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454 7k rpm choices

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Re: 454 7k rpm choices

Postby F-BIRD'88 » Wed Jan 11, 2017 2:18 pm

If you want to build a 427 BBC and have it make a real 600hp and not be a RACE motor,
Then again BUILD a Supercharged 427 BBC with a (relative) mild valve action STREET design solid STREET roller cam.
If you want to build a N/A 600HP street BBC build at least 496 CID. Easy on a 425" bore 427-454 block.

A blown 383 with decent heads built of the same nature will more than get it done.
The job (600 Real street flywheel brake horsepower) is the same and you already own the SBC.
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Re: 454 7k rpm choices

Postby Newold1 » Wed Jan 11, 2017 2:59 pm

That's really the whole main point of this OP post as far as a reasonable answer is involved. Why go to the expense and trouble to build a mild mannered street friendly 427 supercharged engine? Superchargers are expensive and space challanged compared to a 496 cubic inch normally aspirated simple carbed engine with 10.5 to 11.0 to compression that will easily make his 600HP with very decent street manners and a less expensive budget build than a supercharged 427. KISS theory at work again.
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Re: 454 7k rpm choices

Postby pdq67 » Wed Jan 11, 2017 3:00 pm

Heck, per D2k, my 496, "tow-truck", engine at only 9.5 to 1 CR should make 550hp so by just installing my UDHarold cam should put me up to probably 625hp!

I really don't think that you will hit 600hp with a 427 engine because back then even the, "knarly", ones were only about 540hp or so!!

And I'm talking about the L-88's and such here is all. But the still-born 454, LS-7, would hit 600hp with no more than a set of 4-tube, long tube open headers..

12 to 12.5 to 1 CR just isn't feasible because we can't buy Sunoco 260 gas!

But of course you can use E85 and up your CR to 13.5 to 14 to 1 and go from there. Heck, I'm reading that it is good to 17 to 1 CR...

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Re: 454 7k rpm choices

Postby CamKing » Wed Jan 11, 2017 3:31 pm

cuisinartvette wrote:Cam King think your cam would live awhile on the st meaning ramps good enough to make power but not crazy?

Yes. Those lobes were actually designed for endurance. I would figure it'll last at least 36,000 miles
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Re: 454 7k rpm choices

Postby ap72 » Wed Jan 11, 2017 4:53 pm

"Sick of high maintenance builds"

You can get 600hp out of a 496 running 87 octane and a hydraulic roller cam.

If you want it to sound mean just put too big of a cam in it. Want a single plane manifold? Why not run a single plane efi manifold?


4.10s and a 28" tire in a 3500lb car has you crossing the line at roughly 6000rpm.

Yea, there are a lot of fast cars running this type of setup so it may seem boring. But there's a reason there are a lot of fast cars running this type of setup, it works!
LOL, according to the post count I'm an "expert." The only thing I'm an expert at is asking questions.
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Re: 454 7k rpm choices

Postby VMC » Wed Jan 11, 2017 8:32 pm

pdq67 wrote:Didn't the old, "still-born", LS-7 make right at 600hp or a skosh more back then with no more than a good set of headers, (open), on it?
pdq67


No.

Lingenfelter ran one straight out of the crate with 2 1/4" X 4" headers and an 850. It made 489 HP @ 6K and 481 tq. @ 4K.
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Re: 454 7k rpm choices

Postby F-BIRD'88 » Wed Jan 11, 2017 9:18 pm

Yes the supercharger is a investment but very reasonable and long lasting and makes the real power
you want in street reliable form. The simplicity of a low cr 383 SBC for that or even and very basic 427 BBC w flat top pistons (low cr) offsets that cost. and the package all fits under the Camino hood.
It is not space challenged.
It must run on premium unleaded. Kicking up the boost and power is a option using high octane gas for a track day is a consideration but if you want 600hp real power on the street it has to perform on pump premium.

Forget 87 octane gas. With a 6 speed manual trans you do not need to rev the piss out of it
so a hyd roller will get it done. But a solid STREET roller (moderate duration and lift and spring pressure really gets it done)

Again if you want a 600hp N/A motor build a 496 +cid with a 427-454 block
Do not bother with a 427cid based N/A build for a real deal street 600hp. That is a race engine.

You need to look at the usability of that 383. You already own it.
What is it?
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Re: 454 7k rpm choices

Postby vortecpro » Thu Jan 12, 2017 8:19 am

F-BIRD'88 wrote:Yes the supercharger is a investment but very reasonable and long lasting and makes the real power
you want in street reliable form. The simplicity of a low cr 383 SBC for that or even and very basic 427 BBC w flat top pistons (low cr) offsets that cost. and the package all fits under the Camino hood.
It is not space challenged.
It must run on premium unleaded. Kicking up the boost and power is a option using high octane gas for a track day is a consideration but if you want 600hp real power on the street it has to perform on pump premium.

Forget 87 octane gas. With a 6 speed manual trans you do not need to rev the piss out of it
so a hyd roller will get it done. But a solid STREET roller (moderate duration and lift and spring pressure really gets it done)

Again if you want a 600hp N/A motor build a 496 +cid with a 427-454 block
Do not bother with a 427cid based N/A build for a real deal street 600hp. That is a race engine.

You need to look at the usability of that 383. You already own it.
What is it?


http://www.chevelles.com/forums/13-perf ... -test.html
NHRA Stocker Cranks
Crankshaft Repair
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http://www.Vortecpro454.com
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Re: 454 7k rpm choices

Postby cuisinartvette » Thu Jan 12, 2017 8:41 am

Nice to see you pop in Mark youll probably be a part of this one

on a 427 blocks are just too much just a bigger 383 in a sense
Lingenfelter ran one straight out of the crate with 2 1/4" X 4" headers and an 850. It made 489 HP @ 6K and 481 tq. @ 4K

Yep...that wont be enough bet what I have surpasses it maybe at peak anyway

Love superchargers oh yes. one way or another that wll run me 5k just not in the cards right now
the KISS theory works. If I was 10 yrs younger in a good economy Id go bonkers like I did with this
As it is my biggest challenge is to not use my wheelchair. Things changed fast but not ready to give up the car
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Re: 454 7k rpm choices

Postby F-BIRD'88 » Fri Jan 13, 2017 1:24 pm

When this 427 BBC is removed from the 70 Camaro and installed in this posters Street driven 67 El Camino and it runs 11.3 @119 at the track....Does the poster get his money back?
(promised 10sec ET)

Thats what it will run in this street El Camino, six speed trans and all. If it does (11.3@119) it will be a very good job.

Superchargers do not cost $ 5000. two different discussions.
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Re: 454 7k rpm choices

Postby vortecpro » Fri Jan 13, 2017 10:26 pm

1320 divided by 127.3=10.36, as you can see this Camaro was far from optimized. I give the OP more credit, he does live in the valley, low altitude, I think he can show more than 119MPH with his stick, I know I could. I did drive my NA big block Chevelle (3500 pounds) right down the 118 on 93 octane to LA County and run 9.8s then home.
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Re: 454 7k rpm choices

Postby MTENGINES » Tue Jan 17, 2017 2:30 am

CamKing wrote:305cc rectangle port AFR head. If you want to go with an oval port, go with the 290cc AFR

Cam# BBCM, M79362-80362-110
260/263 @.050"
.362"/.362" Lobe Lift
110 LSA



4 years ago I did a 461bbc for a close friend for his chevelle.
11:1 AFR 305 untouched
1050 dominator
port matched sniper jr with .600" milled off the carb base
264/268@.050 109 solid roller .410 lobe
1-7/8 hookers

772hp 591tq
customer puts 2,000 miles a year on it
pump premium with a splash of 110 just for the smell.
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Re: 454 7k rpm choices

Postby hereinmissoula » Tue Jan 17, 2017 8:30 am

http://www.chevelles.com/forums/13-perf ... ?_k=2hcoru

this is my current build, waiting on pushrods.. just measured for them..

anyways im a 454\.030 over race rite oval , bullet soild flat (not huge , harolds lobe, 248\255 @.050, air gap, aed 950, 1 7\8 header....

most think i will fall just short of 600..
i was hopeful but 575 i bet... if i had choice to change piston i would have done afr265\290 and hit it ...

figure i show you my combo as its close to what you want and should have a great curve .....
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Re: 454 7k rpm choices

Postby F-BIRD'88 » Tue Jan 17, 2017 1:28 pm

Looking thru your past threads on your Camino and your dissatisfaction with the 385 SBC
you made the classic error of building a very high compression ratio engine (11.5:1)
and want to street drive it on street pump gas (91 octane stuff in your case)

If you want it to run on street pump gas why not fix that so it does.
Replace the pistons with new pistons that will give a true 10:1cr.
Now it will run on your pump gas every day.

Yes racy roller cams like yours need a bit of routine maintenance.
So replace the roller lifters, cam button and distributor gear.
With NEW.... Ebay the used lifters for $100....
and maybe the valve springs too and you re good to go for say 2 more years of street driving. Set the valve lash 2 times a summer cruise season or 3 times a year.
Set the valve lash TIGHTER than what the cam card says. .008" to .010" LESS
This in of it self will help things LAST longer and stay on spec longer.
(especially with aluminum heads)
The big problem is the excessive high compression ratio.
And you are wanting to make the SAME mistake on a planed Big block.
It will not run on your 91 octane gas with wanted "11-12" compression.
Where the ..... are you going to find race gas 200 miles from home?

10:1cr is what you want... Not 11:1 not 11.5:1

Fix the build error so you can drive it and enjoy your car. Change the pistons
It will still go like hell and you won't need to retard the timing to drive it.
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Re: 454 7k rpm choices

Postby F-BIRD'88 » Tue Jan 17, 2017 1:45 pm

With a 64cc head and flat top pistons I don't get your claimed 11.50:1cr
on your 385cid SBC...

I get 11.03:1 cr with that and a 0 deck height. And you can correct it for true 91 octane daily reliable pump gas operation.
But you will need to disassemble the motor to do that.
May only require some piston dish machining and combustion chamber carving
No rebalancing required.
Get it down to a bit less than 10.50:1 true for 91 octane.
If it was run hard on pump gas it probably needs freshing anyway.
(rings+ bearings and inspection)

There is no free lunch when it comes to reliable 91 octane pump gas real street driving
and you are headed down the same big rabbit hole error with any BBC with 11:1cr.
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