Re: Need ideas for a 450HP build on my 383/ street motor?
[Re: RUMBLON]
#975482
04/18/11 07:47 AM
04/18/11 07:47 AM
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Joined: Oct 2003
Posts: 21,345 Marysville, O-H-I-O
70Cuda383
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Too Many Posts
Joined: Oct 2003
Posts: 21,345
Marysville, O-H-I-O
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stock stroke, high compression, good heads, and a big cam would get you there I'd think.
or you can cheat, drop a 440 stroke crank in there from your choice of stroker sources, (aftermarket that's already made for the 383/400 mains) and turn the 383 into a 426, 431, or 438 depending on how much you have to bore the cylinders. That, combined with compression, head flow, and cam, will get you 450-500 hp that is VERY streetable.
my 383 stroker was making over 500 lbs of torque at 3,000 rpm where the dyno started measuring, and it stayed at a nice flat 500 lbs through the RPM range, peaking at 535 at 3800, and made a peak of 505 hp. that's with the above combo--440 stroke, flat top pistons, eddy heads, comp's xe-275-hl hydraulic cam.
**Photobucket sucks**
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Re: Need ideas for a 450HP build on my 383/ street motor?
[Re: Mr.Yuck]
#975484
04/18/11 12:33 PM
04/18/11 12:33 PM
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Joined: Aug 2003
Posts: 8,716 Baltimore/Denver
64Post
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master
Joined: Aug 2003
Posts: 8,716
Baltimore/Denver
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I'd suggest a smaller stroker (438) with a stable CH piston, Stealth/Eddy heads, Eddy RPM, higher compression at your altitude, a nice hyd. cam, 1-3/4" headers, 2-1/2 exhaust. Should have no problem hitting 450 HP. It's also do-able with stock displacement but you'd have to get a bit more aggressive with the choices.
I made about 560 HP (and left about 20-30 HP on the table) with my 383/451, but it's not a cruising combo.
Last edited by 64Post; 04/18/11 12:36 PM.
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Re: Need ideas for a 450HP build on my 383/ street motor?
[Re: 70Cuda383]
#975485
04/18/11 01:27 PM
04/18/11 01:27 PM
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Joined: Jan 2003
Posts: 16,123 Grand Haven, MI
patrick
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 16,123
Grand Haven, MI
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Quote:
stock stroke, high compression, good heads, and a big cam would get you there I'd think.
or you can cheat, drop a 440 stroke crank in there from your choice of stroker sources, (aftermarket that's already made for the 383/400 mains) and turn the 383 into a 426, 431, or 438 depending on how much you have to bore the cylinders. That, combined with compression, head flow, and cam, will get you 450-500 hp that is VERY streetable.
my 383 stroker was making over 500 lbs of torque at 3,000 rpm where the dyno started measuring, and it stayed at a nice flat 500 lbs through the RPM range, peaking at 535 at 3800, and made a peak of 505 hp. that's with the above combo--440 stroke, flat top pistons, eddy heads, comp's xe-275-hl hydraulic cam.
for a street driver I'd follow this recipie...the smallish cam should have good streetability, tons of torque and good power to about 5500 RPM.
if you're buying a new crank, I'd go past the 3.75" stroke and into a 4.15" crank, if you can find a shelf piston for a 4.28" bore/4.15" stroke combo. would yield 478 cubes and probably 520-560 lb ft of torque, with about 500 HP
1976 Spinnaker White Plymouth Duster, /6 A833OD 1986 Silver/Twilight Blue Chrysler 5th Ave HotRod **SOLD!*** 2011 Toxic Orange Dodge Charger R/T 2017 Grand Cherokee Overland 2014 Jeep Cherokee Latitude (holy crap, my daughter is driving)
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Re: Need ideas for a 450HP build on my 383/ street motor?
[Re: patrick]
#975486
04/18/11 01:29 PM
04/18/11 01:29 PM
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Joined: Jan 2003
Posts: 74,979 U.S.S.A.
JohnRR
I Win
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I Win
Joined: Jan 2003
Posts: 74,979
U.S.S.A.
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Quote:
Quote:
stock stroke, high compression, good heads, and a big cam would get you there I'd think.
or you can cheat, drop a 440 stroke crank in there from your choice of stroker sources, (aftermarket that's already made for the 383/400 mains) and turn the 383 into a 426, 431, or 438 depending on how much you have to bore the cylinders. That, combined with compression, head flow, and cam, will get you 450-500 hp that is VERY streetable.
my 383 stroker was making over 500 lbs of torque at 3,000 rpm where the dyno started measuring, and it stayed at a nice flat 500 lbs through the RPM range, peaking at 535 at 3800, and made a peak of 505 hp. that's with the above combo--440 stroke, flat top pistons, eddy heads, comp's xe-275-hl hydraulic cam.
for a street driver I'd follow this recipie...the smallish cam should have good streetability, tons of torque and good power to about 5500 RPM.
if you're buying a new crank, I'd go past the 3.75" stroke and into a 4.15" crank, if you can find a shelf piston for a 4.28" bore/4.15" stroke combo. would yield 478 cubes and probably 520-560 lb ft of torque, with about 500 HP
There isn't a shelf piston for that stroke , 3.75 , 3.9 and 4.25 all use the same CH piston , 1.32 . Diamond has a piston for a 3.75 stroke using the std length B rod for a taller piston .
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Re: Need ideas for a 450HP build on my 383/ street motor?
[Re: JohnRR]
#975488
04/18/11 04:10 PM
04/18/11 04:10 PM
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Joined: Aug 2003
Posts: 8,716 Baltimore/Denver
64Post
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master
Joined: Aug 2003
Posts: 8,716
Baltimore/Denver
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Quote:
Quote:
Quote:
stock stroke, high compression, good heads, and a big cam would get you there I'd think.
or you can cheat, drop a 440 stroke crank in there from your choice of stroker sources, (aftermarket that's already made for the 383/400 mains) and turn the 383 into a 426, 431, or 438 depending on how much you have to bore the cylinders. That, combined with compression, head flow, and cam, will get you 450-500 hp that is VERY streetable.
my 383 stroker was making over 500 lbs of torque at 3,000 rpm where the dyno started measuring, and it stayed at a nice flat 500 lbs through the RPM range, peaking at 535 at 3800, and made a peak of 505 hp. that's with the above combo--440 stroke, flat top pistons, eddy heads, comp's xe-275-hl hydraulic cam.
for a street driver I'd follow this recipie...the smallish cam should have good streetability, tons of torque and good power to about 5500 RPM.
if you're buying a new crank, I'd go past the 3.75" stroke and into a 4.15" crank, if you can find a shelf piston for a 4.28" bore/4.15" stroke combo. would yield 478 cubes and probably 520-560 lb ft of torque, with about 500 HP
Diamond has a piston for a 3.75 stroke using the std length B rod for a taller piston .
Good call. Didn't know about those pistons. By my math that gives a 1.75"-ish CH. Not too tall; not too short. A cleaned up stock forged crank and maybe some new CCJ rods and you're into it pretty reasonably.
Last edited by 64Post; 04/18/11 04:12 PM.
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Re: Need ideas for a 450HP build on my 383/ street motor?
[Re: JohnRR]
#975490
04/18/11 04:34 PM
04/18/11 04:34 PM
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Joined: Jan 2003
Posts: 16,123 Grand Haven, MI
patrick
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 16,123
Grand Haven, MI
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Quote:
Quote:
Quote:
stock stroke, high compression, good heads, and a big cam would get you there I'd think.
or you can cheat, drop a 440 stroke crank in there from your choice of stroker sources, (aftermarket that's already made for the 383/400 mains) and turn the 383 into a 426, 431, or 438 depending on how much you have to bore the cylinders. That, combined with compression, head flow, and cam, will get you 450-500 hp that is VERY streetable.
my 383 stroker was making over 500 lbs of torque at 3,000 rpm where the dyno started measuring, and it stayed at a nice flat 500 lbs through the RPM range, peaking at 535 at 3800, and made a peak of 505 hp. that's with the above combo--440 stroke, flat top pistons, eddy heads, comp's xe-275-hl hydraulic cam.
for a street driver I'd follow this recipie...the smallish cam should have good streetability, tons of torque and good power to about 5500 RPM.
if you're buying a new crank, I'd go past the 3.75" stroke and into a 4.15" crank, if you can find a shelf piston for a 4.28" bore/4.15" stroke combo. would yield 478 cubes and probably 520-560 lb ft of torque, with about 500 HP
There isn't a shelf piston for that stroke , 3.75 , 3.9 and 4.25 all use the same CH piston , 1.32 . Diamond has a piston for a 3.75 stroke using the std length B rod for a taller piston .
then I'd probably go 3.9 or 4.25 for a street car, and keep the powerband in the idle-5500 RPM range.
1976 Spinnaker White Plymouth Duster, /6 A833OD 1986 Silver/Twilight Blue Chrysler 5th Ave HotRod **SOLD!*** 2011 Toxic Orange Dodge Charger R/T 2017 Grand Cherokee Overland 2014 Jeep Cherokee Latitude (holy crap, my daughter is driving)
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Re: Need ideas for a 450HP build on my 383/ street motor?
[Re: patrick]
#975491
04/18/11 05:03 PM
04/18/11 05:03 PM
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Joined: Jan 2004
Posts: 457 Hightstown, NJ
njdevil2
mopar
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mopar
Joined: Jan 2004
Posts: 457
Hightstown, NJ
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Not to hijack this thread, but I plan to do something simaler, I'm trying to do 400 HP with a stock '70 roadrunner 383. It already has a 440 cam and 9.5:1 compression. It has the CH4B (I think) Aluminum Edelbrock intake from 1969. I have aquired a Holley 670 Street Avenger. I'm pretty sure that the 1.75" headers are the thing I need for the exhaust with 2.5" exhaust pipes. Does this sound like the right recipe? I'm trying not to mod the internals, it's a recent rebuild. Any suggestions on the header brand?
1970 road runner Convertible 1 of 179
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Re: Need ideas for a 450HP build on my 383/ street motor?
[Re: njdevil2]
#975494
04/18/11 08:44 PM
04/18/11 08:44 PM
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Joined: Nov 2004
Posts: 2,825 Sk. Canada
RemCharger
master
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master
Joined: Nov 2004
Posts: 2,825
Sk. Canada
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Quote:
Not to hijack this thread, but I plan to do something simaler, I'm trying to do 400 HP with a stock '70 roadrunner 383. It already has a 440 cam and 9.5:1 compression. It has the CH4B (I think) Aluminum Edelbrock intake from 1969. I have aquired a Holley 670 Street Avenger. I'm pretty sure that the 1.75" headers are the thing I need for the exhaust with 2.5" exhaust pipes. Does this sound like the right recipe? I'm trying not to mod the internals, it's a recent rebuild. Any suggestions on the header brand?
I would use (and do) the 1 7/8 hookers. The cam is small if its the chrysler cam. there were two... small and smaller. But if you already have everything, they will work well as a mild combo. You can easily change cam/carb/intake down the road.
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Re: Need ideas for a 450HP build on my 383/ street motor?
[Re: njdevil2]
#975496
04/18/11 08:53 PM
04/18/11 08:53 PM
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Joined: Jan 2003
Posts: 74,979 U.S.S.A.
JohnRR
I Win
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I Win
Joined: Jan 2003
Posts: 74,979
U.S.S.A.
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Quote:
Not to hijack this thread, but I plan to do something simaler, I'm trying to do 400 HP with a stock '70 roadrunner 383. It already has a 440 cam and 9.5:1 compression. It has the CH4B (I think) Aluminum Edelbrock intake from 1969. I have aquired a Holley 670 Street Avenger. I'm pretty sure that the 1.75" headers are the thing I need for the exhaust with 2.5" exhaust pipes. Does this sound like the right recipe? I'm trying not to mod the internals, it's a recent rebuild. Any suggestions on the header brand?
Intake would be the DP4B , CH4b is the 440 intake .
Who rebuilt it, what pistons are in it? Many people THINK they are building 9.5 or 10.0 compression 383 with the currently available pistons but unless they zero deck the block and cut the heads down to at least 82ish cc then it's not really that high ... or use the KB 400 DOME piston. The stock 68/69 383 HP has 9.3 compression at best, how anyone thinks they are building a 9.5 or 10.0 engine with a piston that is .024 or more in the hole without zero decking AND use a composite head gasket that almost twice as thick ass the original is beyond me.
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Re: Need ideas for a 450HP build on my 383/ street motor?
[Re: 2264PLY]
#975498
04/19/11 02:13 AM
04/19/11 02:13 AM
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Joined: Jan 2003
Posts: 9,857 Cambridge Idaho
RUMBLON
OP
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OP
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Joined: Jan 2003
Posts: 9,857
Cambridge Idaho
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Quote:
Does it have to be 383? A 440 would get you there so much easier.
I am currently out of 440s, except the finished solid lifter done 500 stroker I have sitting in the shop, that was originally for a drag car that I wont be using now.
My engine builder believes that its best to use that motor for what it was intended to be for or sell it or trade it for a done motor for this car.
So I was hoping to build the 383 that I have. But This is why I am posting the thread. To weigh out my options.
RUMBLON
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