GM Engine & Exhaust Performance EFI | GEN I/GEN II/GEN III/GEN IV Engines |Small Block | Big Block |

Need Help understanding Big Block options

Thread Tools
 
Search this Thread
 
Old Mar 11, 2015 | 06:29 PM
  #31  
mvrk10256's Avatar
Thread Starter
On The Tree
 
Joined: Jul 2012
Posts: 117
Likes: 0
From: Austin,TX
Default

LOL. aint gonna be no FI.

Although I am still fairly torn between EFI and carb....
Reply
Old Mar 11, 2015 | 07:47 PM
  #32  
TXsilverado's Avatar
Moderator
20 Year Member
Loved
Liked
Community Favorite
iTrader: (19)
 
Joined: Jan 2005
Posts: 18,368
Likes: 297
From: Humble Texas
Default

run a compression test. if it tests good, run it!


replace the valve seals, crank seal and rear main seal. and any others that might be leaking. I wouldn't even crack the heads off of that motor if compression checks. that's the point of junkyard motors. cheaper than rebuilding and probably more dependable than any rebuilt unit. you have an entire engine for the cost of a new cam. don't blow the budget now


do you know how to tune with HPtuners (doubt it)
tuning a carb is so easy a caveman can do it. tuning efi requires a 4 year degree and you will still go cross eyed with how much information you need to learn. the truck in my sig is a carbed 10 second N/A truck that gets around 20mpg. I have around 1 hour of tune work between the carb and ignitions system (probably more like 30 minutes). I'm sure EFI can get better mileage, but I didn't build the truck to be a gas sipper. if your truck came with pre-installed EFI, I would probably say stick with EFI for the cost.

Last edited by TXsilverado; Mar 11, 2015 at 07:53 PM.
Reply
Old Mar 11, 2015 | 07:51 PM
  #33  
mvrk10256's Avatar
Thread Starter
On The Tree
 
Joined: Jul 2012
Posts: 117
Likes: 0
From: Austin,TX
Default

Originally Posted by TXsilverado
run a compression test. if it tests good, run it!


replace the valve seals, crank seal and rear main seal. and any others that might be leaking. I wouldn't even crack the heads off of that motor if compression checks. that's the point of junkyard motors. cheaper than rebuilding and probably more dependable than any rebuilt unit. you have an entire engine for the cost of a new cam. don't blow the budget now


do you know how to tune with HPtuners (doubt it)
tuning a carb is so easy a caveman can do it. tuning efi requires a 4 year degree and you will still go cross eyed with how much information you need to learn.

Just so happens I do have a 4 year degree in EE and then a Master in Electromagnetics on top of that. I am very familiar with tuning FI. I am just not familiar with the GM specific units. I can wire a MS in my sleep.
Reply
Old Mar 11, 2015 | 07:52 PM
  #34  
mvrk10256's Avatar
Thread Starter
On The Tree
 
Joined: Jul 2012
Posts: 117
Likes: 0
From: Austin,TX
Default

It is however my understanding that HP tuners basically gives you unlimited access to the ECU, get rid of the automatic trans ****, emissions, ect... right?
Reply
Old Mar 11, 2015 | 07:58 PM
  #35  
TXsilverado's Avatar
Moderator
20 Year Member
Loved
Liked
Community Favorite
iTrader: (19)
 
Joined: Jan 2005
Posts: 18,368
Likes: 297
From: Humble Texas
Default

there is still a learning curve. yeah HP gives you a ton of access and does have a nice logging system. EFI is also easier on emission counties. Forgot about that setback of a carb on a truck less than 25 years old.
Reply
Old Mar 11, 2015 | 08:01 PM
  #36  
mvrk10256's Avatar
Thread Starter
On The Tree
 
Joined: Jul 2012
Posts: 117
Likes: 0
From: Austin,TX
Default

Well the body is gonna have to be 25 years old. I live in an emissions county, but I was never planning on running cats anyway.
Reply
Old Mar 12, 2015 | 05:04 PM
  #37  
mvrk10256's Avatar
Thread Starter
On The Tree
 
Joined: Jul 2012
Posts: 117
Likes: 0
From: Austin,TX
Default

Lol. the more I google the more I am falling in love with a 240z or something similar.
Reply
Old Mar 26, 2015 | 10:19 AM
  #38  
mvrk10256's Avatar
Thread Starter
On The Tree
 
Joined: Jul 2012
Posts: 117
Likes: 0
From: Austin,TX
Default

1. Texas Speed is down the road. For $750 I can have my LM7 heads ported, LS1 2" valves put in, and have them reassembled with new seals, valve cut, ect. I can buy a set of stock rebuild LS1 heads for around $450. $750 seems a lot, but I don't have too many options here in Austin. What is the best play?

2. I want to stock NA. I would like to add the 4.8l flat top pistons for a compression bump. Am I going to run into any issues?

3. Building the "right" way. I plan on adding:
-LS2 timing chain
-LS6 ported oil Pump
-ARP head bolts
-ARP crank bolts
-Comp Cams trunion kit (I have this on my DD after bearings failed on 1500 mile road trip).

Am I missing any obvious upgrade?

4.Cam. I am still doing research on this but I want something that sounds great, is very aggressive. in a 3k# car I am not worried about low end grunt. Any suggestions? As well as valvetrain adjustment that needs to be made? I have no decided on springs yet either.

5. Vic JR single plane seems like the way to go. thoughts?
Reply
Old Mar 26, 2015 | 10:57 AM
  #39  
69Camaro427's Avatar
TECH Enthusiast
 
Joined: Sep 2013
Posts: 660
Likes: 0
Default

It usually cost us around 5K to buy and build our 396-454 motors for the camaros and chevelles. However, we have to pay a pretty penny for date matched stuff and building to spec like back in the day. I would say it cost us about 3K to buy all the new parts for the bare blocks. SBC and BBC parts tend to be on the cheaper side compared to Ls motors.
Reply
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
6.0l RST
FORCED INDUCTION
16
Nov 23, 2015 11:30 AM
Alco
GM Drivetrain & Suspension
20
Sep 4, 2015 04:08 PM
spiritfish
New Members
4
Aug 23, 2015 09:58 PM
chevy6.0fan
GM Engine & Exhaust Performance
4
Aug 20, 2015 07:10 PM
ZO6Ted
GMT K2xx Trucks General Discussion
9
Aug 12, 2015 07:50 PM




All times are GMT -5. The time now is 06:55 PM.