440CI SBC combo

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sstpres
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440CI SBC combo

Post by sstpres » Mon Mar 12, 2018 3:14 pm

Will this combo make 650HP on pump gas?

Iron eagle block. 4.125strokeX4.155bore
11.5CR
Roller cam: 305/311Adv., 293/279@.050", .680/650"(+1.6RR), 110LSA
AFR 245NPP Heads.
Ported Super Vic II and Dominator
1/3/4-1/7/8 step headers.

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sstpres
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Re: 440CI SBC combo

Post by sstpres » Mon Mar 12, 2018 3:21 pm

Sorry @.050 Intake was incorrect. 273@.050".

cgarb
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Re: 440CI SBC combo

Post by cgarb » Mon Mar 12, 2018 3:52 pm

If that wouldn't at least make 650 on pump gas, I would be pretty disappointed.

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Re: 440CI SBC combo

Post by Casper393W » Mon Mar 12, 2018 5:16 pm

cgarb wrote:
Mon Mar 12, 2018 3:52 pm
If that wouldn't at least make 650 on pump gas, I would be pretty disappointed.
I'm with him!! I would say somewhere like 725+ is more like it!

sstpres
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Re: 440CI SBC combo

Post by sstpres » Mon Mar 12, 2018 5:32 pm

Calculated Dyn. Comp. Came in at 8.15. So with good a cooling system 93 octane pump gas should be OK??

Gregory
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Re: 440CI SBC combo

Post by Gregory » Tue Mar 13, 2018 9:34 pm

Go to www.performancetrends.com and down load their Engine Analyse Pro simulation software (it’s free for ten days) and
enter your engine data and you will get a very close estimate. I’ve done engines similar to yours and the simulation and the results on my dyno were very close. This has been discussed here before but, I guess you missed that class.
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Re: 440CI SBC combo

Post by JoePorting » Wed Mar 14, 2018 3:31 am

If it's going to be more of a street car running 92 octane gas, I'd go with no more than 10:1 compression with a cam with 250 duration @ .050". I'd think you could still make your 650 hp goal with that setup.
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Re: 440CI SBC combo

Post by blownzoom440 » Wed Mar 14, 2018 8:31 am

I was going to say that is too long duration.
"69"satellite,3900lbs,8-71,edel victor heads,I/C,446cu.in W/gas 1250 carbs

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67RS502
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Re: 440CI SBC combo

Post by 67RS502 » Wed Mar 14, 2018 12:59 pm

I would hope it makes around 700hp with that much duration.
You could work the chambers some to lower the comp a bit if needed.
Also the step headers may loose a bit, 1 7/8" should make more.
Some will recommend 2" headers.
67 camaro
girly rollers on pumpgas:
420 - 641hp BretBauerCam, 1.39, 9.79 @ 137.5
383 - 490hp 224/224, 1.56, 10.77 @ 124.6
502 - 626hp 252/263, 049s 1.44, 10.08 @ 132.7
62 Nova cruiser
383/200-4R/12-bolt w 373s
224/224 HR cam
1.57 10.97 @ 121.2

sstpres
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Re: 440CI SBC combo

Post by sstpres » Wed Mar 14, 2018 3:13 pm

Talked to the head guys. They recommend a smaller duration cam. 267/273 @ .050".

Thanks for the inputs.

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Re: 440CI SBC combo

Post by levisnteeshirt » Wed Mar 14, 2018 10:29 pm

i know what big Joe would say if he was here , go with the one u have, its a 440 , not a 350
Last edited by levisnteeshirt on Wed Mar 14, 2018 11:01 pm, edited 1 time in total.

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MadBill
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Re: 440CI SBC combo

Post by MadBill » Wed Mar 14, 2018 10:38 pm

"And rev it up!" O:)
Felix, qui potuit rerum cognscere causas.

Happy is he who can discover the cause of things.

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Re: 440CI SBC combo

Post by BradH » Fri Mar 16, 2018 4:49 pm

sstpres wrote:
Wed Mar 14, 2018 3:13 pm
Talked to the head guys. They recommend a smaller duration cam. 267/273 @ .050".

Thanks for the inputs.
You still haven't clarified the application: Track-only? Street/strip? "Big" stall or stick-car? Etc., etc., etc., ...

How high are you willing to spin it? Do you have a max RPM limit based on components used or life expectancy?

FWIW, my 11.5 CR 452 ci BBM has a 266/266 @ .050" x .650+" solid roller... street/strip pig, although the engine still needs to get stuffed back in the car after last fall's dyno flog.

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Re: 440CI SBC combo

Post by sstpres » Fri Mar 16, 2018 6:05 pm

It's a street/strip deal. Motor only. Pump gas. Don't want to spin it over 7500. Going in front of a Coan TH350. We'll have them spec a converter.

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Re: 440CI SBC combo

Post by sstpres » Fri Mar 16, 2018 6:13 pm

Using a Bullet roller.

301/266 .450" Lobe
313/268 .452" Lobe
LSA- 108
1.65/1.55 shaft rockers.

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