87tpi

iTrader: (5)

I recently spun a bearing in my L98 so I am soing a rebuild now. I am having the shortblock bored to a 355 and uping the compression a little for the thin air up here at 5,000 - 7,800 ft. I am buying the Trickflow Kenny Duttweiler 195cc runners 64cc combustion chambers and a max lift of .600.
http://store.summitracing.com/partde...970+4294784603

I am also running an HSR and need the best cam for this combo. Which of these cams would yeild the best for a car driven on the weekends, mostly street, some track but not a lot? I would like to keep my SVO 24's but I may need to change. I will be running 1.6 rollers too. How much power can be expected with tuning?
This cam:
63-08-305-8 Comp Cams 276 Hydraulic Roller Camshaft, 220 / 230, .510 / .510 114 LSA, For factory roller cam engines with highly modified TPI and computer.

This cam"
xr276hr-12.
224/230 @ .050, lift intake 0.503 in. exhaust 0.510 in. , 112 lsa

Or this one:
63-08-306-8 Comp Cams 290 Hydraulic Roller Camshaft, 230 / 244, .510 / .540 112 LSA, For factory roller cam engines with TPI, modified computer, intake plenum, runners, and 2500 stall.

Or this one:
http://store.summitracing.com/partde...1&autoview=sku

89Nighthawk

So are you fishing for someone to do a computer model for you?

anesthes

iTrader: (12)

The 306 is the cam I run. bumpy, doesn't like closed loop, etc. The 276 is the came I used to run, on 112lsa. Ran great. The 305 on 114lsa is for a blower.

If the compression is around 10:1 the 276 cam can put out around 360-380 with a HSR, the 306 cam about 100hp more if the right things are done.

-- Joe

87tpi

iTrader: (5)

Not fishing for anything, thanks for the input

I will be tuning it with a buddy so I'm sure it'll take a bunch of trys to get it right. I actually am picking up a set of AFR 195 Eliminators today so I have some more research to do on a cam.

87tpi

iTrader: (5)

I just ordered my AFR's for 1,470 shipped and in stock. He recomended this cam, it looks a little small to me though. It's a Crower but he said they can get me Comp cams too.
Hydraulic Roller Cam, Duration @ .050 Intake 209 Exhaust 217. Lift w/1.5 rocker Intake .495 Exhaust .514 LSA 110

V8Rumble

iTrader: (2)

I'm not real sure about that 110 LSA - I'm thinking that if you kept the 112 you'd be a lot happier... (Both you & the ECM, it'd be a lot easier to tune.)

That's real close to the cam that I've just about decided on for my 383...

jjvette

What are the right things? I have the 276 hr cam in a 383 w/Duttweiller heads. The last dyno tune was 343rwhp but it was running lean so I stopped beating on it. I would love to pick up 100hp. Fill me in.

John

mike1986fyrbird

That cam isn't much bigger duration wise compared to the stock cam. You should go bigger then that with the stealth ram. 224/230, 230/236, 230/244 would all be much better choices.

87tpi

iTrader: (5)

I was thinking that it was too small too.

anesthes

iTrader: (12)

Sounds like your 276 cammed setup runs the nuts. 383? big flowing heads? step up to the 306 cam

-- Joe

jjvette

It runs good other than committing to a life time of tuning. Thats OK though. It's my hobby.
Before the dyno tune I ran 12.16 @112 with a 1.72 60'.
Two weeks later the initial dyno run said I had 317 rwhp.
Then I tuned it to 343rwhp.
I should be high 11's with that.
So How much do you think the 306 cam is worth?
I have been contemplating another cam.

John

87tpi

iTrader: (5)

Ok, I think I have it all figured out, finally.
I'm doing a 355 with stock reground crank, Eagle I beam rods, Probe forged pistons, Afr 195 eliminators, Stealthram and I have narrowed my cam choices to these 3.
XR276HR-12
268XFI-HR13.
CS276HR-14
With the rest of that setup, which of those would be best for my weekend streetmachine? I'm dropping the block off Friday at the machine shop and the heads will be here Thursday.

1989GTATransAm

iTrader: (3)

No question the 268XFI-HR13. It is the latest design cam and has the lift to take advantage of the AFR heads. A much better cam.

87tpi

iTrader: (5)

I saw the vid of your dyno pulss, really impressive. Do you have anyother videos of your car with that cam?

1989GTATransAm

iTrader: (3)

No that is the only one. Maybe when we do the dyno tune.

19doug90

curious to see how this runs on a dyno

195cc afr heads ive always thought to be way too much head for a 350, more designed for a 383, unless you planned on reving till 7000

the first cam the 276 is what i have in my motor. Running a stealth ram with 180cc iron eagle heads which is a TOTAL mismatch i know, heads are killing me. with 1.6 rockers youd be getting descent lift out of it but id think youd be looking for more rpm and more lift with those crazy heads, i peaked at 6000 with those heads i wouldnt want to be shifting anywhere before 6500

87tpi

iTrader: (5)

Engine is at the machine shop right now and my heads will be here tomorrow. I went with the combo in my sig.

19doug90

post dyno numbers, curious to see where in the powerband you make power with that setup.

I was strongly under the impression that the 195's were too big for a 355.
On that size motor those heads are going to want to make peak power at 6500 rpms and the cam is going to cut out around 6100.

I also think the butt dyno isnt going to register anything until you hit 3100rpms.

This is all just what i have come to believe tho, dont have hard numbers behind this, feel free to prove me wrong, im very curious to see how this combo comes out

87tpi

iTrader: (5)

I have had a couple of people run this combo through there desktop dyno and my machinest ran some and recommended this cam also. I don't really need really high rpms, I just want a mean street machine that'll do low
12 's/high 11's at the track.

This is what the dyno suggested.
430 hp and 455ft lbs. at 5,500 rpm. 390-400ft lbs. from idle up
I will post up #'s after the dyno tune.

89formula350b2l

iTrader: (11)

I am curious to see what power you will be making keep us posted being as we have the same heads, same intake manifold, same cam.... i am going to be running 30lbs ford injectors and 255 fuel pump however.

Chris Etemadi

maybe as use for reference I was recommended a 234/238 .578/.584 112LSA cam from Cam Motion. This is with a 355 w/ HSR and Pro 1 215's

87tpi

iTrader: (5)

I got my shortblock back Friday and am puting it together now and I plan on dropping it in, this weekend or next. I still need the rockers, pushrods, and converter before I take it to the dyno. I will post up #'s and plenty of video when it's running.

I have been looking at a different cam, which would you guys recomend between the xr276hr-12 that I said above
http://store.summitracing.com/partde...8&autoview=sku

or the 280XFI HR13
http://store.summitracing.com/partde...8&autoview=sku

89formula350b2l

iTrader: (11)

if you want low 12's with the 355 i say go with the 306....ive seen alot of guys go 12.9-13.2 range with the 276 cam with drag radials. btw will you be running radials, street tires or slicks at the track?

Camaroz29

iTrader: (3)

I think is part of the "old school" train of thought. This mostly comes from the carburated days before EFI, when 110 LSA cams were the way to go and CR was supposedly limited to 9:1 for iron heads and 10:1 for aluminum heads to run on pump gas. Since the advent of EFI and all of the things that have come along with it a lot has changed but not all of the information out there is new. Newer cam technology is out now to take advantage of EFI and the game has changed a bit. 195-205cc heads are common on 350/355s now along with much higher CRs, and predictably more hp is being made. But the power does come higher in the powerband, typically around 6,000 RPM for peak. A 355 with 10:1 CR and 180cc heads along with a middle of the pack cam will definitley be more torquey and peak around 5500 which isn't necessarily a bad thing. If lower rpm power is what you want then a build like that is great. Lately though EFI 350/355s are definitely departing from the traditional train of thought in the quest for more power.

jjvette

Nice Camaro. I watched your video. How do your neighbors feel about it? They're probably not feeling the love! huh?