High revvers

[Blinky]

For you guys running your engines up to 6500-7000rpm, what sort of changes have you made to your valvetrain? I know some of you guys have the LS1/LS6 springs swap, but is there anything else?

[Wolf]

Re: High revvers

For you guys running your engines up to 6500-7000rpm, what sort of changes have you made to your valvetrain? I know some of you guys have the LS1/LS6 springs swap, but is there anything else?

I had a comp custom grind cam & comp springs & high compression, and it ran to 7k fine,and made power all the way to it aswell
the mod list from when I got the car

[Kreb]

Hey Wolf! Have you dyno'd your 3.4? I'd like to know what sort of figures that setup would get you. (Sounds sweet)

[Blinky]

What about people running the 3X00 heads? Do you use mech. or hyd. cams? Stock of aftermarket rockers?

[v6h.o.]

I'm running a Comp Cams Hydraulic flat tappet bumpstick, lifters, and magnum roller tip rockers (1.6:1)

stock valves, stock pushrods.
LS1 valves/retainers/locks.

[TheProfessor]

what compcam are you running colin

[v6h.o.]

16-233-4, 260 adv dur, 212 dur @ .050, .440 lift, (.469 with my rockers)

Summit Racing Catalog Part number: CCA-16-233-4

[TheProfessor]

have you thought about getting a more agressive cam

[oil pan 4]

I have a Crane cams 2-272-h cam with cranes 1.6 RR's on the intakes and 1.5's on the exhausts. duration @ .050 is 216*/228* with .481''/.480'' of total lift (rockers acounted for).
I have Titanium 1.25'' retainers, forged 7 degree locks kmotion K-700 springs.
I only want to turn it 6500 at the most I think.

http://www.cardomain.com/id/oil_pan_4

I have pictures.

[TheProfessor]

how do you like your crane 272
what compression are you running

[dbtk2]

I have a completely stock bottom end, stock compression, etc.... Crane H-260 Cam/Lifters, .427/210 Intake, .454/216 Exhaust, stock pushrods, stock rocker arms, Rebuilt 3100 heads with valve job. I turn mine to my 6200rpm limiter, but it still wants to pull at that point, so I want to raise the limiter to 6500. I'm probably going to get some better valvesprings before I do so, I also have some Comp Cams 1.6 roller tip rockers in my garage that I will be putting in (bringing lift up to .455" Intake and .484" Exhaust) in the very near future.

Shawn

[oil pan 4]

I don't have a block yet, I am waiting so when I go back to the states I can get the engine with the full 3yr warrantie and not waste a year or more from it just sitting.
I will run about a 8.8:1 to 8.9:1 because of the volume added to my chambers. And it's going to be an FI engine.

[oil pan 4]

I have 1.6 rockers for the intakes and 1.5 for the exhasuts also.

[82-T/A [Work]]

What is the benefit of having 1.6:1 roller rockers for the intake, and 1.52:1 roller rockers for the exhaust?

Wouldn't you want 1.52 or 1.6 for all of them? Why would you mis-match the set?

I'm not downing it, just trying to understand. I'm wondering if that's something I should do?

I'm trying to improve mid to upper RPM power in my 3.2 (V6/60 with 3.1 crank / rods in a 2.8 with .040 overbore pistons). I am using a stock 2.8 Fiero Intake manifold.. ported with the throttle body 47 up to 52mm and I've smoothed out the side and tried to enlarge the inside as best as I could.

I'm also considering using the H272 cam. Or the 260.. not sure which yet.


Thanks!!

[TheProfessor]

]What is the benefit of having 1.6:1 roller rockers for the intake, and 1.52:1 roller rockers for the exhaust?

Wouldn't you want 1.52 or 1.6 for all of them? Why would you mis-match the set?

youd be suprised
there are even SBC build combinations where it is better to have different ratio rockers on different cylinders
odd as it might seem