[FOR SALE] 408 stroker

[krw340]

This motor was run in my 1977 Power Wagon one ton, long enough to break the camshaft in and was driven about 20 miles. I used Brad Penn 20W50 along with zinc additive during break-in. Had no problems on pump gas. Intentions were to build the motor for low end torque to use it for pulling a car hauler and plowing snow. I purchased another truck, so now the motor and Power Wagon are for sale. After pulling the motor I took it apart and installed new rod and main bearings that were measured for clearance, cleaned all parts, and assembled motor.

1978 360 block bored .030”, cylinders notched for rod clearance, and block was squared. I also installed the oil crossover tube for better oiling.
The heads have been ported nicely, which look to be done professionally to a stage 2 or 3 level. They have stainless valves, bronze guides, and heavy duty springs to match the Howard’s camshaft. .030” Cometic sheet metal re-usable head gaskets were installed. The roller rocker arms I’m not sure what brand they are but might be Pro-forms. I up-graded the adjuster screws to Crane Cams brand and cut the ball and cup push rods to length.
I port matched the intake manifold to the head intake ports and the exhaust side to a set of Flowtec headers.
The crankshaft (rotating assembly) was balanced and was told by the Machine shop owner it looked like a Scat (chamfered) cast crank. The piston domes were trimmed on the edge on the valve side to clear hitting the head.

The quench was measured to .036”. Rod and main bearing clearance was measured at .002-.003”. Valve lash was set at ¾ turn. Camshaft was installed straight up with a 3 way timing gear adjustment. The motor was primed and has 75 lbs. oil pressure with Valvoline ZR-1 10W30


Compression Calculator
Your Data Calculated Data

Cylinder Head Volume (cc) 62 Cylinder Head Vol (cubic in.) 3.782
Piston Head Volume (cc) 25 Piston Head Vol (cubic in.) 1.525
Gasket Thickness (in.) .030 Swept Volume (cubic in.) 50.769
Gasket Bore (in.) 4.2 T.D.C. Volume (cubic in.) 5.509
Cylinder Bore Diameter (in.) 4.02 Gasket Volume (cubic in.) 0.443

Deck Clearance (in.) -.019 Deck volume(cubic in.) -.0241
Note: Neg. nubmer above
deck, Pos. number below deck

Stroke (in.) 4 STATIC COMPRESSION RATIO 10.216

Rod Length (in.) 6.123 Adjusted Stroke (in.) 3.393

Intake Closing Point
(degrees) ABDC @ 0.050 lift
plus 15 degrees DYNAMIC EFFECTIVE
COMPRESSION RATIO 8.817

1978 360/408” Block
Bored .030” /Squared
Notched for rod clearance
Oil Crossover Tube Modification
New Freeze plug set

Rotating Assembly
Chamfered Crank Shaft
Rod rotating-513
Rod rotating-513
Rod bearing 46.5
Rod bearing-46.5
Oil allowance-6
Piston & Pin-591.5
Locks (1 set) X
Rings (1 set) 56.5
Rod reciprocating- 208
Bobweight total- 1981
Note: 50% Reciprocating, 100% Rotating
Keith Black Pistons KB356-030
Stock rods
ARP main bolts
ARP rod nuts and studs
Clevite rod bearings
King main bearings
Reproduction truck oil pan
Modified Dipstick Tube
Melling HV Oil Pump
Wix Oil Filter
Summit SFI harmonic balancer #A640195
587 Iron Heads Nicely Ported
Stainless Steel Valves
2.02 intake/1.66 exhaust
Bronze valve guides
Adjustable roller rocker arms (unknown brand)
Crane Cams rocker arm adjuster screws #crn-99802-16
Custom Made Ball & Cup Pushrods
Cometic Head gaskets #245-C5633-030
Howard’s Cam & lifters #CL710581-10
Hydraulic flat tappet 230/236, 277/283, .531”/.537”, 110+4 L/C
Double roller timing chain & gear set
Timing chain tensioner DCC-5007709
Stock Mopar Distributor
Standard Dist. Cap & Rotor Plug wires
Champion spark plugs RN12YC
Hardened Dist. Gear Drive DCC-3690715
Hardened fuel pump eccentric
Carter Fuel Pump #M6866
Mickey Thompson Valve covers
Edelbrock Performer 318/360 Intake Manifold
Hollley 670 Street Avenger Carb

Howard's computer dyno on this build with a 750 carb is 400 hp. @5000 rpm's & 475 @ torque 4000 rpm's.

Asking $4250 OBO

Located in Michigan 48661
Prefer to be picked up
You will have to pay shipping cost and make shipping arrangements.
I do make occasional trips to SW side of Mi. and can deliver or meet if paid in advance.

 

[T-N-T]

How much were the heads milled to get them down to 62cc's? Was the intake milled also?

It looks like the crank has been turned down .010 for the rods and .020 on the mains. Is that accurate?

 

[krw340]

The heads were already milled when I got it so I'm guessing close to .060" was taken off. And you are correct on the rods and mains.

 

[krw340]

Here is a picture of the crank with how much main & rod bearings were turned along with crossover tube and priming the engine. I did take measurements on the head and looked like it was real close to .060" .

 

[tnts72]

What is up with the bottoms of the combustion chambers on the heads?

 

[Jadaharabi]

You still got the truck for sale?

 

[krw340]

What is up with the bottoms of the combustion chambers on the heads?

They didn't exactly come from the factory flat from one side to the other. Some of them varied .040". So I machined them flat and a little deeper so the domes would not hit, also due to the fact that the heads have been milled .060" or so which I've already mentioned. The piston domes were trimmed on the edge on the valve side to clear hitting the head. Does it make sense to you now ? The domes were above the deck .075" if I remember right, and if .060" was taken off the heads, it's going to be a tight fit ! I don't know how else to explain it. I also polished them and that's why they look so shiny. Hope this helped answer your question.

 

[krw340]

You still got the truck for sale?

Yes it's still for sale. Send me a pm with your email address and I'll send you some pictures if you are interested.