wht97ws6ta

Im just curious as to why its rare to see people running these grinds up here. Seems like they are capable of great torque with their aggressive lobes. The only thing i can see thats holding them back on some HP is the 113 LSA. But then you gotta ask yourself do i want great drivability, or ***** to the wall power. Seems like they would make great streetable power. Whats your opinion?

lovemyzroc

I have a 1994 Camaro with a built 383 stroker motor! I have the comp XFI grind in mine! I love it cause of the great torque and power but it KILLS all gas mileage! I am getting like 10 mpg! But other than that i love the XFI grind

StealthFormula

iTrader: (35)

Yeah doesn't seem like a whole ton of people run the XFI grinds. If I had to guess why I would say it's some combination of:

1.) The XFI cams are fairly new and not nearly as proven as some older grinds which may steer some away.
2.) XFI grinds take more of a beating on valve train components than other grinds on say Xtreme Energy or Magnum lobes which may steer some people away.
3.) The overly wide LSA's certainly don't help them in my book.

Buddy of mine has the XFI 218/224 with beehives and he's been running that setup for a couple years now and he seems to like it alot.

BALLSS

XFI grind is "newer" design over Magnum lobe profiles. XFI lobes are designed for FI applications, not Carb motors. You will need "bee hive" springs for them.

I have the 218/224 in my 383. VERY streetable and passes smog with no issue (most likely due to the 113 LSA). makes great TQ.

wht97ws6ta

Im planning to put a 355 together and havent decided to custom grind a cam or go with the 218/224 XFI piece. I like the looks of it, though it will leave some power on the table. Im looking for a good balance between good streetability and power. I can probably go with a smaller lift because i fixed my heads to flow killer at low lifts and they only go from 277 to 283CFM between .500 and .600 lift, so they are a little flat on the top from the smaller intake runner. I still think that taking the EXH lobe from the cam above and the INT lobe from its big brother, which would make 224/230 duration and .565/.576. lift on 112 LSA would make an awesome cam. Im also running 8mm stemed valves so with the lighter valves that shouldnt be to agressive of a cam.

JB_97ws6TA

iTrader: (6)

Lunati's Voodoo series also run the same type of lobes as the XFI and that is the same lobe profile that some of the reputable LT1 custom cam guys use on their grinds.

StealthFormula

iTrader: (35)

I would go custom way before I would go with that XFI 466 IMO. For example this is my custom grind...224/230 .570's on 107lsa using XFI lobes. The LSA is too wide with the off-the-shelf XFI stuff and for about the same money cannot beat a custom grind. To get a good balance of streetability and power your going to want something similar to my cam I would contact Lloyd Elliott or Ai.

BALLSS

"generally" the LSA will be wider on off the shelf cams which helps on the emissions side. A 'custom" grind will allow for more power but may not be as smog friendly with a tighter LSA.

wht97ws6ta

Yea i definitly agree with you on the tighter LSA will make more power. But i and more concerned with effieciency and drivability and a flatter torque curve than i am about making a big HP number. This isnt exactly my daily driver but still gets driven 200 miles a week or so. Im the kinda guy thats more impressed to see a smooth running well mannered motor go out there and rip the track up and take it with it when it leaves and doing so in a quite matter. I think what im going to wind up doing is build a mild motor and put a fogger system on it so it will be well mannered and lethal when i need it to be.

StealthFormula

iTrader: (35)

Believe it or not my car is a great example of that. My car actually has an extremely flat torque curve with a peak of 390rwtq at only 3600rpm. The drivability is incredible with my car but it's all in the tune really, with my mailorder it drove pretty well but when I had it dyno tuned last week we made some adjustments and it drives beautifully. A few weeks ago I drove the car an hour and a half to the track to make some passes. My parents and friends were amazed just because how smooth the car is. It's launches so hard and straight out of the hole and just flys down the track effortlessly and it's great because I just jump back in and drive it right home. The custom grind cams are really the way to go I feel. I'm actually planning on taking my car on the hot rod power tour next year, which I wouldn't do unless the car was comfortable and reliable.

Nitrous would be nice, nothing like a car that drives 100% stock and packs a punch when you want it to. That's what has me wanting to go the forced induction route with my next car.

gregrob

iTrader: (8)

I like the XFI lobe profiles a lot. I had mine custom ground.

wht97ws6ta

If you dont mind me askin what lobes did you use. I got the same exhaust and gears as you. Right now im having issues with the tranny shifting with my 4.10s. Are you running stock heads? And what kind of quarter miles does it run?

gregrob

iTrader: (8)

PM Sent.

Bersaglieri

iTrader: (13)

XFI lobes are not as bad as many try to make them out to be. When you set everything up right they work well.

-Dustin-

96capricemgr

iTrader: (1)

Which means using more spring than Comp recommends since their rpm ranges are MUCH lower than reality.

Set up an XFI cam per Comp's recommendations in a 350/355 and you WILL have valve train longevity issues. A stroker will bring the rpm range down nearer Comp's incorrect listed ranges so it wont be as pronounced there.

aboatguy

Had a 280xfi now I have custom. The xfi has wider LSA than optimal and was harder on the valvetrain than my custom cam.(trust me it was) My custom cam has aproximately the same duration, more lift and 3 or 4 degrees less LSA than the 280XFI it replaced.


My custom cam is much better to drive.


MIKE

gregrob

iTrader: (8)

You could have easily had a custom XFI grind done if the LSA wasn't what you wanted on the off-shelf 280

wht97ws6ta

Ok your saying that the xfi lobes are a very aggressive lobe and is tough on the valvetrain, but your custom cam is easier on the valvetrain because it has the same duration and more lift....????? Cant be so. If you have the same duration and more lift then you have an even more aggressive lobe. You are vaulting the valve open further in the same amount of time. The lobe itself is the only thing that will determine how much pain the valvetrain will see. Lobe seperation has nothing to do with valvetrain wear and tear. Im not trying to be a *****, just trying to set things strait.

Wicked94Z

iTrader: (26)

not necessarily, need to see the .020 and .2 durations to see the agressiveness of the lobe. lift certainly can change for a given duration on the same lobe profile.

the_merv

iTrader: (88)

I know this is LT1 stuff.. but I'm running XFI Lobes on my Cam..it has alot of power.

Here is mine..