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post #1 of 32 (permalink) Old 07-28-2014, 11:32 AM Thread Starter
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Mild 460 Build Dyno Results

Got my engine back from its second trip to a machine shop for a proper ballancing job and clean up.

Here are the details

466 cubic inches
~9.5:1 Compression
C8VE Heads
Mild porting on the exhaust
2.19 Intake Valves
1.76 Exhaust Valves
Performer Intake
750 Summit Racing Carburetor
Comp Cams
XE262H Cam, Lifter and Spring Kit
Duration @ .050 218/224 (I/E)
Lift .513/.520 (I/E)
Hooker Mustang Swap Headers 1.875" primarys to 3.5" collector
Comp Roller Tipped Rocker arms

Peak Numbers: 385 HP @ 4900 RPM & 485 ftlbs @ 3700 RPM

Do these numbers seem a little low? I know the cam isn't huge and my Performer intake is probably the choke point. Would an 850-870 CFM Carburetor help make some more power?
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post #2 of 32 (permalink) Old 07-28-2014, 11:51 AM
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Those numbers seem to be right on the money to me. All in before 5000rpm. I can't imagine a bigger carb helping you at all. The cam is very small and with that induction setup you can see it will be a nice street engine (torque number is good).

That is basically a nice street performance/stock rebuild and hopefully you got hardened exhaust seats so you can enjoy it for a long time.
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post #3 of 32 (permalink) Old 07-28-2014, 06:02 PM Thread Starter
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Thanks for the response. I was running the water pump and alternator off the flywheel as well, so I guess there are some losses there too. The torque was solid though, between 485 and 400 ftlbs all the way to 5000 RPM
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post #4 of 32 (permalink) Old 07-28-2014, 07:18 PM
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yes the numbers are good but the roller tip rockers are for chevy's and the geometry is wrong you are leaving a little cam lift on the table, and yes it will make more power with a bigger carb
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post #5 of 32 (permalink) Old 07-28-2014, 08:31 PM
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According to Summit's "CFM Calculator", about 750cfm is your engines limit for racing and may even be more responsive on the street with something around 650cfm. Your header size would be optimum around 1 3/4". We always tend to go too big on carbs and headers, myself included.

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post #6 of 32 (permalink) Old 07-28-2014, 10:21 PM
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Summit's "CFM Calculator",

thier calculator may say that but I guarantee you put a holley HP 850 on it and it will make more HP
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post #7 of 32 (permalink) Old 07-28-2014, 10:48 PM
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Quote:
Originally Posted by butterbean View Post
Summit's "CFM Calculator",

thier calculator may say that but I guarantee you put a holley HP 850 on it and it will make more HP
What do you base going bigger on. What information do you have on the OP's engine that you can "guarantee" more HP? Just ask'n?
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post #8 of 32 (permalink) Old 07-28-2014, 11:05 PM
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What's the intended use for the engine???

Tag and ins it's a street car, how it gets there does it really matter?

Nobody's perfect but if u drive a ford your darn close.
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post #9 of 32 (permalink) Old 07-28-2014, 11:37 PM
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Cool

HP and TQ are about right for the combo as stated imo.

The modest lift on the cam, chevy geometry rockers and lack of port work to work with the larger valves are three stand out reasons I see.


We recently did a 9.75 to 1 466

Budget ported small valve heads 307/180 cfm @ .600" lift
Performer intake
219/227 voodoo cam .540" / .552" lift on a 111 lsa and l07 ICL
750 holley
Curved distributor with 34 total degrees timing. More did not make more power.


425 hp at 5000 rpm ''UNCORRECTED'' Multiply figures by 1.03 for STP gross HP
515 tq at 3300 rpm


Add rpm intake for 440 HP


This combo consistently makes these numbers on our local dyno which is the tightest one in the puget sound area.

This same combo with 10.3 to 1 static, Budget D3's, same voodoo cam and an rpm intake with 750 DP took a 3900 pound torino cobra to [email protected]


More port work with attention to the intake side !!!
proper roller rockers going to 1.8 ratio if the pistons have large valve reliefs and heads have dual springs.

Holley 750


You would pick up power no doubt.


Hope this helps.
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Last edited by The Mad Porter; 12-31-2014 at 11:40 AM.
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post #10 of 32 (permalink) Old 07-28-2014, 11:44 PM
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Quote:
Originally Posted by Colt View Post
What do you base going bigger on. What information do you have on the OP's engine that you can "guarantee" more HP? Just ask'n?
he's BEEN THERE DONE THAT JUST LIKE ME,It needs more carb,and cam

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post #11 of 32 (permalink) Old 07-29-2014, 12:45 AM
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Quote:
Originally Posted by BOSS 429 View Post
he's BEEN THERE DONE THAT JUST LIKE ME,It needs more carb,and cam

Now you are adding cam. See Mad Porter Post ^^^ All of that with 750cfm.

The OP's motor is mild lift, mild duration, no port work, 5000RPM's and 9.5 to 1. There won't be any air speed at all with the 850cfm. And then....Who know's? ,,but the ET Timer and Trap Speed Multiplier.
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post #12 of 32 (permalink) Old 07-29-2014, 07:42 AM
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Quote:
Originally Posted by Colt View Post
Now you are adding cam. See Mad Porter Post ^^^ All of that with 750cfm.

The OP's motor is mild lift, mild duration, no port work, 5000RPM's and 9.5 to 1. There won't be any air speed at all with the 850cfm. And then....Who know's? ,,but the ET Timer and Trap Speed Multiplier.
A 750 is ok for street use. If he is after all he can get out of the combo he has a small cam and intake change with a 850 it will gain more power.

Tag and ins it's a street car, how it gets there does it really matter?

Nobody's perfect but if u drive a ford your darn close.
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post #13 of 32 (permalink) Old 07-29-2014, 08:02 AM
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Quote:
Originally Posted by Colt View Post
Now you are adding cam. See Mad Porter Post ^^^ All of that with 750cfm.

The OP's motor is mild lift, mild duration, no port work, 5000RPM's and 9.5 to 1. There won't be any air speed at all with the 850cfm. And then....Who know's? ,,but the ET Timer and Trap Speed Multiplier.



yes, a cam would help.but if nothing else I'd add a larger carb

RICH
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post #14 of 32 (permalink) Old 07-29-2014, 09:40 AM
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Quote:
Originally Posted by Colt View Post
What do you base going bigger on. What information do you have on the OP's engine that you can "guarantee" more HP? Just ask'n?
I don't care what Summit's carb calculator suggests (and it's a generic suggestion at best) These big Fords like lots of carb and cam. My little 466" in my boat is running a 290* .634" cam and 1,500 CFM of carb and it LOVES it! THAT doesn't follow their carb suggestions I'll bet.
Rob

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post #15 of 32 (permalink) Old 07-29-2014, 09:54 AM
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Scotty J makes good points and has been there and done that, but the OP asked if a bigger carb will make more power and the answer is YES it will, it may not be as efficient as a 750 but will make more HP ..........
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