’ve laid out we’ll have a 9.5:1 pump gas 392 cubic inch small block that should be able to yank the grin off the face of anyone doubting the power potential of a modified 318.

These are only a few of the components we’ve told you about over the past year as we’ve machined and assembled our version of the muscle motor Chrysler never built. Our crank spins on Clevite bearings, our Lunati cam rests on DuraBond cam bearings and oil is fed to the whole works from a Melling HV oil pump and driven by its shaft. The rings are from Engine Pro, as is the billet timing set. Fel Pro and Federal Mogul supplied the gaskets to seal things up and Melling also sent a brass plug kit to keep the water in. Milodon supplied the pan, pickup and windage tray, while Superformance brought the Viton rear seal. The DuraBond finish kit had parts we used throughout.

Comp Cams adjustable valve train. Engine Pro custom length pushrods.
Comp Cams adjustable valve train. Engine Pro custom length pushrods.

Moving up, we loaded our heads with Ferrea valves, Engine Pro springs and seals, Comp Cams retainers, rockers, studs and guide plates. ARP supplied the bolts to hold them down. The Lunati lifters connect to the rockers via a set of Engine Pro pushrods. Are you seeing dollar signs yet?

These are all the parts we used to build our long block, but the story doesn’t stop there. The “bling,” the “icing on our cake,” comes from several equally prestigious suppliers. Edelbrock helped us big time by supplying not only a carb and manifold, but also the valve covers, air cleaner, breather and a water pump. Our fuel system was completed with a Holley fuel pump and fuel filter. To spark things up ACCEL shipped in a complete electronic ignition system. Our plug wires and boots will be protected with shielding from DEI. Up front we’ll also use the timing cover shipped in from EngineQuest and Engine Pro came through again with a performance balancer.

Let us not forget Joe Degraw, Stacy Redmond and Steve Tosel from Grawmondbecks Competition Engines. Without these guys we would not have had a place to hang all these parts. Steve supplied our core 318 truck motor and did our head work. Stacy and Joe provided the space and did all the machine work and assembly. They’ll also dyno our finished engine.

Now when I said we started with a block and built from there, you can see I wasn’t exaggerating. Now we were very lucky to have such generous donations made to our build and such great support for our goal to raffle the finished project to raise some money for the Independence Fund (

Assembly Line

Our 392 Magnum is finished and on its way to this year’s PRI show.  The engine will be auctioned off on eBay Motors beginning Dec. 11.
Our 392 Magnum is finished and on its way to this year’s PRI show.
The engine will be auctioned off on eBay Motors beginning Dec. 11.

While assembling the external ­components for our Magnum, I had a chance to ask Joe about some ­statements I’d heard from shops across the nation. More then a ­statement, it seems a very common mindset.

For years, engine parts distributors looked to supply engine builders with everything they’d need to do a complete engine rebuild, including the related external parts such as water pumps, motor mounts and clutches. No matter how obvious a need for these parts seems, in the rebuilding arena, these do not seem to be big sellers.

More then one shop owner or manager has told me that they don’t even try to sell these parts anymore. The consensus is that there is a certain “sticker shock” for the consumer when the time comes to pickup their engine.

Though warned that there are parts that need to be replaced to honestly provide any kind of warranty, such as installing a new water pump, the memory of the consumer is only of the price quoted for the engine rebuild itself.

So when they show up and the bill is legitimately higher than the original quote because of the additions of items needed for a proper installation, the customer balks.

Repeatedly I’ve been told these stories, even heard that those additions are cancelled at the counter because the customer is not prepared to spend this new amount, leaving the machine shop holding special ordered products they may not be able to return.

Joe admitted that at one time this would describe their feeling as well. They did not push add-on parts that they knew would increase their profits, for fear of a confrontation over the final bill at the time the consumer comes to pay. Like most shops, they left these part sales for the auto parts store.

This is not so true today. Since the addition of the dynamometer, this has had to change. Any engine that they build that will see time on the dyno will need additional parts, period.

Note: For more on choosing a dyno/test stand for your shop, see Larry Carley’s article beginning on page 26 of this issue.

Some of these parts the customer may have or may wish to purchase themselves, but like the internal parts, they would rather make the sale.

MVC-729SOne very good trick he shared with me is to start a new ticket or work-order for the dyno session.

This way, the original bill is not affected by the additional parts. It is all easy to see right there in black and white.

I also noted in my time at their facility that they stocked quite a few parts that their customers can shop for at the time they pickup their job. Not the least of which includes oils and filters that their dyno customers will need, but often forget.

For years, I’ve suggested you must take a down payment before you start a big job or purchase many parts for a job, for your own financial security and protection. Having your customer vested in his or her own job also keeps them from having that “sticker shock” at the end of the job, and makes it easier for them to afford to bailout their job.

As you can see in the pictures, we’ve reached a point where we can say the engine is built and ready to install. Or in this case ready to dyno and auction off. We certainly would not have been able to produce such a cool piece without the help of our contributors and Grawmondbecks Competition Engines.

Note: The 392 V8 Magnum engine will be auctioned from eBay Motors beginning on Dec. 11 and ending Dec. 21

Check it out here

Before we could start bolting on all the products from Edelbrock, EngineQuest, Holley, Milodon and Engine Pro, we needed to bolt on the heads and valve train.

Our EQ heads are sealed to the block with head gaskets from Fel Pro and clamped with bolts from ARP. We showed you the adjustable rocker arm kit we are using from Comp Cams, but did have to turn to Engine Pro for an emergency shipment of custom length pushrods once Joe was able to use an adjustable one and check the geometry. We ended up with a length of 7.550” when used with our flat tappet lifters. The kit comes with short pushrods for use with a roller lifter cam.

I also previously reported we were having troubles with our main stud length. The people at ARP came up with 4-bulk studs that bailed us out. The stud length was not the only problem we were having with fitting our Milodon windage tray.

Once a position was established that cleared the stroker crank and rods, it interfered with the oil pickup. So Joe cut a slot in the tray that would allow the pickup to pass through. This is time-consuming work that adds to sticker shock. Many believe all these parts just fall together. Rarely is that the case.

The last small laborious job was adding some additional oil holes in our filter mount. Early plates had four holes, while later ones have six. Joe added four additional holes to our plate.

From here on it was pretty smooth assembly. Pan and timing cover fit well and were held down with ARP bolts. We turned the motor over and installed the Edelbrock goodies, including a new aluminum water pump.

100_0315[1]The valve covers and manifold were sealed with Fel-Pro performance gaskets, both metal reinforced. The intake gasket bolt holes needed to be opened a bit to align the gasket to the ports in the head, but it was minor. Baffles were assembled in the valve covers, as was the Edelbrock air cleaner. Edelbrock supplied a breather for one side and we installed a PCV valve in the other.

A Holley fuel pump is driven by the original factory eccentric and feeds fuel to one of its chrome fuel filters in route to our Edelbrock 800 cfm carburetor. Again, everything held together with ARP polished bolts. Finally we bolted on the Engine Pro street performance harmonic balancer and the front of the engine is done as far as we can go.

ACCEL came through with our electronic ignition system, including distributor, coil, wires and plugs. They even shipped a distributor hold down and the special wire crimping tools for the plug wires. ACCEL wires have a very nice ceramic boot at the plug. It seemed like a crime to cover them, but we also wanted you to see the DEI plug wire insulation and its “titanium” plug boot covers.

We don’t have headers, as we don’t know what vehicle the engine will finally be installed in, but the insulation will work well protecting our parts from the sprint car style headers we’ll use on the dyno. Doing the wiring was, by far, the most time consuming job of the day. You’ll also note the fabricated bracket to temporarily hold the coil.

If your job is as complex and potentially expensive as our engine build, you’ll certainly want a “downstroke,” or down payment at the time you start the job. I’d certainly recommend you get additional payments along the way. This will make the final payment one that doesn’t send your customer into shock and will also not hold them back from picking up their job and getting you paid.

Stay tuned for more information on our eBay Motors auction and the final article on 392 Magnum, which will run in the January issue.

You May Also Like

Shop Solutions January 2023

Next time you have set of large journal small block Chevy connecting rods to resize, consider honing the big ends of them for a +.002” outside diameter bearing that the LS engines with fracture cap rods use.

Engine and Machine Shop Tips and Tricks


For proper block cleaning, the oil bypass valves in Gen 5 and 6 big block Chevys need to be removed. We made a couple different sized “hook” tools for a slide hammer. This tool will easily pull the valves out of the block and sometimes without damaging them.

Top 10 Ken Block Gymkhana Films

Who doesn’t like a little bit of burnt rubber?

America’s Best Engine Shops 2022 | H&H Flatheads

Despite not being a fancy, state-of-the-art set up, Mike and his team at H&H have a great thing going. The equipment does exactly what it needs to, his team is experienced and the shop has built thousands of vintage engines for customers everywhere!

America’s Best Engine Shops 2022 | Choate Engineering Performance

This shop’s dedication to quality engine work, its growth, its machining capabilities and its impact in the diesel industry, all make Choate Engineering Performance well deserving of Engine Builder’s and Autolite’s 2022 America’s Best Diesel Engine Shop award.

America’s Best Engine Shops 2022 | 4 Piston Racing

The 4 Piston Racing facility in Danville, IN houses two buildings – one is 12,000 sq.-ft. and the other is 2,500 sq.-ft. The shop is very heavily focused on Honda cylinder heads and engine work to the tune of 300+ engines and 1,000 cylinder heads annually!

Other Posts

Intellectual Horsepower: All About Harmonic Dampers

Harmonic dampers are a component that seems simple on the outside, but there’s a lot more to dampers than you might think. Hear from the experts at Fluidampr.

Shop Solutions December 2022

Everyone misses occasionally, and this helps avoid dents and damage.

Jesel Certified Performance Rebuilds

Engine components are serious investments for any racer and maintaining that investment could be the difference between winning a championship and losing it.

Randy Bauer Shares His Experience as PERA President

We recently spoke to Randy about his PERA presidency and what some of the biggest hurdles are facing the engine remanufacturing industry right now.