Mopar Muscle Association UK

last night, I got asked the question how much power am I putting out? Good question, I have no idea. How much grunt should I be expecting (or not) from my engine? For a re-cap, its a 318 stroked by .010 via an offset grind, has 340 'J' heads with 2.02 intake and 1.60 exhaust (polished) valves, a Comp Cams 268H cam (Duration: 268/268 @ .050": 218/218 Valve Lift: .454/.454), 600 sec vac Holley on an Edelbrock performer intake, headers of unknown make (look the same as hookers) and electronic ignition.

Any one got any rough ball park figures I should expect to see? Next year I might get it on a rolling road to see what it actually does? is my little teen gonna do me proud?

If you post the intake and exhaust opening/closing points from the cam card I can plug the numbers into desktop dyno and give you a rough figure.

I don't think you have the duration @ 50thou right. That looks more of a "advertised" duration figure.

Your right Dave sorry, that is advertised duration. Actual duration @.50 is 218. This is the info on the stick that I have.

High Energy™ Cam
These high torque cams work very well on the street. Designed for use in carbureted engines having a 9:1 CR or less. Can be used in conjunction with most stock components, including intake and exhaust manifolds, and carburetors. Normally, gas mileage will either remain the same or increase over a stock cam


Camshaft Specification Table
Part Number 20-212-2
Engine 1964-2000 Chrysler
273ci-360ci
8cyl.
Grind Number CRS 268H-10
Description

--------------------------------------------------------------------------------

Intake Exhaust
Valve Adjustment 0 0
Gross Valve Lift 0.454 0.454
Duration At 0.006 Tappet Lift 268 268

--------------------------------------------------------------------------------

Valve Timing At 0.006
Open Close
Intake 28 60
Exhaust 68 20

--------------------------------------------------------------------------------

These Specs Are For The Cam Installed At 106 Intake CL
Intake Exhaust
Duration At 0.05 218 218
Lobe Lift 0.3026 0.3026
Lobe Separation 110

--------------------------------------------------------------------------------

Cheers

That is enough for a ballpark figure. That intake is a dual plane isn't it?

Yes mate, its an edelbrock street performer.

I will have a look at it tonight for you. But don't expect anything dramatic. It is quite a mild build.

lol, Cheers mate, I'm not really expecting anything mega as it was built for street use more than anything. I very nearly bought a .484 cam for it and a better intake but I drive this nearly every day so I had to behave with it. I need it to do more than 20 mpg.

How much cut on the heads? My guess is 190hp

Dunno mate, they were already on the car when i bought it and I've had .010 removed

Kev wrote:My guess is 190hp

Really? From what I have been reading the 1970 318 motor as standard with a 2bbl produced 230horses @ 4400 and 320lbs-ft of torque @ 2000. If this is right I would expect mine to be pushing 250-260hp?

I await correctment.

Kev wrote:How much cut on the heads? My guess is 190hp

Nah.........145-175

Yeah, although I'm not expecting much, it would be nice to see more than 145.

When you ask how much power are you putting out, you mean at the wheels ?

Kev is probably about right ... 180-190.

Plus, remember that the 1970 figures were gross, in other words, on a dyno with no exhaust system and minimal ancillaries.

Hence, your factory 230hp was probably actually 175-180, and by the time it got to the wheels, probably about 140.

Come on Dave, what do ya reccon he's makin' then?

Been waiting all night!

A mistake .........whop a 440 in