tbi on 70 350 sbc - 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 09-05-2012, 09:05 PM
Member
 
Join Date: Feb 2004
Location: indiana
Posts: 36
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
tbi on 70 350 sbc

bought old 70 chevy, heads shot, believe its a 255hp 9:1 350. plan is to make a daily driver out of it.... have a fresh set of tbi 193s with a aluminum gm intake and 600 carb to boot on stand by.... truck has 3.08s and I have a 700r4 as well. switching to the 65.3 cc will add CR but will it still run on pump gas? budget on this one is much less than shoestring... have enough for head gasket kit... and if it will work what head gasket ( thickness ) should i use.

    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 09-05-2012, 09:41 PM
DoubleVision's Avatar
Not Considered a Senior Member
 
Last photo:
Join Date: Oct 2002
Location: Heart Of Dixie
Age: 40
Posts: 10,654
Wiki Edits: 0

Thanks: 15
Thanked 58 Times in 55 Posts
The 193 heads aren't the hot tip, thats for sure, but they'll work.
You should be able to bolt it together and be fine. Just use the standard cheapy fel pro gasket set or whatever set of head gaskets you can get cheaper. The 193's have a decent combustion chamber shape. Slap it together, test drive it, if you hear detonation back off 2 degrees, retest drive and listen again. If it still pings back off another 2 degrees, repeat until ping is gone.
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 09-05-2012, 09:48 PM
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
Using the same .015" shim gasket w/193 Head will bump Cr. up about 1 point.
4.00" Bore X 3.48" Stroke.
.025" Deck Ht., .015" Gasket.
5cc Piston, 76cc Head, .040" Quench = 9.03Cr
with 65cc Head = 10.16Cr

May not be low octane Pump friendly.
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 09-05-2012, 09:50 PM
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
DV, that's what a Buddy of mine did. Only way it would run was severely Retarded. Had poor power, boggomatic.
Reply With Quote Quick reply to this message
  #5 (permalink)  
Old 09-06-2012, 12:26 PM
Registered User
 
Last photo:
Join Date: Apr 2007
Location: Seattle, Wa
Posts: 6,752
Wiki Edits: 0

Thanks: 4
Thanked 418 Times in 360 Posts
Quote:
Originally Posted by shortdog View Post
bought old 70 chevy, heads shot, believe its a 255hp 9:1 350. plan is to make a daily driver out of it.... have a fresh set of tbi 193s with a aluminum gm intake and 600 carb to boot on stand by.... truck has 3.08s and I have a 700r4 as well. switching to the 65.3 cc will add CR but will it still run on pump gas? budget on this one is much less than shoestring... have enough for head gasket kit... and if it will work what head gasket ( thickness ) should i use.
Having the casting numbers of the old head would help in figuring out if you're headed for compression trouble or not.

For a carbed daily driver where top end horsepower to race Beemers isn't desired, the 193 Swirl Port makes for a decent head. They pull very well into the 4000 RPM range before they just can't feed the 350 any more mixture. They get pretty decent mileage at cruise due to the spin the ramps put on the incoming mixture through the intake valves. These heads have some of the desireable features of double squish/quench and the spark plug moved inboard toward the valves. These features and the high intake swirl make them tolerant of more compression without detonation. Still one neededs to be careful and not let the SCR get much beyond about 9 to 1. You don't want to compomise on detonation by brining timing advance down as the power and mileage loss quickly becomes significant.

Bogie
Reply With Quote Quick reply to this message
  #6 (permalink)  
Old 09-06-2012, 08:18 PM
Member
 
Join Date: Feb 2004
Location: indiana
Posts: 36
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
not sure of the stock head casting # but know motor has 90077 miles actual, was tied up in an estate for 9 yrs. all original.... truck runs and drives but has head issues from sitting...have 193s with less than 100 miles on rebuild and thought maybe since stock heads were 76 cc that maybe 193s 65 cc would wake it up tourqe wise and it would be a good daily driver.

thanks
Reply With Quote Quick reply to this message
  #7 (permalink)  
Old 01-14-2013, 04:45 PM
Member
 
Join Date: Feb 2004
Location: indiana
Posts: 36
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
maybe not head issue after all, could be lifters....starts and idles ok, but drive it and it has no power, pops and cracks...seems maybe floating the valves, thought at first valves sticking, springs weak... but maybe not.... any suggestions....has new plugs, wires, carb, and coil. thanks
Reply With Quote Quick reply to this message
  #8 (permalink)  
Old 01-15-2013, 06:26 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
Have you checked to see if the Cam is going flat, Lobes/Lifters wearing/worn?
Reply With Quote Quick reply to this message
  #9 (permalink)  
Old 01-15-2013, 09:25 AM
Registered User
 
Last photo:
Join Date: Apr 2007
Location: Seattle, Wa
Posts: 6,752
Wiki Edits: 0

Thanks: 4
Thanked 418 Times in 360 Posts
Quote:
Originally Posted by SSedan64 View Post
Have you checked to see if the Cam is going flat, Lobes/Lifters wearing/worn?
That's a big X2, that year is right in the middle of the flat come lobe era.

Bogie
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
350 TBI to 350 TBI VORTEC SWAP IWANTMOREHP Engine 7 05-02-2012 06:40 AM
sbc 350 carb to TBI...help needed fireman111 Engine 2 02-24-2011 09:36 PM
1988 350 / 5.7 SBC TBI Engine. Icejeep Engine 12 03-26-2010 07:36 PM
91 sbc 350 TBI freezing up montea Engine 6 02-09-2008 07:16 AM
Checking for spark on SBC 350 TBI? Neophyte Electrical 7 04-06-2005 02:47 PM


All times are GMT -6. The time now is 08:53 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.