Feel like my 440 should be faster

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standup303

standup303

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Just did a 360la to 440 swap and honestly thought the 440 was going to be quicker.

Had to cancel my dyno tune appointment tomorrow due to snow. Was wondering if you all see anything that stands out as a weak spot in the build that could be hindering power?

Running 19 initial, 37 total, vac advance, have the curve setup how I want it.

Haven’t touched the carb, Quick fuel said go down 1 jet size (I believe) for every 1,000’ of altitude and I’m at 5,400’ but the plugs look good to me, medium tan color

Everything is brand new:

9.38.1 compression (calculated)
Bored .030 over with Speed Pro forged pistons and moly rings
Completely balanced
Cam and crank tunnels align honed
452 heads stock unported with Howard’s springs specs for the cam
New cam bearings
Howard’s Roller .530 lift, 235/243 dur, 103 CL
Howard’s roller lifters
440 Source roller rockers
Custom Smith Bros push rods
Aluminum 440 source water pump housing and pump
Carter street super m6903 fuel pump
Melling standard oil pump
Edelbrock Performer RPM intake
Quick Fuel Slayer 750cfm carb, vac secondaries, 1” spacer
Lokar stainless braided throttle cable
K&N air cleaner
CVF serpentine system
Stock ignition box and ballast
MSD coil
MSD spark plug wires
Schumacher Tri Y headers
Schumacher engine mounts
Pypes 2.5” stainless exhaust with Street Pro mufflers
Hughes 2500 stall converter
3.23 gears
727 reverse manual valve body
 
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Do you know the piston/cylinder wall clearance?
Was the cam degreed in?
Why do you have 3.23 gears with that cam?
How tall are the rear tires?
Car weight going down the road?
What cylinder heads?
What rpm do you run it up to?
 
Is a 2500 stall correct for your cam, gearing, tire size, and weight?
Also, you may want to calculate the exhaust diameter needed for what you have. I calculated out 2.5" is best for scavenging for my 360 with my promaxx cnc 185 heads, Doug's headers and h pipe.
What do your heads flow? I did not see you mention heads. That's kinda critical.
 
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my opinion I don't like the cam and rear end gear ratio mix. Put a set of 391s in the butt and release the beast.. it'll be a whole different ball game.
 
Read the list twice and didn't see what heads. I'd run a double pumper. Is this "feeling" off the seat of your pants test drive? No way for us to know if it's in the ballpark or not without knowing something about how you determine slow.
 
318willrun said:
Read the list twice and didn't see what heads. I'd run a double pumper. Is this "feeling" off the seat of your pants test drive? No way for us to know if it's in the ballpark or not without knowing something about how you determine slow.
Click to expand...
Same. I thought it was because I was just retarded and had to re-read it twice.

Fortunately, I realized I am just tired, not 'tarded.
 
413 said:
Do you know the piston/cylinder wall clearance?
Was the cam degreed in?
Why do you have 3.23 gears with that cam?
How tall are the rear tires?
Car weight going down the road?
What cylinder heads?
What rpm do you run it up to?
Click to expand...
Do not know the piston/cylinder wall clearance but I want to say my ring gap was .020-.023ish. It was on the wide end of the spec I remember that.
3.23 came with the car, I would like to get into some 3.73 or 3.91
27.05 rear tire height
Not sure on weight
So far I’ve taken it up to about 5500 with only 300 miles being on the build
 
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standup303 said:
Do not know the piston/cylinder wall clearance but I want to say my ring gap was .020-.023ish. It was on the wide end of the spec I remember that.
3.23 cam with the car, I would like to get into some 3.73 or 3.91
27.05 rear tire height
Not sure on weight
So far I’ve taken it up to about 5500 with only 300 miles being on the build
Click to expand...
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Ottmundr said:
Is a 2500 stall correct for your cam, gearing, tire size, and weight?
Also, you may want to calculate the exhaust diameter needed for what you have. I calculated out 2.5" is best for scavenging for my 360 with my promaxx cnc 185 heads, Doug's headers and h pipe.
What do your heads flow? I did not see you mention heads. That's kinda critical.
Click to expand...
A 2500 is whats recommended by Howard’s for this cam. Not sure on flow but they’re 452 stock heads no porting done. I will have to look into calculating the exhaust thank you.
 
318willrun said:
Read the list twice and didn't see what heads. I'd run a double pumper. Is this "feeling" off the seat of your pants test drive? No way for us to know if it's in the ballpark or not without knowing something about how you determine slow.
Click to expand...
Yes seat of the pants for now compared to the ole 360LA I pulled
 
fishmens67 said:
Let's just say a tuned smog 440 with a set of headers should put you in the back seat of an A-Body when you let the hammer down.
Click to expand...
That’s about what I was expecting. But that is not the case. It’s quick don’t get me wrong but not anywhere near the back seat.
 
fishmens67 said:
Let's just say a tuned smog 440 with a set of headers should put you in the back seat of an A-Body when you let the hammer down.
Click to expand...

standup303 said:
That’s about what I was expecting. But that is not the case. It’s quick don’t get me wrong but not anywhere near the back seat.
Click to expand...
Next time try a 318 .........



:lol:
 
When I bought my Duster it had a stock 440 with 8.5-1 compression,Edelbrock performer intake and Edelbrock 750 carb. Comp XE 274 cam and Schumacher tri y headers. Underwhelming to say the least.

Stock 452 heads would be the single biggest detriment to power IMO.
 
It’s basically a stock 440 with stock gearing and a big cam. Add in low compression and I could see it being sluggish.
 
A stock tuned 69 440 Dart or Barracuda with headers and slicks is capable of mid to high 12's in the 1/4.
 
fishmens67 said:
A stock tuned 69 440 Dart or Barracuda with headers and slicks is capable of mid to high 12's in the 1/4.
Click to expand...
That's disappointing. My low compression 360 with 3.23's and stock converter runs that without slicks and no posi.... :poke:
 
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