Right cam for a 383? - Hot Rod Forum : Hotrodders Bulletin Board
Hotrodders.com -- Hot Rod Forum



Register FAQ Search Today's Posts Unanswered Posts Auto Escrow Insurance Auto Loans
Hot Rod Forum : Hotrodders Bulletin Board > Tech Help> Engine
User Name
Password
lost password?   |   register now

Reply
 
LinkBack Thread Tools
  #1 (permalink)  
Old 10-29-2009, 12:27 PM
Registered User
 
Join Date: Oct 2009
Location: Chanhassen, MN
Posts: 12
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Right cam for a 383?

I'm trying to figure out what cam I should use for my 383 build. I'm aiming for at least 400hp & 400 ft pounds of torque (preferably with great throttle response and acceleration)

My current parts and specs are as follows:

Compression Ratio is 10.27 : 1

Edelbrock Performer RPM Vortec intake manifold.

64 cc Vortec heads w/ beehive springs

1.6 rocker arm ratio

Rotating assembly:
Eagle Nodular Cast Iron 383 Stroker Crankshaft
6 inch rods
-12cc speed pro pistons

Engine block is a 1991 small block 350 bored .030 over

    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 10-29-2009, 01:02 PM
How fast is fast enough?
 
Last photo:
Join Date: Jun 2005
Location: St. Louis, MO
Age: 29
Posts: 8,678
Wiki Edits: 0

Thanks: 17
Thanked 281 Times in 261 Posts
Do you want maximum power or good durability? Solid or hydraulic? roller or flat?
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 10-29-2009, 01:31 PM
Registered User
 
Join Date: Oct 2009
Location: Chanhassen, MN
Posts: 12
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Both power and durability. However, I'm leaning more toward power. I'm willing to use whatever will get the job done.
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 10-29-2009, 01:36 PM
How fast is fast enough?
 
Last photo:
Join Date: Jun 2005
Location: St. Louis, MO
Age: 29
Posts: 8,678
Wiki Edits: 0

Thanks: 17
Thanked 281 Times in 261 Posts
okay, go for a solid roller with about 250/256 duration and around .600" lift, on a 108 LSA, installed on a 102 ICL. Should get you plenty of power, the rest of the combo (and the cost) well need to be built up as well. It shoudl run power brakes fairly well though if you use a big canister.
Reply With Quote Quick reply to this message
  #5 (permalink)  
Old 10-29-2009, 09:00 PM
Registered User
 
Join Date: Oct 2009
Location: Chanhassen, MN
Posts: 12
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
what about for hydraulic flat tappet?
Reply With Quote Quick reply to this message
  #6 (permalink)  
Old 10-30-2009, 12:37 AM
Registered User
 
Last photo:
Join Date: Nov 2003
Location: oklahoma
Age: 32
Posts: 250
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
what is the max lift on your vortec heads? .480, .550
Reply With Quote Quick reply to this message
  #7 (permalink)  
Old 10-30-2009, 01:11 AM
Registered User
 
Join Date: Oct 2009
Location: mass
Posts: 26
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
ap72are you over the edge-vortecs hit a wall at apx 500 lift.
Reply With Quote Quick reply to this message
  #8 (permalink)  
Old 10-30-2009, 01:33 AM
Registered User
 
Join Date: Oct 2009
Location: mass
Posts: 26
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
atomiccrc-look at lunati 60103 if you entertain comp xe274h the one that everyone laughed at was a little vega wagon with a x4270h until the end
Reply With Quote Quick reply to this message
  #9 (permalink)  
Old 10-30-2009, 01:38 AM
Registered User
 
Join Date: Oct 2009
Location: mass
Posts: 26
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Torque and good gas goes a long way!
Reply With Quote Quick reply to this message
  #10 (permalink)  
Old 10-30-2009, 06:15 AM
How fast is fast enough?
 
Last photo:
Join Date: Jun 2005
Location: St. Louis, MO
Age: 29
Posts: 8,678
Wiki Edits: 0

Thanks: 17
Thanked 281 Times in 261 Posts
Quote:
Originally Posted by 83montess
ap72are you over the edge-vortecs hit a wall at apx 500 lift.

with a little SSR and bowl work you can get it over .550", and I do mean very little, like 30 minutes a port. Also, in MANY cases a cam goes a little past the stall point to get max power.
Reply With Quote Quick reply to this message
  #11 (permalink)  
Old 10-30-2009, 08:44 AM
Member
 
Last photo:
Join Date: Dec 2004
Location: San Antonio, Texas
Age: 50
Posts: 4,021
Wiki Edits: 0

Thanks: 0
Thanked 23 Times in 23 Posts
10.27:1 cr with vortec heads will need a cam with around 280 degrees (seat to seat) to run pump gas.

then vortecs flow poorly on the exhaust so use 10 more degrees on the exhaust duration as compared to the intake.

No real need to lift past 0.500" with vortec heads. Make sure the heads can handle 0.500" lift plus 0.050" for extra clearance.

so, look for a cam with 280 on the intake , 290 on the exhaust, 0.480 to 0.500" lift with 108 to 112 lobe separation angle (lsa). Use higher lsa for a smoother idle and more top end power. And lower lsa for more mid range torque and a rougher idle. This cam should have 230 to 240 degrees duration at 0.050".

make sure to use zddp oil additive with your new cam. use at break in and at each oil change if you want your cam to live a long life. www.zddpluss.com. get a case.

finally this compression and cam setup will need a 3.55 to 3.73 gear with a 2500 to 2800 stall converter.
Reply With Quote Quick reply to this message
  #12 (permalink)  
Old 10-30-2009, 11:01 AM
Registered User
 
Join Date: Oct 2009
Location: Chanhassen, MN
Posts: 12
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
W/ the beehive springs the max lift is 500-550 or so I've been told.
(Lol thank god I have a spare 2500 stall torque converter in storage. Didn't know if I'd ever get to use it haha....)

Now would this give me good low to mid end torque plus throttle response throughout the power band? What RPM range are we talking here? Im preferring that this thing operate in the 1500-6500 range.

Last edited by atomicrockerdude; 10-30-2009 at 11:12 AM.
Reply With Quote Quick reply to this message
  #13 (permalink)  
Old 10-30-2009, 11:08 AM
V8 Super Beetle's Avatar
VW makes it, Chevy shakes it..
 
Last photo:
Join Date: Jan 2008
Location: Houston, TX
Age: 33
Posts: 1,245
Wiki Edits: 0

Thanks: 5
Thanked 0 Times in 0 Posts
Quote:
Originally Posted by 454C10
10.27:1 cr with vortec heads will need a cam with around 280 degrees (seat to seat) to run pump gas.

then vortecs flow poorly on the exhaust so use 10 more degrees on the exhaust duration as compared to the intake.

No real need to lift past 0.500" with vortec heads. Make sure the heads can handle 0.500" lift plus 0.050" for extra clearance.

so, look for a cam with 280 on the intake , 290 on the exhaust, 0.480 to 0.500" lift with 108 to 112 lobe separation angle (lsa). Use higher lsa for a smoother idle and more top end power. And lower lsa for more mid range torque and a rougher idle. This cam should have 230 to 240 degrees duration at 0.050".

make sure to use zddp oil additive with your new cam. use at break in and at each oil change if you want your cam to live a long life. www.zddpluss.com. get a case.

finally this compression and cam setup will need a 3.55 to 3.73 gear with a 2500 to 2800 stall converter.
I agree.
Reply With Quote Quick reply to this message
  #14 (permalink)  
Old 10-30-2009, 11:31 AM
Registered User
 
Join Date: Oct 2009
Location: Chanhassen, MN
Posts: 12
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Is there a mathematical formula you guys use when figuring all this out or do you just have a feel from working with engines?

Also are there any cams off the top of your head that would match 454C10's description? It would certainly help cut down the searching time on my end.

Last edited by atomicrockerdude; 10-30-2009 at 11:42 AM.
Reply With Quote Quick reply to this message
  #15 (permalink)  
Old 10-30-2009, 01:06 PM
How fast is fast enough?
 
Last photo:
Join Date: Jun 2005
Location: St. Louis, MO
Age: 29
Posts: 8,678
Wiki Edits: 0

Thanks: 17
Thanked 281 Times in 261 Posts
If you want a killer street 383 this cam will work GREAT for your application. Isky 201281-6.

280/280
232/232
.485/.485 lift with 1.5 rockers
106 LSA, install it on a 102 ICL.

This would be a killer street cam for combo. I'd run it with 1.6 rockers to get your lift up a little. more exhaust duration would give you a few more top end hp, a street car would run slower. So you can have a few more ponies, or have a little quicker car- your choice.
Reply With Quote Quick reply to this message

Recent Engine posts with photos

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Hot Rod Forum : Hotrodders Bulletin Board forums, you must first register.
Please enter your desired user name (usually not your first and last name), your email address and other required details in the form below.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

Posting Rules
You may post new threads
You may 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
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
383 cam question... ourmartyr Engine 9 01-16-2008 03:58 PM
383 cam choice HSR383TPI Engine 13 11-10-2007 09:11 AM
383 cam swap ? 383silverado Engine 2 07-28-2007 09:52 AM
383 Rod & Cam clearance crusherdbuzz Engine 9 11-12-2006 06:17 PM
Mildly Built 383... Cam Suggestions? Dizturbed One Engine 12 11-03-2004 03:29 PM


All times are GMT -6. The time now is 10:34 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0 PL2
Copyright Hotrodders.com 1999 - 2012. All Rights Reserved.