305 ho cam - Page 3 - 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
lost password?   |   register now

LinkBack Thread Tools
  #31 (permalink)  
Old 12-19-2012, 11:57 AM
F-BIRD'88's Avatar
Yada Yada Yada
Last photo:
Join Date: Oct 2005
Location: Ontario, Canada
Posts: 9,153
Wiki Edits: 0

Thanks: 5
Thanked 380 Times in 374 Posts
The amount of actual chamber de shrouding is very very small. and its not where you think it is.
A very minimum of metal removal is all that is nessessary in the chamber to fit the larger valve.
These heads can be flat milled to a finished 51cc when all done. The physical limit is the spark plug boss and edge of the 1.94" intake valve seat.

CC the heads after rework/before milling for compression.
they will end up around 62cc when all done. CC and mill as required.
use a thin .015" felpro 1094 head gasket
Does this 305 have a flat top w 4 valve relief piston (L-69 motor) or a dish piston in it?
ya it matters. that 218deg cam needs compression.

you do not need to get all carried away with deshrouding on this head.
Use a drill bit to "gauge" the chamber wall to stock valve edge clearance, when the valve is partally open. Compare the to the larger new valve.
(.050" bigger valve radius) don;t get carried away. This is not a hi flow area. most of the flow is directed towards the spark plug in the chamber, on a SBC head. On this motor you need the compression ratio more than the chamber flow improvment.
Do not get carried away deshrouding.
Thats the whole point of just going to a 1.94" valve on this head.

flow your garden hose thru the intake port to see the flow pattern.


Last edited by F-BIRD'88; 12-19-2012 at 12:22 PM.
Reply With Quote Quick reply to this message
Sponsored Links
  #32 (permalink)  
Old 12-19-2012, 12:06 PM
F-BIRD'88's Avatar
Yada Yada Yada
Last photo:
Join Date: Oct 2005
Location: Ontario, Canada
Posts: 9,153
Wiki Edits: 0

Thanks: 5
Thanked 380 Times in 374 Posts
Unless you got and will run a 25" tall tire the 4.11's are useless on this combo.

35" tires need a 5.13 gear minimum ( not less than)
a 5.57:1 ratio is just right for this combo with 35" tall tires.

the hot rodded 305 needs to rev to make its power.
Reply With Quote Quick reply to this message
  #33 (permalink)  
Old 12-19-2012, 02:54 PM
vinniekq2's Avatar
Registered User
Join Date: Jun 2012
Location: BC,Canada
Age: 56
Posts: 8,320
Wiki Edits: 0

Thanks: 342
Thanked 814 Times in 780 Posts
35 tall tires/4.11 gears/turbo 350 transmission/2800 pound car/6500 rpm

first gear=66//second gear=109//third gear=165

5.13 gears

first gear=52 ///second gear=87///third gear=132
Reply With Quote Quick reply to this message

Recent Engine posts with photos

Quick Reply

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:
Please enter a password for your user account. Note that passwords are case-sensitive.
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:


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
what cam for 305 crashu1972 Engine 10 09-05-2010 04:27 PM
cam for 305 ho Imaginos Engine 5 03-31-2010 10:51 PM
305 cam V305 Engine 4 05-11-2007 09:46 PM
305 cam handyman Engine 2 09-07-2004 12:22 AM
305 Cam Silver_Camaro Engine 17 11-02-2003 06:27 PM

All times are GMT -6. The time now is 12:39 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.