LT1-LT4 Modifications 1993-97 Gen II Small Block V8

block filling

Thread Tools
 
Search this Thread
 
Old Apr 28, 2012 | 08:25 PM
  #1  
nitrous2fast's Avatar
Thread Starter
TECH Fanatic
iTrader: (2)
 
Joined: Dec 2010
Posts: 1,084
Likes: 0
From: Oklahoma
Default block filling

How many have had to do any filling of the block for clearance issues going to a 4" crank??

anybody not had to fill?
Reply
Old Apr 28, 2012 | 09:14 PM
  #2  
96capricemgr's Avatar
11 Second Club
iTrader: (1)
 
Joined: Sep 2004
Posts: 11,975
Likes: 15
Default

A vendor was offering these for awhile and posted some details here like using small journal crank/rods to improve clearance. Do some searching and you will find it and I think it would help.
Reply
Old Apr 28, 2012 | 11:59 PM
  #3  
warriorcustoms's Avatar
TECH Resident
iTrader: (10)
 
Joined: Oct 2011
Posts: 942
Likes: 1
From: Oklahoma
Default

while researching my 396 build I read a good article on chevy high performance about a 396 sbc build & it stated that 4 out of 10 blocks fail the pressure test on a 408 build Yeah stroker rods & such will help but any way you cut it Its still a 4in stroke Find a shop that builds a lot of strokers
Reply
Old Apr 29, 2012 | 12:46 PM
  #4  
fex77k's Avatar
8 Second Club
15 Year Member
iTrader: (2)
 
Joined: Sep 2006
Posts: 1,668
Likes: 2
From: AR
Default

Originally Posted by warriorcustoms
while researching my 396 build I read a good article on chevy high performance about a 396 sbc build & it stated that 4 out of 10 blocks fail the pressure test on a 408 build Yeah stroker rods & such will help but any way you cut it Its still a 4in stroke Find a shop that builds a lot of strokers
After my machinist fit the rotating assembly in my 396, he told me there was enough meat to get a 4" in there. It would be close, but there was very little shift in the block. I don't think you can get ARP L19 bolts to fit so they will have to be something smaller, even the 2000's will be a close fit, but it really depends on the block.
Reply
Old Apr 29, 2012 | 12:55 PM
  #5  
duh's Avatar
duh
TECH Fanatic
iTrader: (16)
 
Joined: Apr 2009
Posts: 1,501
Likes: 2
From: burbs of chi-town
Default

I think most shops recommend a short fill at least. Only to completely make sure they don't hit water.
Reply
Old Apr 29, 2012 | 07:27 PM
  #6  
nitrous2fast's Avatar
Thread Starter
TECH Fanatic
iTrader: (2)
 
Joined: Dec 2010
Posts: 1,084
Likes: 0
From: Oklahoma
Default

I have an ultrasonic thickness gauge but was trying to decide if i wanted to go 3.75 or all out to a 4".... block filling isnt a problem but if many haven't had to fill then i def will go 4".
Reply
Old Apr 29, 2012 | 10:07 PM
  #7  
warriorcustoms's Avatar
TECH Resident
iTrader: (10)
 
Joined: Oct 2011
Posts: 942
Likes: 1
From: Oklahoma
Default

Go for the big 408 IF you have 2nd thoughts go 3.875 instead of 3.75 The 396 combo helps tame those big cams just a LiL better than a 383 Just my 2cents
Reply
Old Apr 29, 2012 | 10:50 PM
  #8  
stevo9389's Avatar
TECH Enthusiast
 
Joined: Mar 2009
Posts: 680
Likes: 7
From: Clearwater
Default

keep us posted on how long it lasts. i have only read rumors that LT1s exceeding 396CI are not long for this world. i know of 2 local 396's that take regular beatings plus street duty that barely break a sweat so knowing those extra cubes are more than a novelty would be nice.
Reply
LS1 Tech Stories

The Best V8 Stories One Small Block at Time

story-0

Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin

 Verdad Gallardo
story-1

6 Common C5 Corvette Failures and What's Involved In Repairing Them

 Pouria Savadkouei
story-2

Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph

 Verdad Gallardo
story-3

Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked

 Pouria Savadkouei
story-4

Top 10 Most Powerful Chevy Trucks Ever Made!

 
story-5

Hennessey's New Supercharged Silverado ZR2 Has 700 HP

 Verdad Gallardo
story-6

Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes

 Verdad Gallardo
story-7

Awesome K5 Blazer Restomod Comes With C7 Corvette Power

 Verdad Gallardo
story-8

10 Camaros You Should Never Buy

 
story-9

10 LS Engine Myths That Refuse to Die

 Verdad Gallardo
Old Apr 29, 2012 | 11:25 PM
  #9  
fex77k's Avatar
8 Second Club
15 Year Member
iTrader: (2)
 
Joined: Sep 2006
Posts: 1,668
Likes: 2
From: AR
Default

Originally Posted by stevo9389
keep us posted on how long it lasts. i have only read rumors that LT1s exceeding 396CI are not long for this world. i know of 2 local 396's that take regular beatings plus street duty that barely break a sweat so knowing those extra cubes are more than a novelty would be nice.
I daily drive my 396 when the weather is nice, I beat the **** out of it no problems. I have LT1s that are .040 and .030 you need to sonic test them if you want to go crazy. You can go .060 but you have to check that. I sonic tested .140" wall thickness between cylinders and .240" thickness the other way. Also my block had almost no core shift.

Some people say .100" is the min wall thickness, however if you hardblok fill it you can make the wall paper and still get "some" runs out of it.

Here is a few pictures of my 396, the machinist had some fun on the rail sides, you don't have to take this much out for a 3.875, but a 4" is another story. I believe this was done on a bridgeport.
Attached Thumbnails block filling-bottom.jpg   block filling-railside.jpg   block filling-camside.jpg  
Reply
Old Apr 30, 2012 | 12:31 AM
  #10  
stevo9389's Avatar
TECH Enthusiast
 
Joined: Mar 2009
Posts: 680
Likes: 7
From: Clearwater
Default

^ i am speaking in terms of exceeding a 396 and holding it together as well as a 396
Reply
Old Apr 30, 2012 | 06:38 AM
  #11  
SS RRR's Avatar
Village Troll
20 Year Member
Liked
Loved
Community Favorite
iTrader: (2)
 
Joined: Oct 2002
Posts: 11,111
Likes: 598
From: Jackstandican
Default

Originally Posted by fex77k
Here is a few pictures of my 396, the machinist had some fun on the rail sides, you don't have to take this much out for a 3.875, but a 4" is another story. I believe this was done on a bridgeport.
Are you running a small base circle cam? What rods?
Reply
Old Apr 30, 2012 | 07:48 AM
  #12  
nitrous2fast's Avatar
Thread Starter
TECH Fanatic
iTrader: (2)
 
Joined: Dec 2010
Posts: 1,084
Likes: 0
From: Oklahoma
Default

^^^ ah.. good question....
Reply
Old Apr 30, 2012 | 07:51 AM
  #13  
fex77k's Avatar
8 Second Club
15 Year Member
iTrader: (2)
 
Joined: Sep 2006
Posts: 1,668
Likes: 2
From: AR
Default

Originally Posted by SS RRR
Are you running a small base circle cam? What rods?
No special cam, its one of Bret's super secret grinds. Rods are off the shelf 6" Eagle H-beams with ARP2000's in them, 4340 Eagle 3.875 crank. The pistons are Mahle.
Reply
Old Apr 30, 2012 | 09:35 AM
  #14  
SS RRR's Avatar
Village Troll
20 Year Member
Liked
Loved
Community Favorite
iTrader: (2)
 
Joined: Oct 2002
Posts: 11,111
Likes: 598
From: Jackstandican
Default

Originally Posted by fex77k
No special cam, its one of Bret's super secret grinds. Rods are off the shelf 6" Eagle H-beams with ARP2000's in them, 4340 Eagle 3.875 crank. The pistons are Mahle.
I can't remember what Eagle rods I had, but the place that built my block didn't want to use them and recommended Compstars. The rod bolt profile was significantly shorter and allowed for less clearancing.
Did you have any problems with using a pilot bearing/bushing with the crank? The hole for a bearing/bushing is oversized on the one I bought (problem with a batch of their crankshafts) and their answer was to use either a knurled bearing or an oversized bushing.
Reply
Old Apr 30, 2012 | 10:17 AM
  #15  
fex77k's Avatar
8 Second Club
15 Year Member
iTrader: (2)
 
Joined: Sep 2006
Posts: 1,668
Likes: 2
From: AR
Default

Originally Posted by SS RRR
I can't remember what Eagle rods I had, but the place that built my block didn't want to use them and recommended Compstars. The rod bolt profile was significantly shorter and allowed for less clearancing.
Did you have any problems with using a pilot bearing/bushing with the crank? The hole for a bearing/bushing is oversized on the one I bought (problem with a batch of their crankshafts) and their answer was to use either a knurled bearing or an oversized bushing.
The pilot bearing wasn't too bad for the eagle crank, balancing the crank was a pain in the *** thou. If I was to do it again, I probably wouldn't buy any eagle stuff. If I didn't have a shop in my pocket it would have cost me a ton of money to get it all balanced out.
Reply




All times are GMT -5. The time now is 02:51 PM.

story-0
Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin

Slideshow: This heavily modified 1971 Camaro mixes classic muscle car styling with a fifth-generation Camaro interior and modern LS3 power.

By Verdad Gallardo | 2026-05-12 18:06:42


VIEW MORE
story-1
6 Common C5 Corvette Failures and What's Involved In Repairing Them

Slideshow: From wobbling harmonic balancers to failed EBCMs, these are the issues that define long-term C5 ownership and what repairs typically involve.

By Pouria Savadkouei | 2026-05-07 18:44:57


VIEW MORE
story-2
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph

Slideshow: A modern Camaro transformed into a retro icon, this limited-run "Bandit" build blends nostalgia with brute force in a way few revivals manage.

By Verdad Gallardo | 2026-04-21 13:57:02


VIEW MORE
story-3
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked

Slideshow: Cadillac didn't just crash the high-performance luxury vehicle party, it showed up loud, supercharged, and occasionally a little unhinged...

By Pouria Savadkouei | 2026-04-16 10:05:15


VIEW MORE
story-4
Top 10 Most Powerful Chevy Trucks Ever Made!

Slideshow: Top ten most powerful Chevy trucks ever made

By | 2026-03-25 09:22:26


VIEW MORE
story-5
Hennessey's New Supercharged Silverado ZR2 Has 700 HP

Slideshow: Hennessey has turned the Silverado ZR2 into a 700-hp off-road monster with supercharged V8 power and a limited production run.

By Verdad Gallardo | 2026-03-24 18:57:52


VIEW MORE
story-6
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes

Slideshow: A one-off sports car that looks like a vintage Italian exotic-but hides a C6 Corvette underneath-just sold for the price of a new mid-engine Corvette.

By Verdad Gallardo | 2026-03-23 18:53:41


VIEW MORE
story-7
Awesome K5 Blazer Restomod Comes With C7 Corvette Power

Slideshow: A heavily reworked 1972 K5 Blazer swaps its off-road roots for a low-slung street-focused build with modern V8 power.

By Verdad Gallardo | 2026-03-09 18:08:45


VIEW MORE
story-8
10 Camaros You Should Never Buy

Slideshow: There are thousands of used Camaros on the market but we think you should avoid these 10

By | 2026-02-17 17:09:30


VIEW MORE
story-9
10 LS Engine Myths That Refuse to Die

Slideshows: Which one of these myths do you believe?

By Verdad Gallardo | 2026-01-28 18:10:11


VIEW MORE