4.5 stroke in LS stock cam location - LS1TECH - Camaro and Firebird Forum Discussion

Notices
Generation V Internal Engine 2013-20xx LT1
Sponsored by:
Sponsored by:

4.5 stroke in LS stock cam location

Reply

Old 11-16-2017, 04:41 AM
  #1  
Teching In
Thread Starter
 
Join Date: Nov 2011
Posts: 4
Default 4.5 stroke in LS stock cam location

Has anyone used a 4.5 stroke in a tall deck block but with stock location cam? Rotating will now clear block but haven't tried a cam yet. Will a small base circle cam do it or what. Hate to buy a raised cam block if this can work. Anyone done this or failed at this?
catman is offline  
Reply With Quote
Old 11-16-2017, 08:54 AM
  #2  
KCS
Moderator
iTrader: (19)
 
KCS's Avatar
 
Join Date: Mar 2005
Location: Conroe, TX
Posts: 7,865
Default

Originally Posted by catman View Post
Has anyone used a 4.5 stroke in a tall deck block but with stock location cam? Rotating will now clear block but haven't tried a cam yet. Will a small base circle cam do it or what. Hate to buy a raised cam block if this can work. Anyone done this or failed at this?
Yeah, a standard base circle cam is going to hit. What cam and connecting rods do you have?

My 4.250" crank just barely cleared with a .370" lobe cam and Compstar rods.
KCS is offline  
Reply With Quote
Old 11-16-2017, 02:39 PM
  #3  
Teching In
Thread Starter
 
Join Date: Nov 2011
Posts: 4
Default

There is no cam yet but it will need to be around .475 lobe. I have callies h rods but have L10 bolts and can go to 2000 bolts if I have to but the block is clearanced for the L10's now. I would like to find someone who has done this. There may be some rods- high dollar for sure- that will help with this. I think I can gain appox? .140 with a small base cam but it still needs to be a.475 lobe. If I knew how much I needed it would be easier to see where to go. Thanks for reply!
catman is offline  
Reply With Quote
Old 11-17-2017, 08:33 AM
  #4  
KCS
Moderator
iTrader: (19)
 
KCS's Avatar
 
Join Date: Mar 2005
Location: Conroe, TX
Posts: 7,865
Default

Originally Posted by catman View Post
There is no cam yet but it will need to be around .475 lobe. I have callies h rods but have L10 bolts and can go to 2000 bolts if I have to but the block is clearanced for the L10's now. I would like to find someone who has done this. There may be some rods- high dollar for sure- that will help with this. I think I can gain appox? .140 with a small base cam but it still needs to be a.475 lobe. If I knew how much I needed it would be easier to see where to go. Thanks for reply!
The closest I can think of is the 500ci LS2 build that SAM did a long *** time ago. They used an ERL block with the deck plates to make it a tall deck. The cam was small though, but I can't remember if it was a small base circle. I do remember that the rods were secret. No logo or anything on them, but I suspected they were Carrillo.
KCS is offline  
Reply With Quote
Old 11-17-2017, 10:17 AM
  #5  
LS1Tech Sponsor
 
Join Date: Dec 2008
Location: Santa Ana, CA. USA
Posts: 2,077
Default Camshaft Design

Hi All, I suggest a Copper Camshaft with Roller Bearings, Timkens.

I can design this camshaft as I have Andrews Products if Asked ?

My REASON is Lobe Size, the lobe of LS-x engines is Very Large causing HIGH Timken Speed with results of LOWER bearing life.

I have made Copper cams that have the lobe UNDER the cam minor diameter.

I KNOW ALL these cam "gurous" want a standard Base Circle, how DUMB.

The lifter travels inside the block/guide and with to great a Lobe Lift, it travels beyond the designed distance.

My common method is to "center" the lifters travel in it's bore as designed.

Then ALL state "new" pushrods are required, my guess is that the LONGER (reduced base circle) push rod would just cost too much.

Lance
pantera_efi is offline  
Reply With Quote
Old 03-07-2018, 04:46 PM
  #6  
LS1Tech Sponsor
 
TrickFlowTech's Avatar
 
Join Date: Feb 2008
Posts: 290
Default

The ERL 500 was 4.500 stroke with 6.800 length Carrillo rods, The connecting rod's shoulder profile was done to Carrillo's "stroker" recommendation with 7/16 rod bolts.

The engine was modeled and run through 720 degrees with fine detail. Three cam lobes were identified as close. Comp ground some smaller than stock base circle cams that cleared nicely. Although reduced base circle, it was still bigger than many of the BBC lobes of the day and twist wasn't an issue. The lifter bores were bushed and redrilled to ensure proper flow to the lifter's oil band at all lifts.

Horsepower Research has a 527 tech'd out. You could speak to them about a rotating assembly and matching cam perhaps.

With the advent of the raised cam RHS tall deck with it's extra two chain links, the need went away mostly.
__________________
http://www.trickflow.com/emain.asp
Click Above for Product Information

Last edited by TrickFlowTech; 03-08-2018 at 06:52 AM.
TrickFlowTech is offline  
Reply With Quote
Old 03-12-2018, 12:35 AM
  #7  
10 Second Club
 
big hammer's Avatar
 
Join Date: May 2009
Location: over dere
Posts: 2,653
Default

Originally Posted by Pantera EFI View Post
Hi All, I suggest a Copper Camshaft with Roller Bearings, Timkens.

I can design this camshaft as I have Andrews Products if Asked ?

My REASON is Lobe Size, the lobe of LS-x engines is Very Large causing HIGH Timken Speed with results of LOWER bearing life.

I have made Copper cams that have the lobe UNDER the cam minor diameter.

I KNOW ALL these cam "gurous" want a standard Base Circle, how DUMB.

The lifter travels inside the block/guide and with to great a Lobe Lift, it travels beyond the designed distance.

My common method is to "center" the lifters travel in it's bore as designed.

Then ALL state "new" pushrods are required, my guess is that the LONGER (reduced base circle) push rod would just cost too much.

Lance
I would call this guy. Serious
big hammer is offline  
Reply With Quote
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
Dart Tech 1
Generation III Internal Engine
17
05-30-2018 11:54 AM
Pecos Pete
Advanced Engineering Tech
13
04-28-2018 05:06 PM
oscs
Forced Induction
39
04-11-2017 04:48 PM
B4cZ28
Parts Classifieds
0
02-27-2016 04:20 PM


Thread Tools
Search this Thread
Quick Reply: 4.5 stroke in LS stock cam location


Archive Advertising Cookie Policy Privacy Statement Terms of Service

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: