Piston to valve clearance ls1 ls6
Thread Starter
Instructor
Joined: Apr 2008
Posts: 245
Likes: 2
From: melbourne florida
Piston to valve clearance ls1 ls6
The specifics: 99 ls1 block,soon to be installed 02 ls6 stock "243 heads". These heads have not been shaved so they are the stock 64cc 10.5 1 heads. I will be using the standard 1.7 rockers w/ hardened pushrods and comp cams 8019 springs w/ titanium retainers. Question arises: is there a cam with duration and lift that is considered acceptable where there would be know concern for valve to piston contact? Im looking at a ecs -220/580 cam a (lg -g5x2 232-240/ 595/608 cam )and a livernois 232/595 stage 2 cam. I understand that duration of cam is a bigger concern than lift but is there a safe "limit" that shouldnt be exceeded without using valve reliefs in pistons and what not? Any info would be appreciated...thanx in advance 
Pro
Joined: Feb 2003
Posts: 623
Likes: 11
From: Ankeny IA
If it says it will work on a stock motor, then it should clear fine. Stock 243's will have the same clearance as your current heads. Any of those cams should work fine. Personally I'd send those heads off to someone like TEA to get some port work done before going through the work to swap them. The 243's are a better head, but not much better. You'll also need stiffer springs than the stock LS6 heads come with to run any kind of an aftermarket cam.
Tech Contributor
Joined: Sep 2005
Posts: 1,731
Likes: 82
From: New Market AL
A stock LS1 or LS6 head will have adequate PTV clearance with 240°+ duration. You don't really have issues until you start milling the heads and/or running thinner head gaskets. With your stock LS6 heads, I would recommend a .040" Cometic head gasket to bump your compression up closer to 11:1.
Team Owner
Joined: Mar 1999
Posts: 22,025
Likes: 192
From: At the beach in little Rhody
Not sure what Comp 8019 springs are, that sounds like an AFR part number. Also, be careful on spring choice if they are true LS6 heads with the lightweight valves. These valves are not as strong so don't over-spring as they are also very light. Use that to your advantage.
Thread Starter
Instructor
Joined: Apr 2008
Posts: 245
Likes: 2
From: melbourne florida
Correct, my mistake,they are the afr springs....One other question to add to the mix....when it comes to pushrods with this setup, is the standard 1.7 used or will I need to measure with the pushrod tool?
Team Owner
Joined: Mar 1999
Posts: 22,025
Likes: 192
From: At the beach in little Rhody
If you don't have pushrods I always recommend buying those last and picking up an adjustable pushrod for $20 and measuring. That way you can be assured of the correct setup. I usually plan thing so that I can take the measurement, place the pushrod order and then keep assembling the motor. Usually by the time I need the pushrods they are there but I work slow and take my time. If you are doing this over a weekend then this won't work.
The AFR 8019's are usually pretty high on the seat, somewhere around 155 lbs and over 400 when open. That may be a lot for sodium filled exhaust valves.
The AFR 8019's are usually pretty high on the seat, somewhere around 155 lbs and over 400 when open. That may be a lot for sodium filled exhaust valves.
Cruising
Joined: Mar 2012
Posts: 11
Likes: 0
From: le mans france
ls6 tfs 215 milled and vrx6
hi there
i want to buy for my 2004 ls6 a pair of tfs 215 milled to 59çç with a vrx6 çam what about the ptv the pistons are stoçk and what about the heads gasket
many thanks
i want to buy for my 2004 ls6 a pair of tfs 215 milled to 59çç with a vrx6 çam what about the ptv the pistons are stoçk and what about the heads gasket
many thanks
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