sbc 383 combo - Yellow Bullet Forums

Go Back   Yellow Bullet Forums > Technical Section > Naturally Aspirated - Uratchko Racing Engines

Naturally Aspirated - Uratchko Racing Engines

Reply
 
Thread Tools Display Modes
Old 06-22-2012, 08:28 PM   #1
Daviskeenracing
Junior Member
Spooled up
 
Daviskeenracing's Avatar
 
Join Date: Jun 2012
Posts: 120
Default sbc 383 combo

Hey guys im new to this forum not sure how to start out my question. I just put a 383 together and just wanted to have it looked at so here it is. stk 350 4 bolt main .030 over scat 4340 3.75 crank scat 4340 6in stroker rods Icon Ic733 .163 dome forged pistons zero deck, felpro1003 head gasket cam specs @.50 280I 276E lift 675I 620E Advertised dur 320I 318E Installed 104 heads are Afr 210 race flat milled to 60cc afr 8000 springs holley strip dom intake gasket matched mighty demon 850 carb 85 prim 93 sec timing locked at 38 1 3/4 to 1 7/8 stepped headers Th400 with break 5500stall converter 4.88gears 31 tall tire 3000lbs 69 camaro I have only had the car out once this year went 6.89 at 100.76 mpg with 1.50 60ft this thing fell over at 6500 rpm i was planning on shifting at 7500 im not sure if its the carb or valve springs or what i was hoping for mid to low 6sec I think the cam is alittle on the big side Any info would be great thanks
Daviskeenracing is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 06-22-2012, 08:40 PM   #2
69chicken
Senior Member
Smoked Another SBC
 
69chicken's Avatar
 
Join Date: Jun 2007
Location: Stl. MO
Posts: 4,687
Default Re: sbc 383 combo

Springs and junk!
69chicken is offline   Reply With Quote
Old 06-22-2012, 08:49 PM   #3
Hotrod 36
Member
Pullin gears
 
Hotrod 36's Avatar
 
Join Date: Jan 2010
Location: NY
Posts: 752
Default Re: sbc 383 combo

Why did you chose more duration on the intake side than the exhaust? Does it fall over at 6500 in each gear? Asking because you could be running out of fuel if its first gear only.
Hotrod 36 is offline   Reply With Quote
Old 06-22-2012, 09:15 PM   #4
Daviskeenracing
Junior Member
Spooled up
 
Daviskeenracing's Avatar
 
Join Date: Jun 2012
Posts: 120
Default Re: sbc 383 combo

Well i bought the cam used and it was in the wrong box i did not know that till i ran the grind number on the cam so i just went with it. And it seems like just in first gear when i hit second its like i hit a n2o button it well just pin ya in the seat im running the holley hp 150 pump at 6psi.
Daviskeenracing is offline   Reply With Quote
Old 06-22-2012, 09:16 PM   #5
Daviskeenracing
Junior Member
Spooled up
 
Daviskeenracing's Avatar
 
Join Date: Jun 2012
Posts: 120
Default Re: sbc 383 combo

And to 69chicken my springs are junk or my whole combo?
Daviskeenracing is offline   Reply With Quote
Old 06-22-2012, 09:28 PM   #6
RCM Racing engines
Senior Member
Smoked another BBC
 
RCM Racing engines's Avatar
 
Join Date: Jun 2010
Location: Pa
Posts: 3,917
Default Re: sbc 383 combo

don't know those spring specs off hand, But it is totally the wrong cam,.....duration backwards and way to much duration......

Heck my 412 cui sbc with afr 235's has less, By about 15* on the intake....and your same exhaust........

Needs around a 262int and 270 exhaust on a 110 lsa with a 106 int c/l, lift is good or go more...............

put around 250 on the seat and 625 over the nose and let it eat..................
__________________
An intellectual solves problems, A Genius prevents them..............
RCM Racing engines is offline   Reply With Quote
Old 06-22-2012, 09:44 PM   #7
Daviskeenracing
Junior Member
Spooled up
 
Daviskeenracing's Avatar
 
Join Date: Jun 2012
Posts: 120
Default Re: sbc 383 combo

I had a feeling someone was going to say that .
Daviskeenracing is offline   Reply With Quote
Old 06-22-2012, 09:48 PM   #8
RCM Racing engines
Senior Member
Smoked another BBC
 
RCM Racing engines's Avatar
 
Join Date: Jun 2010
Location: Pa
Posts: 3,917
Default Re: sbc 383 combo

Quote:
Originally Posted by Daviskeenracing View Post
I had a feeling someone was going to say that .
SORRY............................................. ..
__________________
An intellectual solves problems, A Genius prevents them..............
RCM Racing engines is offline   Reply With Quote
Old 06-22-2012, 10:03 PM   #9
Daviskeenracing
Junior Member
Spooled up
 
Daviskeenracing's Avatar
 
Join Date: Jun 2012
Posts: 120
Default Re: sbc 383 combo

Is it the cams fault for short shifting like that? And can u regrind a cam smaller only reason i ask cause i ask the fellow i got the cam off of about the grind number not matching the box and he said that cam was in the box from jegs. I couldnt even fine tne grind number on cranes web site i had to call them.
Daviskeenracing is offline   Reply With Quote
Old 06-22-2012, 10:10 PM   #10
69chicken
Senior Member
Smoked Another SBC
 
69chicken's Avatar
 
Join Date: Jun 2007
Location: Stl. MO
Posts: 4,687
Default Re: sbc 383 combo

Yes springs are junk. (Sorry on my phone with fat fingers) Rest looks fine to me to start with. Not sure it will go low 6s but it might.
69chicken is offline   Reply With Quote
Old 06-22-2012, 10:17 PM   #11
Daviskeenracing
Junior Member
Spooled up
 
Daviskeenracing's Avatar
 
Join Date: Jun 2012
Posts: 120
Default Re: sbc 383 combo

Well im not sure where to start now cam or springs? not haveing much tune time on it doest help i know i went up 2 jet sizes and picked up 3 tenths a 2mph then ran out of time.
Daviskeenracing is offline   Reply With Quote
Old 06-22-2012, 10:31 PM   #12
69RS
Senior Member
Smoked another BBC
 
69RS's Avatar
 
Join Date: Jun 2009
Location: Central Louisiana
Posts: 1,347
Default Re: sbc 383 combo

Quote:
Originally Posted by Daviskeenracing View Post
Well im not sure where to start now cam or springs? not haveing much tune time on it doest help i know i went up 2 jet sizes and picked up 3 tenths a 2mph then ran out of time.
^^^^ Both if any way possible ^^^^
__________________

NA 540 BBC Dart CNC-355's 8:90 @ 151
1250 Dominator on M5
3130 lbs. w/driver
69RS is offline   Reply With Quote
Old 06-22-2012, 10:37 PM   #13
Daviskeenracing
Junior Member
Spooled up
 
Daviskeenracing's Avatar
 
Join Date: Jun 2012
Posts: 120
Default Re: sbc 383 combo

well i guess ill be on the hunt for another cam. I have one but its on the small side its 242i 250e @50 580 600 lift it cam out of my 350
Daviskeenracing is offline   Reply With Quote
Old 06-23-2012, 12:57 AM   #14
Kaotic
Junior Member
Spooled up
 
Join Date: Jul 2011
Posts: 125
Default Re: sbc 383 combo

From my spring research a while back, I'm pretty sure the afr 8000 spring is the upgrade on the head and is mfg. by PAC for afr and is a PAC-1225 spring,

if so that is a great spring, specs out of my book are 250 on the seat, 765 open, max lift .800
__________________
(under construction for more parts)
Kaotic is offline   Reply With Quote
Old 06-23-2012, 01:14 AM   #15
Kaotic
Junior Member
Spooled up
 
Join Date: Jul 2011
Posts: 125
Default Re: sbc 383 combo

never mind my info, looks like the 8000 spring is the standard one that comes with the head, 225 on seat and .710 max lift
__________________
(under construction for more parts)
Kaotic is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -4. The time now is 12:16 AM.


Powered by vBulletin® Version 3.8.6
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Garage Plus vBulletin Plugins by Drive Thru Online, Inc.
Resources saved on this page: MySQL 2.99%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Yellow Bullet LLC