LS1121

iTrader: (17)

Well I have to ask, I've read everything till my eyes hurt and I'm still not sure so........... I have a 98 Z28 LS1 with a ton of miles and wanted to do a valve job some freshen up work instead.....I bought a set of 799 heads and am going to have someone install them along with a LS6 intake . I'm going to replace the lifters and push rods again because many miles on the car. I want to replace the cam at the same time but unsure of what to get. I am running stock manifolds and cats from an 2000 z28 and am going to keep this package. What would be a good cam to put in? I would like a little more power maybe another 60-70 hp. What are my options. This is my daily driver and i like the gas mileage.

z99ls1

iTrader: (12)

You can't eat your cake and have it to. I would go with a low 220's cam since you have alot of miles. It won't drop your gas to much and it will still make somewhere around 40hp with just the cam.

LS1121

iTrader: (17)

But Why? I like my cake lol i was thinking 224/224 .563 112? or is this tooo much.

99Bluz28

iTrader: (35)

With stock exhaust manifolds you'll want more exhaust lobe duration.

garygnu

what tranny ,A4 or M6?a tsp cam pkg is good power increase for the price.look at a comp cam LSr cam,most have a 8* duration split .they are listed at the WS6 store.

LS1121

iTrader: (17)

It's an A4

01ssreda4

iTrader: (96)

I would look at Thunder's cam for stock manifolds.....Old Man Cam I think is the name. Would be good for what you are wanting to do.

crainholio

iTrader: (2)

I'm running a Thunder cam w/ those specs and get 27-29mpg on the highway in 6th gear, and that's with 3.73 rear gears.

LS1121

iTrader: (17)

Are you using stock heads with stock springs and rockers?

z99ls1

iTrader: (12)

How many mile do you have exactly?

LS1121

iTrader: (17)

276,000

z99ls1

iTrader: (12)

stock bottom end?

crainholio

iTrader: (2)

Stock 241 heads, rockers, and F-body exhaust manifolds.

I was running Crane dual springs and they did very well since 2004, but the engine is getting a freshening from a suspected lifter failure so I'm going w/ PAC beehives this time around.

edit to add: the TR cam has very aggressive lobe rates and there's no way I'd run any factory spring w/ it. LS1 spring is out of the question regardless, LS6 spring might have enough coil clearance but the spring's rate is not likely to be stiff enough to keep the valvetrain under control.

LS1121

iTrader: (17)

Yes stock everything

LS1121

iTrader: (17)

I was going to use those yellow springs that come with the LS2 with 243 heads

crainholio

iTrader: (2)

If they're new springs they might be OK, but no way I'd run used stockers w/ that cam.

I'd go with PAC or PSI beehives, personally.

garygnu

holy mileage batman..buy some comp 918 springs.get a new oil pump and timing set,the thunder racing cam will work great.get some newer lower miles rocker arms .or do a comp cam trunnion upgrade.do a compression check and post your results.do a valve seat leak test on the 799 before you install them.if they weep do a valve job.

LS1121

iTrader: (17)

I have the heads here they are New and i just bought a set of "New Take off" valves from Ebay they look new not a mark on them and they all drop right in I checked. Have the valve covers from a member here, a set of rockers from a member here, the rockers seem to have a little play in them is this Normal? If not i can do the Trunion upgrade myself. Oil Pump and Timing set OK that will be my next purchase.

My Main concern is that with all the mileage on the bottom end, that is used to having the old parts, I don't want to double the pressure so to speak and blow out the bushings on my Crank. All being said, this is probably the best car I've ever had.

crainholio

iTrader: (2)

Whoah there, put the tools down and do some reading before moving ahead.

As for the rockers, even brand new GM rockers I've bought had a noticeable amount of play in the trunion shaft. Seems to be designed into them.

LS1121

iTrader: (17)

Yes but do you get my point? The motor has 276,000 miles on it. I'm concerned about stressing out this old junk with new HP parts.