Project Bad Penny - more changes because done is boring

[John Wright]

That flywheel and clutch arrangement is sweet looking.

[Bryce]

I cant wait to see the new penny at SEMA.

[gearbanger]

4.155 bore
4.250 stroke

Cool, that is exactly the same as my Pontiac 461

[formula98]

How did it do on the dyno?

[Steve1968LS2]

How did it do on the dyno?

[Gandalf]

I also switched to Centerforce's new twin disc clutch.. now typically I'm against these since they are more of a PITA than helpfull, but we installed this on our 2010 Camara and it was both stupid easy to install and felt like a stock clutch in the car with zero rattles or issues.

The flywheel is steel but the edge has been lightened and from a MOI standpoint is equal to an aluminum unit without the associated problems. Should hold up better to the power and to how I drive.

That is one nice looking Centerforce. Few questions for you: What material are those discs? Do they give a hold-rating? F/W weight? Running the same pressure-plate or is it a "kit" that all comes together? Any pics of the other parts? Was there an article on the 2010 fit I can check out?

I know you were happy with the single disc Centerforce setup in Penny so this should be even better under "those conditions" LOL!

G.

[gearbanger]

Wow, that is going to be a hoss!

Just out of curiosity, could you give me some idea of the cam specs, solid or hyd roller, compression, and head flow?

[xxxturbo6]

Steve,

What are you doing for oiling?

I see a bunch of people talk about a Dry-sump set up for doing road courses but I don't see a bunch here doing it, How come?



Scot W.

[gearbanger]

Wow, that is going to be a hoss!

Just out of curiosity, could you give me some idea of the cam specs, solid or hyd roller, compression, and head flow?

Pretty please?

[formula98]

Awesome! The G's she'll deliver will be mind bending! I can't wait to watch her run again......

[Steve1968LS2]

Pretty please?

Sorry.. swamped here and going to St Louis for a few days (work)

247/263 lift of .624 and the LSA is 114 (installed at 111 but we installed it at 110.5)

I don't have the head flow but with our 30 degree back cut valves I remember:

250 193
300 231
450 316
550 348
600 360
650 372

I think we could have made more CFM messing with the valve profiles more but these are good flow numbers where we need them.

[gearbanger]

I am assuming a solid roller, and I think I found where the compression was about 11.5:1 , is that correct?

That cam should be pretty nice. Will it be 93 octane friendly, or will it need a little boost?

[Nessumsar]

Knowing what Steve wanted from this engine I would have to assume that it has Hyd lifters, and runs on 91 octane.

That thing is a beast!

[Steve1968LS2]

I am assuming a solid roller, and I think I found where the compression was about 11.5:1 , is that correct?

That cam should be pretty nice. Will it be 93 octane friendly, or will it need a little boost?

Hydraulic.. solid is for race cars

Yea, 11.5 -- we were targeting 11.3 but the head gasket ended up being 41 compressed instead of the more common 51 for a GM MLS.

Ran it on the dyno on 91.. but im sure it would be happier on the 93 instead of the crap gas we get in CA.

[gearbanger]

Man, that really is impressive. Did you have to use titanium valves and/or retainers to get it to rpm like that with a hyd roller? What size are the intake valves?

[Steve1968LS2]

Man, that really is impressive. Did you have to use titanium valves and/or retainers to get it to rpm like that with a hyd roller? What size are the intake valves?

Ti retainers.. hollow stem stainless valves. Couldn't get the Ti valves in time. Might retrofit them later.

The key was running stiff enough springs. Most of the time they are too soft and that doesn't help float. I these are 420 lb..

Intake valves are 2.20 inch.. pretty damn big.

[Scott Parkhurst]

Dude. Seriously!

[twosaturns]

wait, almost 720hp on a natuarally aspirated LS? seriously?
I have to change my pants...

[gearbanger]

That is totally awesome. I have had trouble getting a hyd roller to rpm much above 6000 with a 2.15 intake valve, but I haven't gotten into light retainers or bee hive stuff yet. I wore a set of springs out pretty quick. Once they float once it is really hard on them and they won't take much of that it seems.

[Steve1968LS2]

Dude. Seriously!

Gotta keep up with the wagon!!!! lol