"Stock Internals" Build
They keep oil off of the cam which reduces rotational losses (free HP).
Could this be done on a daily driver application, I suppose its find for a HR since your using the stock cam.
Any downsides to this?
I have blocked the returns on every LTX race motor that I have ever built and have never seen any kind of wear or failure as a result. That is with both stock lifters and modified stock lifters (both at over 7000 rpm).
Last edited by GIZMO; Jun 21, 2008 at 05:27 PM.
Closed up the LT1 today.
The stock LT1 oil pan was replaced with a 1997 Vortec truck (5 quart) with the baffle removed. We will only be running 4 quarts of oil. The extra pan capacity will reduce windage.
The front cover had to be slightly clearanced for the timing chain.
Note that the stock push rods were replaced with chrome-moly ones from Comp. The rockers are adjusted to one turn past zero lash.
The stock LT1 oil pan was replaced with a 1997 Vortec truck (5 quart) with the baffle removed. We will only be running 4 quarts of oil. The extra pan capacity will reduce windage.
The front cover had to be slightly clearanced for the timing chain.
Note that the stock push rods were replaced with chrome-moly ones from Comp. The rockers are adjusted to one turn past zero lash.
Last edited by GIZMO; Jun 28, 2008 at 04:42 PM.
Because that is the factory spec. and it worked pretty good for me in the past. That doesn't mean that we won't try other lash settings, but I think that it is the right place to start.
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IMO those preaching no preload find it works better because the valvetrain is out of control and more preload just means more float, they take away all the preload to reduce the height of the float.
Should be noted tht thread count on the studs affects the preload for a given amount of turn. 7/16" studs have fewer threads per inch than 3/8" so one full turn on a 7/16" stud is more preload.
Off topic. I am in town this week and should actually get your fuel rails done.
Depends on the cam, I know in some race engines they intentionally float over the nose which could be used to gain lift, BUT it seems some of the popular crap guys put in LT1s actually likes to bounce/float off the seat. I am no racer but I don't think there is ever a case where floating off the seat is beneficial.
Launching!
Joined: Mar 2003
Posts: 284
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From: Michigan
What are your plans for an opti? 
I run the stock windage tray that mounts to the main caps. The Vortec pan has a long wingdage tray/baffle that has to be removed to work. You just have to grind down a few spot welds to get it out. There are two different Vortec pans. Make sure that you get the high capacity one.
When I am an old man (50's) young people probably won't even want to be associated with me any more!!
Take Care,
Daren
Thanks. But I have to say that I get more out of it than I put in. So far, working with these guys has been a bunch of fun. I am really looking forward to seeing them go down the track for the first time.