1.85 rockers?

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Feb 17, 2005 | 01:48 PM

CaptainCrunch

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Pro

Joined: May 2004

Posts: 532

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From: Tucson, AZ

1.85 rockers?

Anyone know the benefits (i.e. power increase) of installing a set of 1.85 rockers on my 2001 C5? It's a M6 with 4.10 gears, borla, blackwing, spec II clutch and aluminum flywheel...Thanks!

Feb 17, 2005 | 06:43 PM

cbota

Racer

Joined: Jan 2003

Posts: 252

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From: northern nj

Quote:

Originally Posted by CaptainCrunch

Anyone know the benefits (i.e. power increase) of installing a set of 1.85 rockers on my 2001 C5? It's a M6 with 4.10 gears, borla, blackwing, spec II clutch and aluminum flywheel...Thanks!

I installed them on my 99 with mildly ported ls1 heads, I also had prt exhaust and ls6 inake with stinger airfilter. I dynoed at 338rwhp and 338rwtq. This was with LS6 exhaust manifolds and A/F was 11.7.
Probably could have got 345hp with a leaner af and 355-360 with header. I just removed the 1.85 Rocker and installed a TR224/114 cam and dynoed at 370hp and 361tq. I still need to tune the car so that should put me at about 380hp, so basically with the same setup I picked up 25rwhp from the 1.85 to the 224/114 cam. Also mine is a M6 and I may be selling the 1.85 SLP rockers if you are interested.

Feb 18, 2005 | 03:11 AM

loudsam

Burning Brakes

Joined: Feb 2004

Posts: 831

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From: Country Boys Can Survive.

Quote:

Originally Posted by CaptainCrunch

Anyone know the benefits (i.e. power increase) of installing a set of 1.85 rockers on my 2001 C5? It's a M6 with 4.10 gears, borla, blackwing, spec II clutch and aluminum flywheel...Thanks!

I've been interested in the 1.8 Crane rocker set. If you search, especially on ls1tech, you'll find quite a bit of info about it. The idea is appealing to me. I don't see myself being happy with my car if it doesn't idle well, or if it is such a rough idle that it has to be raised 100 to 200 rpm's, in which case a bigger torque converter would be needed. But, I don't race my car at all, except for just messing around a little at stoplights. People seem to be getting good power/lowend torque increases with just a set of ported heads, and some basic bolt-ons and 1.8 or 1.85 rockers, and headers are good, (I'm installing those myself next week), But, if you do want "big" power increases, you must cam the car! Which, I haven't done with this car, but I don't think it would be that difficult if you have the tools/time/garage/patience/etc. I love my car, I don't even KNOW why I want to mod it. I must be obsessed!

Feb 18, 2005 | 07:53 AM

YO-EL

Race Director

Joined: Oct 1999

Posts: 17,710

Likes: 1,219

From: Phila PA, Bonita Springs FL

You'll get about 10% more lift...
Good for 10-20 RWHP & TQ......
On my car (A4), I got 7 RWHP & 10 RWTQ out of the SLP 1.85 rocker/spring package.

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