CAN I GET TO 700hp???
11-18-2018, 11:35 AM
#22
Safety Car
a 360 cfm head at .600 lift which is what you have in street trim can support 740 plus hp. The formula for high performance street is head flow × .258 x 8
360 x .258 x 8 = 743 hp that is the potential. Well optimized of course. In race trim with race compression ratios and cam even more.
360 x .258 x 8 = 743 hp that is the potential. Well optimized of course. In race trim with race compression ratios and cam even more.
11-18-2018, 11:41 AM
#23
Dr. Detroit
Member Since: Mar 2012
Location: New Braunfels Texas
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Yep! The AFR race oval flows like gangbusters so take advantage of it! It will probably make more than 700+......like 750+
These heads and the Brodix race oval are the two baddest heads for BBC up to 850-860 hp or so.......mega velocity.....torque everywhere....no compromise of power. But they want some cam.........
My favorite cam for these heads is the old .748/.714 Comp solid bracket cam.......it is fairly easy on springs and is a proven power maker....but may be more duration than you want on the street.....although it is a very streetable cam in a 500 inch motor.
Jebby
These heads and the Brodix race oval are the two baddest heads for BBC up to 850-860 hp or so.......mega velocity.....torque everywhere....no compromise of power. But they want some cam.........
My favorite cam for these heads is the old .748/.714 Comp solid bracket cam.......it is fairly easy on springs and is a proven power maker....but may be more duration than you want on the street.....although it is a very streetable cam in a 500 inch motor.
Jebby
Last edited by Jebbysan; 11-18-2018 at 11:43 AM.
11-18-2018, 12:16 PM
#25
Dr. Detroit
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11-18-2018, 01:36 PM
#27
Le Mans Master
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For 700hp out of a 496, I agree that you will have to spin it up some. I imagine your cam would peak in the 5800-6000 rpm range. I would think you would need to get the peak more around 6500 to hit 700. You have the heads that will support it. I understand on the brakes. I have manual brakes so not concerned with that. Don’t worry, with a manual transmission, decent gears and 496 inches, most cams will be streetable. I definitely think you will need more cam for 700. My builder joked that on some Dyno’s (wink wink) mine would be near 700. I look at some builds and the horsepower they make and I can’t understand why mine doesn’t make more, but hopefully it is enough for awhile lol.
Last edited by 69ttop502; 11-18-2018 at 01:42 PM.
11-18-2018, 02:23 PM
#30
Team Owner
I had horrible wheel hop and the ability to do 100 yard burn out from a 30 mph rolling start. It was on the verge of being dangerous. I quit letting my wife drive when I went to a bigger motor. I went to a 5 speed without TQ multiplication and a 22 pound flywheel and it became very civil to drive.Any motor the valve timing events (over lap) kinda determines engine vacuum. Variables like more CI make for more vacuum. another vacuum increaser is just using a higher idle. Some people insist on low idle so they can impress their buddies with the hot cam sound. My two motors actually like 1100 rpm hot idle and create nearly 12.5 bouncy inches of vacuum. I've never had brake or other vacuum issues.
11-18-2018, 02:57 PM
#31
Race Director
a 360 cfm head at .600 lift which is what you have in street trim can support 740 plus hp. The formula for high performance street is head flow × .258 x 8
360 x .258 x 8 = 743 hp that is the potential. Well optimized of course. In race trim with race compression ratios and cam even more.
360 x .258 x 8 = 743 hp that is the potential. Well optimized of course. In race trim with race compression ratios and cam even more.
Thus the reason I stated yes, he can achieve 700+hp,.. and I quoted as high as 740... hmmmm:-)
*
11-18-2018, 02:59 PM
#32
Melting Slicks
Point is, your 496's biggest problem will be traction, not power.
Mike
11-18-2018, 03:02 PM
#33
Melting Slicks
Mike
11-18-2018, 03:10 PM
#34
Race Director
I have to disagree with you on this one Paul. I have a solid roller in my 406 and when I check the lash, it virtually never changes. I put 4000 miles on one summer and it had the same lash as it did when I first set them. I do have 7/16ths studs and stud girdles, so everything is locked down good.
Mike
Mike
With the new hydraulic lifters that are out there now, they are good to 7000+ RPM.. and the power loss is like less than 1%... So I would still run hydraulic with a under 7K machine ..
I see a lot of things as what do you get, and what do you have to give for it.. I see more give then get from a solid.. JMHO..
I think I remember you were running about the same power as I am.. and I am on hydraulic,,,
Last edited by pauldana; 11-18-2018 at 03:12 PM.
11-18-2018, 04:35 PM
#35
Race Director
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2020 C2 of the Year - Modified Winner
2020 Corvette of the Year (performance mods)
C2 of Year Winner (performance mods) 2019
2017 C2 of Year Finalist
trying to hit the 700 mark, what do you think.
BBC 496 build
-4 bolt mains with ARP studs
-scat forged crank
-scat forged h beam rods with ARP upgrade
-wiseco forged +20cc dome pistons
-solid roller Straub cam
248 253 @.050
.640 lift
108 LSA
-AFR 290 full CNC heads with 113cc CC.
-RPM Airgap intake
-ProSystems little monster 1050
-11:1 compression
ive seen some builds from mark that hit over 700 But I know there’s a lot of experience and talent going into his builds.
BBC 496 build
-4 bolt mains with ARP studs
-scat forged crank
-scat forged h beam rods with ARP upgrade
-wiseco forged +20cc dome pistons
-solid roller Straub cam
248 253 @.050
.640 lift
108 LSA
-AFR 290 full CNC heads with 113cc CC.
-RPM Airgap intake
-ProSystems little monster 1050
-11:1 compression
ive seen some builds from mark that hit over 700 But I know there’s a lot of experience and talent going into his builds.
We just dyno'd a 528" Hemi for a buddy. 10 to 1 compression, 252* cam on a 108 LSA, mid .600's lift and Edelbrock heads. He wanted it mild enough to cruise cross country and not hurt stuff...so we went real mild on compression and cam. It made 694 HP@6000 RPM and 673 lb ft @4500. Interestingly it was making well over 600 lb ft all the way down at 3000 RPM. So it's making 90% TQ from way down there and still hanging in well at 6500+. For what he's going to do with it...it's going to be a blast!
Of course...now we're planning the "REAL" street Hemi. He's already got a new KB aluminum block. It will be a 572" with a slightly nastier personality! LOL.
JIM
Last edited by 427Hotrod; 11-18-2018 at 04:35 PM.
11-18-2018, 04:48 PM
#36
Yes I’m super excited, got all my parts to put it together minus a few and been sitting there. Good winter project but now have this 402 to do for my daily k20. Man these are fun maybe next I’ll go all out but mine as it is will be badder than 90% on the road. Tons of fun man I can’t wait. And you guys are right, even shy of 700 it’s not going to hook so I’m already quite a bit above usable horsepower anyways. Thanks guys. You guys have some kickass combos.
11-18-2018, 06:24 PM
#38
Team Owner
I don't have scientific research study information, but if you built the ultimate h roller lobe profile and ultimate solid roller. The h roller lobe has to be so much milder that it is not with in 1%
11-18-2018, 07:08 PM
#39
Melting Slicks
I see original, stock 6L engine from 2002 make 1000rwhp on a dynojet. Thats over 1000 at the crank for a motor that costs about $1500.
And then driving it daily in a work truck like nothing.
Heres one of them, this is an original bottom end 6L with a cam and a turbo going 9's and 1k rwhp.
there are hundreds now since (2004~) this caught on. So,
What is this obsession with expensive, less reliable engines that make less power? High lift and powerful springs are hell on a valvetrain for example.
Why when you can use low lift, gentle ramps and lightsprings to make almost double the power?
Even the 4.8L, $500 engines from 04' handle 700horsepower.
seriously $1 per horsepower is possible in 2018
just sayin' try not to get mad
And then driving it daily in a work truck like nothing.
Heres one of them, this is an original bottom end 6L with a cam and a turbo going 9's and 1k rwhp.
there are hundreds now since (2004~) this caught on. So,
What is this obsession with expensive, less reliable engines that make less power? High lift and powerful springs are hell on a valvetrain for example.
Why when you can use low lift, gentle ramps and lightsprings to make almost double the power?
Even the 4.8L, $500 engines from 04' handle 700horsepower.
seriously $1 per horsepower is possible in 2018
just sayin' try not to get mad
11-18-2018, 07:24 PM
#40
Le Mans Master
Member Since: Mar 2001
Location: Watkinsville, GA and Glen Cove, NY
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Because when you open the hood and see that big block in there, nothing else needs to be said! Why can’t a well built big block be as reliable as an LS. I have had both, and while I love the LS, there was no way anything was going in my 69 Vette other than a high hp big block.