Lifter opinion
Thread Starter
Teching In
Joined: Dec 2010
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Lifter opinion Comp magnum
gmpp caddy
gmpp ls7
Help me out here I just bought a regrind cam. XR288 238-242@ .050 with
.580-.590 lift 108lsa. Going in a 05 carbed LQ4 with 799 heads, prolly gunna mill .030-.040 off. Also with stock dished pistons ne1 know if i'll have to flycut?
Neways just wanted to see some lifter advice. Thax
gmpp caddy
gmpp ls7
Help me out here I just bought a regrind cam. XR288 238-242@ .050 with
.580-.590 lift 108lsa. Going in a 05 carbed LQ4 with 799 heads, prolly gunna mill .030-.040 off. Also with stock dished pistons ne1 know if i'll have to flycut?
Neways just wanted to see some lifter advice. Thax
Stock lifter sound good for your setup , the LS7 's are the stock replacement lifters now ,and are a good performance lifter as well, .but go to the dealer or a sponsor on here to get them , Most of the parts store around town will sale you what ever they have that will fit your engine.
Thread Starter
Teching In
Joined: Dec 2010
Posts: 29
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When you say "stock" you mean "new stock" right? This 6.0 has 106k on it. If I were 2 lazy & didnt feel like flycutin, how much milling is safe? While i'm having the heads milled how much HP can be gained from a valve job on 3gen heads? As you can prolly tell this is my first LS...
Yes, New stock style lifters , No body really know how much to fly cut, Its best to clay the piston to valve clearance ,I beleave the min. piston to valve clearance is .100" on the intake & .080" on the exhaust valves
.080" on intake is safe, .100" exhaust. exhaust clearance is usually not a problem with a mild cam.
A cam with a 108LSA is going to have the valves ALOT closer to the pistons at and around TDC on overlap, than a cam w/ 114 like what I have in my 6.0 dish piston engine right now. Your 238/242 cam has more duration than my cam as well, which give me more PtoV than you. I have not milled heads at all and I am at .120" on the intake .280" exhaust.
All this lead me to beleive that you are going to be very close to contact without milling at all.
Bottom line is you HAVE to check it yourself to know where your at.
Barrett
A cam with a 108LSA is going to have the valves ALOT closer to the pistons at and around TDC on overlap, than a cam w/ 114 like what I have in my 6.0 dish piston engine right now. Your 238/242 cam has more duration than my cam as well, which give me more PtoV than you. I have not milled heads at all and I am at .120" on the intake .280" exhaust.
All this lead me to beleive that you are going to be very close to contact without milling at all.
Bottom line is you HAVE to check it yourself to know where your at.
Barrett
Thread Starter
Teching In
Joined: Dec 2010
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3pedals.. what exacty are your specs....I use lightspring method with a degree wheel 2 check p2v clearance. I think i'll take the stock head gasket & mic it. Set head back on check p2v & that should give me I decent idea??? Also have a good friend that works @ a machine shop who was talking bout taking care of me for cheap .. Like 1300 for pistons/rods/rings bearings/machine work..Hard to decide weather to slap it together w/rod bolts/cam/heads or wait a lil longer. Again ne idea on hp gain from a valve job???
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