AI 230/238

[NightTrain66]

The 230/238 cam would get you more power above 5500 RPM for sure and cost a lil power below 3000 RPM.

Just think about how long and how often the engine is below 3000 and how long and often it is above 5500 RPM.

If you go to the track often or race other areas or are just wanting a higher dyno sheet, the 230/238 is a good choice.

If you are mainly street driving and very seldom ever take it above 6000 RPM, you will probably be happier with the extra few ft lbs of TQ down low with the 226/234 cam.

Lloyd

[JoeliusZ28]

here is my current dyno sheet. This might indicate why im hesitant to mess with anything at all This power curve has been GREAT for autocross, road racing and street. Its very predictable and can pull for a long stretch. Ideally id like to take the whole thing and shift it upwards, but i know thats not realistic with a constant bore size.




And this is 97pontta's sheet. It looks like both of us are making 350rwtq by 3000 rpm, is there really be that much loss down low? is the rounded torque curve a result of better heads? Seems like the curve of LS cars look more like this one. If I upgrade heads and keep the 226/234 is it going to extend my curve out further or will mid range be affected as well?

[JoeliusZ28]

Also to answer an earlier question my gearing is stock. I will not change that until i upgrade to a better rear end. I have beat the snot out of the stock axle and it hasn't complained once, so i'm not going to mess with it. The minute i do is the minute it will break. It does good on the road course right now, but on the street the only gear thats really useful is second. First never hooks, and if i even get into third im already way over the speed limit

[NightTrain66]

yep, just get the heads done and it would pull to a higher RPM up top while still having great TQ in the low/mid range too.

You would probably make peak HP around 6300 RPM or so and it will hang on til 6500-6600 RPM with the 226/234 cam and ported heads.

Lloyd