What to do next on my 383?
Thread Starter
10 Second Club
Joined: Nov 2007
Posts: 458
Likes: 2
From: Birmingham UK
What to do next on my 383? I am awaiting delivery on some Dart 225's, at present i am running Comp Xr275 cam, Comp 1.85 rockers, LS2 intake manifold, 90mm N williams T Body, Straight Through silencers ( X'd), No cats, Emerald 3D Mappable fuel/ign, Tubular Manifolds but they go where they fit, and it cant be altered, not without chopping the chassis anyway, I run a TKO 600 close ratio, and i have just swapped the diff to a 3.08. What non wallet busting mods could add some more pep? By the way JUST upgrading the rockers gave 60bhp@6000rpm, with standard rockers it just dropped off at 5500. Peak overall gain was 35bhp. The heads which i am about to swap are older perimeter bolt LS1 heads, which we cc'd at 68cc. So going to 62cc Dart should give something straight off. We run 98RON fuel here in the UK. I have re asked the question because i cant find my damn thread. Sorry!
I am awaiting delivery on some Dart 225's, at present i am running Comp Xr275 cam, Comp 1.85 rockers, LS2 intake manifold, 90mm N williams T Body, Straight Through silencers ( X'd), No cats, Emerald 3D Mappable fuel/ign, Tubular Manifolds but they go where they fit, and it cant be altered, not without chopping the chassis anyway, I run a TKO 600 close ratio, and i have just swapped the diff to a 3.08. What non wallet busting mods could add some more pep? By the way JUST upgrading the rockers gave 60bhp@6000rpm, with standard rockers it just dropped off at 5500. Peak overall gain was 35bhp. The heads which i am about to swap are older perimeter bolt LS1 heads, which we cc'd at 68cc. So going to 62cc Dart should give something straight off. We run 98RON fuel here in the UK. I have re asked the question because i cant find my damn thread. Sorry!
With those heads you need a much larger cam 24X/24X or somewhere in that range.
Thread Starter
10 Second Club
Joined: Nov 2007
Posts: 458
Likes: 2
From: Birmingham UK
Ok, i'm listening, over here in the UK theres not much no how on these LS's yet! so if i'm correct Standard cam lift is .568 on 1.7 rockers so i am .568 divided 1.7 = .334, this is then multiplied by the new rocker ratio of 1.85= .618 correct? Valve clearnance seems to be reasonably close already, i have had the Dart valves cut back by 0.75mm to be safe ( AMS racing are doing this for me.), but what kind of lift and duration can you get away with, without machining pockets? Thanks.
