cutnsick

How would i go sliding a zz4 cam into my std 88 GTA?

Will the springs handle the extra lift?

What will the computer think?

How much power with the tpi?

Does anyone have one with a HSR, how much power does that make?

I can get one cheap is why im asking
Thanks for your help.

Roostmeyer

iTrader: (3)

stock spring won't handle any non-stock cam. You'd probably be pushing it with an lt1 cam and 1.6 rockers. I can't seem to find my SDPC catalog around here, but I seem to remember the zz4 having .525 lift on the exhuastk... I got away with just over .500 lift on stock heads (its was .503 lift) but the retainers were very close to the valve guides. There's only one way to find out (the hard way), but I'm guessing its too much lift for your stock heads.

anondude13

....10185071 Hydraulic roller Lift .474" I, .510" E. Duration @ .050: .208 o I, .221 o E. With TPI and a ZZ4 cam it will be a very torque heavy motor. If you go with HSR you will want a bigger cam than ZZ4.

Dr.NickRiviera

So are you saying the Stock L98 heads/springs can handle a ZZ4 as long as you don't go to 1.6rr?

anondude13

No, I'm not making any statements about stock springs. I'm just giving the ZZ4 cam specs and my .02 on the power curve he should expect.

Abubaca

iTrader: (3)

I have the ZZ4 cam in my L98.

Although some people have gotten away with stock springs, you should NOT try it. I have the LT4 springs in mine. People have been shot in the head and lived too, but ya wouldn't try to do it yourself!

The ZZ4 cam is great for a TPI motor. Too much more cam is too much for the TPI, and an aftermarket intake will require more cam. I'm planning on installing an aftermarket long tube set-up, so we'll see how that goes.

I'm currently running the ZZ4 cam, stock TPI, stock rebuilt heads with only a valve job and the LT4's. I also have SLP 1.75" headers and a hooker exhaust flowin' through a high flow cat. At the moment I have no dyno numbers, but its no comparison. Gobs more power. It moved the powerband up a tad too, but that could be in part to the headers and exhaust.

My computer loves it. NO codes whatsoever. I had to run about 12 degrees of timing as there was a little choppyness around 6 or 8. Nothing major, but there was no real power difference, and 12 idles just as good as stock. A professional hands on tune is sure to find a little more power, but don't waste your time with an off the shelf chip. Do it right or don't bother.

mcwille

i was planning on getting a zz4 cam as well so that means i need to get new springs as well?? what else new will i need?

tomclf

Great answers here by the way for those who took the time to give them. I am thinking about doing a cam upgrade to my stock L98 also - this very helpful. What about the TPIS zz-9 cam?

D's89IROCZ

I am running that set up too ...I got a bit bigger intake though . Mine idles at 900 with the stock 305 bin LOL . I too got the Lt4 springs SD1007 . With the gear swap 3.08-3.73 ...it reallly is a strong runner now! I plan on tuneing it though .....

ZZ4 is a nice cam

cutnsick

Thanks for the replys guys, most helpfull
So i might get my stock heads ported a bit, new Springs etc. then wack in a zz4. as the cheaper option before i go crazy.
I just got new headers and a 3" ss exhaust too so it should boogy. Do you think it would run low 13's?

89 Iroc Z

I am running LT4 springs on my ZZ4 cam. That is what comes stock on the ZZ4 create engine. Here are the part numbers you need:

LT4 valve spring kit (16 springs): 12495494
LT4 Valve Spring Shim (10 shims, so order two): 10212809
LT4 retainer kit (16 retainers): 12495492
LT4 lock kit: 12495503

Abubaca

iTrader: (3)

I'm currently reworking a 3.27 9 bolt to replace my 2.77!

I think a lot depends on how well your engine ran to begin with. L98's REALLY vary in output from the factory. People run stock L98's anywhere from low 14's to low 15's. I think you "might" shave almost a second off with those mods. There's lots of variable too. Can you drive well? What rear do you have.

...and with any porting, PLUS a cam, you'll really need a tune to take advantage of the work.

Abubaca

iTrader: (3)

...and one more thing. For the love of F-bodies, since our cars are so old, take off the heads and have'm cleaned too. I didn't rebuild the heads myself, so my machine shop guy took care of it all, but you can technically do the springs in the driveway. I figure since the intake and the valve covers are off, what's a set of headbolts. Might as well take'em off and have'm cleaned up real nice.

I painted mine while I was at it too!

cutnsick

yeh good point. ive got a 3.27 rear and great air and traction at our local strip.... as for driving ????
Also just got a new kn airfilter so a cold air intake will be on the adjenda. I think im running about 102 mph on a local back road 1/4 but it could be a bit rough. no idea what time.

formula_novice

iTrader: (1)

Is the zz4 cam only available thru GM? What is the cost?

Just wondering.

Thanks.

89 Iroc Z

I picked up a brand new pullout cam on Ebay for $100. Many people pull the cam out of the create engine's so you can picked up a new cam for relatively cheap.

bluegrassz

iTrader: (3)

I wonder what the zz4 cam in a L98 with a singleplane intake and a holley 750 carb would do?

red87iroc

Salee Chevrolet has new take-out ZZ4 cams for under $100 plus shipping.

D's89IROCZ

I expect to get high 13's with mine ....after tuneing it . With the stock 305 bin ...I ran a 14.4@95 but that was with a 225 lb buddy in the car , 235 /60/15 bald tires .....and I didnt launch it good at all


so high 13's seem realistic.

mcwille

WHO??? i really want to get a zz4 cam