Changes for the street - 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 06-15-2010, 07:32 AM
Registered User
 
Join Date: Jan 2010
Location: Kentucky
Posts: 14
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Changes for the street

What would you change?

--------------------------------------------------------------------------------

Got a 78 Vette, 383 Motor... What would you change for street car fun?
Scat 4330 steel crank
Clevite H bearing 10rod& 10 main
Eagle H beam Rods- 6inch SRP Pistons- .040 over Trickflow Alum. (64cc) (195cfm)
Crane Cam's Stud girdles & 1.5 Roller Rockers
Cam- Comp Cam: .224 .231 .488 .483
Holley 670 Street Advenger

Has a Wieand 8000 intake on it, picked up a Edelbrock 2701 Performer. Is one better than the other? Should I change the Cam?

    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 06-15-2010, 08:48 AM
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
78 vette, then i would most likely change the gear to a 3.55 and use a 2800 rpm stall. what is you stock gears and trans type.

maybe a bigger carb. 3310 750 holley would work well.

if you have a L88 hood then get a RPM intake. otherwise stay with a low rise dual plane to fit under the stock hood.

hope you have headers on there.

a 4 spd manual conversion would be fun.

what compression ratio?

A little shot of n02 would be fun. 100 hp shot would make a big difference.

should be running ok the way it sits unless it has less than a 3.08 gear. 3.08 would be the absolute minimum gear to use with at least a 2600 stall.

proper carb setup and ignition timing are critical. you could be down 50hp with a bad tune. a cam that size requires at least 20 degrees of ignition timing at idle.

read these.

http://www.corvette-restoration.com/.../Timing101.pdf

http://www.bob2000.com/carb.htm
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 06-15-2010, 12:22 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
here are the stock 78 specs.

http://auto.howstuffworks.com/1978-corvette2.htm

3.08 gear with auto trans and 3.36 gear with a 4 spd.
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 06-15-2010, 07:45 PM
Registered User
 
Join Date: Jan 2010
Location: Kentucky
Posts: 14
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Thanks 4 the help, Got stock 3.08 gear & Auto 350? Trans. The RPM intake is better than the Performer or my 8000 Weiand? I have a L88 hood. Friend installed the Headers. I think that its a 2600 stall (How can I tell) Also, How do I determine the Compression Ratio?
Reply With Quote Quick reply to this message
  #5 (permalink)  
Old 06-16-2010, 07:27 AM
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
yes, the rpm intake is better. but the weiand 8000 will work ok and the weiand is better then the performer for your application.

I need to know what cc pistons you have (part number would help) to figure out the cr.

the engine seems to be built OK and should be enough power as long as the tune is good, but the gears are a little too tall for performance. However, I like 3.08's with 3 speed trans as a good balance between city and highway driving. Your cam will like a 3.55 to 3.73 gear so you have a mismatch there, but hard to drive on the highway with 3.73's and a th350 trans. maybe switch to a 700r trans with a 3.73 or 4.11 gear.

to check the converter stall, put the car in drive, step on the brake, give it a little gas, and watch the tach. you can see at what rpms the converter starts pulling down the engine really hard.

have you ever ran the car at your local drag strip?

if you are not wanting to change gears/trans then think about a bigger engine or n02.

I would think your car runs pretty strong right now. what you are trying to make it do?
Reply With Quote Quick reply to this message
  #6 (permalink)  
Old 06-17-2010, 06:19 AM
Registered User
 
Join Date: Jan 2010
Location: Kentucky
Posts: 14
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
I really don't know for sure on the pistons...I am hoping that their SRP pistons, #138104 Ur opinion, 700r over 200r? Never had it at track. Willing to change Transmission & Gears.
Reply With Quote Quick reply to this message
  #7 (permalink)  
Old 06-17-2010, 07:36 AM
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
those are 16cc dished pistons.

so the cr would be
(785 + 64 + 9 + 3 + 16)/ (64 + 9 + 3 + 16)= 9.53:1 cr.

A little low for your setup. Your engine could easily take 10:1 with those heads and cam.

the 200 trans has a better gear spread but the shift governor is a problem. Hard to get the shift points right with a 200r.

the 700 has a big step between 1st and 2nd, but the parts are more common. the th350 uses the same shift governor so that isn't an issue. I have experience with both the 200 and 700 and would use a 700. But since the first gear is so low in the 700, I would use a 3.55 gear instead of a 3.73.
Reply With Quote Quick reply to this message
  #8 (permalink)  
Old 06-17-2010, 11:09 AM
Registered User
 
Join Date: Jan 2010
Location: Kentucky
Posts: 14
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Thanks for all of the help....
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
Voting Starts Now, March Hotrodders.com Art Contest 32 / 31 Finished Street Rods!! Only Racing Hot Rod Art 14 04-29-2010 08:52 PM
383 driving me crazy, help with tuning issues (Holley Street Avenger) JLeatherman Engine 41 12-01-2009 09:31 PM
What is a street motor? Jsup Hotrodding Basics 4 11-09-2009 11:43 AM
Video: Wild Action from NMCA Fastest Street Car Shootout at Bradenton nmrajames Hotrodders' Lounge 4 04-18-2006 02:22 PM
Street Rod ( Autobody ) Schools Dusty Hotrodders' Lounge 0 01-05-2002 08:25 PM


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