i'm thinking of replacing cam.
i really don't know that much about replaing a cam. but i have done everything on the car so far and i wanna keep it that way, so i'm doing it.
i have 89 iroc 305tpi auto

i want a cam with a little more hp, and a alot of tq.
my chioces

-Chevy LT1 cam($240)
Duration @ 0.050 (I/E): 201/208
Lift, (I/E): .447"/.459"
Lobe Separation: 114
RPM Range: Idle-4500
Type: Hydraulic Roller



-Chevy Ram Jet cam($135)
Duration @ 0.050 (I/E): 196/206
Lift, (I/E): .431"/.451"
Lobe Separation: 109
RPM Range: 800-4500
Type: Hydraulic roller

i also need to know what else i will need when i do this
new springs, timing chain and anything else, will i need new lifters and push rods
what do u guys think bout 1.6/1.5roller rockers

 

man im doin similar research now so u can look for my posts and ull find out all kinds of info...ive got a pretty much stock lb9 and im thinkin of an lt4 cam which has a little more ***** than the lt1 i guess and runs pretty cheap...look down for my posts, hopefully it helps u out

 

The right cam will dramatically change your car from interesting to outright FUN. The wrong cam will turn your car into an ongoing pain in the butt sometimes nightmare.

A cam swap can have that much effect. IMO ? Other concurrent mods aside, I see three ranges of cam upgrade for the stock 305 TPI:

Conservative: 200-209 degrees duration at .050 and under .430 lift. These numbers work well in 305s and you can keep the stock valvetrain depending on the mileage of the car.

Moderate: 210-214 degrees duration at .050 and under .480 lift. Best advice is new springs and push rods.

Aggressive: 215-219 degrees duration at .050 and under .525 lift. Will certainly need new heavy duty springs, push rods and rockers.

The LSA numbers -- typically the higher the better for the street. I think 1.6 roller rockers are a good addition to your valvetrain regardless the cam choice -- just keep in mind the increased lift may push you into new hardware including springs and pushrods.

A 305 will respond to cam upgrades in these ranges more dramatically than a 350 so be cautious when '350 guys' tell you what cam to use or what worked for them. A moderate cam upgrade in a 350 can translate to very aggressive in a 305. But keep in mind that when the 305 eventually goes south the most reasonable upgrade is to a 350. So your cam choice should be one that can satisfy your needs in the 305 yet can migrate to a 350 without penalizing performance in the 4 inch bore motor (under-camming).

hope this helps,
RP.

 

I think the LT1 cam looks great to me!
The 305 should love it.
It should also be a good cam for any future intake swap to something with shorter runners.

 

i guess i need new rods and springs... what springs do you recommend with a ZZ4 cam? i might just get new SR torquer heads... will the springs on the head be good enuff for the cam? and could i reuse my old rocker arms on the heads?

 

I simply got a sligthly used 350 TPI cam out of a friends 1989 350 IROC-Z.

Not sure on the exact specs. But it should be a nice upgrade from the peanut Cam. Since I am in the middle of building a motor, I didn't feel like spending that much on the 305.

Free is good right?

I plan on some Comp Cams Roller Tip Rockers 1.6 ratio Should make the car fun until I finish the big boy in the garage

 

i'm thinkin of the
LT1 cam
new rockers
new springs and retainers
along with new lifters.

the car has 83k miles on her now.
i lookin for a better mid -upper range power. the car has this killer top end right now with great lowend tq
i want a good cam with decent hp from 1500-5000
and decent tq from idle to 3500(for the over drive trany)
does any one have any other sugestions

 

I've never talked to anyone who has run an LT1 cam in a 305. IMO the LT1 cam is on the conservative side -- especially for a 350. But it works so well for the 350-LT1 you have to figure it will work well for the 305.

The numbers on the LT1 cam are close enough to the L98 cam I think the LT1 has about 8% more lift ? I have the L98 cam in my 305 and find it to be very driveable and makes acceptable power from 1200-5000rpms.

More lift on conservative to moderate cams improves them IMO -- so I wouldn't hesitate to install 1.6 rockers. FYI: I've tried Comp Cams roller tip and they worked really well.

good luck,
RP.

 

The 89 was a really good factory cam. It would be a very inexpensive upgrade, and would work great with the factory parts. Porting and high ratio rockers would help it even more.

 

Really, I have heard the LT1 cam works great on TBI 305 LO3 but for the TPI it isn't all that wonderful.

I think a good Comp Cams or Crane Cams camshaft would be a good idea.

With some new 1.6 ratio Rockers, like the Comp Cams Magnum roller tip.

Anyways good luck in your quest.

 

I might just take off the heads and port them, I dunno.

 

Thanks for all of the help (indirectly)! I just orderd my cam from Summit Racing for my '86.

SUM-K1104

224-224 @ .050
465-465 lift
114 degrees lobe separation

Should be a nice little upgrade from the "peanut". Only $79.95 including lifters...

 

if it is a little more a little more can't hurt, plus i want the car to be streetable in everyday conditions.
i am also looking at 1.6 rollor tipped rockers
and new pushrods along with new springs, is there any thing else that i should get??

btw palric- the LT1 cam is about 16% larger than the peanut cam,
and rememder that 16% on a 305 is just as much as about 20% jump on a 350. 305's are alot more sensative to these type of changes due to the fact of such a small bore

 

Excuse me for being ignorant but what is the point of putting "new 1.6 ratio Rockers, like the Comp Cams Magnum roller tip" on a low HP 305?

 

i am about to do a swap here in the near future as well... i am probably going to get this cam

Comp Cams 08-302-08
210/220 duration @ .500
.480 .480 w/ 1.5s... but i will probably run 1.6s to get the lift up around .510
112 LSA

it should give my car a huge kick in the rear and get it going... i have a buddy who put one in his 305 before he spun a bearing... it sounded good and was awesome from what he said...

when you do the swap you will need to put in a new timing chain if you still have the stocker, new stronger springs etc...

 

To make it not so "low" on a strict budget...

 

One good reason is the the stock rockers can vary greatly in their actual ratios from 1.46 to 1.52. 1.48 seems to be the average. After market ones tend to be under greater quality control.

 

Actually ...I am specing one out this weekend ( ZZ4) .....I need the numbers on the cam if anyone has them .....( I am haveing trouble getting dimensions )

 

Prolly cuase I'm gonna stick the ****ers on my other engine when its done.

 

Oh, BTW my low end 305 put down an 14.6 last summer without the CAM or the rockers.

Of course the car isn't all that stock, its been rebuilt, with some porting, larger gears. I dunno

But yes, my 1.6s will go on the new motor when time comes. And there is nothing wrong with that. These things last.

Been using Maganum 1.5 ratio on my 275hp Z24 for about 1 1/2 now and after pulling the motor to install a larger cam two weeks ago, those suckers still look awesome...



Look awesome don't they

 

Stupid picture didnt' show up, try again



BEAUTIFUL, Gotta love Comp Cams, they make awesome products, most of my Z24 is Comp Cams. And I love the look of people when they get their *** beat by a Cavalier.

Well now to get the IROC into the low 12s.

 

Just one more for ****s

 

I put a 93' Vette LT1 cam in my TPI 305, it was measured at .456 lift before put in, I've still got some tuning to do (gonna have to open her up again to time the cam AGAIN, having some idle problems, needs to be advanced a little) but I can definately feel it pulling MUCH better in the high RPMS, I haven't had a chance to go to the track since putting it in but I'm confident I gained a solid 20-30HP over that damn "peanut" cam that used to be in it.

 

So what you're saying is they are only of any real use IF you are running a very HIGH Cam profile?

I would have thought that 280-300hp from a 305 wouldn't require that much lift and in turn stock rocker arm would be ok?

 

the zz4 cam is


Duration @ 0.050 (I/E): 208/221
Lift, (I/E): .474"/.510"
Lobe Separation: 112
RPM Range: 1500-5500
Type: Hydraulic roller tappet

whatz the difrnce between a
Hydraulic roller tappet cam and a Hydraulic roller
or are they the same thing


be aware this cam is not for computer controlled cars
youcan chec it out farther at


http://www.sdpc2000.com/cart.asp?act...d=989&pid=1438

 

why isn't the cam for computer controlled cars??

 

yea it is... the ZZ4 cam is inthe ZZ4 motor, that many people have put ther TPI setups on... how is it not a computer cam?

 

the zz4 cam may not be optimal but I would imagine it would work pretty well with a worked tpi set up but not great with a stock set up.

 

take a look at the link in my last post..
it will give you all the specs of the cam and it also says at the bottom that it is not for use with computer controlled engines.

 

No not at all. After market rockers are a good idea if you are building a hipo engine (any size). But so is after market valves springs and push rods. The point is if you are going to be running the engine up tp 6k rpms use parts that will last. Typically factory stamped pieces are not up to the task -- they won't break but they CAN lose their profile causing loss of geometry and that can be bad.

If you are ugrading rockers then for the same $$$ get 1.6s instead of 1.5s -- just more bang for your buck.

adious,
RP.

 

mmr23 has a zz4 cam in his 350TPI
from what i've gathered, the zz4 will work with computer controlled cars, but in order to get it to run well you'd probably have to have the car dynotuned or get a custom prom

 

ok, im gunna get SR heads, do i need to enlarge the pushrod guide for 1.6 rr using the louis tool?

 

I installed the world products S/R Torquer heads, a comp nitrous hp cam #12-556-4, and 1.5 roller tip rockers.

:cam specs:
218-230@.050
.462-.480
113' lobe seperation
1600-5900 RPM's

I did this install about two years ago and noticed a considerable amount of power increase. I'm not saying it was a complete animal, but this setup would pull very hard from around 3000 rpm to about 6200 rpm with a solid steady pull through the whole range. Altough I did seem to lose some low end, I think it is a good setup. I never did install the nitrous to see how it would interact with this cam, but hopefully this year I'll be able to tell more.

To give you an idea of the power i got I can tell you about some times I ran. They might not be exact but youll get the idea. I run in the 1/8th mile so 1/4 mile times might be alot better cause this seemed to be just starting to go good at the end of my track. I went from a best 2.0 60' to like a 2.3 I think. my times were pretty close from a best 9.4 stock to a 9.4 modded.
the real difference was in my speed. I ran stock at about 66-68 mph, modded I was running at 73-74 mph.

Keep in mind I have the stock 3.23 limited slip and believe if I had more gear or more track it would have been a good combo. I say would cause last fall I spun 2 rod bearings. So hopefully this spring I'll throw the nitrous and gears at it and see what it can do.

Just a longer version of my .02

 

sounds good... do u think i can swap in the cam while the engine is in the car? ive heard people do it, and its not that hard... i know im not gunna be takin down SS's, but i would like to have a nice 14.3 run... shave a second off my time.. that would be good

 

well to swap it in the car could be tricky but I guess it can be done if you have the patience.

I am happy with my setup but that is me. So if all your looking for is a little more power at higher rpms try it. not to expensive if you dont like it. All I'm doing is using it while I build a nice 350 motor.

I think the heads are an easy bolt on and better than bone stock I like my cam but like I said I bought it cause I want to run nitrous and wanted to try it to see how they worked together.

Just be carefull not to go to big on the cam cause I think those springs on the heads are only rated for like a max of 480 lift ..... I think

I know you will gain something I did....just remember I did lose some torque , nedd bigger gears like 3.73s

 

OH.. dont tell me thoes spings are only good for .480lift.. the zz4 has lift of .510

 

I was told to get the LT4 springs for my zz4 cam in the 305

 

the LT4 springs are good for lifts of up to .525"

 

Looks like I was wrong the max lift is .560


This is a link to the information on the S/R Torquers
Hope it helps

You must have Acrobat reader. Hope it works.

http://www.fbody.com/members/coptzer...uer305tech.pdf

 

Thats correct .560 for pre 87 flat tappet and .600 for double spring roller version which is 87 and later.