408 on the cheap.. - LS1TECH - Camaro and Firebird Forum Discussion

Notices
Generation III Internal Engine 1997-2006 LS1 | LS6
Sponsored by:
Sponsored by:

408 on the cheap..

 
Old 11-01-2018, 06:52 PM
  #1  
12 Second Club
Thread Starter
 
Join Date: Mar 2014
Location: fayetteville n.c
Posts: 49
Default 408 on the cheap..











Was at the salvage yard and found a lq4, picked up the short block for 160 bucks. Take off ls3 heads with rockers for 675. Ordered the speed master 408 kit was 900 to the house. Dropped it off at the machine shop to get it balanced.

All of the piston and rods came matched and were within a gram. The rods and crank were within spec also. The only thing is that he has to add heavy metal to balance it, which is fine with me.
I have searched and people only flame the the kit but no one that has actually bought it has spoken up (as far as my searching has brought up) but so far so good. The kit was on backorder so someone is buying them. No Bashing, this is just a thread to share my results as I build it. If it dies it dies.

This will be going in my 87 cutlass, along with a drop in quick performance 9 inch, and twin disc aluminum flywheel clutch setup. Just waiting on heads, and parts to come back from machine shop then the build up will commence. stay tuned.

Last edited by alexj01_83; 11-01-2018 at 08:44 PM. Reason: typo
alexj01_83 is offline  
Old 11-01-2018, 08:18 PM
  #2  
TECH Fanatic
iTrader: (1)
 
Jtm2085's Avatar
 
Join Date: Jun 2007
Posts: 1,076
Default

Following. This is my kind of build lol, good luck
Jtm2085 is offline  
Old 11-03-2018, 09:08 PM
  #3  
TECH Regular
 
Bspeck82's Avatar
 
Join Date: Jan 2017
Posts: 491
Default

I probably wouldn't run ls3 heads unless it will spend most of it's life 5000+. In which case would blow the whole budget concept to build properly. Just my 2˘
Bspeck82 is offline  
Old 11-03-2018, 09:58 PM
  #4  
TECH Fanatic
iTrader: (1)
 
Che70velle's Avatar
 
Join Date: Jan 2012
Location: Dawsonville Ga.
Posts: 1,900
Default

Originally Posted by bspeck82 View Post
i probably wouldn't run ls3 heads unless it will spend most of it's life 5000+. In which case would blow the whole budget concept to build properly. Just my 2˘
lol!!!
Che70velle is offline  
Old 11-03-2018, 10:13 PM
  #5  
TECH Addict
iTrader: (3)
 
Join Date: Aug 2013
Location: Iowa
Posts: 2,297
Default

Originally Posted by Bspeck82 View Post
I probably wouldn't run ls3 heads unless it will spend most of it's life 5000+. In which case would blow the whole budget concept to build properly. Just my 2˘
You really think all the LS3's at only 376ci spend there life at 5000+, For a budget build 408ci engine the LS3 heads are a perfect match.
LLLosingit is offline  
Old 11-04-2018, 01:19 AM
  #6  
On The Tree
 
Join Date: Dec 2013
Location: North Vanacouver , BC
Posts: 116
Default

Saw it the other day on jegs , was looking into it for for a heavy 4x4 to build good low end torque . Subscribed .
I think the LS3 heads would go well with this considering the extra cubes and stroke .
Lsx Rubi is offline  
Old 11-04-2018, 06:34 PM
  #7  
12 Second Club
Thread Starter
 
Join Date: Mar 2014
Location: fayetteville n.c
Posts: 49
Default


Rear end installed. with 1 7/8 headers, 3inch exhaust and single camber flowmasters.

Cam that i'm currently running. going to swap it over.

Upgraded rockers with bushings. I already have the 660 btr springs on current heads. so i'll reuse the retainers, and spring locators, but install new spings.

ly6 intake with 50# flex fuel injectors.
alexj01_83 is offline  
Old 11-04-2018, 08:44 PM
  #8  
TECH Regular
 
Bspeck82's Avatar
 
Join Date: Jan 2017
Posts: 491
Default

Originally Posted by LLLosingit View Post
You really think all the LS3's at only 376ci spend there life at 5000+, For a budget build 408ci engine the LS3 heads are a perfect match.
Different bore size. Big difference. Valve isn't shrouded like it is on a 4.030.
Bspeck82 is offline  
Old 11-04-2018, 09:16 PM
  #9  
TECH Fanatic
iTrader: (1)
 
Che70velle's Avatar
 
Join Date: Jan 2012
Location: Dawsonville Ga.
Posts: 1,900
Default

Originally Posted by Bspeck82 View Post
Different bore size. Big difference. Valve isn't shrouded like it is on a 4.030.
So your saying that .0175” is a big difference, and that’s why the OP shouldn’t run these heads unless he’s gonna spin it 5k all day? I see your argument on shrouding, but it’s not relevant. The combo works well. I’ve put ls3 heads on two street driven 6liter builds and they make serious torque. GM put the heads on the ly6, in a 3/4 ton truck, because the engines make great torque. I’m putting GMPP cnc’d heads on a 6liter build right now, going in a 4wd truck, street driven for torque.
Che70velle is offline  
Old 11-05-2018, 07:19 AM
  #10  
Restricted User
 
Join Date: Mar 2014
Location: Ohio
Posts: 6,702
Default

Where did you get the rods and pistons?
They look oddly like a set that I had and sold a while back.
Speedmaster pistons?
JoeNova is offline  
Old 11-05-2018, 07:36 AM
  #11  
Restricted User
 
Join Date: Mar 2014
Location: Ohio
Posts: 6,702
Default

Nevermind, just seen you ordered a 408 kit from them. These aren't my pistons then.
JoeNova is offline  
Old 11-05-2018, 02:26 PM
  #12  
TECH Fanatic
iTrader: (1)
 
Kfxguy's Avatar
 
Join Date: Apr 2017
Posts: 1,332
Default

I cant find anything on a speedmaster rotating assembly.....mind tossing in a link? I'd like a rotating assembly for $900 too!
Kfxguy is offline  
Old 11-05-2018, 03:18 PM
  #13  
KCS
Moderator
iTrader: (19)
 
KCS's Avatar
 
Join Date: Mar 2005
Location: Conroe, TX
Posts: 8,317
Default

Originally Posted by Kfxguy View Post
I cant find anything on a speedmaster rotating assembly.....mind tossing in a link? I'd like a rotating assembly for $900 too!
I googled “speedmaster 408 stroker kit” and it was one of the first links to choose from.
KCS is online now  
Old 11-06-2018, 06:29 PM
  #14  
TECH Fanatic
iTrader: (7)
 
Join Date: May 2009
Location: columbus,ohio
Posts: 1,365
Default

Originally Posted by Kfxguy View Post
I cant find anything on a speedmaster rotating assembly.....mind tossing in a link? I'd like a rotating assembly for $900 too!
Jegs has them if you order today it will ship in January !
omc8 is offline  
Old 11-08-2018, 07:51 PM
  #15  
12 Second Club
Thread Starter
 
Join Date: Mar 2014
Location: fayetteville n.c
Posts: 49
Default


Block, heads, and crank should be ready tomorrow.
alexj01_83 is offline  
Old 11-29-2018, 09:19 AM
  #16  
12 Second Club
Thread Starter
 
Join Date: Mar 2014
Location: fayetteville n.c
Posts: 49
Default




So I now have everything I need, building will commence this evening.
So far with rotating assembly, heads, machine work, and all the gaskets i have 4k in it.
that's not bad considering most short blocks are around that price..
alexj01_83 is offline  
Old 11-29-2018, 10:45 AM
  #17  
KCS
Moderator
iTrader: (19)
 
KCS's Avatar
 
Join Date: Mar 2005
Location: Conroe, TX
Posts: 8,317
Default

Damn, $485 to balance that crank?
KCS is online now  
Old 11-29-2018, 11:18 AM
  #18  
12 Second Club
Thread Starter
 
Join Date: Mar 2014
Location: fayetteville n.c
Posts: 49
Default

Originally Posted by KCS View Post
Damn, $485 to balance that crank?
yes, it took some heavy metal. So it took a extra $250.
alexj01_83 is offline  
Old 11-29-2018, 11:22 AM
  #19  
12 Second Club
Thread Starter
 
Join Date: Mar 2014
Location: fayetteville n.c
Posts: 49
Default


alexj01_83 is offline  
Old 11-29-2018, 01:39 PM
  #20  
TECH Fanatic
iTrader: (7)
 
Join Date: May 2009
Location: columbus,ohio
Posts: 1,365
Default

Originally Posted by alexj01_83 View Post
yes, it took some heavy metal. So it took a extra $250.
What was the Bob weight and how much did the rods and pistons weight ?
omc8 is offline  

Thread Tools
Search this Thread

About Us Archive Advertising Cookie Policy Privacy Statement Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: