292 xfi cam with what top end?
#1
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292 xfi cam with what top end?
I know this has been discussed but many people are scared of this cam or just think its too much. I have a forged 355 lt1 ported stock heads 1.65 roller rockers...bringing my cam to .604 and .599 lift and intake duration @ 242 exhaust .248 and 1 3/4 dougs long tube headers
Now heard this cam can peak after 7000 rpms which for the optispark would be a problem..I need real world figures here from people who have ran or seen this cam ran. What top end set up would make awsome figures, I know that my heads are definetly holding me back but i have to say that this car has ***** with the set up it is now. please post your .02
Now heard this cam can peak after 7000 rpms which for the optispark would be a problem..I need real world figures here from people who have ran or seen this cam ran. What top end set up would make awsome figures, I know that my heads are definetly holding me back but i have to say that this car has ***** with the set up it is now. please post your .02
Last edited by blk3rdgen91; 02-16-2012 at 12:29 PM.
#2
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I've never ran the XFI 292 but I have used the XFI 280 a whole bunch on 383's. The lobes are a bit of a PITA to control and it makes a little noise but it screams on the big end and makes real good power down low. Works great with a 3000 stall converter.
You're going to want a great flowing set of heads to use that cam on a 355. Why do you want to go so big? The number one mistake that many people make is to over cam an engine and driveability suffers. You can make just as much power with a lesser cam and have better manners. A milder cam designed for your engine would be faster too. IMHO.
You're going to want a great flowing set of heads to use that cam on a 355. Why do you want to go so big? The number one mistake that many people make is to over cam an engine and driveability suffers. You can make just as much power with a lesser cam and have better manners. A milder cam designed for your engine would be faster too. IMHO.
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semper fi gunny...yea i understand that the smaller caml could produce more power with the top end i have now , but who has ran this with its full potential no one that i have seen so far...Have the cam in there already and was running into this dilema of bigger cam vs smaller cam what are my potentials with this monstrocity of a cam?
#4
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The peak power rpm depends in part on supporting parts like headers, heads, and intake, valvetrain. Those 1.65s might make it a little difficult to control and have you peak low because of it. Some guys have it peak down around 6500, if you dig through old posts by fergymoto you will find he had it on a stock shortblock with Lingenfelter heads and the pcm ran out of rpm at 7000 and it had not peaked. The Lingenfelter heads worked great and let the cam keep pulling and making more power.
#5
Peaking lower wouldnt be such a bad thing in this case.
Anyone have some power figures tho. It is a monster. But so should output be in the right combo...even in a 355.
Anyone have some power figures tho. It is a monster. But so should output be in the right combo...even in a 355.
#6
It seems like i've typed this out 100 times in the past month. I have that cam in my stock shortblock 350 with mildly worked TFS195 heads. The heads flow around 255-260cfm, nothing special. I also ran a single plane intake which helps up top. The car pulled real strong from 5000-6500, then fell off a tiny bit. I shifted all day long at 68-6900. With some better heads i'm sure I would have needed to go over 7k. I ran an 11.11 at 121.65 at 3100lbs in 1250ft da.
#7
It seems like i've typed this out 100 times in the past month. I have that cam in my stock shortblock 350 with mildly worked TFS195 heads. The heads flow around 255-260cfm, nothing special. I also ran a single plane intake which helps up top. The car pulled real strong from 5000-6500, then fell off a tiny bit. I shifted all day long at 68-6900. With some better heads i'm sure I would have needed to go over 7k. I ran an 11.11 at 121.65 at 3100lbs in 1250ft da.
U think those AFR 227's could do better?
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#8
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For comparison here you have another car with ported gm heads and intake with a 228 intake cam actually going 10s at 3800lbs.
https://ls1tech.com/forums/lt1-lt4-m...1-119-7-a.html
Yes Cecil in december is awesome weather BUT there is also a 700lbs weight difference which IMO is a bigger deal.
https://ls1tech.com/forums/lt1-lt4-m...1-119-7-a.html
Yes Cecil in december is awesome weather BUT there is also a 700lbs weight difference which IMO is a bigger deal.
#9
For comparison here you have another car with ported gm heads and intake with a 228 intake cam actually going 10s at 3800lbs.
https://ls1tech.com/forums/lt1-lt4-m...1-119-7-a.html
Yes Cecil in december is awesome weather BUT there is also a 700lbs weight difference which IMO is a bigger deal.
https://ls1tech.com/forums/lt1-lt4-m...1-119-7-a.html
Yes Cecil in december is awesome weather BUT there is also a 700lbs weight difference which IMO is a bigger deal.
Want me to pick on your car now? LMAO, I could be here all day. You should bring your tri-colored taxi down to the shootout and show me up.
Not sure what your comparison has to do with the OP's thread and the questions he asked. What is the thread title again? Oh yeah, what heads to go with an XFI292 cam. He wanted real world results from someone who runs this cam. That's exactly what I posted.
#10
For comparison here you have another car with ported gm heads and intake with a 228 intake cam actually going 10s at 3800lbs.
https://ls1tech.com/forums/lt1-lt4-m...1-119-7-a.html
Yes Cecil in december is awesome weather BUT there is also a 700lbs weight difference which IMO is a bigger deal.
https://ls1tech.com/forums/lt1-lt4-m...1-119-7-a.html
Yes Cecil in december is awesome weather BUT there is also a 700lbs weight difference which IMO is a bigger deal.
As impressive as Pats car is, it has nothing to do with this thread or anything posted in it.
Those are way too big for an RPM limited 350, but some AFR 195s would have picked up some for sure.
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i have this cam in a 383 sbc and it has run a 7.04 @99mph in the 1/8th with a 1.47 60 ft in a 94 z28....the engne is going in an s10 now....the heads are cast iron world products sportsman 2's with 1.6 rocker
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The above post was simply a statement about how you don't need the biggest shelf cam Comp offers to go fast. People too often look at results without context.
Far as "flow numbers" way to benchrace, let's look at it as "touched up" aftermarket heads and converted intake compared to GM castings.
Far as what heads would work, if ported GM heads can get that result with 14 degrees less duration.......................................... ...
Far as "flow numbers" way to benchrace, let's look at it as "touched up" aftermarket heads and converted intake compared to GM castings.
Far as what heads would work, if ported GM heads can get that result with 14 degrees less duration.......................................... ...
#15
On Pat's car yes, on your car no, lol.
#17
I'm pretty sure with a few years with my new engine it will be running a lot better. Nobody runs good out of the box. It takes time.
#18
i had that cam on a 383 with home ported LT4 heads. full weight, 6 speed. 1.7 60 foot.
ran a 12.0 at 115.
it might have ran slightly faster, but i ran out of gear just before the end of the track.
ran a 12.0 at 115.
it might have ran slightly faster, but i ran out of gear just before the end of the track.
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aww come on. you mean you have to work at to get these things to run like they do. by the way some of these guys post all you have to do is slap a cam in it and get a mail order tune and your all set to run tens.