chevy 305,can it be fast? - 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 03-05-2007, 10:52 PM
Registered User
 
Join Date: Mar 2007
Location: HOUSTON,TX
Posts: 8
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
chevy 305,can it be fast?

I have an 81 elcamino that has a V8, 305.Does anyone have any ideas on how i can make some more horsepower without adding a supercharger or nitrous?

    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 03-05-2007, 11:01 PM
Gokussj5okazu's Avatar
Registered User
 

Last journal entry: 336 Stroker: Teardown
Last photo:
Join Date: Nov 2006
Location: Fredericktown, MO
Age: 24
Posts: 156
Wiki Edits: 0

Thanks: 1
Thanked 0 Times in 0 Posts
Welcome to Hotrodders, Burnout

A good cam and better flowing exhaust will definitely wake it up some, depending on how it's built now. I assume it's stock?

To get a lot out of a 305 you either have to throw alot of money at it (metaphoricly ) or do something clever, like a stroker build on it.
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 03-05-2007, 11:22 PM
Registered User
 
Join Date: Dec 2006
Location: West Palm Beach
Posts: 12
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
2 words, stroke it
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 03-05-2007, 11:33 PM
TooMany2count's Avatar
A Half Crippled Old SOB....
 
Last wiki edit: GM RPO build codes Last photo:
Join Date: Jan 2003
Location: Cahokia,IL..... Donate Blood Products & Sign your DONORS CARD
Posts: 807
Wiki Edits: 5

Thanks: 0
Thanked 1 Time in 1 Post
one 305 mod info

more tips on 305 mods..joe
Reply With Quote Quick reply to this message
  #5 (permalink)  
Old 03-06-2007, 03:13 AM
Guy Hiltz's Avatar
Member
 
Last photo:
Join Date: Sep 2005
Location: Nova Scotia Canada
Posts: 1,004
Wiki Edits: 0

Thanks: 0
Thanked 1 Time in 1 Post
chevy 305,can it be fast ?

There was a very interesting article in the latest issue of Engine Masters,they took an older stock 305,put on a set of heads,a cam,intake and new carb and got 372 HP.I forget what heads they used,but the numbers were certainly impressive.They didnt touch the bottom end.
Reply With Quote Quick reply to this message
  #6 (permalink)  
Old 03-06-2007, 05:17 AM
Hippie's Avatar
Analog man in a digital world.
 

Last journal entry: HEI comparison.
Last photo:
Join Date: May 2003
Posts: 2,255
Wiki Edits: 0

Thanks: 3
Thanked 5 Times in 5 Posts
Don't know about "fast" but they can be made to run pretty good, they do seem to like cams with a little tighter LSA than a 350. What exactly are your goals? I know a 305 HO with a 200-4R and a set of 3.73 gears in a G-body is pretty responsive, maybe not what most people consider "fast" but it will make people turn around and look when you stab the go pedal and makes stop light to stoplight driving more fun. It would definitely put your driving priviledges in peril.
Reply With Quote Quick reply to this message
  #7 (permalink)  
Old 03-06-2007, 06:06 AM
Blazin72's Avatar
You got a leaky spark tube...
 
Last wiki edit: Rearend removal
Last journal entry: General Lee
Last photo:
Join Date: Jul 2005
Location: Union, WA
Age: 32
Posts: 2,868
Wiki Edits: 19

Thanks: 0
Thanked 2 Times in 2 Posts
Guy Hiltz, I think this might be the article you were thinking of?
http://www.popularhotrodding.com/eng...cks/index.html
BURNOUT, don't let anybody tell you you can't hot rod a 305...
Reply With Quote Quick reply to this message
  #8 (permalink)  
Old 03-06-2007, 08:29 AM
F-BIRD'88's Avatar
Yada Yada Yada
 
Last photo:
Join Date: Oct 2005
Location: Ontario, Canada
Posts: 9,570
Wiki Edits: 0

Thanks: 3
Thanked 336 Times in 333 Posts
Quote:
Originally Posted by BURNOUT!
I have an 81 elcamino that has a V8, 305.Does anyone have any ideas on how i can make some more horsepower without adding a supercharger or nitrous?
What are you willing to do to get more power?
A 305 responds to moda just like any other SBC.

Your 305 is a low perf base engine. with low compression small heads and valves and tiny tiny camshaft and real bad exhaust manifolds. All this needs to be changed.

A hot rodded 305 will need a high(er) stall converter and a higher rear gear ratio than a simular hopped up 350.
The torque bnd gets shifted much higher in a 305 or any small ci motor when modded.

EG: the Monte Carlo SS 305 motor came with a special 3000 stall lockup converter and 3.73's.

To start with pull off one valve cover and get the cylinder head csting number off your heads.
Yes you can make your 305 fast. How fast do you want to go? 14's 13's 12's..... Do you want a radical street machine, or is gas mileage a concern. What do you use the car for, most? Will take work on your part thou.
Reply With Quote Quick reply to this message
  #9 (permalink)  
Old 03-06-2007, 11:59 AM
Registered User
 
Join Date: Mar 2007
Location: HOUSTON,TX
Posts: 8
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Quote:
Originally Posted by F-BIRD'88
What are you willing to do to get more power?
A 305 responds to moda just like any other SBC.

Your 305 is a low perf base engine. with low compression small heads and valves and tiny tiny camshaft and real bad exhaust manifolds. All this needs to be changed.

A hot rodded 305 will need a high(er) stall converter and a higher rear gear ratio than a simular hopped up 350.
The torque bnd gets shifted much higher in a 305 or any small ci motor when modded.

EG: the Monte Carlo SS 305 motor came with a special 3000 stall lockup converter and 3.73's.

To start with pull off one valve cover and get the cylinder head csting number off your heads.
Yes you can make your 305 fast. How fast do you want to go? 14's 13's 12's..... Do you want a radical street machine, or is gas mileage a concern. What do you use the car for, most? Will take work on your part thou.
Well i want to run about 13's and its my only car so i have to get desent gas mileage.Thanks people for the information i now have an idea of what i got to do.I was thinking about changing the carb,manifold,heads,cam,and putting 3.73's gears on it.What do yall think?
Reply With Quote Quick reply to this message
  #10 (permalink)  
Old 03-06-2007, 12:38 PM
F-BIRD'88's Avatar
Yada Yada Yada
 
Last photo:
Join Date: Oct 2005
Location: Ontario, Canada
Posts: 9,570
Wiki Edits: 0

Thanks: 3
Thanked 336 Times in 333 Posts
I think its very do--able. What transmission do you have now? Whats your budget and skill level? what performacne parts do you have laying around that you can either use or trade for better ones? Again what head castings are on the motor now? Does it have to pass an emissions test? Visual inspection?
Reply With Quote Quick reply to this message
  #11 (permalink)  
Old 03-06-2007, 12:38 PM
stepside454's Avatar
Member
 
Last photo:
Join Date: Dec 2003
Location: St. louis area
Age: 47
Posts: 1,074
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
I had an 86 GMC Cabballero (same as ElCamino) that ran 13.80s with a very mild 305 with 3.23 gears.
I used KB143 +.030 pistons, with the L-98 Corvette aluminum heads gave me just shy of 10.0:1 compression. I used a Comp cams Extreme energy gring, I forget whitch one, one of the milder ones, I think it was a XE262. it wass all in by 6000 RPMs. I ran a Performer intake, 570 Holley, DUI ignition,Dynomax headers, 2.5" dual exhaust through a pair of catco convertors & Dynomax Turbo mufflers. It was mild enough that it would pull 16" of vacuum at idle, pass IM240 smog. It got horrible MPG however, but it wasnt a daily driver, I wasnt to consened about the MPG. I used a T-350 tranny with a 2200 RPM convertor.
It was very timing sensitive & also even the smallest change in fuel mixture would make big changes for better or worse. John
Reply With Quote Quick reply to this message
  #12 (permalink)  
Old 03-06-2007, 12:53 PM
killerformula's Avatar
Hotrodders.com Moderator
 
Last wiki edit: Carburetor
Last journal entry: Clean up
Last photo:
Join Date: Oct 2003
Location: Northeast
Age: 34
Posts: 3,485
Wiki Edits: 3

Thanks: 13
Thanked 27 Times in 18 Posts
I basically have a canned respose to this question, as it has been asked several times (try a search you'll probaly find some good threads). ANyway, here it is:

If your goal is overal performance, or to just have a quicker car, start from the back forward. First thing maybe gears, then an overdrive trans (which generally have a lower first gear and allow you to run a steeper rear gear more comfortably). Torque converter is a great addition as well. I would choose parts that you think will work well with a larger cube motor later on. That way if you put one in you're good to go. And if you never get to it, you can just run it as is.

You could probably find an entire rear end with posi and just slide it in there for 2-500 bucks (I'm not sure what they're going for for your model/year). Stall converters are anywhere from 150-400 dollars (depending on the trans). A trans in decent shape might run you 200-600 depending on how many they have on hand etc. 1000 dollars will get you going a lot faster if you spend it with the above method than if you throw it at a 305. The heads you'd need to make power are going to cost 6-800 bucks alone, and with no other swap (cam etc) you'd gain maybe 35 horse even with really nice heads.

K
Reply With Quote Quick reply to this message
  #13 (permalink)  
Old 03-06-2007, 12:55 PM
stepside454's Avatar
Member
 
Last photo:
Join Date: Dec 2003
Location: St. louis area
Age: 47
Posts: 1,074
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
very good point killer...all the engine wont make a differance if you cant get into the power band,smaller engines need to get up on top
Reply With Quote Quick reply to this message
  #14 (permalink)  
Old 03-06-2007, 12:57 PM
Hippie's Avatar
Analog man in a digital world.
 

Last journal entry: HEI comparison.
Last photo:
Join Date: May 2003
Posts: 2,255
Wiki Edits: 0

Thanks: 3
Thanked 5 Times in 5 Posts
Quote:
Originally Posted by killerformula
I basically have a canned respose to this question, as it has been asked several times (try a search you'll probaly find some good threads). ANyway, here it is:

If your goal is overal performance, or to just have a quicker car, start from the back forward. First thing maybe gears, then an overdrive trans (which generally have a lower first gear and allow you to run a steeper rear gear more comfortably). Torque converter is a great addition as well. I would choose parts that you think will work well with a larger cube motor later on. That way if you put one in you're good to go. And if you never get to it, you can just run it as is.

You could probably find an entire rear end with posi and just slide it in there for 2-500 bucks (I'm not sure what they're going for for your model/year). Stall converters are anywhere from 150-400 dollars (depending on the trans). A trans in decent shape might run you 200-600 depending on how many they have on hand etc. 1000 dollars will get you going a lot faster if you spend it with the above method than if you throw it at a 305. The heads you'd need to make power are going to cost 6-800 bucks alone, and with no other swap (cam etc) you'd gain maybe 35 horse even with really nice heads.

K
Read it, learn it, live it! Excellent advice.
Reply With Quote Quick reply to this message
  #15 (permalink)  
Old 03-06-2007, 01:11 PM
firestone's Avatar
http://teamrfc.gospelcom.net
 
Last photo:
Join Date: Nov 2003
Location: Fenton MI
Age: 32
Posts: 1,743
Wiki Edits: 0

Thanks: 0
Thanked 1 Time in 1 Post
I agree with killerformula. Beyond that, when you start buying parts for the motor, I recommend buying parts that you can use on a 350 or 400 based motor in the future. I would use headers/intake/cam (especially if it is a roller) that would also work in a larger motor in the future. I would not recommend buying a set of aftermarket 305 heads or getting any head work done on yours (unless you do it yourself) except for springs. If you ever go to another motor, they may will not work due to the small chambers, and the aftermarket options open up greatly when you get away from 305 heads.

Adam
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
SBC 350 superiority rebuttle...was:POWERED BY CHEVY, WRITTEN ON A FORD, (from 'Engine Oldsmolac911 Hotrodders' Lounge 50 01-12-2011 10:00 PM
Hi. just wondering why the 350 chevy small block is so good... judgedredd Hotrodders' Lounge 78 06-25-2010 08:01 AM
9" to chevy conversion bigiron Transmission - Rearend 4 10-11-2005 10:32 PM
Help, 1977 Chevy C20 with Rochester Q-jet won't pass smog. Terje Engine 18 07-16-2004 03:14 AM
New Member Introduction - 48 Chevy Rodder 48 Chevy Rodder Hotrodders' Lounge 0 10-20-2001 03:04 AM


All times are GMT -6. The time now is 07:53 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.