93Polo

That would be my route and if I wanted it set on kill, the C5 parts section has a set of Mamo ported Trickflow casting 265 runner LS7 heads set up for a solid roller. You could turn some big power on a solid roller 427 or 440

_zebra

don't most folks take the 243s OFF of their LS2s to put LS3 heads on (and make more power doing it)? what drove your concept?

REVHARD

I think the big port ls3 heads are a simple and cheap upgrade for some guys to make more power. But some folks have full CNC 243 or 799 heads that provide better flow numbers. From what I've seen, yes, a stock ls3 head trumps a stock 243 head in terms of flow obviously. But I'm not so sure on quickly tossing my Katech CNC true LS6 243 heads in the for sale section for a stock ls3 head.

I think it's all about the entire combination. I personally would not run a 243 on a 416 ls3 stroker. But I think owners which spent a considerable amount of money into GM cathedrals might be just fine on 376 cubes. Especially for some that put a hole in their blocks and have bad *** cathedrals with Fast intakes. Why not just swap in a lower ls3 and be done with it?

RocketRod

I actually did this, but it was based on cost. I went with a Texas Speed CNCd GM LS3 head & cam package with a stock LS3 intake, versus going all out with a set of cathedral port TFS 220s and Fast intake. I would have made more power with the TFS setup but it was going to cost about $1500 more. With the TSP setup I made 445rwhp through a 4l70 and the car has excellent street manners.

crimlwC6

I did an ls3 block with stock ls6 heads with lg cam road race cam, stock ls6 intake. 410 hp, which was my goal. Obviously lots of low and mid engine grunt. I've look for a video.

crimlwC6

heavychevy

You will still likely need aero to be competitive. I'd definitely that first. At least you have a chance on the smaller tracks with less straights.

REVHARD

You are 100% correct. I've been looking into differnet options for quite some time now.

Scooter70

If you're ready to lay the radiator forward, Lee has a C5 front fascia with a splitter already built into it that he's not using.

REVHARD

check your PM's...I have Lee's cell number but I lost my phone this morning...rather I should say my 3 year old walked off with it and it's on silent. I'm still grooming my entire property for it lol

Torque Obsessed

Sorry if I'm bumping an old thread, but I did something similar. LS3 block, forged pistons, stock LS6 heads, cam, ported LS2 intake, headers. Hit 414whp and was super torquey but hit a wall above 4,500rpm. Crazy strong motor that couldn't breathe. With better heads it would have been amazing; that setup probably left 50+ hp on the table. I wound up shifting at 5K.

Way more fun on the street than my cammed LS6 was, but not an optimal result if you're looking for a track setup to compete with faster cars on the straights.

_zebra

yeah, a n/a motor with good top end is better for road racing than a pd blower... but that blower ain't a terrible option for mostly street use that sees road courses. it makes consistent-enough torque that without excellent aero & tires, you won't be too much into the throttle anyway.