avro206

who has done it and what can I expect? I've haven't heard much good about them but they have to reduce my et a little, right?

(don't even suggest a cam unless you'll put it in for some beer)

JokerRS

Gota help alittle. What other mods do you have?

89formula35O

i got some gm 1.6 roller rockers ill give ya for $275.


http://www.paceparts.com/product.asp?0=0&1=0&3=629

avro206

well...not much. Trans-go shift kit, Corvette servo, 4.3L V6 stall converter and open air element (no K&N at the moment)--
those mods knocked 0.3 sec and added almost 2 full mph.

I am getting a chip from TBI chips--will track test next week.

I'd really like another 0.2 from the chip and if I got 0.2 from the rockers that'd be okay. For a total of 0.7 faster then stock.

vwdave

IMO, there are alot of mods out there that would give you as good if not better results for cheaper. (The ones that cost more are worth it.)

Headers come to mind, but they are a PITA to install.
Cat-Back
Gears & Posi
K&N
Intake
Cam
Heads (Vortec) and Vortec Intake

Why dont you look into Comp Magnums? Speaking of which, I am going to do a search on those.

avro206

for about $160 CDN thats pretty cheap. Big stuff has to wait until much later, thats why I'd like some little stuff..the cumlative effect has worked okay so far.

Hasn't anyone put these on a very stock TBI and gotten any results? (ie 1/4 beofre and after)

r90camarors

I installed them on my 305 along with a new intake. Definetely made a big sotp difference, but I think the two really complement one another. If you're interested, I still have the 1.6 roller tip rockers, I'm just not using them because I needed 1.5s for the time being on the 383. If you're interested, they're all yours for $55 shipped. They have less then 2,000miles on them.

SilverSub122

i might swoop up on those 1.6 rocker tips, as long as they will work on a 305 tbi, im acquiring my parts, just havnt had time to put any on yet lol....
also, would those be smog legal? i have to pass CA emissions

Matthew91-Z28

Will 1.6 rockers install right onto stock head swith no modification?

vwdave

As long as they're made for centerbolt valve covers, I dont see a reason why they wouldn't fit.

I dont see any reason why they wouldn't be smog legal, but I personally dont have to worry about it.

matt_82transam

hey 87 iroc, what do you mean costs 160 canadian..the roller rockers?

91305z

i got the comp cams magnum roller tip and like them because they only costed me $75. Slightly noticable difference but you can't expect too much out of a 305 especially tbi. I'll look around and see if I can find the guys email I got them from.

avro206

Yes--that was for a set off ebay...some machine shop made them I think. The shipping would haev been figured in the $160 I said--might have been a bit cheaper.

Oh--I mean roller tipprd rockers....full rollers is a bit nuts for a otherwise stock LO3

camaronewbie

I made the compromise - I got 1.6 roller-tip versus full roller rockers, from Summit, $100. Can't tell ya much about them, as I did heads, intake, exhaust, LT1 cam all at same time, and I'm still trying to get her to run at all (computer freaking out over all the mods). My brother got some off-brand roller-tip and they broke, I think they were Proform or something. When the first broke, he replaced it with a Summit and that one never broke, but the others did - so don't skimp.

HaulnA$$

Quote:

Will 1.6 rockers install right onto stock head swith no modification?

They will as long as they are the "self ailgning" type. If they are not self alining you will have to have screw-in rocker studs and guide plates installed, not very difficult or expensive, but the heads will have to be removed to do it which is a PITA. All in all, 1.6 rockers are a good HP/dollar mod versus a cam as long as you match them with exhaust and intake mods.

SLOWTBI

alright, people are saying that the roller-tipped rockers are basically a complete bolt-on as long as they are self aligning...right??

what about the pushrods, will those have to be replaced???

also, anyone who has done a rocker swap before, do you think you could give a detailed description on how to install them...you guys have really peaked my interest here

camaronewbie

I used my standard length pushrods as my machinist suggested - although I'm not completely tuned and running well, I am running and all seems to be fine in there. My problem now is that I did too much, and my computer is freaking out.

25THRSS

You can reuse your stock pushrods and springs. The stock cam is so pitiful you wont even come close to maxing the stock springs out even with 1.6 rockers. BTW, has anyone had problems with the pushrods rubbing the slots in the heads?

TP355Z

Here's my 1.6 swap I just did

I had guide plates and studs in the heads, so the pushrod holes were bored out already.

The 1.6's I used were Harlan Sharps model S1002 which fit PERFECTLY under a stock valve cover. The car lost a little bit of idle steadiness, but there was a very noticeable SOTP difference. I drove around and it tugged nicer at low RPM and was a lot smoother in gaining rpm. The self-aligning ones are only necessary if you're using them to replace a stock self-aligning rocker arm - otherwise they'll cause BIG problems. The stock push-rods work too *although mine were hardened*.

Ty

92rsv8

hey i have done a few mods and i might do the 1.6's but will it work with stock valvesprings since i have an lt1 cam...

25THRSS

no

TP355Z

back from the dyno today - the 1.6 rr's got me 8 hp at the rear wheels, which is like 12hp at the fly. not bad.

Ty

Gunny Highway

iTrader: (1)

What's your setup? I hear the 1.6's are well complimented by the Edelbrock intake, or any free flowing intake for that matter. And I'm sure with a set of headers their numbers would increase even more.

No 1/4 mile times yet though? I wonder if they contribute more than a 12 rwhp increase normally would, seeing how you should go through your power curve much more smoothly.

brodyscamaro

yall guys need SA rockers and i wouldnt waste time/money on just the roller tips...

SLP_GTA

iTrader: (1)

rsscoty

With the 1.6 rr and an LT1 cam you're total lift will be over .500 range which is to much for stock springs you will also have to go to screw in studs or they will pe pulled right of the head.

TP355Z

Gunny -

Next summer I plan on getting some 1/4 mile times once I wrap up some simple stuff this winter. As far as an intake - I'm running a ported holley 2in' bore tbi unit, which I'd say is superior to the Edlebrock unit easily, and a full free-flowing exhaust. Personally, I dont think most of us would notice much bigger differences with out motors b/c you can't push a ton of hp with the TBI and the 1.6 ratio will only open up as much power as the cam allows it to change y'see where i'm going? *(on a small cam, the 1.6 makes a relatively small difference in lift, but on a big cam...)* My motor's good for about 270hp and like I said, I picked up a pretty happy gain. But I think if I had some nasty 427 small block, I would have got a bigger gain. Oh well, low compression, crumby heads, and I got what an LT1 gets. I'm happy. lol

Ty


This winter:

Cooler Firing Plugs (I was running wicked hott AC delco units...bad idea...)
New Plug Wires (Can you say header cooked?)
Aluminum 4th Gen Driveshaft
Stickier Posi

MericanMuscle

Simple question... with 1.6 rockers what would a 97 lt1 cams total lift reach, and also would a pair of the sr torquers hold up.. I ordered a set for the older style intakes will that affect anything.. also will i have to stay with the narrow body self aligning ones or can i use non self aligning too?? any help would be appreciated..

TP355Z

the SR torquers definitely should handle the lift - but to figure it out exactly, take the LT1 lift (say, .456) divide it by 1.5 and then multiply by 1.6. That's your new lift.

ty

MericanMuscle

Thanks for the info .. the lift should be around .477/.490 i believe, pretty decent for a 305.. chip tuning should be a blast with the new heads on there with a 4 barrel intake..

miacamaro305

so with a lt1 cam 1.5 roller rockers will they work or still to high of a lift with stock springs?

25THRSS

I wouldn't even dare use the stock springs on any cam swap regardless.

miacamaro305

okay so i put lt1 springs on to or i get a kit of springs

tbfirebird

i type in z28 valve on ebay and it cam up with

.490 lift up to that is that good enough for the lt1 cam in my 305 tbi?

miacamaro305

hey guys one quick question okay when u take out the stock cam and u are ready to put the lt1 cam in is there a certain way the cam has to go in due to the fact u put the motor on top dead center or u just put it in how ever?

25THRSS

You have to line the dots up.

miacamaro305

what dots?

25THRSS

The dot on the crank with the dot on the cam sproket.

miacamaro305

okay i read u have to line them both facing up at 12 o clock correct ?

25THRSS

no, the crank fot is at 12:00, the dot on the cam sproket is at 6:00.

miacamaro305

okay im confuse some off u tell me the crank at 12 and the cam at 12 is the correct way and then some tell me the correct way is the cam at 6 and crank at 12 so please tell me the right way+

vwdave

No, the way I told you is the correct way. The other guy was incorrect.

25THRSS

the crank is at 12 oclock, the cam is at 6 oclock.

RIGHT
O <--cam
.
.
O <--crank


WRONG
.
O <--cam
.
O <-- crank

DartByU

It doesn't matter what way you do it as long as the distributor is installed in the correct position. Think about it, crank turns twice every time the cam turns one time, if it's installed 6 and 12 then when the crank is turned one time it will be 12 and 12. I like to do it with the cam at 6 and crank at 12 because the dots are closer and it's eaiser to tell if it's correct. Then I degreee it.

miacamaro305

okay guys thanks alot now i know the right way ohh by the way black beast pm when u do ur tpi swap to help out and learn and u live in the keys right?

92rsv8

ALSO I HAVE been using the stock valvesprings with my lt1 cam for a few months now with no problemos!! you just can't rev it high until you get the better springs. i usually shift at about 5000 the lt1 cam is good to above 6000 i think. and from what i understand it is a pain to use stronger valve springs on the stock 305 heads

miacamaro305

how much horsepower exactly will the lt1 cam give me and torque with the mods i already have in my sig

brodyscamaro

Well, what does that "Stage 2" chip consist of? Who knows how much more power it would give you.

MericanMuscle

The stage two chip is from tbichips.com and runs "more aggressive timing than the stage one chip" and comes with a 170 stat.. i just took mine out today and put the stock one back in.. my idle was surging until i bumped the fuel press up to like 16psi also i asked about the problem and was told i was running lean.. and to change the fuel filter?? i believe what happened was the engine was knocking so the computer took out alot of timing and left me with a sluggish car.. needless to say im running the stock chip now with my timing advanced 4 degrees..

92rsv8

i am running 10 degrees advanced with the stage 1 tbi chip and having no problems. it pulls real hard!!!