Guess My Power Numbers

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MOPARJ

MOPARJ

What can I upgrade now?
Joined
Nov 3, 2006
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Location
Thousand Oaks, Ca
I have a 73 318 with reworked stock open chamber heads, Comp XE268 cam, Hooker super comp headers, flowmaster 40 exhaust with H pipe through 2.5" piping, holley 4160 600 cfm carb with 70 primary jets and the stock secodary plate, Edelbrock performer intake, MSD coil, orange box, and MP distributor with quicker adavance setting.

The rear is a 3.21 geared 8 1/4 and the trans is a 904 for Trans Go TF2 kit and Hughes 2500 stall.

This is what is in my Duster. It seems to do well and runs great. Its a little soft on torque until I reach about 3000 rpm, then it takes off. I have put 17000 miles on the motor since I rebuilt it in July 07.

What do you guys think for power? 280-290 horsepower?
 
CamQuest says about 340HP at the crank.
 
Any 1/4 mile times with MPH? I would say you're probably closer to your guess...290-300 hp. The Camquest software can be somewhat accurate if you feed it ALL the correct info (head flow #'s and such)...otherwise it is a little too optimistic, JMHO.
 
Yep, I agree with flyfish. Probably not more than about 290, which ain't too shabby!
 
14.7-15.0 currently. More gear and a more aggressive carb setup may help more.

I should mention that is has cast TRW 8.5:1 pistons, with moly rings.
 
flyfish said:
Any 1/4 mile times with MPH? I would say you're probably closer to your guess...290-300 hp. The Camquest software can be somewhat accurate if you feed it ALL the correct info (head flow #'s and such)...otherwise it is a little too optimistic, JMHO.
Click to expand...

I agree it can be optimistic. Still fun to play with, though!

MOPARJ said:
14.7-15.0 currently. More gear and a more aggressive carb setup may help more.

I should mention that is has cast TRW 8.5:1 pistons, with moly rings.
Click to expand...

I used 9:1 and 1.9 intake/1.6 exhaust with pocket porting, of the stock low-perf head.
 
xring said:
I agree it can be optimistic. Still fun to play with, though!



I used 9:1 and 1.9 intake/1.6 exhaust with pocket porting, of the stock low-perf head.
Click to expand...

It has a 3 angle job on the heads with 1.78 intake, and 1.50 exhaust and 8.5:1 pistons, so that will most likely lower the number to 280-300 on the program.
 
CamQuest is also very sensitve to intake manifold type. If you know the 1/4 mile ET, MPH, and car weight (with driver), you can calculate rear wheel HP pretty well with some of the online calculators.
 
300 at the crank if you a lucky.

More likely in the 270-285 range
 
Yeah, it feels 275-285 ish. 5.0 Mustangs and earlier 4.6L Mod motor Mustangs are not much of a problem on the street or the track.
 
My buddy is running that same cam in his '70 dart with "smog" 318 with 1.88/1.60 "j" heads,weiand dual-plane intake,edelbrock 600 stock settings,headers,904 stock converter and 3.91's he's gone a best 13.75 with it,not bad considering whats in it..
 
stroked 340 said:
My buddy is running that same cam in his '70 dart with "smog" 318 with 1.88/1.60 "j" heads,weiand dual-plane intake,edelbrock 600 stock settings,headers,904 stock converter and 3.91's he's gone a best 13.75 with it,not bad considering whats in it..
Click to expand...

Yeah, I also run a 340 and 383 in two other cars of mine, but this 318 Duster is more or less a cruiser with some pep. Without some more compression, its not the quickest thing on the street, but I am doing my best to get all I can out of this setup, or add more to it. Its pretty strong at the moment. The 3.21 gears hurt a bit out of the hole, but pull hard at 65+ mph.
 
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