00Wildcat

Swapping a stock '04 5.3 into a '79 Malibu as a daily driver w/ intentions of budget TT after I get a rearend in the car and fresh paint. I want to change the cam and already have a new set of yellow z06 springs and moly stock lenth pushrods. Will the springs be strong enough to keep the intake valve seated with boost?

JAX04

iTrader: (17)

i floated mine sometime after 8lbs, not sure when, as it went straight to 14

XtremeDime

iTrader: (16)

I ran yellows on 8psi no problem. Im still running the stock cam though.

00Wildcat

no max effort deal just want the engine to hold up to daily driving + enough power to spank most real modern street cars 450-500 RWHP sort of thing. I don't want to spin it 6000+ anything over 5500 all the time is border line abusive. 8-10 psi on small twins is max. twins on g-body with a/c probably easier to plumb than single 70mm t04

buick_lsx

im on 9lbs with no float so far

00Wildcat

"Buick" .550 lift Z06 cam and springs?

buick_lsx

ls6 cam and the ls1/6 yellows

HydroStream6

iTrader: (16)

If they are already installed leave them. If they're not installed I'd invest in something a little beefier.

98Z28CobraKiller

iTrader: (17)

I hit mine with 15 psi without any float. I was only spinning to 6100-6200 but it never floated.

00Wildcat

cobrakiller: are you running z06 cam/springs w/pt88 on 6.0L?

NicD

iTrader: (7)

It all depends on the turbo selection and how much hot side back pressure you are going to have. The last LS6 cammed 5.7L I saw had an MPT-70 and it started floating them around 7 psi.

Zombie

iTrader: (2)

I wouldn't do it personally, risk / reward isn't in a ratio I like. Much better to do it once if you know what will work.

BTW, we all start out saying I'll only go to XX PSI. When I got my car I said no more than 8psi..... You will end up feeding the addiction, you are not special.

98Z28CobraKiller

iTrader: (17)

Not anymore. When I first built the turbo kit, I used a bone stock longblock with the yellow springs on the 317 heads and the stock LQ9 cam.

Now I have a forged bottom with AFR225's with the upgraded springs and a 232/232 cam.

00Wildcat

least expensive springs that will do the job w/.550" z06 cam and boost? The new yellow springs that I have came on LS9 prototype heads, if they will work with sightly more aggressive ZR1/LS9 cam and blower why not z06/turbo combo? Of course truck heads have steel valves and LS9 heads are ti intake/sodium filled exhuast (lighter).