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Old 06-24-2013, 06:36 PM
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SBC 383 Advice shooting for 550hp to 600hp

Hi All, :-)

Its finally time for me to build my motor and have been reading a lot and would like to know your thoughts on my selection so far.

Car is a 1984 monte carlo ss that will see mostly street and just alittle on the track. My goal is 550hp to 600hp amd a little bit over 500TQ to FLYWHEEL. 4 Speed 700r4 w/ 4.11 gear & Power Brakes

So far

AFR 210cc competiton Heads with 650 lift hyd roller springs
Howards part# 113155-10S (Hyd Roller 600/600 lift 247/255 @ 050 on 110 LSA)
Motown single plan intake Manifold Part# 061040
SRP Forged Pistons part# 271055
Scat Forged 5.7 I beam Rods
Eagle Crank not forged
11.1.1 Compression
Scorpion Performance SRPST2112SBR - Scorpion Short Travel Retrofit Hydraulic Roller Lifters
1.5 Scorpion Platinum Series Rocker Arms
Scorpion pushrods
Howards Cams Rev Kits Part #90131
3500 Stall converter


Carb wise probably a AED 750ho-hp series Carb

1 3/4 - 1 7/8 in. Primary, 3.50 in. Collector Schoenfeld Headers Part# 186v
will be upgrading to 3in exh with x pypes dumpes...

Any advise or something you would do differently? My local engine builder here in Gary,IN is Cory's performance, He have been so helpful so far just looking for a few more advice to get what i'm shooting for
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Old 06-24-2013, 07:06 PM
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Why not just go with Scats complete rotating assembly, it will have to be balanced. The flex plate, Harmonic balancer, crank piston and rods need to matched. Scat will send it out to you complete. Your CR is a little high unless you plan on running about 105 octane.
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Old 06-24-2013, 07:26 PM
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Quote:
Originally Posted by desmosis10 View Post
Car is a 1984 monte carlo ss that will see mostly street and just alittle on the track. My goal is 550hp to 600hp amd a little bit over 500TQ to FLYWHEEL. 4 Speed 700r4 w/ 4.11 gear & Power Brakes
With any kind of cam at all, you will not have enough manifold vacuum to operate power brakes, so you may as well begin looking into a hydroboost system. I don't care what anyone says, vacuum-operated brakes will not work correctly with less than 18 inches hg. Been there, done that.

Quote:
Originally Posted by desmosis10 View Post
AFR 210cc competiton Heads with 650 lift hyd roller springs
Howards part# 113155-10S (Hyd Roller 600/600 lift 247/255 @ 050 on 110 LSA)
11.1:1 static compression ratio
At sea level and 60 degrees F., these heads will flow enough to make 600 horsepower. You don't need this much cam or this much static compression ratio. Don't plan on winding this long arm (3.750") any more than about 6200-6300, because that's where hydraulic roller lifters begin lofting off the lobe of the cam and things get dicey with all the weight slingin' around in the crankcase. I see that you included a rev kit to wind the motor higher. Forget that. You will not need to rev the motor higher than the limit for juice roller lifters (about 6300).

Bring the static compression ratio down to 10.5:1 and reel the cam in a little, like 235/240 on the intake.

Quote:
Originally Posted by desmosis10 View Post
Motown single plan intake Manifold Part# 061040
You will not need a single plane intake to make max hp with this combo. If revs are limited to around 6300, a Performer RPM will make more power under curve from idle to 6300 than a single plane intake manifold.

Quote:
Originally Posted by desmosis10 View Post
SRP Forged Pistons part# 271055
Static compression ratio too high for pump gas. Use a piston such as this with the 75cc AFR heads for a SCR of 10.46:1...
KB Pistons for Automotive Applications

Quote:
Originally Posted by desmosis10 View Post
1 3/4 - 1 7/8 in. Primary, 3.50 in. Collector Schoenfeld Headers Part# 186v
will be upgrading to 3in exh with x pypes dumpes...
1 3/4" will be a God's plenty.....
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Old 06-24-2013, 08:04 PM
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If you reach your HP/Torque goal,you may wanna take your spare tire outta the trunk to make room for a couple of those 700R4's for spares,or,be prepared to lay down some big bucks one that will hold up to that kinda HP/Torque.It can be built to handle it,but,it'll cost ya big.
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Old 06-24-2013, 08:05 PM
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Quote:
Originally Posted by techinspector1 View Post
With any kind of cam at all, you will not have enough manifold vacuum to operate power brakes, so you may as well begin looking into a hydroboost system. I don't care what anyone says, vacuum-operated brakes will not work correctly with less than 18 inches hg. Been there, done that.


At sea level and 60 degrees F., these heads will flow enough to make 600 horsepower. You don't need this much cam or this much static compression ratio. Don't plan on winding this long arm (3.750") any more than about 6200-6300, because that's where hydraulic roller lifters begin lofting off the lobe of the cam and things get dicey with all the weight slingin' around in the crankcase. I see that you included a rev kit to wind the motor higher. Forget that. You will not need to rev the motor higher than the limit for juice roller lifters (about 6300).

Bring the static compression ratio down to 10.5:1 and reel the cam in a little, like 235/240 on the intake.


You will not need a single plane intake to make max hp with this combo. If revs are limited to around 6300, a Performer RPM will make more power under curve from idle to 6300 than a single plane intake manifold.


Static compression ratio too high for pump gas. Use a piston such as this with the 75cc AFR heads for a SCR of 10.46:1...
KB Pistons for Automotive Applications


1 3/4" will be a God's plenty.....
My cam revs up to 6800 rpm and with the duration at @.050 is 247/255 it can reach to 7000 rpm if I was taking it that high. Also Im using the scorpion short travel lifters that can rev up to 7000 rpm with know problem..
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Old 06-24-2013, 08:53 PM
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OK, apparently you didn't get it when I said it before, so I'll say it again.

1. That long 3 750" arm ain't gonna take lightly to being spun that high.
2. You don't need to spin the motor that high to make the power you want to make.

Now, go ahead and blow it up hard head and stop asking for advice if you have no intention of listening.
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Old 06-24-2013, 08:57 PM
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That cam will likely not rev 6500 well.
change the cam to a solid roller.
headers sound about right.220 heads perhaps?
My power brakes work with a 256/264 cam.
would probably use a 108/108 cam
victor junior manifold
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Old 06-25-2013, 08:50 AM
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You said your using a eagle crank and its not forged. If you use a cast crank then it will break in time as a cast crank for a small block will not handle that amount or power to long before it goes. Safe range for those is around 450ish and that is borderline as what most research points too. Eagle and Scat say 500hp or less but I would never use a cast crank pushing that much power. I have a sbc 350 making around 425-450 hp and I would still like to get a forged crank for it someday. I would take the advice on the boards here from guys like techinspector1 as they know there stuff and have taught me a lot. I got two hydraulic roller motors and I even have the so called anti pump up lifters and they are good to a little over 6300 then they are done. I don't take mine over 6 grand to be safe.
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Old 06-25-2013, 04:37 PM
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i can't comment for how much rpm's you'll be needing to rev to realize that power goal. i'm with you on the rev-ability of the hydro-roller valvetrain with better lifters and rev kit tho. but thinking you're indeed a bit limited with the 3.75" stroke and resulting feet/sec mean piston speeds (at 7krpm a 350 has the same MPS as a 383 spinning at 6.5krpm) .. not so sure about the weight slinging around as brought in by techinspector, maybe he can give some more thoughts on that.
also cast crank dont seem appropriate to me either, and step up to 6" rods while you're at it for a more favorable rod/stroke ratio. maybe complete balanced rotating assembly would be the better ticket.
for DCR we're prolly looking at something in the 8.5 range?

Last edited by janus; 06-25-2013 at 04:43 PM.
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