Notices
Generation IV External Engine LS2 | LS3 | LS7 | L92 | Bolt-Ons | Intakes | Exhaust | Ignition | Accessories
Sponsored by:
Sponsored by:

Anyone ever use the LY6 VVT cam in a 4.8/5.3?

 
Old 06-17-2019, 09:51 PM
  #1  
TECH Fanatic
Thread Starter
 
Join Date: Jul 2013
Location: Portland, Oregon
Posts: 1,882
Likes: 0
Received 1 Like on 1 Post
Default Anyone ever use the LY6 VVT cam in a 4.8/5.3?

I was wondering if anyone has bothered using the cam out of the LY6/L96/L92 and put it one of the smaller VVT motors (L20, LH9, LMF).

I know it's designed for rectangle port heads and has 12* of exhaust bias, but the ever-popular LS2/6 cam has 14* of exhaust bias so it's a non-factor.

The LY6/L96/L92 cam is a 196/208 116LSA .467"/.479" with 1.7 rockers... goes up to .508"/.521" with 1.85 rockers... which is essentially the 1998-2000 LS1 cam, but with VVT.

If anyone has done this, I would love to hear how it turned out.
DavidBoren is offline  
Old 06-17-2019, 11:19 PM
  #2  
TECH Senior Member
 
Join Date: Jun 2016
Location: Central Cal.
Posts: 10,901
Received 36 Likes on 35 Posts
Default

I'm no expert, but don't see why it would not work.
According to the Summit specs site, the L92 is 198/209, .500/.500, 115LSA. Just sayin'...
G Atsma is offline  
Old 06-18-2019, 09:07 AM
  #3  
TECH Fanatic
Thread Starter
 
Join Date: Jul 2013
Location: Portland, Oregon
Posts: 1,882
Likes: 0
Received 1 Like on 1 Post
Default

I've seen the specs listed as 198/209 .500/.501 before, too. Either way it's an improvement over the 4.8/5.3 cam, and I would honestly be surprised if nobody has tried it in the smaller engines. It doesn't seem like it would be that bad with the 1.85 rockers.
DavidBoren is offline  
Old 06-18-2019, 10:09 AM
  #4  
cam
TECH Junkie
iTrader: (9)
 
Join Date: Apr 2004
Location: in the garage
Posts: 3,200
Likes: 0
Received 0 Likes on 0 Posts
Default

I'd steer clear of increasing rocker arm ratio on LS engines. Its the flaw of the LS7 head and why they drop valves and eat guides. Regarding the cam swap its something I did consider once as I have a pile of stock L92 cams now but you can purchase one of the summit truck cams for low cost now that will perform substantially better albeit non VVT. If your looking for gains? Add cubes its about the same work as swapping cams and a lot easier imo as you can dress the new engine on the stand and re/re in one easy day and you'll make tons more jam.

As with any performance program its important to set goals out before you start. I could see you gaining 20-30hp up top on a 4.8 with the L92 cam but I think it will suffer down low.
cam is offline  
Old 06-18-2019, 01:44 PM
  #5  
TECH Fanatic
Thread Starter
 
Join Date: Jul 2013
Location: Portland, Oregon
Posts: 1,882
Likes: 0
Received 1 Like on 1 Post
Default

I know it's always better to let the cam do the work, not the rockers, but I didn't realize it was that detrimental to up the rocker ratio.

I was even thinking that you could increase the diameter of the roller on the lifters, as well as increase the rocker ratio, in order to spice up the cam. It's a good idea to replace the lifters anyways, might as well increase the roller diameter.

Obviously could just get a spicier cam custom made, I like the idea of seeing what the factory cams are capable of. I doubt that 1.85 rockers and 0.80 rollers will be enough to interfere with the functionality of the VVT system or PTV clearance given how tame the factory cams are.
DavidBoren is offline  
Old 06-18-2019, 02:42 PM
  #6  
cam
TECH Junkie
iTrader: (9)
 
Join Date: Apr 2004
Location: in the garage
Posts: 3,200
Likes: 0
Received 0 Likes on 0 Posts
Default

Good luck with all that
cam 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: