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Topic: crossfire porting

in Forum: C3 Fuel, Emission Control, and Exhaust Systems


crossfire porting

Posted: 7/15/05 1:01pm Message 1 of 5
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Saxonburg, PA - USA
Joined: 11/14/2003
Posts: 143
Vette(s): 1982 Black over red, doing a resto.

Has anyone played around with porting a crossfire intake?

I've read some about it, but, seems everyone has a different idea.

I had a problem with the heads bending the pushrods, seems the castings are bad. Should be getting new castings in a week or two. Since I have the manifold off, I started to play with it. I didn't do a gasket match, only opened the ports to 1 9/16 in., and cut the egr port off the manifold and rounded any sharp edges.

I guess it will run better or worse.

Denny




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crossfire porting

Posted: 7/15/05 2:36pm Message 2 of 5
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Frederick, MD - USA
Joined: 9/8/2003
Posts: 3398
Vette(s): 1969 convertible L71 427/435 4-speed black interior
From what I've read about the Crossfire system the biggest block to making power is its induction system. The general consensus from what I see is that there's not much that can done about it...it's unfortunately the nature of the beast.    The aftermarket pretty much ignores it as it wasn't used for very long plus its inherent limitations, regardless of how well it can run...it just can't be modified much for making extra power without scrapping the whole system and taking a different route for power mods.


crossfire porting

Posted: 7/15/05 6:05pm Message 3 of 5
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Duncanville, TX - USA
Joined: 11/8/2003
Posts: 20214
Vette(s): #1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas
Yeah, there's just not enough meat in the right areas to do any good with porting. The ports are just too small, but that's the only way they could get the intake under the hood. I've heard that having it "extrude honed" is about the best you can do, but it's still not worth the $$$


Joel Adams
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crossfire porting

Posted: 7/22/05 3:41pm Message 4 of 5
Former Member
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Saxonburg, PA - USA
Joined: 11/14/2003
Posts: 143
Vette(s): 1982 Black over red, doing a resto.

I know it's not the best setup, but it does have fuel injection. I do not want a carb. I thought maybe someone out there tried to modify a crossfire to gain a little more power.

Denny




crossfire porting

Posted: 7/23/05 7:13am Message 5 of 5
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Yucaipa, CA - USA
Joined: 4/7/2004
Posts: 120
Vette(s): 1962 Honduras with black, 4speed, 340 horse, stock (sold!) 1982 Coupe, Red on red, stock (sold!)
Take a look at the X-Ram option at www.x-ram.com . True, the crossfire was only used for 2 years on the vette, but it was used for years on Firebirds and Camaros along with many other GM models. Using an x-ram system, you can use larger TB's and increase your CFM flow a ton. Oh, and the best part, still have over 20mpg. For more info on the crossfire system check out www.crossfire.homeip.net . That is the home page for the Crossfire Forum. Hope this helps82crossfire38556.305474537


in Forum: C3 Fuel, Emission Control, and Exhaust Systems


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