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Re: Help me with 383 upgrade!
[Re: gch]
#210617
02/14/09 11:15 PM
02/14/09 11:15 PM
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Joined: Aug 2003
Posts: 8,716
Baltimore/Denver
64Post
master
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master
Joined: Aug 2003
Posts: 8,716
Baltimore/Denver
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Can 400HP get done on $3500?  I've got a LOT more than that in my 383. Granted, it's a stroker with all new parts though. I can see an easy $1K in machine work alone before working on the heads...
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Re: Help me with 383 upgrade!
[Re: 70Cuda383]
#210618
02/14/09 11:22 PM
02/14/09 11:22 PM
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Joined: Aug 2003
Posts: 8,716
Baltimore/Denver
64Post
master
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master
Joined: Aug 2003
Posts: 8,716
Baltimore/Denver
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Quote:
here's my build...
383, 440 stroker kit, 438 cu. in.
eddy RPM heads--84cc chambers, OOTB
zero deck flat top pistons with valve reliefs
10.5:1 compression
comp XE275HL cam
RPM intake
1 7/8 headers
holley 750HP
made 505 hp on the dyno, tons of bottom end. over 500 ft lbs torque from 3000 rpm through 5800 rpm
with stock 906 heads reconditioned to like new, all else being the same, it was about 9.5 compression, and maybe only about 450 hp, due to the lower compression AND lower airflow of the heads
I'm trying to guess my HP. Do you remember off the top of your head what your cam specs are? Solid or hyd? Our combos are similar, but I went a little over/more/bigger on everything.
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Re: Help me with 383 upgrade!
[Re: cdp]
#210620
02/15/09 09:19 AM
02/15/09 09:19 AM
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Joined: Jan 2003
Posts: 75,060
U.S.S.A.
JohnRR
I Win
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I Win
Joined: Jan 2003
Posts: 75,060
U.S.S.A.
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Quote:
https://board.moparts.org/ubbthreads/show...rue#Post4933738
Use eigher a KB162 piston or a 2316 Federal mogul/TRW to keep your compression height correct. Anything less than these are a waist of money and super-low compression. Even with these pistons and an 85CC or so head, your barely at 9:1.
Follow the link on a Purestock 383 thread.
NEITHER of these pistons will get you the CORRECT compression height , the KB162 is deeper in the hole than the 2315 AND it's got a CANYON LIKE valve relief at 5cc .
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Re: Help me with 383 upgrade!
[Re: JohnRR]
#210623
02/15/09 12:42 PM
02/15/09 12:42 PM
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Joined: Aug 2003
Posts: 8,716
Baltimore/Denver
64Post
master
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master
Joined: Aug 2003
Posts: 8,716
Baltimore/Denver
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Quote:
Quote:
Can 400HP get done on $3500?
I've got a LOT more than that in my 383. Granted, it's a stroker with all new parts though.
I can see an easy $1K in machine work alone before working on the heads...
I don't see why not on a 383 cube build , most of the money will be spent on cylinder head work . A closed chamber head with about 78cc of volume with a flat top at zero deck and maybe 3cc reliefs tops would get the compression where it needs to be . Run a performer RPM with a good 750-800 cfm carb and a decent header.
I guess it's going to depend on the quality of new parts used and the going rate for machine work in the area. I'm still skeptical, though. Plus, there's going to be another line item $500-600 for assembly labor.
Quote:
fast68plymouth got 500 HP out of a 383 with unported 906's and an umder .500 lift cam.
I'm still more than a little suspect of Dwayne's numbers. Look at 70 Cuda's combo compared to Dwayne's -- it has more of everything and makes only 5 HP more.
Mine ought to make 600HP, then...
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Re: Help me with 383 upgrade!
[Re: ireland383]
#210626
02/15/09 02:47 PM
02/15/09 02:47 PM
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Joined: Jul 2006
Posts: 4,319
Puyallup, WA
StealthWedge67
master
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master
Joined: Jul 2006
Posts: 4,319
Puyallup, WA
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As long as you don't plan on spraying any nitrous, I'd go with KB400 hyper pistons. They have a positive dome design, which should allow you to get nearly 10:1 with open chamber heads, if I remember correctly. A 383 with these pistons, some well prepped 452's or 906's and a camshaft in the 238* / .510 range would be my choice for a budget street / strip 383 build.
LemonWedge - Street heavy / Strip ready - 11.07 @ 120
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Re: Help me with 383 upgrade!
[Re: 64Post]
#210631
02/15/09 10:54 PM
02/15/09 10:54 PM
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Joined: Jan 2003
Posts: 75,060
U.S.S.A.
JohnRR
I Win
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I Win
Joined: Jan 2003
Posts: 75,060
U.S.S.A.
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Quote:
Quote:
fast68plymouth got 500 HP out of a 383 with unported 906's and an umder .500 lift cam.
I'm still more than a little suspect of Dwayne's numbers. Look at 70 Cuda's combo compared to Dwayne's -- it has more of everything and makes only 5 HP more.
Mine ought to make 600HP, then...
You can be skeptical all you want , the math doesn't lie , other members have had their engines run on the same dyno and the numbers have been correct also . Dwayne is NOT one to fib about what he does , his business DEPENDS on being truthful .
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Re: Help me with 383 upgrade!
[Re: JohnRR]
#210633
02/15/09 11:10 PM
02/15/09 11:10 PM
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Joined: Jun 2006
Posts: 5,163
CT
GTX MATT
master
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master
Joined: Jun 2006
Posts: 5,163
CT
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Dwayne had more cam and carb and compression
Now I need to pin those needles, got to feel that heat
Hear my motor screamin while I'm tearin up the street
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Re: Help me with 383 upgrade!
[Re: JohnRR]
#210634
02/15/09 11:23 PM
02/15/09 11:23 PM
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Joined: Feb 2003
Posts: 3,691
MO
cdp
master
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master
Joined: Feb 2003
Posts: 3,691
MO
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I think its around 2002-2003. About the same time Florida_70Bee's....Bee was featured in Mopar Muscle.
Here is his combination, and according to an online calculator, he's making around 325 at the rear wheels based on the weight and speed. Note that he runs aroudn 13.50 in the 1/4 with a PURESTOCK legal standard bore, #'s matching 383.
Getting 400-450 horse should be fairly easy.
==================================================
Purestock 383
"have done this same combo in my 70 Bee
To get the C.R. up you will need to deck the block and mill the heads and I think Speed Pro offers a correct flatop piston
Here are some specs on my combo
The block is the original std bore 383
I am using the original cast flatop pistons standard bore.
Speed pro plasma moly rings
The block has been decked to a piston to deck clearance of -.006. (NHRA stock elim minimum specs are -.004 (for a 70 383 335hp) in untouched form I measured the piston to deck at -.050
I am using a Fel Pro steel shim gasket for a 413 which has a compressed thickness of .020
The heads are stock unported 906's with stock size 2.08/1.74 valves with a good valve job. Additionally the heads have been milled to 80cc's (the NHRA minimum is 79.5cc's and in untouched form they were 88cc's)
All this adds up to a measured compression ratio of 10.12:1. This number would be higher with a .030 or .060 piston. Originally in untouched form I measured the CR at 8.44:1 (a far cry from it's 9.5:1 advertised CR.
The cam is a Mopar Performance stock resto cam for a 440 6 pack (same dimensions as the original 383 magnum cam except it uses a 3 bolt cam gear instead of the original 1 bolt)
The intake is the unported original.
The carb is the original 585 cfm holley
The converter is a dynamic 11 inch that stalls at 2300 (like the original converter
The ignition is a combination of Mopar Performance elctronic and FBO Ignition Box, and Coil
The exhaust is a TTI 2 1/2 H pipe with Dynomax Ultra Flow Mufflers
I am running a 4.10's in the rear and I am using a pinion snubber and I clamp the front segment of the original springs.
The car weighs between 3975 and 4015 lbs with me in it depending on the fuel load. I leave the line at around 2000 rpms and roll into the throttle (I don't stab it at green as I am running F70-14 Polyglas's) and shift between 5600 & 5700 and it goes through the traps at 5600 rpms. "
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So John, are you saying they didn't make the 450 like they claim in the Moparmuscle/Westech article? I was unaware of this if thats the case.
Last edited by cdp; 02/15/09 11:26 PM.
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