gabriel_92z

first of all I am new to posting on this board but i have been following the posts on this board for quite some time and I would like to add that some of you here here have some real cool cars. well enough *** kissing and back to subject, my car is a 92 z28 5.7 tpi (purple haze original paint) gonna need a new paint job soon and minor body work to the left quarter panel) with 98,000 original miles, only current upgrades to the car are an accel base and ltr which i currently have apart to siamese the base and port match runners, an afpr, lt1 injectors, hedman LT hedders and full exhaust, trans was also rebuilt with fairbanks servo and transgo shift kit, and a 160* t-stat. My question is what would be a good cam for my car , I want a noticeable idle ( I love the sound of a lopey cam) and i want the car to be fairly streetable and run at the strip on da weekend. hopefully it will pull to around 5200-5500 rpm after the siamesing.I was thinkin about a lunati voodoo series cam but i am open to any suggestions, cam or cam an lifter kits any suggestions would be great.The car is a work in progress but little by little its gettin faster. car went 14.76 when i jus got it, and went 14.4 when the headers were added( ran open hedders). its got a sh*tload of wheelspin so im trying to fix that too

gabriel_92z

any suggestions?? And will siamese porting the base , runners side, really help out the top end....?

Shagwell

the port work will add top end. I don't think the Voodoo cams are offered in hyd roller, and since you should already have one(OE motor would be) don't give it up. - something in the area of 220 duration(@.050 duration, advertised doesn't mean much), 500 lift. Since you're there and already doing port work, pull the heads and port 'em. The difference is deffinitely worth the time/effort. With stock heads(ported or otherwise), get a "dual patern" cam. (ie, 214/220, 497/502, not 220/220, 500/500) I'm running a Doug Herbert roller. Great cams and a little less $ than most others...

gabriel_92z

thx for the reply.. yea i was told the car was a hydraulic roller but have no idea what the advertised duration on the oe cam is. Imma look into the line of cams you suggested and around how much of an increase in power would i see if i went with a dual pattern cam with the advertised duration u mentioned?And is that lift with 1.6 rockers? BTW i think that holley voodoo cams are now selling hydraulic rollers too

http://www.holley.com/types.asp?type=283

I was wonderin about these 2 cams in particular
- http://www.holley.com/54755
- http://www.holley.com/54743LUN

gabriel_92z

anybody else got any more suggestions, i think imma do the swap this weekend so any suggestions will be truly appreciated

RednGold86Z

iTrader: (1)

The second, larger one looks like what you're after (219/227; .471/.480; 112/108 lsa/icl), if you want a lopey idle (but not too lopey by any means). You MUST change to better valve springs though (with ANY cam change). Also, a new timing set is in order, and some pushrods will be in line as well. The lifters you can keep, no problems, usually.

You'll definitely want to run with a 2400-2800 RPM stall speed torque converter. Headers and exhaust are a must, too.

The smaller cam will probably keep you happy, though, maybe.

D's89IROCZ

Being a 992 setup . I think you have the SD setup . They are finicky on what cam goes in and all that . I would learn how to tune fast for any of them cams . Or you will have a nice lawn ornament


Yes the porting will help the topend out . Normally they topout in the 4600 range. I just siamesed the runners ( 4 ") on my Edlebrock units and the base radias was smoothed . With teh little ZZ4 cam I got it to run to 4900 for sure. With un ported heads. i think that would have helped alot . Check my cardomain site out to see the dyno graph if you want. also pistures of the tunners ported and plenum . You need to siamese the plenum aswell .

D's89IROCZ

Just to to ss up some prting shots of the TPI .

Shagwell

- unless not possible, stick w/ 1.5 ratio rockers -
- The first cam would be a little better suited to the stock style intake. The smaller duration/higher lift would work better with the TPI intake. A little less lopey of an idle, but deffinitely noticeable.
- That second cam sounds great, but port work+stall converter are pretty well a must. It'd be ok w/ the stock converter to get you buy, but it wouldn't like it too much. It'd be much better off with an aftermarket base, runners and ported plenum - even happier with a HSR. It'd deffinitely have a noticeable idle.
- D's89IROCZ just set an example for you on your port work. A good example.

doc

First of all, I'm not a cam expert. Secondly, I do know an ECM friendly cam has an LSA of 114*.. So, if you want a noticable lope than you probably want to go with 110* LSA. Further, if you do enough porting along with your current aftermarket parts, you might think about a 220*/224* or 224*/230* split duration cam.

bonz

I went with a XR269HR along with my listed mods. I have only backed it down the driveway from the garage to wash it so cant give a lot of feedback. It has a awsome idle nice and lopey. Like what was stated Speed Density my run into issues. I need to set the idle on mine so it doesnt stall but other than that it runs fine. Cant wait for winter to be over so I can get out and drive it.

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Mods. GMPP Vortec heads, Comp Cams XR269HR, Crane Gold Rockers, Hooker headers, SDPC intake manifold, free flow exhaust, Air Foil, TB Bypass, K&N filter. Future mods, TPIS Runners, AFPR.

Shagwell

factory ecm/tune is fine to around 112 centerline. No problems. - that 110 and 220+ duration will give you a lopey idle, but make less power on a TPI...unless severly modded...

gabriel_92z

thx for all the replies, i think i will go with the second cam i posted, imma go with 3k- 3.3k stall converter, order a burned prom : but currently the car is at the shop gettin painted.........So it would be better 2 stick with 1.5 ratio rockers other than switchin over to 1.6's??Y wat difference would it make??( like i said im not much of an expert when it comes to cam and valvetrain components) And what pushrod lenght does my car use or will require after cam swap??
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btw will soon post pics of da car, gettin painted same purple haze metallic color n got a harwood lift off cowl too. Gettin da door handles n lock shaved, rite now it will be sittin on stock wheels but goin to upgrade to 18" wheels by da end of nex month or early june.