scribbles

Trying to put together the info I need to get help selecting my cam, I think I know most of the info but am missing some things… Please read over the list and help me out and make sure I am not making any mistakes. Here are the questions that comp cams needs to select a cam. Thanks for the help.

Vehicle Information
Vehicle make ------------------- Pontiac
Model ---------------------------- TransAm, GTA
Emissions ----------------------- Yes, CA
Weight I think ------------------ 3600
Axel ratio ------------------------ 3.27
Transmission -------------------- Auto 4 spd, THM 700 R4
Tire height ----------------------- P245/50 VR16/N
Torque Converter Stall speed --1500 (stock not sure)

Computer Controlled Vehicles
Speed density ------------- No
Mass Air Sensor ----------- Yes
Vehicle computer type ------ stock

Engine Information
Engine size ------------------- 350
Cylinders --------------------- 8
Bore --------------------------- 4.0in
Stroke ------------------------ 3.480in
Piston type ------------------- (stock don’t know cast?)
Connecting rod type -------- (stock don’t know cast?)
Compression Ratio --------- 9.3:1
Intake manifold type ------- TPI
Cylinder Head year --------- 88
Head Part # ------------------ (I don’t know l98 heads)
Head Runner Volume ------ (don’t know)
Ported Heads ----------------- Yes (going to port when I put in cam)
Intake Valve Size ----------- (stock don’t know)
Exhaust Valve Size --------- (stock don’t know)
Rocker Arm Type ----------- Roller tip
Rocker Arm Ratio ---------- 1.5
Exhaust Headers ------------ Yes
Exhaust type ----------------- Single? Or tuned single? (putting on cat back)
Exhaust pipe size ----------- 3”
Rpm Range --------------- 1500low 5000 high (new runners + base, sound right?)
Nitrous ----------------------- No

Fuel Delivery
Fuel type -------------- Gasoline
Fuel octane rating ---- 92 (Best I can get)
Carburetor---------- no
Carburetor size -------- NA
Port Injection---------- yes
Electronic Fuel Inj ---- yes
Oversize Injectors ---- no

Air Delivery
Air Filter ------- High performance
Ram Air ------ no
Turbo ----------- no
Super Charger -- no

How will this engine be used?
Street Strip

What Type of cam do you want?
Hydraulic Roller

What type of cam are you currently using?
Stock

Considering the current performance of your vehicle, do you need?
More torque ---- Yes
More rpm ------- Yes
Is idle speed imp? --Yes

Mark 89Formula

Looks pretty good. Just say you're running the stock torque converter, shortblock, and heads. They know the specs. They'll probably recommend one of the following cams by part #; 08-302-8, 08-304-8, or 08-501-8.

FYI, the stock intake port volume is around 160cc, intake valve dia is 1.94", exhaust valve dia is 1.50"

scribbles

sweet thanks bro.. i searched for most of the info.. but had a hard time finding some of the stock info on just a fiew things..... thanks agian...

Shagwell

casting number on the heads(the digits that count anyway) is 083 for L98 center-bolt heads. - the rpm range they will be looking for is your cruising rpm, and your max rpm. - tire height should be inches, 245/50's are all right around 26. - stock rods are steel and pistons are cast(this info shouldn't matter for cam choice) just tell them stock on the converter - I'm assuming you've put the roller tip rockers on, otherwise, stock 1.5 as for idle quality, not going to be a problem w/ an emissions cam.

scribbles

sweet thanks for the help... I submitted the app yesterday with the info I had. if I don’t get a response by the weekend I will try resubmitting it, with the additional info .. I will post that they recommend when I get their response incase anyone is interested. Also is camp cams a good company? I have read about a few of their lobes going flat during startup. But I am sure all companies have a few problems. Or is their another company with much better parts. I will not be racing this motor so I expect it will never go much over 5K so I not need the best parts, but I don’t want to spend $250 on c**p. thanks for the help.

ZEEYAA

COMP is a great company, I have been running there stuff for decades and have never had a problem, you also want to check and make sure you get the correct spring rate to go with the cam. Also most of the time someone wipes a lobe off is because of error like not putting lube on that lobe just thinking they have, or running to high of a spring pressure for break in if they are running a large lift/duration cam, you will not have that problem with a roller. That was very smart of you to check with them instead of just going to the bottom of the cam page and getting the biggest one they make.....LOL.

scribbles

sweet thanks for the reply... and the info bout comp.. I will email them with thier recomendation for lifters, as well as springs ifthey dont recomend some when they recomend a cam. Thanks agian.

scribbles

I just got a responce from comp.. Is is a little mlder that what i was looking at..But they know a lot more than i.. How does this look to ya all? Here is the email...



I have listed a spec card below. If you have anymore questions just let me know.

Thanks, Hadley @ Comp Cams

Cam Spec Card Inquiry
PART NO. 08-501-8
01 INTAKE MASTER 3312S
02 EXHAUST MASTER 3313S
03 ENGINE CS XR264HR-12
04 GRIND NUMBER CS XR264HR-12
INT EXH
05 HYDRAULIC Y/N YES 14 DUR @.050 212 218
INTAKE EXHAUST 15 LOBE LIFT .3250 .3300
06 VALVE ADJUSTMENT HYD HYD 16 ROCKER RATIO .00 .00
07 MAX GROSS VALVE LIFT .488 .495
08 DUR @ .006 TAPPET LIFT 264 269 17 LOBE SEPARATI 112.0
18 ADVANCE 4
09 VALVE TIMING OPEN CLOSE 19 VALVE SPRINGS 986-16
@ .006 10 INT 24 60
11 EXH 70 18 DATE SETUP / /
12 THESE SPECS ARE FOR CAM(S) INSTALLED
@ 108.0 INTAKE CENTERLINE

13 REMARKS



Hadley Owens

Comp Cams Inc.
Tech/Sales Support
howens@compcams.com
901-795-2400 ext. 724




And the specs of summit;

Cost $245.88


Brand: Competition Cams
Product Line: Competition Cams Xtreme Energy Camshafts
Cam Style: Hydraulic roller tappet
Basic Operating RPM Range: 1,200-5,200 RPM
Intake Duration 050 inch Lift: 212
Exhaust Duration 050 inch Lift: 218
Duration at 050 inch Lift: 212 int./218 exh.
Advertised Intake Duration: 264
Advertised Exhaust Duration: 269
Advertised Duration: 264 int./269 exh.
Intake Valve Lift with Factory Rocker Arm Ratio: 0.488
Exhaust Valve Lift with Factory Rocker Arm Ratio: 0.495
Valve Lift with Factory Rocker Arm Ratio: 0.488 int./0.495 exh. lift
Lobe Separation (degrees): 112
Intake Valve Lash (in): 0.000
Exhaust Valve Lash (in): 0.000
Computer Controlled: No
Grind Number: CS XR264HR-12
Quantity: Sold individually.

Camshaft, Hydraulic Roller Tappet, Advertised Duration 264/269, Lift .488/.495, Chevy, Small Block, Each

305sbc

iTrader: (3)

IMO it looks like a good choice to me.

ZEEYAA

That actually looks like a real good selection, It will put a good concentration of power where you need it, even if you do a mild gear change later, wich would help the seat of the pants feel. Remember its a ROLLER it opens and closes and holds the valves open at peak lift at a lot quicker rate, so even though it may not look as big on paper as some of the other cams it will out perform larger flat tappet cams hands down. You might also want to look at a set of there steel roller tip rockers, they are very cost effective for what you get, and will free up some extra HP, not by just them being roller tips but they are also dead on 1.5s. I can almost assure you the factory ones are not, due to mfg tolerances. Without having an intake upgrade and headers/ more compression, a larger cam would out flow your heads/ induction system. I would feel very comfortable with that cam selection, especially if it was going to do alot of street duty, it should have a long torque curve with that LSA and thats what you need for an everyday driver on the street. You should not have any vaccume problems and you still have room to upgrade later with a converter and such. I think if you were to go any bigger you would need to burn you some chips, not that that would not hurt anyway when you make the upgrade. That cam would really wake that engine up if you were to do some exaust upgrades later on, so good luck and let us know how it works out...

spkx714

What a bunch of cool information you gave. IMHO picking a cam is the hardest thing I have ever done. Of course, that's why they have cam guys. I always think that bigger should be better, but, like I tell my wife, "it ain't the size".

scribbles

thanks for the replys. I emailed them asking what springs, lifters, and rockers they would sugest i will post what they sugest as well as its cost. I plan on just biting the bullet and changing it all when i pull the top of the motor apart. I really hope i can get it all done for 1k that is my budget, and i have not priced the cost of head work yet. I am doing it a bit backwards sence this is my first major upgrade normally i would do the externals first. But at least i will not half to do it agian. I should have it all changed in febuary. So i will give some dino # when i am done with the upgrade, and all other stock equipment.

spkx714

Hold on a minute. Before you get too far into it you should plan EXACTLY your goal. I am prolly the best at flip-floping so I do know about no plans. Do it 100% one time and one time only, you might end up with a garage full of parts before you begin, but it's better than tearing and installing twice or MORE. (Think crate engine with a warrantee.)
Good luck.

scribbles

I know exactly what I want to do.. The problem is cash.

Fist I did a complete tune up, on my car, all sensors, all fluids, and miss parts that need to be checked. plugs, wires, rotor, brake lines, pads. yada yada.

I have the oil leak on my manifold, so I decided to pull the tpi manifold, and port it, I am going to pull the heads, and port them myself, then going to have them decked, and new valves installed, with a 3 angle valve job. I am planning on keeping stock valve sizes, (It doesn’t seem to make much of a difference to put in bigger valves. Pull the timing cover, replace cam, new double roller timing chain + gears, new roller lifters, new springs, pushrods, and roller tip rockers. Re install heads, with shim gaskets, to up compression a little. Have injectors professionally cleaned, and matched. And new fuel pressure regulator and adjust accordingly. I want to do all this for around 1k, I know it will go over this but I hope by not much.

Later I will be upgrading to a complete exhaust, and MSD ignition, custom cold air intake, airfoil (made my own for like 5 bucks out of a hunk of aluminum) and a custom tune. Then I will start on the other components (suspension, shift kit, STB, SFC, exe), I want close to 300rwhp, and as close to 400flb torque as possible. With the above listed mod’s, (Yes I know I am dreaming, but oh well)

Eventually I also want to upgrade to a first intake, and a 383, with a 9 psi procharger, but that will be many years away.

I want 400hp, and 500flb of torque, eventually, but everything else needs to be done before I go that far. I just am doing the internals before I do the externals because it will already be half apart. And I am curious how the stock motor will respond to the above mods. And I wonder just how bad the stock exhaust really is. All of this is something I think, the factory should have done on these cars. Just trying to get the most out of the factory components.

ZEEYAA

HI SCRIBBLES, Just a quick note , when they do your valve job have them do a 30 deg back cut on the valves, it a simple free HP mod that works well, they will know what you want when you tell them. Looks like you do have a plan, and hope the best for your set up. Please post some numbers when you finish. GOOD LUCK.

Shagwell

that cam looks good...real good. - your list of mods looks good also. - You'll deffintely see a BIG difference w/ the cam and port work. - Then everything past that is gravy...

3.8TransAM

That cam with a little bit of tuning of the prom to keep everything happy is a nice setup.

Friend had it in ihs 355 and it worked great with TPI.

I would rate that cam as torque-ity torque-ity :-)

Worked real nice

later
Jeremy

scribbles

good to hear some more positive feedback bout the cam... thanks for the suport. I and i will be getting dino numbers before and after so i can see how much differance there is.

iroc2121

howdy guys, i know this is an old thread but i found a lot of the info very helpful! I was wondering if "scribbles" or any of yall ended up going with the Comp XE XR264HR part #08-501-8? I am hoping to put this cam into my rebuilt engine that is basically stock other than vortec pistons, 3 1/2in exhaust to flowmaster super 40, and built tranny. Were you able to run the car with the old ecm setup and let it adjust for the changes, or did you have to get a chip burnt?