LT1-LT4 Modifications 1993-97 Gen II Small Block V8

thoughts on comp xfi

Thread Tools
 
Search this Thread
 
Old Jul 19, 2009 | 04:03 PM
  #1  
edunegan's Avatar
Thread Starter
Staging Lane
 
Joined: Apr 2009
Posts: 55
Likes: 0
From: bokchito
Default thoughts on comp xfi

pt# 07-468-8 292-300 584/579 in a 383
Reply
Old Jul 19, 2009 | 05:31 PM
  #2  
slownova73's Avatar
TECH Enthusiast
iTrader: (31)
 
Joined: Jun 2008
Posts: 598
Likes: 0
From: Asheboro NC
Default

Originally Posted by edunegan
pt# 07-468-8 292-300 584/579 in a 383
thats the one im putting in mine, theres are alot of mixed reviews about it, but i like it personally, its a high rpm cam, with great mid range and is also good for blowers or nitrous!
Reply
Old Jul 20, 2009 | 04:08 AM
  #3  
gregrob's Avatar
TECH Senior Member
iTrader: (8)
 
Joined: Sep 2008
Posts: 5,130
Likes: 4
From: 6,000+ feet
Default

I like the XFI lobe profile a lot. Just use good quality valvetrain parts and you'll be fine. The ones who bad mouth the aggressive lobes try to use junk in the valvetrain

Cant say of that cam will work good for you or not without knowing what heads youre going to run, the rest of your setup, etc.
Reply
Old Jul 20, 2009 | 11:27 AM
  #4  
ss.slp.ls1's Avatar
TECH Senior Member
15 Year Member
iTrader: (36)
 
Joined: Jan 2008
Posts: 8,184
Likes: 28
From: Orange County, CA
Default

Sounds like a nice choice for a 383. As stated, use quality valve train parts.
What ratio rocker arms are you going to use? If 1.6, make sure you get springs that can reliably handle up to .650 lift paired with those aggressive xfi lobes.
Reply
Old Jul 20, 2009 | 02:16 PM
  #5  
slownova73's Avatar
TECH Enthusiast
iTrader: (31)
 
Joined: Jun 2008
Posts: 598
Likes: 0
From: Asheboro NC
Default

Originally Posted by gregrob
I like the XFI lobe profile a lot. Just use good quality valvetrain parts and you'll be fine. The ones who bad mouth the aggressive lobes try to use junk in the valvetrain

Cant say of that cam will work good for you or not without knowing what heads youre going to run, the rest of your setup, etc.
Originally Posted by ss.slp.ls1
Sounds like a nice choice for a 383. As stated, use quality valve train parts.
What ratio rocker arms are you going to use? If 1.6, make sure you get springs that can reliably handle up to .650 lift paired with those aggressive xfi lobes.

What they said!^^^^
Reply
Old Jul 20, 2009 | 05:41 PM
  #6  
edunegan's Avatar
Thread Starter
Staging Lane
 
Joined: Apr 2009
Posts: 55
Likes: 0
From: bokchito
Default

i'm looking at the afr's 195 eliminators, and yes its 1.6 rr
Reply
Old Jul 20, 2009 | 05:44 PM
  #7  
gregrob's Avatar
TECH Senior Member
iTrader: (8)
 
Joined: Sep 2008
Posts: 5,130
Likes: 4
From: 6,000+ feet
Default

Originally Posted by edunegan
i'm looking at the afr's 195 eliminators, and yes its 1.6 rr
street or competition ported?

Those heads keep right on flowing past .600 lift. I'd get a little more lift out of the cam to take advantage of that flow.
Reply
Old Jul 21, 2009 | 01:28 AM
  #8  
JAKEJR's Avatar
TECH Regular
 
Joined: Apr 2007
Posts: 420
Likes: 0
From: Kempner, TX
Default

GM High Tech Performance magazine just ran a series of dyno tests using the 467 XFI (Which is one step down from the one you're considering. It's 230/236@.050) comparing various LT1 heads. Engine was a 383.

The AFR 195 Eliminators- out of the box, not the Competition version - made about 516 HP (from memory) and beat out the other heads being tested. The entire test is on GMHTP'S website.

According to CompCams Tech engineer, Godbold, the XFI series of lobes are the best lobes CompCams has done to date.

Jake

West Point ROCKS!
Reply
Old Jul 21, 2009 | 05:20 AM
  #9  
96capricemgr's Avatar
11 Second Club
iTrader: (1)
 
Joined: Sep 2004
Posts: 11,975
Likes: 15
Default

Test was invalid, they tuned with one head, probably the AFR and then left the timing untouched with every subsequent head tested. Used a LOT of timing at that and when we discussed it one member even pointed out that his car loses 20hp with just 2 degrees too much timing. So it was no small flaw to the test.

Not saying anything good or bad about any of the products, just saying the test was meaningless.
Reply




All times are GMT -5. The time now is 01:26 AM.