I have my eye on a few cams. Looking for feed back?

GM PN# 12370847
234/242 539/558 w/1:5 rockers


Comp Cam XE274H
230/236 .510/.520 w/1:5 rockers - .544/.555 w/ 1:6 Rockers
not sure of the exact part # for this cam.... 280XFI HR13??? XR282HR-10??? XE274??? please help me figure out the correct pn#

Comp Cam XR288HR
236/242 .520/.540 w/1:5 rockers - .555/.576 w/1:6 rockers


Looking for the a good street/strip cam for this combo----

-SuperRam
-406
-Brodix IK 200cc heads
-Cam?????
-700R4 w/ 2400 stall
-3:73 gears
-SLP 1 3/4" Headers w/ 3" Banks Cat back
- checkout sig for more info..

 

This Q has been asked several times it seems, even for a 406.

I do not consider myself a cam expert (far from it), but it occurs to me that first you should determine at what RPM the SR (or HSR) peaks for air flow for that displacement and let that be the deciding factor in choosing a cam. In other words, if the stock TPI runs out of flowing air at 5,000 RPM, then the cam should be selected that peaks Hp at that same RPM.

What do others think of that approach?

For the SR, when does it peak out for airflow, 6,000 RPM, 6500 RPM ?
Comp Cams web site shows the RPM of peak Hp.

I would go with the max lift that can be acheived with your parts with the safety clearance distance factored in. And, of course, you have to install valve springs that are good for lift a bit more than that.

 

The IK200s are good to ~.565 lift out of the box, so you should be fine (depending on the ratio of your rockers of course), so keep that in mind while looking for a cam. If you need to go dramatically higher than that I would recommend the RR200s. They are practically the same as the IK200s, except they are good to .700 lift and include a few other improvements.

 

Well any of those cams would probly want more than a 2400stall, i'd like a 3000stall with that combo

but like i've suggested before, i'd go GM847 or Comps 288HR. good cams for a 406.

More street friendly? i'd go the 230/236 comp cam, the XFI is the 280XFI HR113 and the regular xtreme energy grind is the XE282HR.

1.5 rockers on those cams if indeed your heads stock springs are good for .565

 

ok, looks like it will be the Comp Cam CS XR282HR-10 230/236 .510/.520 110 lobe sep. Hydralic roller - $256 from Summit
I'm hoping with the Brodix IK 200cc heads it will get me into the mid/high 11's and keep the car streetable......

 

with good suspension and launch, you should be in the mid/high 11's. for alittle more insurance step up to the 288 roller.

 

I have listed my 406 combination and the cam I am using in my vette. The ZZ-X has these figures, 240/240 at .050 lift, on a 112 lobe seperation and the lift is .560 with 1.5 rockers. I run 1.6 rockers so my lift is .595. The cam is aggressive but streetable and the car runs low 11's so it does what I want.

1986 Coupe, auto, 3.45 gears, 1973 406, 11.5 to 1 compression, SLP cold air, gutted MAS, 58 MM throttle body, ported plenium, Superram intake, TPIS BASE, 23 degree Trick Flow Heads, ZZX cam, TPIS headers, TCI 3000 stall, 3" duel exhaust, Cheap and easy free mods, custom chip, daily driver
RWHP 405 @ 5400 RWTQ 436 FTLBS @ 4000

Best run
60 ft = 1.536
1/8 = 7.116 @ 95.874
1/4 = 11.185 @ 121.04

 

I would say the Comp Cam XR288HR

 

Do you know what your compression ratio is? For me it's hard to pick a cam without knowing compression and cylinder head flow numbers. For the IK200 heads I know what they flow. If your motor does not have above 10-1, stay more conservative on the cam. That means the 230/236. If your closer to 11-1, go with the 236/242 but get it ground on a 112 lsa. Installing a 110 lsa cam will cause some low vacuum and idle issues.

I used a 230/236 112 lsa cam in my 383 and went 11.8's. This was with a MiniRam though.

www.geocities/dzperf.com

 

I'll be looking to run around 10-1 to 10.5-1 Compression

 

Sorry I have been away.....
I just put a Comp Cams 280XFI HR-13 in a new 383. Finally I have got it running. Next week i should have some idea of what's up.
230/236
.576/.571 (w/1.6)
113 lobe centers

This cam is made for TPI and 1.6 rockers. You use beehive springs.
Accel/DFI always told me the Super Ram wants at least 112 lobe centers (back when these systems were newer).

 

A sound clip of that cam would be nice as well with some vacuum readings. I have been thinking about this cam.

 

Hey Yenko-
You are way more tech than me. Note the lack of pictures or other frills on my posts.
You may want to go one below (224/230) if vacuum is a concern. My IAC valve is non functional, at the moment. Idling is challenged. With no IAC it is catch as catch can. Sometimes 1000 or less, sometimes 1400. You definitely will hear the cam, IAC or no.
I'm in the EARLY stages of tune, it runs ok and shows promise. I've got quite a ways to go, inc.getting the IAC working.
With everything working, it should be a managible hot rod.

 

As long as it can hold a steady 13 in. of vacuum at 750 rpms, I am fine with it b/c 13 in of vacuum should be plenty for the brakes. Been thinking about it for my 383 HSR with AFR heads a lot and as soon as it goes him, it will be tuned. My current 218/224 on a 112 lsa holds steady at 600 rpms. Sorry for the thread hijack.

 

i am running the comp XE282HR right now and i am running it in a smaller motor (ie 350) but it idles fine and drives great but the vaccum is a little problem as sometimes when it is cold the brakes are quite scary so i let it warm up now and i seems to go away. but just for insurance i just picked up a vaccum resevior hopefully that helps. but all in all i like that cam. sounds good, pulls up high. good luck

 

My brakes have been fine with the 280XFI in my 383.
I'll be happy with 900 rpm, when things get worked out. I have a 6 speed.

 

Awesome....thanks. Can you post of the ATDC, BTDC, etc values?

 

The IAC valve got back from it's trip to Mexico today. 1000 idle best so far. More work will probably improve quality.
This cam seems a good play car cam. i would do the 224/230 for something that's a serious driver.