neat

I finally managed to snag a modified LT1 intake for my L98 off the classifieds on the corvette forum. I am going to do a cam swap at the same time as the intake. I have some GM 1.6 roller rockers, and some LT4 valve springs laying on my bench that will go in with the cam and intake. I burn my own chips, but I live withing about 10 minutes of Alvin from PCMforless.com so if I get in over my head I can go to him to rescue me.

Anyway, I need some cam suggestions. The car doesn't need to pass emissions, but it does need to drive well. My girl drives the car often, and I can't have the car stalling at light's with the AC on or anything. Some rumble is OK, but driveability needs to be there.

I was thinking of using the LT4 hotcam, but I hate the idea of leaving power on the table. The CC305 is also on my mind. A couple guys from the vette forum are recommending the LPE 219, or the ZZ9.

I don't want to spin the engine past about 6,000 to see peak power.

Thought's?

gmgod

comp xr269hr with matching springs.

neat

This one?

Cam

@ZZKKER

iTrader: (1)

try this one. its what i have in my 355 with 1.6 pro magnum rr, but i also have sportsman 2 heads to go with it. all i can say is it sounds mean and has kick behind it, how much i dont know yet as the car is still in the bodywork phase.

tgo wont let me post a link to summit racing

so here is the part number CCA-08-503-8

it says it is not for use with computer controlled cars, but on comp's web page catolog it said it was specificly designed for the tpi electronics. comp also recomends a 2800 stall with cam (but that zf of yours makes me jelous) when used with an auto.

happy hunting.

neat

That's a good idea, it's one step more aggressive than the cam listed above. My heads are the stock ****, and only flow 195 or so. I don't know how much there is to gain using a cam larger than the one already suggested.

I will definitely look into the 503 though.

@ZZKKER

iTrader: (1)

the 503 is a good cam for the peak hp to come at the rpm number you require (6000rpm), so you would peak around 5700 to 6000rpm with a stock size rocker arm, but i recommend the comp pro magnum roller rocker regardless of what size you use.

does your vette use the better aluminum heads or the early style ones? if it uses the early style, i would also recommend an upgrade to a set of the newer l98 heads (you can find them for sale pretty cheap, 600-$900 range) that were also used on the zz4 crate engine. another cheap option would be to do the complete lt1 head and intake swap described in the sticky on the tpi forum.

or you can buy a good set of afr 190 or 195's or trick flow heads.

just remember to match all your parts and you will be much happier with your results.

neat

The vette has the better aluminum L98 heads, but the flow numbers aren't great. Like I said, 195 or so at .500 lift. I can't afford heads right now, so the heads are staying on the car. I am trying to put a package together with what I have:

The LT1 intake modified for the SBC
LT4 roller rocker
LT4 valve springs (I'll buy better springs if I have to)
??? cam

I want the car to peak at about 5700, I don't want to rev past 6k. Ideally, I'd make peak power at 5700, shift at 6000 and pull through that power band with each gear. With the 6 speed I lose about 1,000 RPM's with each gear shift, so I want to maximize the 5000-6000 window where I'll be most of the way down the track. I need to fool with a desktop dyno program and see where the peak power comes in with both cams. If I make peak power at 6k with the larger duration, then I want to step down a bit so the power comes in sooner, even if the peak HP numbers are a little less.

Thanks for the advice man!

camarodarrell

I'm going to run an LT1 intake in a 1991 Z28 with 355 cu in. Stock heads, and a comp cam that is 220 int./230 exh. with .510 lift on both. With the stock heads weak exhaust ports, you want to run a cam with 8-12 degrees more exhaust duration so the exhaust valve stays open longer.

jconrad

Why not just use the LT4 Hotcam with 1.5 rockers for .492 lift? They are supposed to be good to 5,700 or so??

neat

I can run the HotCam with my 1.6 rockers and make the .525 lift the LT4 the springs were designed for. I hate the idea of leaving power on the table with the hotcam, but it's hard to justify the extra cost of another cam, plus the valve springs.

I don't want to use the stamped steel 1.5's that are on my car now, and I have the 1.6 LT4 roller's in my garage so it made sense to me to install them and the matching LT4 springs when I do the intake swap. I decided I'd do a cam at the same time too, now I just need to decide which one.

vernw

iTrader: (2)

If that LT1 was a 383, would you think the Comp 305 would be a fairly decent choice if you have to pass a sniffer?