got a pounding HEAD ache!!! - Page 2 - 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> Hotrodding Basics
User Name
Password
lost password?   |   register now

Reply
 
LinkBack Thread Tools
  #16 (permalink)  
Old 02-09-2013, 04:35 PM
Registered User
 
Join Date: Dec 2012
Posts: 76
Wiki Edits: 0

Thanks: 9
Thanked 8 Times in 8 Posts
You can get new vortec heads from Scoggin dicky chevrolet, already modified for the higher left etc. They deliver them right to your door and no need to involve a local shop. The vortecs are good for a basic build as they create low end torque for a street car. If you use old style sbc heads from the 1960's 9.5 :1 compression may detonate. With vortecs and the newer style chamber you can easily run 9.5 to 1 up to 10:1 without problems if you keep the engine cool with a good fan and radiator (180*) .

    Advertisement
Reply With Quote Quick reply to this message
The Following User Says Thank You to cadillacdave1 For This Useful Post:
maxxman04 (02-09-2013)
Sponsored Links
Advertisement
 
  #17 (permalink)  
Old 02-09-2013, 06:36 PM
Registered User
 
Join Date: Feb 2013
Location: southern Kentucky
Posts: 26
Wiki Edits: 0

Thanks: 19
Thanked 0 Times in 0 Posts
ok, so picked up the reworked 906's. 3 angle, .525" z28 springs, shaved ever so slightly, just to clean up. cc'd in at 63.8. yea, i always go prepared. only thing i'm not sure of is lock to guide clearance. from what i have read and heard i should be ok. but, i might just cut them down anyway, just to be sure.

e-tecs are out because of cost.
by researching, digging deep, and haggling, i've only got a little over a grand into motor so far. that includes block, ALL machine work and balancing, parts, and such. tight budget. quality is still there, but just not the cost.

also did check with SD, and yes, their price wasn't bad at all for what they do, but still out of budget for me.

so, with all the specs plugged in, i get a 10.15:1 motor. which is a little higher than wanted or expected, but not unwelcome. just have to dial in timing just right.
Reply With Quote Quick reply to this message
  #18 (permalink)  
Old 02-09-2013, 07:03 PM
Registered User
 
Join Date: Feb 2013
Location: southern Kentucky
Posts: 26
Wiki Edits: 0

Thanks: 19
Thanked 0 Times in 0 Posts
ok, so now here's a question. head gasket choice. it was mentioned using a 4.166 with .041 comp thickness. but in looking at all the choices i have, can i use a thicker, bigger bore gasket? fel pros q1044, 4.200 .051 which would yield a 9.8:1. or is going that large of a bore not good?
Reply With Quote Quick reply to this message
  #19 (permalink)  
Old 02-09-2013, 07:47 PM
F-BIRD'88's Avatar
Yada Yada Yada
 
Last photo:
Join Date: Oct 2005
Location: Ontario, Canada
Posts: 9,574
Wiki Edits: 0

Thanks: 3
Thanked 338 Times in 335 Posts
a 4.20" gasket is for a 400SBC
Reply With Quote Quick reply to this message
The Following User Says Thank You to F-BIRD'88 For This Useful Post:
maxxman04 (02-09-2013)
  #20 (permalink)  
Old 02-09-2013, 07:51 PM
Registered User
 
Join Date: Feb 2013
Location: southern Kentucky
Posts: 26
Wiki Edits: 0

Thanks: 19
Thanked 0 Times in 0 Posts
wouldn't work then? that's what i was afraid of. 4.166 is the biggest? can i use that bore size only thicker, like .045 or .053? the .053 is probably gonna put my squish to high tho.
Reply With Quote Quick reply to this message
  #21 (permalink)  
Old 02-09-2013, 08:03 PM
F-BIRD'88's Avatar
Yada Yada Yada
 
Last photo:
Join Date: Oct 2005
Location: Ontario, Canada
Posts: 9,574
Wiki Edits: 0

Thanks: 3
Thanked 338 Times in 335 Posts
Quote:
Originally Posted by maxxman04 View Post
wouldn't work then? that's what i was afraid of. 4.166 is the biggest? can i use that bore size only thicker, like .045 or .053? the .053 is probably gonna put my squish to high tho.
You are chasing a NON PROBLEM 10.20 is fine. You are creating your own headaches.

Verify the valve lift clearance before.....
Reply With Quote Quick reply to this message
The Following User Says Thank You to F-BIRD'88 For This Useful Post:
maxxman04 (02-09-2013)
  #22 (permalink)  
Old 02-09-2013, 08:08 PM
Registered User
 
Join Date: Feb 2013
Location: southern Kentucky
Posts: 26
Wiki Edits: 0

Thanks: 19
Thanked 0 Times in 0 Posts
feel like i'm new to this. sorry man. back in the day 10.2:1 on pump gas was almost unheard of. but technology and advancements have come a long way. and the vortecs are supposed to burn effeciently. ok.

i have read that a 4.166 will create a dead zone, but it has also been noted as a tested and commonly used size. so, i'll go with it. greatly, greatly appreciate all your help. by far the most help i've found. thanks everyone.
Reply With Quote Quick reply to this message
  #23 (permalink)  
Old 02-09-2013, 08:16 PM
F-BIRD'88's Avatar
Yada Yada Yada
 
Last photo:
Join Date: Oct 2005
Location: Ontario, Canada
Posts: 9,574
Wiki Edits: 0

Thanks: 3
Thanked 338 Times in 335 Posts
use 92 octane and not more than 36deg max timing. If it makes just as much WOT power at 34deg that is all it needs.
Cheap gas will not work in a high perf engine. And you read way too much.

Don;t you think if it mattered that much that the OEMS would make the gasket match the bore, to get low emissions.
Many engines have heads that do not match the bore etc etc.
On a BBC head gasket it is not even round.
Reply With Quote Quick reply to this message
  #24 (permalink)  
Old 02-09-2013, 08:21 PM
Registered User
 
Join Date: Feb 2013
Location: southern Kentucky
Posts: 26
Wiki Edits: 0

Thanks: 19
Thanked 0 Times in 0 Posts
had planned on 32-34 degrees already. also, not used to having a million different size head gaskets. not my first rebuild, but is first "real" build. just trying to get it right the first time. thanks!!!!
Reply With Quote Quick reply to this message
  #25 (permalink)  
Old 02-09-2013, 09:49 PM
cobalt327's Avatar
WFO
 
Last wiki edit: Intake manifold
Last journal entry: 1980 Malibu Wagon
Last photo:
Join Date: Mar 2009
Location: Atlanta
Age: 59
Posts: 5,037
Wiki Edits: 1616

Thanks: 128
Thanked 597 Times in 546 Posts
Quote:
Originally Posted by maxxman04 View Post
had planned on 32-34 degrees already. also, not used to having a million different size head gaskets. not my first rebuild, but is first "real" build. just trying to get it right the first time. thanks!!!!
Calculators:
Some use a negative number for a dish or valve relief, some use a positive number. BTW, the same discrepancies exist between various manufacturer's published volumes- some are negative, some positive for a dish or valve relief. Be sure of what the calculator you use calls for, and be sure of what the published figures are as well. Use the same calculator. The one I like is here, it states what to use (- or+).

You are looking to use as thick of a head gasket as possible, while keeping the quench distance within reason.

Dynamic is not voodoo, it can give insight as to whether or not to expect detonation from any particular combination. In your case, if the static CR is 10.15, the DCR is about 8.6:1 using the XE262H-10, which is at the upper end of what's recommended for pump gas.

You are correct on your total timing estimation of ~32 degrees max.

BTW, you do know you'll need self aligning rockers OR guideplates (just not both), and a Vortec intake, right? More on Vortec heads here.

Good luck.

Last edited by cobalt327; 02-09-2013 at 09:56 PM.
Reply With Quote Quick reply to this message
The Following User Says Thank You to cobalt327 For This Useful Post:
1Gary (02-10-2013)
  #26 (permalink)  
Old 02-09-2013, 10:05 PM
Registered User
 
Join Date: Feb 2013
Location: southern Kentucky
Posts: 26
Wiki Edits: 0

Thanks: 19
Thanked 0 Times in 0 Posts
Quote:
Originally Posted by cobalt327 View Post
Calculators:
Some use a negative number for a dish or valve relief, some use a positive number. BTW, the same discrepancies exist between various manufacturer's published volumes- some are negative, some positive for a dish or valve relief. Be sure of what the calculator you use calls for, and be sure of what the published figures are as well. Use the same calculator. The one I like is here, it states what to use (- or+).

You are looking to use as thick of a head gasket as possible, while keeping the quench distance within reason.

Dynamic is not voodoo, it can give insight as to whether or not to expect detonation from any particular combination. In your case, if the static CR is 10.15, the DCR is about 8.6:1 using the XE262H-10, which is at the upper end of what's recommended for pump gas.

You are correct on your total timing estimation of ~32 degrees max.

BTW, you do know you'll need self aligning rockers OR guideplates (just not both), and a Vortec intake, right? More on Vortec heads here.

Good luck.

yea. i ended up getting an rpm performer with the heads. it is in fact a vortec intake. and yea. already ordered self aligning roller tip rockers for vortecs. goin with a 4.166 bore .041 thick head gasket. great info. thanks!!!!
Reply With Quote Quick reply to this message

Recent Hotrodding Basics 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
head bolts or head studs? head gaskets? thefloyd1973 Engine 9 07-04-2008 09:25 AM
head ache. sbc heads excaliberprime Engine 8 03-07-2007 06:03 PM
head (ache) Paul H Engine 9 09-23-2006 10:57 AM
my new head ache bear1980 Engine 8 09-11-2006 09:32 PM
Nothing like pounding on some cheap headers killerformula Engine 5 07-09-2004 05:50 PM


All times are GMT -6. The time now is 01:21 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.