more Horsepower in a std L48 - SmokinVette.com Forums
 
LinkBack Thread Tools Search this Thread Display Modes
post #1 of 8 (permalink) Old 08-24-2007, 12:49 AM Thread Starter
Smokin Member
 
Join Date: Aug 2007
Location: sweden
Posts: 3
more Horsepower in a std L48

I´m just an owner of a 350 corvettw -74 350 (L48 I guess)with 4 speed gearbox. Standard engine less than 200 horsepower, it is not good enough. My knowledge havt to be improved about V8 engines. I want 375-400. I get when I bought the car new parts :cam Erson E110421 (296° IN 228° IN .472" IN 108°. 0° .000" IN. 5750. Hi-Flow IH) A Edelbrock intake and a Edelbrock carb 650 Thunder AVS , and headers. Next step have to do something with the heads and comp I guess. What can anybody give me som support?

Thanks
raceman is offline  
Sponsored Links
Advertisement
 
post #2 of 8 (permalink) Old 10-02-2007, 05:38 AM
Smokin Member
 
Join Date: Oct 2007
Location: Florida
Posts: 4
Quote:
Originally Posted by raceman View Post
I´m just an owner of a 350 corvettw -74 350 (L48 I guess)with 4 speed gearbox. Standard engine less than 200 horsepower, it is not good enough. My knowledge havt to be improved about V8 engines. I want 375-400. I get when I bought the car new parts :cam Erson E110421 (296° IN 228° IN .472" IN 108°. 0° .000" IN. 5750. Hi-Flow IH) A Edelbrock intake and a Edelbrock carb 650 Thunder AVS , and headers. Next step have to do something with the heads and comp I guess. What can anybody give me som support?

Thanks
Get the heads port and polished would be good start.
chexbucks is offline  
post #3 of 8 (permalink) Old 12-27-2007, 11:34 AM
Smokin Member
 
Join Date: Nov 2006
Location: Battle Ground, Wa
Posts: 8
just finished complete rebuild of 81 with 350. Bored block .030 over, decked block to 9.0, flat top pistons, hotter cam, roller rockers, World Product 2.02 heads w/ss valves, Edelbrock Performer intake, Holley 650 and put a 700-R tranny behind it all. Changed rear end gearing to 3.38. WOW what a ride. It will break em' loose shifting into 3rd. Horses estimated at 375. When weather gets better here I will take it to town for a dyno run.
rkyle is offline  
post #4 of 8 (permalink) Old 12-28-2007, 08:27 AM
Smokin 100HP Club
 
gonesailing's Avatar
 
Join Date: Feb 2007
Location: Mobile, Alabama
Posts: 126
Quote:
Originally Posted by rkyle View Post
just finished complete rebuild of 81 with 350. Bored block .030 over, decked block to 9.0, flat top pistons, hotter cam, roller rockers, World Product 2.02 heads w/ss valves, Edelbrock Performer intake, Holley 650 and put a 700-R tranny behind it all. Changed rear end gearing to 3.38. WOW what a ride. It will break em' loose shifting into 3rd. Horses estimated at 375. When weather gets better here I will take it to town for a dyno run.
Man thats alot of work, who did the work you or a shop? 375HP not to bad, you plan to get her on a dyno to see what you get?
gonesailing is offline  
post #5 of 8 (permalink) Old 12-28-2007, 07:20 PM
Smokin Member
 
Join Date: Nov 2006
Location: Battle Ground, Wa
Posts: 8
I had a local "spped shop" do the boring, decking and piston and crank assy. I assembled and installed all other upgrades. It was a lot of fun and am looking forward to doing another vette in the near future.
rkyle is offline  
post #6 of 8 (permalink) Old 01-04-2008, 01:50 PM
Smokin Member
 
Grimbo's Avatar
 
Join Date: Dec 2007
Location: Orangevale,Ca
Posts: 26
my buddy has a program that you can use to punch in all the mods your going to do i.e. cam, heads, stroke, bore etc... and it does a pretty dang good job at giving you a HP TQ figures. i think its called like DYNO 2000 or something, really neat. i calculated what my build-up will be and it figures around 400hp and 430tq.
Grimbo is offline  
post #7 of 8 (permalink) Old 01-06-2008, 07:22 AM
Smokin 100HP Club
 
Fly-n-C3's Avatar
 
Join Date: Feb 2007
Location: Wyoming
Posts: 101
Horsepower is made in the heads and camshaft profile. With a set of high flowing heads, your hp will increase. For a street driven car, i wouldn't go over 190cc intake runer size. Remember, the more air and fuel you can stuff into a cylinder, the more power you will make.

Personaly i like the ProTopline heads, or Pro Action heads vs Dart heads. The protopline and proaction heads will out flow a Dart head right out of the box. Also don't forget about Vortec heads. These heads out of the box will flow 170cc. With mild bowl work and a better valve job these will close to 180cc.

My set up has Vortec heads, TRUE flat top pistons (no dish at all) .488 lift with .292 dur on 112LS on a 2* advance. I'm putting out around 380hp with this set up. I could get to 400hp with a little more tweeking.

As for the Dyno programs, Yes they are close, but at the end when it pumps out your hp and Torque figures, you need to deduct around 8-10% for your results. This is 90% of the time be almost right on.

Good luck on your build-up.....
Fly-n-C3 is offline  
post #8 of 8 (permalink) Old 01-23-2008, 07:47 PM
Smokin Member
 
Grimbo's Avatar
 
Join Date: Dec 2007
Location: Orangevale,Ca
Posts: 26
thats what my buddy said when he did the calculations and his BB, about 10% should be deducted off, but if i get somewhere in the ballpark i would be Very pleased
Grimbo is offline  
Sponsored Links
Advertisement
 
Reply

Share This Thread

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the SmokinVette.com Forums forums, you must first register.
Please enter your desired user 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:
OR

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.



Thread Tools Search this Thread
Show Printable Version Show Printable Version
Email this Page Email this Page
Search this Thread:

Advanced Search
Display Modes
Linear Mode Linear Mode



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

 
For the best viewing experience please update your browser to Google Chrome