rhs heads or phase 3 heads? - 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 11-04-2008, 07:54 PM
Registered User
 
Join Date: Nov 2008
Location: Eastern Shore, Md
Posts: 3
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
rhs heads or phase 3 heads?

I want to rebuild my 350 using vortec heads, but i'm stuck on which heads to use. Should I go with the rhs pro torker vortecs 12410. Or the gm phase 3 12480034. I'm planing on running a stock bottom end, probably 9.5 to 1 cr. pistons, and just use a speed pro rebuild kit. Its a 4 bolt main. Bored .30 over. The engine has about 20,000 miles on it. But uses a quart of oil every week. I assume the rings not installed right or something. I would like to get at least 400hp+ out of this motor. Its in a 87 El Camino. I'm running a 2500 stall converter, th350 trany, and 3:73 gears. Which set of heads flow better, and make more power? Also what camshaft should I go with. I want that lumpy sound but, honestly i don't want to sacrifice performance for sound. This car will be drivin a few times a week. And to cruise ins.



Dom

    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 11-05-2008, 01:39 AM
techinspector1's Avatar
Senior Curmudgeon
 
Last wiki edit: DynoSim combinations Last photo:
Join Date: Oct 2005
Location: Hemet, California, USA
Age: 72
Posts: 13,334
Wiki Edits: 326

Thanks: 844
Thanked 1,163 Times in 959 Posts
I have no respect for companies that mislead buyers. Therefore, I have no respect for RHS and would never do business with them. I had never paid any attention to their products until I just went on their site to look up the flow data on their heads. On there, the flow data for a small block Chevy 180 head is given and it looks impressive. Then I looked at the footnote........

"Flow data was obtained using a Superflow SF600 and 4.200" bore. Smaller or larger bore diameters will yield different flow results".

Well, no crap Sherlock. And each and every one of us Chevy guys uses a 4.200" bore, so no problem, huh??????

I wouldn't buy 'em now if they were a hundred bucks a pair.

I can't even put 'em on my software to check out the hp/torque results on different motors because nobody uses a 4.200" bore on a small block, so the results would be skewed anyway. Waste of time.

I can't find any flow figures on the GM head, although it is stated that the flow exceeds any other production cast iron head. That tells me they flow better than the 12558060 heads and up until now, they have been the daddy of cast iron production heads. I know you can make 425 hp on a 350 with the 060 heads, so it shouldn't be a problem with the 034 heads.

If I could find flow figures, I'd build it on my software and dial in everything for you.
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 11-05-2008, 03:29 AM
SSedan64's Avatar
Registered User
 
Last photo:
Join Date: Dec 2007
Location: Macon, GA.
Age: 50
Posts: 6,016
Wiki Edits: 0

Thanks: 0
Thanked 46 Times in 46 Posts
May find the flow data here. Saw the RHS torker & GM Phase 2, but not 3.
Hopefully it's not copied from RHS site.
http://users.erols.com/srweiss/tablehdc.htm#Chevy
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 11-05-2008, 06:49 AM
TorkMonster400's Avatar
uninteresting default message
 
Last wiki edit: Working with chromed bolts
Last journal entry: A couple of pics of the car
Last photo:
Join Date: Mar 2008
Location: Fort Walton Beach Fl
Posts: 236
Wiki Edits: 4

Thanks: 0
Thanked 0 Times in 0 Posts
Great site for info thanks
Reply With Quote Quick reply to this message
  #5 (permalink)  
Old 11-05-2008, 08:53 AM
Registered User
 
Join Date: Nov 2008
Location: Eastern Shore, Md
Posts: 3
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
so if I go with the 12558060 heads what cam do you think I should go with?
Reply With Quote Quick reply to this message
  #6 (permalink)  
Old 11-05-2008, 10:27 AM
Registered User
 
Join Date: Oct 2008
Location: Dasyton, Ohio
Posts: 13
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
What heads to use.

First thing, check with the manufacturer as to what springs are used and max. lift. This usually narrows your cam choices.

peace Bud
Reply With Quote Quick reply to this message
  #7 (permalink)  
Old 11-05-2008, 02:28 PM
techinspector1's Avatar
Senior Curmudgeon
 
Last wiki edit: DynoSim combinations Last photo:
Join Date: Oct 2005
Location: Hemet, California, USA
Age: 72
Posts: 13,334
Wiki Edits: 326

Thanks: 844
Thanked 1,163 Times in 959 Posts
Start with a roller tappet block. Two fellows on this board have bought roller blocks in the past week, one for $100 and the other for $75, so it makes no sense to start with a flat tappet block. GM roller lifters, dog bones and spider can be had on ebay.

12558060's that have been modified for 0.600" lift can be had from Scoggin-Dickey, part #SD8060RAGP2, $429.95 each, machined for screw-in studs and guide plates (studs and plates not included).
www.sdparts.com
Here are the studs....
http://store.summitracing.com/partde...5&autoview=sku
And here are the guide plates....
http://store.summitracing.com/partde...1&autoview=sku

Pick up 20 hp with roller rockers. Fellows on this board have had good things to say about Scorpion and the price is right...
You can get them at many different places. Here is the SCP1000 at Flatlanders for $207...
http://www.flatlanderracing.com/scor...s.html#chevySB
Bore the block 0.030" and use this piston with 5.7" rods. Will make 9.60:1 SCR with 64cc heads....
http://kb-silvolite.com/performance....tails&P_id=155

Gap the top rings at 0.026" and second rings at 0.018".

Cut the block decks for 0.015" piston deck height and use these 0.025" head gaskets for a squish of 0.040"....
http://www.cnc-motorsports.com/produ...08&CtgID=16808

Use an Edelbrock Vortec RPM intake (Scoggin-Dickey #E7116 for $169.95 or Vortec RPM Air Gap #E7516 for $223.95) with the 750 vacuum secondary carb of your choice. Bolt on some 1 3/4" equal length headers.

Bolt in a CompCams roller, part #08-432-8, grind #XR282HR (282/288, 230/236, 0.510"/0.520", 110 LSA. Retard 2 degrees. Lobe lift at the cam (0.340"/0.347") is about all I would want to use with the stock GM rollers to prevent popping them out of their bore too far. Of course, you could use higher ratio rockers if you wanted to. 1.6 rockers on both sides would yield 0.544"/0.555". Co-ordinate between Scoggin-Dickey and CompCams to insure that you use the proper valve springs for this cam.

This combo will make 450 hp @5500 and 460 ft/lbs @ 4500 with 1.5 rockers according to my DynoSim. 1.6 rockers would add another 10 hp and 10 ft/lbs.

Your 2500 stall converter should be a good match for this cam.

Scoggin-Dickey also has #FEL 1255 intake gaskets for $21.95/pair, #SD12550027 12-point intake bolts for $14.95 and #10046089 valve cover gaskets for $25.67. These heads take center bolt valve covers, so the choice there is up to you. Here are the centerbolt offerings from Summit....
http://store.summitracing.com/egnsea...=KeywordSearch

Last edited by techinspector1; 11-05-2008 at 03:26 PM.
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:
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
vortec vs phase 2 heads 71vegagt Engine 3 01-29-2006 06:12 AM
sbc heads shieldbreaker Engine 5 08-27-2005 09:12 PM
Heads and Intake combo black66 Engine 4 07-24-2005 12:33 AM
Bow Tie heads 2wld4u Engine 11 07-24-2004 08:34 PM
looking for some head(s) now i'm gonna explode! bullheimer General Rodding Tech 25 04-12-2004 02:16 PM


All times are GMT -6. The time now is 10:58 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.