Been doing some reading here, and have narrowed it down to 2 choice. Either a comp cam kit K12-256-4, or a K12-262-4 kit. I'm looking for a little more power, and still be very much drivable. Now sure how the 262 would idle in my car as it's a 305, but I'm also not looking for to much of a lope either as it may interfere with things like power brakes. Which one would you guys recommend, and what kind of power increases would I expect to gain with it? Would anyone know where there is a sound clip of either one of these cams in an LB9? There's a guy on ebay selling these kits for $289, so it's not a bad deal. What do you think fellas?

 

I'd do the 262 kit. It's got a little more top end, and would idle well with 114 LSA. With your 1.6 rockers you'll have nice lifts too. I'd guess either cam would give a 15 HP gain with stock heads. Probably would get twice that if you ported the heads.

Your NA 1/4 mi. time and MPH seems slow to me. Are you running too rich at 49 psi fuel pressure? My LB9 likes 46 psi, and that's with S/R 305 heads which flow more than stock. Oh, but I have 22 lb injectors....

Maybe you need a 3" catback too?

 

Thanks for replying bud. Now you hurt my feelings about it being slow I know some work to the heads will improve things, but I really don't want to go that far with a 305 as I'm eventually planning a 350 for it when funds permit. I'm also not to sure about the 1.6 rockers with that cam as I read that I might run into some spring problems with the 262's .470 exhaust lift. I guess I could get the .050" locks and a shims to make it work. I haven't played that much with the fuel pressure, but it seems to run good at that pressure on the 19lb injectors. Think I'd have to do any prom work with that cam, or would I be alright with what I have now?

 

Good call, with those rockers you'd be at .501 lift, too much for stock heads. I guess that you could put the old stock rockers back on, or buy another set of 1.5's.

Sorry if I made you feel bad. It just seems to me that a stock TPI with 1.6 rockers, headers, exhaust, and 3.2x gears should be a little faster, say 14.5 @ 95 MPH... but what do I know....

AS far as PROM work goes, I think that with the 114 LSA that the 262 has you'd be ok. Probably just continue using the Hyper chip.

 

Yeah most likely I'll get a set or 1.5RR, and get rid of the steel 1.6's. The stock cam in my 85 is better than the peanut cam in later years, but I think the 262 should wake up this motor abit. Any guess on what kind of an improvement it would make on my times? I'm kinda hoping for something better than a 14.5 I'm at the track maybe twice a year, and what I'm mainly looking to get is more usable power on the street with a slight idle sound.

 

I'm told that a 1.0 sec. improvement takes about a 100 HP gain. With that as a guideline you'd need about a 40 HP gain to get to a 14.5

Now that I'm thinking about it, have you tried using the stock chip at the track? I don't know squat about Hyper chips, but isn't a Stage 3 made for more mods than you have?
I wonder.....

 

When I bought the chip years ago, Hyper told me that I would need to remove the cat and install a 160* thermostat due to it being an "offroad" chip. That was all the mods that were required to use it. The car was bone stock at the time, and running 15.8-15.9 et's LOL. The chip made a HUGE difference in power after I installed it. So if I pick up about 15-20hp with the cam, I'm looking at a .2second increase in the quarter? Sound like a lot of work to only pick up a couple of tenths.

 

i got that cam in my car and i like it... you just need a stall while your doing it..... i would recomend a 3000 stall.... kinda a dog off the line but gets past 2500 rpm tires go in smoke.... has WAY better top end... i also have 1.6 rockers on it to.... idles smoother than the stock cam... look for my sound clip in the exhaust section....under magnaflow.... the cam would do real well with ported heads and intake...

 

Damn Roachjuice, that thing sound amazing!!! Your car was probably the same original powertrains as mine with the excepting that the Iroc got a little more rear end gearing I think. How is your car in the lower rpm range with that cam? Does it at least make the same power as the stock cam in the <2500 range? Reason I'm asking is that's where the motor spends most of it's time driving on the street.

 

like i said its a dog below 2000 rpm.... and thanks on the comment... i think it sounds like no other third gen.... if i had to do it over again i would port the heads and intake.... i think i would be happier with that... but im selling the car so it doesn't matter to me anymore....