Need Help On Hopping Up A 86 305 - 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 12-07-2009, 04:38 AM
Registered User
 
Join Date: Dec 2009
Location: Florida
Posts: 8
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Need Help On Hopping Up A 86 305

Whats the 1st mod I should put on my 86 305 engine to make the biggest gains? Not really lookin to go to a bigger engine tryin to keep the original but just gotta make more power...

    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 12-07-2009, 04:52 AM
70455's Avatar
Registered User
 
Join Date: Dec 2009
Location: Kentucky
Posts: 108
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Headers, and change gears in the rearend.
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 12-07-2009, 05:14 AM
Registered User
 
Join Date: Dec 2009
Location: Florida
Posts: 8
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Thanks

I was considering going with Hooker Headers but what kind of gearing should I look at?
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 12-07-2009, 05:55 AM
bondo's Avatar
Member
 
Last photo:
Join Date: Nov 2002
Location: Chaumont Bay N.Y.
Posts: 960
Wiki Edits: 0

Thanks: 7
Thanked 15 Times in 15 Posts
Quote:
but what kind of gearing should I look at?
Ayuh,... That'll depend on what you're startin' with...
Reply With Quote Quick reply to this message
  #5 (permalink)  
Old 12-07-2009, 06:06 AM
70455's Avatar
Registered User
 
Join Date: Dec 2009
Location: Kentucky
Posts: 108
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
The Grand Prix has pretty high gears. Something around 3.23 or 3.42 would be good.
Reply With Quote Quick reply to this message
  #6 (permalink)  
Old 12-07-2009, 06:52 AM
Registered User
 
Join Date: Dec 2009
Location: Florida
Posts: 8
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Good deal! I appreciate it. Im wanting to push around the 300-400HP range. Im looking into heads,Intake,and a Carb.
Reply With Quote Quick reply to this message
  #7 (permalink)  
Old 12-07-2009, 08:18 AM
Registered User
 
Join Date: Nov 2009
Location: Charleston
Posts: 227
Wiki Edits: 0

Thanks: 0
Thanked 3 Times in 3 Posts
I received a response about some 86/305 heads. IF your cast.# is 4416 or 4440 they have the good 58cc chambers and decent runners. Just have 1.94/1.50 valves put in them and do some bowl work and "clean-up" porting. Cam change...headers....intake and carb and you should be on your way to much bigger HP.
6sally6
Reply With Quote Quick reply to this message
  #8 (permalink)  
Old 12-07-2009, 09:49 AM
70455's Avatar
Registered User
 
Join Date: Dec 2009
Location: Kentucky
Posts: 108
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
If you want 400hp you would be better off building a 350 making it a stoker.
Reply With Quote Quick reply to this message
  #9 (permalink)  
Old 12-07-2009, 11:28 AM
my87Z's Avatar
Veteran/Firefighter-EMT-I CRT
 
Join Date: Mar 2009
Location: maryland
Age: 31
Posts: 1,685
Wiki Edits: 0

Thanks: 6
Thanked 11 Times in 11 Posts
Quote:
Originally Posted by 70455
If you want 400hp you would be better off building a 350 making it a stoker.
kinda X2, you dont need a stroker to make 400hp out of a 350, that's easy, but that's alos another topic

if you find a decent set of 416 heads to as mentioned before, put a mild cam it maybe around a 208-212 duration @ .050 a better intake and carb, headers and better exhaust, with this you should have to much problem makeing maybe about 300hp and likely close to 350tq
Reply With Quote Quick reply to this message
  #10 (permalink)  
Old 12-07-2009, 11:47 AM
bigboytoyracing34's Avatar
never too fast
 
Last photo:
Join Date: Dec 2009
Location: rapid city,sd
Posts: 38
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
go with 3.29 for a grand prix
Reply With Quote Quick reply to this message
  #11 (permalink)  
Old 12-07-2009, 07:51 PM
curtis73's Avatar
Hates: Liver. Loves: Diesel
 
Last wiki edit: How to find cheap parts
Last journal entry: Found an LQ9 today
Last photo:
Join Date: Dec 2005
Location: Carlisle, PA
Age: 41
Posts: 5,173
Wiki Edits: 16

Thanks: 7
Thanked 9 Times in 6 Posts
You'll spend a lot more money getting a 305 to 400 hp than you would if you bought a 350 and built it... even factoring in the purchase price of the 350 if you're careful. And you'll have gobs more torque and streetability... but its your car so do whatever makes you happy. That's the most important part.

But keep in mind, you're starting with an engine that makes 150 hp. You're hoping to almost triple its output. Prepare to spend several thousand getting there, especially considering you'll need to spin it to 6000+ rpm to get it. High RPMs aren't cheap. Or, spend $1100 on a reman 350 vortec, use a 224/234 cam, and make 400 hp before 5700 rpms.
Reply With Quote Quick reply to this message
  #12 (permalink)  
Old 12-08-2009, 11:27 AM
70455's Avatar
Registered User
 
Join Date: Dec 2009
Location: Kentucky
Posts: 108
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
You wouldn't have to build a stoker, but it's cool to have one. I built a 305 one time built it to around 300 hp never was happy with it. Later same car built 350 around 350 hp it cost less money and ran a lot better and it was in a 81 Grand Prix with 3.73 gears, but that was back in the when gas one dollar gallon. So low gears where cool back than 3.23 with a mild 350 would be the way to go.

Main thing is good flowing heads, higher compression pistons, good cam, headers, good intake and carb. Right gears in the rear end.
Reply With Quote Quick reply to this message
  #13 (permalink)  
Old 12-09-2009, 03:24 PM
Registered User
 
Join Date: Dec 2009
Location: kokomo, indiana
Posts: 3
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
I had a 305 from a 86 camaro, took it .040 over with new kb 10.1 pistons, summit racing .465/488 lift cam, torker II intake with holly 650DP carb, heads got new springs and 1.6 rocker arms (stock is 1.5) which made a .496/520 lift cam, hooker headers full tube 1 5/8... 3k stall converter, th350 tranny, and installed it all in a 91 s10 with a 7.5 10 bolt, 4.11 gear stock rear end, ran a 10.35 @ 134 mph, and could have gone faster but got kicked out for no roll cage in the truck! It had a lot more power over my ford 351c, mild build motor
Reply With Quote Quick reply to this message
  #14 (permalink)  
Old 12-09-2009, 04:27 PM
ericnova72's Avatar
More for Less Racer
 
Join Date: Jan 2007
Location: S.W. Lower Michigan
Age: 47
Posts: 9,464
Wiki Edits: 0

Thanks: 29
Thanked 486 Times in 441 Posts
Quote:
Originally Posted by 305s10
I had a 305 from a 86 camaro, took it .040 over with new kb 10.1 pistons, summit racing .465/488 lift cam, torker II intake with holly 650DP carb, heads got new springs and 1.6 rocker arms (stock is 1.5) which made a .496/520 lift cam, hooker headers full tube 1 5/8... 3k stall converter, th350 tranny, and installed it all in a 91 s10 with a 7.5 10 bolt, 4.11 gear stock rear end, ran a 10.35 @ 134 mph, and could have gone faster but got kicked out for no roll cage in the truck! It had a lot more power over my ford 351c, mild build motor
I call BS here, calculater says you would need 545 hp to move a 2900 lb vehicle to those times. There is no way a naturally aspirated 305 makes that kind of power without a power adder, especially with that parts list- Hydro cam, Torker II .

Let me guess, Genie in a Bottle(NOS), right?? Go blow your smoke at someone else.
Reply With Quote Quick reply to this message
  #15 (permalink)  
Old 12-09-2009, 04:48 PM
Registered User
 
Join Date: Dec 2009
Location: kokomo, indiana
Posts: 3
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
You can think what you want, I KNOW my times. Truck weights 2050 lbs with driver, No NOS, 22" wide slicks, the 4.11 gear help out a lot too! Dyno put me at 437hp and 478 torque....

If you don't have anything nice to say....DON'T say anything at all!!!!

Last edited by 305s10; 12-09-2009 at 04:56 PM.
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:
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
Connector ident?? 86, GM 305 monte carlo bubbahotep Electrical 4 11-02-2008 07:22 PM
are these stock in a 86 irockz 305 86irocz Engine 12 07-14-2007 09:53 AM
86 silverado 305 CraptasticLucky Hotrodding Basics 11 06-15-2004 10:39 PM
305 in 86 elky walkingwolfmike Engine 2 04-20-2003 09:54 PM
86 - 305 what cam? Iroc'o Engine 2 10-09-2002 05:43 PM


All times are GMT -6. The time now is 12:28 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.