cam after ls3 top end
Thread Starter
Registered User
Joined: Jun 2015
Posts: 5
Likes: 0
sorry im a noobie when it comes to everything... im searching for videos on youtube now but i want to buy the heads cnc ported from texas speed most probably, they have an option that comes with the springs already installed. I know i need ARP head bolts and an l76 intake manifold. what else might i need and/or need to do? what is flycutting the pistons?
TECH Fanatic
Joined: Jul 2007
Posts: 1,802
Likes: 333
From: Wilmington, De
You don't need ARP head bolts. They are nice because they aren't one-time use, but they aren't necessary.
Flycutting is using a tool to cut valve reliefs in the pistons. With the right cam selection, this won't be necessary.
Flycutting is using a tool to cut valve reliefs in the pistons. With the right cam selection, this won't be necessary.
The factory LS2 pistons are flat with no valve reliefs and you are changing the intake valve diameter from 2.0" to 2.165" which substantially reduces the amount of piston to valve clearance.
If you go with a smaller cam, say in the 222-226 duration range, you most likely will not need to fly cut for clearance.
If you go with a smaller cam, say in the 222-226 duration range, you most likely will not need to fly cut for clearance.
The LS2 with ported rectangular port heads don't need big cam, a 226 duration @ .050 is awesome don't require piston fly cutting will make easy 470 whp and have street manners and sound great.
Teching In
Joined: Mar 2014
Posts: 8
Likes: 0
I'm looking at an option right now that has a 6.0 block with ported LS3 heads and aggressive cam profile. For a mainly street driven 69 Firebird PT car, whether this would be suitable, as it seems to have been spec'd for higher RPM? The main difference for my setup would be a 3.89 gear with Trutrac.
From info provided:
"w/forged 11.0:1 LFA 6.0L short block, .035” milled 68cc LS3 heads, .040” gasket, LS3 intake w/87mm TB, 1 7/8” long tube headers w/o cats, manual trans, 3.73 gear, 6800 rpm shift points, 7000 rpm rev limiter.
228/234 .649”/.629” 112 LSA +2 advance (with 1.7 ratio rockers)"
This motor also utilizes BTR dual valve springs good for .660" lift and titanium retainers.
Any thoughts??
From info provided:
"w/forged 11.0:1 LFA 6.0L short block, .035” milled 68cc LS3 heads, .040” gasket, LS3 intake w/87mm TB, 1 7/8” long tube headers w/o cats, manual trans, 3.73 gear, 6800 rpm shift points, 7000 rpm rev limiter.
228/234 .649”/.629” 112 LSA +2 advance (with 1.7 ratio rockers)"
This motor also utilizes BTR dual valve springs good for .660" lift and titanium retainers.
Any thoughts??
