Is there anyone making power with this cam? We need to know. 355 an or 383 engines.

FWIW, we've seen around 350whp at 5000 rpms with valve float problems from the smaller 218/224 XFI 268 cam from 1989GTAtransam.

Another LT1 on camaro z28 made near 370whp on ported stock heads that flowed near 260/180 by .600", with that smaller 268 XFI cam

I've seen near 350-360whp from stock LT1 headed motors with the XE version of the 230/236 cam and the supporting full bolt ons/tune

So its safe to say if you can control the lobes on that cam with great valve springs like beehives or springs like AFR 8019's or Patriot's Gold Extreme springs, then its gonna make good power with good flowing heads and proper intake

The overlap is somewhat mild and it should do well in all 350-383 motors. I'd actually run the XFI 292 in a 383... i've heard the XFI 292 which is 242/248 on a 355 LT1 and its about the same as the cc306, if not abit smoother and is better driveability than that cc306. It has 4.5 degrees less overlap at seat timing

You still trying to squeeze most juice out of that 355? You on a mission!

He has a lot of competition and the hand writing is on the wall. If you stand still you will get run over. So Vincent is in the process of a makeover on his combination for more horsepower so he does not get left behind.

The horsepower race is on. New combinations are comming online and I would not be surprised to see near 400rwhp with an M6, modified TPI and with 355 cubic inches.

IMHO the XFI280 cam is one which you can attain those goals.

I can assume that not to many people here is using that cam. Oh by the way, that cam passed Califorina smog in a 406 Super Ram engine.

yeah its relatively new cam grind so i wouldnt expect many ppl here running that cam just yet. i've seen one or two, but havent seen any power numbers or track times yet

The very high valve lift also will scare some ppl away. Those cams require great valvetrain components, and most heads arent capable of handling them out the box. I even upgraded my AFR's stuff for a somewhat less aggressive lobe cam that i'm gonna be running, since i wanted to turn some rpms. That XFI will support power to 6500 rpms on most 355 and some 383 motors, so you will need great springs and lifters capable of handling that load. AFR eliminator springs will be "ok" out the box but not optimal. you need their 8019 spring upgrade to really get the most out of that cam.

Looks like Adrians motor will beat yours to the dyno. It will give us a chance to see what that cam does in his motor. Should be an interesting year power wise and at the strip. I think we will give those 4th gens something to think about at the F-body invasion.

Most of the 4th gen guys run NOS or SC to make their cars run. Just in our clique we run straight motor. I ain't scared of none of them. We can make as much power as they can on the motor. We just have to figure out how to with what we have and still be smog legal.

i am going to have to disagree with you on the 4th gen guys, i am one and most of the lt1 guys are on motor over on ls1tech, hell the bolt on ls1 record is 10.8 you dont need a power adder if you have the motor touched by the hand of god.

I think what Vincent is refering to are the 4th gen cars we run across out at California Raceway in Fontana, California. I will bet over half of them are on the bottle.

ALot of guys run the bottle.... its a good power. i will have it on my car

ok i see.....btw I am running the 280xfi in my 350lt1, no times yet because of this awsome chicago weather but ill let you guys know if interested. its a sick sounding cam and feels real strong in the couple laps i took around the block. it is hard to control the lobes of the cam, and it needs alot more rpm to make power then comp suggests, just make sure your valvetrain is pretty strong and will hold up to 6500+ rpms.

Cool! Is there anyone else with this cam? Or some of you are scared to run this cam. It will pass smog. It's the best overall off the shelf cam on the market. The 268XFI is second with aftermarket heads. After that my opinion is the Comps HR276 on 112 LSA.

I am trying to choose between the 280XFI and the XE276HR-12. My engine is a 350 with SuperRam, AFF Street Eliminator 195cc(in a month), 1.6:1 Rocker arms. The short block is a balanced L98 350 with LT1 pistons and rods. I don't want to need to rev the engine higher than 6500RPM to make real power, so I guess the XE276 would be better. But perhaps some of you have some experience and can give me a better advice.

superram will peak that cam by 6000 rpms. i'd go with the XFI 280.

Just make sure you get the AFR heads with the upgraded 8019 springs. MUCH stronger springs and its only 100 bucks extra cost

280XFI, huh? Is it really that good? I guess I'll strongly consider it then. Any other options I should look for?

hey orr89roc if you dont mind what lifters u runnin with that custom cam i saw you list a while back?

LS7 lifters for my setup. we'll see how they work


the XFI280 is a nice grind. Makes great power from what i've been seeing. It makes more mid range power than old popular grinds like the CC306 and is abit better than the Xe230/236 grind. You can order the high lift version of the XE grind and should match the XFI grind's power numbers. The wider LSA of the XFI series tho makes idle very smooth and good torque curve

I'm building my new combo with it, I should be done with it in a couple of weeks. hopefully a dyno run soon after. btw im going from the xfi268 cam which was pretty damn good.

The best advantage of the XFI stuff is the ultra high lift which is GREAT for modern heads that flow peak upwards of .600" lift. Most heads do flow pretty good up to atleast .550 so alittle more lift wont hurt.

the duration will want to rev up tho, and to do that you will need good springs. I'm talking stiffer beehives with 140lb seat pressure or dual springs like AFR 8019's or Patriots extreme gold springs that have seat pressures around 155-160lbs. I'm running 166-170lbs on my cam thats not as aggressive as an XFI but its designed to rev and has high lift

Yea, I'm running the patriot freedom 190cc full CNC ported heads with the extreme gold springs

and what about xr288? :-D

I have the 280 XFI waiting on me to put my engine together. I'll be running a 383 with flat top pistons, balanced Eagle rotating assy, cast iron Sportsman heads with 64cc chambers 200cc runners and 2.08/1.6 valves. I also have a Holley Stealth Ram, 3 1/2 MAF and modified air box lid to handle the increased need for air. The engine is on the stand waiting on a few odd and end pieces. Not sure how much power it will make or how long it will take me to get it tuned but I have a feeling my T-5 is not gonna like it. My plan was to be able to kill off a few Mustangs around here, I hope I make enought power for that.

Dewayne

That's what I mean. Most people installing the 280XFI have 383s. If I get the 280XFI I would get the upgraded springs as well. The rotating assembly is balanced and I'm using a high volume/high pressure oil pump and Mobil1 so I think I have the bases covered. I don't believe everything the engine sims say but here's a simulation comparing the 2 cams. Seems kind of weird to me.

I got the cam for a 350, it lost oil pressure needed a crank(or turned) so I decided to buy new crank, rods and pistons. I wanted an Eagle rotatind assy. anyway so why not go ahead and get the stroker kit. I think the XFI 280 would be a great cam for a 350 and if it wasn't for the fact I needed a crank I would have built a 350 with that cam in it.

350 will be fine with that cam. It should match the 276 cam for the most part up untill the high rpm ranges where the 280 will take over. let me see if i can find some specs on that cam and run a simulation on my desktop dyno this afternoon.

For a pretty hot 383, i would run the xfi292. there's guys running that cam on 355 LT1's and it idles smoother than the cc306 cam does. But that cam does like to rev up. I see one guy running it on a 396 lt1 and putting down some good times.

All of you who are using the XFI280 make sure you post your results, Dyno and track. I'm using the XFI280 in a modified Superram 358cu engine.

my dyno simulation shows 10-12 lb ft lost at 2000-3000 but same peak at 4500 rpms between the 276/503 cam, and the XFI280.

The xfi makes 5-7 lb ft more torque above 4600+ rpms

hp is about the same for the two cams up until about 5500 rpms. At 6000 rpm peak hp for both cams, the XFI has 14 hp more

The engine i used is a 355, 10.5 to 1 compression, using a dual plane manifold. AFR eliminator 195 cc heads. 1.6 rockers for both cams

So for the superam it looks like the XFI is only marginally better than the 503 cam but its only computer software, so its hard to say how accurate it will be. I still like the 280 cam for its hp above 5500 but you will need a healthy ported superram to really gain advantage up there. higher flowing shorter runner intakes are showing bigger gains at 5500-6000 rpms. upwards of 20hp differences


Now on a 383 with same stuff, same compression, the gains are better with the XFI. looking more like 17hp up top end and 20lb more at 6000 rpms where you make peak hp with the xfi and dual plane, where as the 276 makes peak hp at 5600 or so

i still cant make up my mind really, i want the biggest off the shelf hyd roller comp has, it looks like the xe-294-hr10 but you also have to look at the technology of the new xfi line, i want to make 500hp of the 355, no reason a all forged 355 should have the biggest, especially when it's rpm capatable and all.... my afr 195 eliminators are on the way, so i need to make up my mind soon...

chevy high performance just done a dyno test with afr eliminator 195's and the 294hr10 cam, made like 530hp peak..... with a 4.56 gear and a t56 trans, it should be managable on the street, but tuning will be a bitch, even with a stealthram and 30lb injectors...

oh well, the dillema continues... heres a good clip of the xfi-292 http://videos.streetfire.net/video/C...ust_131247.htm

i would do the XFI292 as its a proven grind that has been abit street friendly. It will want to rev to over 6500 to make power tho.

I dont think you will need that large of a cam to make your goals with AFR heads. You need a cam with high lift and duration in the mid 230's and that should make near 500 hp on motor. Keep it 11 to 1, so get the heads with right sized chambers for the pistons you want to run. And you may want 36 lb injectors too to be safe. 30's may work tho

11:1 is wayyy too high... i am aiming for 9.5:1 or so so i can add either a procharger or a 200 shot..... the test they done was a 355 with the 195 competition port eliminators..... even the 294 cam only made 530 or so....... i think at 6400 rpm..... either cam will probably need some better springs than what the new eliminator comes with, maybe not....... i already have 30lbrs, got them and the stealthram with afpr for 400, off a member here, couldn't pass up on it.....

that 292 xfi has similar lift and duration, i wish i had cam card for both to compare....

with a shot you can get away with near 11 to 1 procharger then go 9.5 or less.

To make much more than 500-530 hp on a 355, you need a solid roller and better heads. Hydraulics only can take you so far

AFR 210's ,decent compression and solid roller peaking at 6600-6800 rpms will make near 450-500whp and run high 10's at 130+mph all day

AFR has a upgrade spring tho for hydraulic rollers, the 8019 spring. Its a very good spring for aggressive big lift hydrualic roller cams like the XFI etc.

500hp is a LOT of power tho, especially on a 355. I know LT1 guys making near 500 at the wheels with a n/a solid roller setup. Revs approach 7000-7200 rpms

Do you have any numbers? How far did you go with the porting of the SuperRam? How's low end? How high does it rev before it runs out of steam? Idle?

The project is not finish yet but the manifold currently flows 261cfm's and so does the TFS heads. A simular set up but with a welded up and reported manifold flowed 300+. The hp peak and flatlined @ 5800 before dropping off. The torque peak and dropped off @ 5200.

Now I dont know too much about cams and what not but could this cam be used for a daily driver? As in getting 20+ mpg on the highway?

it wouldnt be the best DD cam but would work. 20+mpg MAY be possible if tuned properly. Else i'd stick with the 268XFI if you want a XFI cam.

I was getting 20+ mph with my XFI268 cam and 3.70 gears.

21+ here with a fully loaded and heavier car, driving 80+. 350, XFI280, AFR190's, etc. So... getting over 20 shouldnt be an issue.

I have a flat tappet xfi280 cam.

Results in the sig.
I have 10.9-1 compression too

Maybe converting back to a roller would help pick up some power..i would think you'd be running a tad faster than that on motor

See this thread:
http://www.thirdgen.org/techboard/tp...r-flowing.html

The second dyno is my heads and intake with Vincent's SuperRam runners and plenum.

[quote][/Maybe converting back to a roller would help pick up some power..i would think you'd be running a tad faster than that on motorQUOTE]

I have a older non-roller 4 bolt main block so the cost to convert to a roller is out of my budget for a while. I gotta get a better diff first!

the 50 shot reallly opens that motor up tho. Is it really only a 50 shot?

Update: Getting 20+mpg with my new Jones 228/228 camshaft.

Yah, only a 50hp shot.
I have the stock 48mm throttle body and small headers, so I guess the "extra" air helps!

I got a 58mm TB waiting in the garage

Wait what do our cars come with stock?

'87 and up did have a roller cam.

82-84 LG4 305: 8.5:1

85-87 LG4 305: 9.3:1

83-86 L69 305: 9.3:1

88-92 TBI 305: 9.3:1

85-92 TPI 305: 9.3:1

87-89 TPI 350: 9.3:1

90-92 TPI 350: 9.75:1

I just ran a 12.8 @ 106 with a 1.99 60'; XFI280, vortec heads, HSR, @10.5c/r, with an ARAP bin. Still have some things to play with like tuning, traction and some fuel pressure issues.

-Jim