Opinions about this camshaft for my application - 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 12-19-2011, 05:35 PM
TooSlow's Avatar
Beater Driver
 
Last photo:
Join Date: Jun 2004
Location: Davenport, Iowa
Posts: 50
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Opinions about this camshaft for my application

Hi all,

I just bought an '89 Camaro, currently powered by a 305 tbi engine. It has a 700R4 transmission and 2.73 rear gears. Through a trade I also acquired a 350 Target Master engine that I plan to put into the Camaro. First I would like to put a warmer cam into it to wake things up. I found a gentleman offering this new cam and lifters for sale for $50:

Lunati
Advertised Duration : 250/256
Duration @ .050 IN/EX : 207/213
Gross Valve lift IN/EX .437''/.454''
RPM Range: Idle-5000

It's a small cam, but with my gears and otherwise stock engine I thought it might be a good fit. My goal is to try to run some mid 14 second quarter mile times next summer with a minimal cash outlay. I also plan to put full length headers on the car, and I will be putting it on a diet--I hope to have it around 3400-3500 pounds with me in it. I'm afraid that this looks more like a low 15 second car with this recipe, but I wanted to know what others are thinking. Any ideas would be appreciated.
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 12-19-2011, 06:23 PM
TooSlow's Avatar
Beater Driver
 
Last photo:
Join Date: Jun 2004
Location: Davenport, Iowa
Posts: 50
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
After re-reading my post I wanted to clarify--the new cam will be for the 350, not the 305. The 350 has 993 heads, stock cast iron 4-barrel intake and a Q-Jet carb. I believe the 350 to currently have the stock "929" Chevy cam in it.
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 12-19-2011, 06:32 PM
Groucho's Avatar
Registered User
 
Last photo:
Join Date: Dec 2011
Location: SoCal
Posts: 46
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
I think you're being very reasonable wanting a cam with some bottom end grunt to pull that weight/rear gear combo. All too many times people pick a cam that's too big in hopes for better results
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 12-19-2011, 06:44 PM
techinspector1's Avatar
Senior Curmudgeon
 
Last wiki edit: DynoSim combinations Last photo:
Join Date: Oct 2005
Location: Hemet, California, USA
Age: 72
Posts: 12,246
Wiki Edits: 326

Thanks: 602
Thanked 767 Times in 657 Posts
Depends on your static compression ratio. The 60100 cam closes the intake valve at 31.5 degrees ABDC @0.050" tappet lift. The KB calculator says that an 9.0:1 Static Compression Ratio will yield an 8.08:1 Dynamic Compression Ratio and that a 9.50:1 SCR will yield an 8.52:1 DCR. So, the SCR of your motor will determine if the cam will work or not. If the SCR is lower than 9.00, then the motor may be weak. If the SCR is higher than 9.50, the motor could detonate on low octane pump fuel, depending on several other factors.
Reply With Quote Quick reply to this message
  #5 (permalink)  
Old 12-19-2011, 06:55 PM
TooSlow's Avatar
Beater Driver
 
Last photo:
Join Date: Jun 2004
Location: Davenport, Iowa
Posts: 50
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Thanks for the info, guys. I suspect that the engine is in the neighborhood of 8.5:1 static compression ratio, but I don't know for sure. I've been doing some reading on head porting and thought I might try my hand at it (as a beginner I'll just remove casting flash and try to remove very little material), but pulling the heads will give me the opportunity to properly measure my CR.
Reply With Quote Quick reply to this message
  #6 (permalink)  
Old 12-19-2011, 07:09 PM
techinspector1's Avatar
Senior Curmudgeon
 
Last wiki edit: DynoSim combinations Last photo:
Join Date: Oct 2005
Location: Hemet, California, USA
Age: 72
Posts: 12,246
Wiki Edits: 326

Thanks: 602
Thanked 767 Times in 657 Posts
Quote:
Originally Posted by TooSlow
Thanks for the info, guys. I suspect that the engine is in the neighborhood of 8.5:1 static compression ratio, but I don't know for sure. I've been doing some reading on head porting and thought I might try my hand at it (as a beginner I'll just remove casting flash and try to remove very little material), but pulling the heads will give me the opportunity to properly measure my CR.
I consider setting the squish equally as important as matching the cam to the SCR, so measure the gasket thickness and the piston deck height while you have it apart. For max detonation resistance, set the squish at between 0.035" and 0.045".
Reply With Quote Quick reply to this message
  #7 (permalink)  
Old 12-19-2011, 08:43 PM
F-BIRD'88's Avatar
Yada Yada Yada
 
Last photo:
Join Date: Oct 2005
Location: Ontario, Canada
Posts: 9,182
Wiki Edits: 0

Thanks: 2
Thanked 292 Times in 289 Posts
you need rpm and compression to take advantage of the cam in the 350.

Get some 4.10's from a 4 cyl S10 and put the 305 heads on the 350.
Reply With Quote Quick reply to this message
  #8 (permalink)  
Old 12-20-2011, 04:51 AM
TooSlow's Avatar
Beater Driver
 
Last photo:
Join Date: Jun 2004
Location: Davenport, Iowa
Posts: 50
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Techinspector, thanks for the quench info. I'll plan to check that as well while I have the heads off.

F-BIRD'88, are the 4.10 ring and pinion from an S-10 a direct swap into the Camaro rear? Regarding the heads, I have always heard that 305 heads flow much more poorly than even smog era 350 heads. Is this not the case, or do you think that the increase in compression from the small 305 chambers will make up for some loss of flow?

Thanks for your replies and assistance, guys!
Reply With Quote Quick reply to this message
  #9 (permalink)  
Old 12-20-2011, 02:31 PM
F-BIRD'88's Avatar
Yada Yada Yada
 
Last photo:
Join Date: Oct 2005
Location: Ontario, Canada
Posts: 9,182
Wiki Edits: 0

Thanks: 2
Thanked 292 Times in 289 Posts
Quote:
Originally Posted by TooSlow
Techinspector, thanks for the quench info. I'll plan to check that as well while I have the heads off.

F-BIRD'88, are the 4.10 ring and pinion from an S-10 a direct swap into the Camaro rear? Regarding the heads, I have always heard that 305 heads flow much more poorly than even smog era 350 heads. Is this not the case, or do you think that the increase in compression from the small 305 chambers will make up for some loss of flow?

Thanks for your replies and assistance, guys!
the s-10 4.10's are a bolt in when replaceing 3.23 or higher ratio.

when replacing 2.73's get a

"3 series posi" I recomend the Auburn Gear street posi diff, or the Eaton "posi diff for your car.

The 4.10's from a 4 cyl S10 7.5" rear are high quality GM gears and rarely worn.

the good 305 HO heads (#4416) flow about the same as the crappy 350 smoggers, 993 882-624 etc in stock form.

You can make them even better (more flow) by home porting them, then installing them. more flow ='s more go.

best with a larger 1.94" intake valve installed too.

Search my posts on the subject. More flow + more compression+ new cam on the 350 with a ported 305HO head swap ='s way more power
and a whole lot of fun w 4.10's.

now OD will actually be use full Net 2.87:1 cruise gear ratio in OD

Consider the camshaft the "conductor" of the orchestra (your car engine combo) It don;t matter how the conductor waves his arms around (camshaft)
if the orchestra does not know the tune.

The casting number of your 305 heads can be found under the valve cover.

Start with that.

Last edited by F-BIRD'88; 12-20-2011 at 02:37 PM.
Reply With Quote Quick reply to this message
  #10 (permalink)  
Old 12-20-2011, 05:11 PM
TooSlow's Avatar
Beater Driver
 
Last photo:
Join Date: Jun 2004
Location: Davenport, Iowa
Posts: 50
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Hey F-BIRD, that's great info, thanks. I like the comparison between the cam and a conductor... Think I'll work on getting a deep gear into the car first; I'll leave the 305 tbi engine alone until the gears are ready to roll and then work on the 350 engine swap.

Thanks again for all of the replies and assistance.
Reply With Quote Quick reply to this message
  #11 (permalink)  
Old 12-20-2011, 06:06 PM
Custom10's Avatar
my KARMA ran over my DOGMA
 

Last journal entry: SS
Last photo:
Join Date: May 2009
Location: Saskatchewan, Canada
Age: 49
Posts: 1,069
Wiki Edits: 0

Thanks: 10
Thanked 21 Times in 19 Posts
Quote:
Consider the camshaft the "conductor" of the orchestra (your car engine combo) It don;t matter how the conductor waves his arms around (camshaft)
if the orchestra does not know the tune.
I like that
Reply With Quote Quick reply to this message
  #12 (permalink)  
Old 12-20-2011, 07:27 PM
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
sounds like a good cam for low compression, stock stall, and a 2.73 gear.
Reply With Quote Quick reply to this message
  #13 (permalink)  
Old 12-22-2011, 01:19 PM
Registered User
 

Last journal entry: update
Last photo:
Join Date: Dec 2011
Location: over here
Posts: 216
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
That TBI 305 has the swirl-port heads that make good boat anchors, but nothing else. You want casting number '081 as your first choice. Mostly used on TPI 305s.
Forget the 4.10:1 ratio, because it's just too much with the 700R-4's 3.06:1 first gear. Look for 3.73:1 gears instead.
To get your piston-to-head clearance around 0.040"-0.045", you'll need the FelPro steel-shim head gaskets. It's worth getting right.
That small VooDoo cam kit for $50 is a good deal, and will be fun up to 5000 RPM.
Reply With Quote Quick reply to this message
  #14 (permalink)  
Old 12-22-2011, 03:58 PM
cool rockin daddy's Avatar
1.21 giga-watts???!!!!
 
Join Date: Aug 2003
Location: wherever cool cars are
Posts: 1,535
Wiki Edits: 0

Thanks: 0
Thanked 3 Times in 3 Posts
Too Slow,
Ever ported heads before? If not, forget the 305 heads. Would cost you $700 to have them ported to even come close to what stock Vortecs would give you power-wise. Many 350 head choices to go with over the 305 boat anchors. jmho
Reply With Quote Quick reply to this message
  #15 (permalink)  
Old 12-22-2011, 04:22 PM
Groucho's Avatar
Registered User
 
Last photo:
Join Date: Dec 2011
Location: SoCal
Posts: 46
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Isn't the 305 the one that had very small chamber heads? I remember a friend swapped 350 heads on one yrs ago and the 305 lost a lot of power. Later to find out that swap drastically killed the compression. If yes, be careful on head swapping
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
best sbc for 671 application vcb Engine 22 07-15-2011 05:21 AM
which trans for this application? leo4 Transmission - Rearend 3 05-09-2011 04:06 PM
header application #!new Engine 1 04-28-2010 11:05 PM
Opinions on correct PCV for my application y2k600f4 Engine 1 10-05-2009 09:33 AM
200-4R Application 123pugsy Transmission - Rearend 11 08-12-2009 02:21 PM


All times are GMT -6. The time now is 06:09 AM.


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.