Speed-O-Motive's Customer SB Mopar 318cid 475HP!
Speed-O-Motive's Customer SB Mopar 318cid (475HP & 415FT/LBS TQ on 91
Octane Pump Gas) CNC machined LA style 318 block, all forged bottom end,
RHS/INDY LA-X Pro Action iron heads, Shaft Mounted 1.5 Ratio Rockers, COMP
Cams Custom Grind Solid Flat Tappet Cam, Edelbrock Performer RPM Air-Gap
71 Scamp ,650 Hp Small Block, 4 spd ,Test drive.
More power than you would ever need on the street, the shift light comes on
at 7000 rpm, 4:88 gears with a 30 x 11.5 M/T radial slick and it brakes
loose at the touch of the throttle. I don't even get it out of third gear.
Here is my Combo
71 Scamp Street /strip car,
4 spd 833 Trans Alum Case super pro shifted by Liberty
Clutch is by Advanced Clutches
2900 lbs me in car 4.88 gears 29.5 x 10.5 m/t slicks
Custom built tube front end, coil over, Rear is 3 link coil over
R3 block, 4.070 bore 416 CI
4" Scat light weight Pro Comp Crank
Scat H beam Rods with 2000 ARP bolts
Diamond pistons 11.30/1 W 65cc camber heads.
Solid roller, Bullet Cam, grind # CRA 298/307-08R
Part # 504000
T&D Rockers 1.65/1 makes about .700 lift
Indy heads #230-2 fully CNC ported and built by Shady dell speed shop Flow
325 @ 700 lift
Indy intake manifold #360-3 also ported and blended
860 Pro systems Carb built for my combo
Kevko racing oil pan
Engine Building Part 1: Blocks
This is the first in an engine building series that focuses on blocks. I
talk about general machining and options for rebuilding or starting a new
1973 Charger 318 390 Stroker on the dyno for a quick run
318 to 390 cubic Inch Stroker Specs:
ICON Forged Flattop pistons
Forged H beam Rods
Comp Cams Thumpr Cam
Heavily Ported 340 T/A Heads
1.5 Harland Sharp Offset roller rockers
Edelbrock Performer Airgap manifold
Holley 850 Avenger Carb
Headers with 3" Custom dual Exhaust
MSD DIstributor, Coil, and Ignition Box
TCI StreetFighter 904
8-1/4 LSD rear with 4.10 gears
The engine is running high 10's low 11's compression ratio and therfore
decided to run a blend of race fuel with an octane rating near 100. After
the Dyno run I
realized that the cam is doing nothing to help the engine make power and it
was evident in the numbers. Don't get me wrong it sounds great but its not
much in the power department, but thats the cams design I guess. The car
made 301 RWHP and 331 FT LBS of Torque.
We changed the carb to a 650 double pumper and were expecting better
results since the 850 is quite large for the engine but to no avail. The
carb change only produced 2 more rwhp and 1 more ft lbs of torque. Not
worth the expense of changing it especially for what ill be using it for.
I will be changing the manifold to a single plane and the cam will be
changed for something more aggresive like comp cams XR292HR-10. Hopefully
this will get a little more power out of the sucker.
Thanks for watching
Dyno pull of my 318 stroker (390) Dyno pull of my 318
with a 4" stroker kit, bringing the displacement to 390 cubic inches. It's
a very simple and mild street engine combo, consisting of 9.3:1
compression, a mild hydraulic cam, and bowl ported but otherwise stock iron
magnum truck heads. It made 367 HP @ 5,300 rpm, and 407 foot pounds of
torque @ 4,100 rpm. This engine is going in my 1989 Jeep Wrangler.
Special thanks to Performance Only in Delray Beach, FL for the excellent
machine work, building of the engine and tuning. Thanks to Eddie "Elvis"
Miller at The Engine Works for working the Dyno and providing tuning
World's First Blown 440 Small Block Mopar on E-85 and built by Muscle Motors (MI)
To my knowledge this is the world's first 671 supercharged 440 CI small
block Mopar that exceeded 1,000 HP with Edelbrock heads (ported and
polished) and "old school" custom Offy manifold. This was designed by me
but built by Muscle Motors in Michigan. The goal was 800 HP but the engine
Dyno'd at 1,020!!!!
This is going into my pro-street 1971 Dodge Demon. I have the Dyno sheet but Muscle motors
didn't show it on the video nor did they put in their name...need
marketing help in my opinion.