Crossfire engine rebuild recommendations
Thread Starter
Burning Brakes
Joined: Mar 2007
Posts: 901
Likes: 1
From: Jackson Michigan
Crossfire engine rebuild recommendations
I am considering having the 350 crossfire rebuilt this winter and am wondering what some people have done to their Crossfire Corvette engines. 
Will the stock computer handle chores if the engine was bumped up to a 355 with a little better cam? I do plan on keeping my own engine and having the work done to it rather then buying a short block. (brother in law will do the work) I also will be keeping the crossfire intake but will be porting it.
My Crossfire is a daily driver and I do take her on some nice drives now and then. The cars engine has been very reliable except for when the harmonic balancer went out.
I also figured I would post this in the C3 section since you guys have a couple more years on us C4 Crossfires.
Thanks,
Mark
Will the stock computer handle chores if the engine was bumped up to a 355 with a little better cam? I do plan on keeping my own engine and having the work done to it rather then buying a short block. (brother in law will do the work) I also will be keeping the crossfire intake but will be porting it.
My Crossfire is a daily driver and I do take her on some nice drives now and then. The cars engine has been very reliable except for when the harmonic balancer went out.
I also figured I would post this in the C3 section since you guys have a couple more years on us C4 Crossfires.
Thanks,
Mark
Team Owner
Joined: Jan 2006
Posts: 37,637
Likes: 3,118
From: Crossville TN
If the engine was running reasonably well when you started the rebuild, why not just leave the CrossFire induction system 'as is'. If you think the throttle bodies need rebuilding, DIY or ship them off to a rebuilder. In answer to one of your questions, the existing ECM can determine what needs to be done with your fuel management, but if you change the system, it will have no way to control any new induction equipment you have. Now, if you are clever enough to adapt the fuel control linkage for the throttle bodies to the new carb/FI hardware, more power to you!
Le Mans Master
Joined: Jun 2004
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From: Seattle WA
St. Jude Donor '14
Melting Slicks
Joined: Sep 2001
Posts: 2,501
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From: Sunshine State, USA
Senior Member
Cruise-In V Veteran
Might want to talk to these guys: http://crossfireinjection.net/
That is just what I was about to suggest. Those guys are certainly the Crossfire experts.
Race Director
Joined: Apr 1999
Posts: 11,520
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From: CORVETTE 77 385 C.I. TEXAS
Mark
The problem is the intake designed for torque on a 305.
I suggested a long time ago to try 2 4bl. intake.
Monty a crossfire expert who tried a lot has said he figures the fuel system (not the intake) is good to 300.
The problem is the intake designed for torque on a 305.
I suggested a long time ago to try 2 4bl. intake.
Monty a crossfire expert who tried a lot has said he figures the fuel system (not the intake) is good to 300.
Melting Slicks
Joined: Sep 2001
Posts: 2,501
Likes: 35
From: Sunshine State, USA
Senior Member
Cruise-In V Veteran
DCS, the company listed in the link, now makes a new Renegade intake for the Crossfire. The also have cam recommendations, chips, etc, to bump up your power. I would like to partake of their services someday...
Le Mans Master
Joined: Jul 2000
Posts: 6,664
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From: columbia city in
porting out your intake will help a lot .putting in a better cam will help .rocker arms is a plus .the best thing you can do is a good set of heads.you should put in a new 1985 vette fuel pump .reset fuel pressure regulator to 14psi.check here for the new intake and other partshttp://crossfireinjection.net/and become a member herehttp://www.crossfire.homeip.net/index.php?act=idxyou can find what you need there.
Team Owner
Joined: Jan 2006
Posts: 37,637
Likes: 3,118
From: Crossville TN
I had a [new] 1984 with the CrossFire system. I had it up over 135mph at one time {that was enough, actually}, so it's not a total lump of dung. If you are wanting to race the car, I'm not sure why you bought a car with the limitations of the CrossFire induction system. If you just want a reliable car that runs and idles well and has more than enough power for a good peppy ride, the stock CF system is just fine.
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Thread Starter
Burning Brakes
Joined: Mar 2007
Posts: 901
Likes: 1
From: Jackson Michigan
If the engine was running reasonably well when you started the rebuild, why not just leave the CrossFire induction system 'as is'. If you think the throttle bodies need rebuilding, DIY or ship them off to a rebuilder. In answer to one of your questions, the existing ECM can determine what needs to be done with your fuel management, but if you change the system, it will have no way to control any new induction equipment you have. Now, if you are clever enough to adapt the fuel control linkage for the throttle bodies to the new carb/FI hardware, more power to you!
Thread Starter
Burning Brakes
Joined: Mar 2007
Posts: 901
Likes: 1
From: Jackson Michigan
porting out your intake will help a lot .putting in a better cam will help .rocker arms is a plus .the best thing you can do is a good set of heads.you should put in a new 1985 vette fuel pump .reset fuel pressure regulator to 14psi.check here for the new intake and other partshttp://crossfireinjection.net/and become a member herehttp://www.crossfire.homeip.net/index.php?act=idxyou can find what you need there.
The 85 fuel pump was done by the previous owner.
Thread Starter
Burning Brakes
Joined: Mar 2007
Posts: 901
Likes: 1
From: Jackson Michigan
I had a [new] 1984 with the CrossFire system. I had it up over 135mph at one time {that was enough, actually}, so it's not a total lump of dung. If you are wanting to race the car, I'm not sure why you bought a car with the limitations of the CrossFire induction system. If you just want a reliable car that runs and idles well and has more than enough power for a good peppy ride, the stock CF system is just fine.
Thread Starter
Burning Brakes
Joined: Mar 2007
Posts: 901
Likes: 1
From: Jackson Michigan
Safety Car
Joined: Mar 2007
Posts: 3,652
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From: Bridgewater nj
When I do my crossfire, I'm going for all the torque I can get under 5300rpm. Trying to make a crossfire scream is like snorkelling with a straw.
Some alum. with a small chamber for compression and a mild cam will work well
Some alum. with a small chamber for compression and a mild cam will work well
Le Mans Master
Joined: Oct 2010
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From: melbourne florida
2023 C3 of the Year Finalist - Modified
i doubt it will make any power at 5300 r.p.m the heads and intake have rediculous ports that wont support the power. how labour swapping to a t.p.i?
