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Discussion Starter · #1 · (Edited)
Hey everyone, I'm wanting to rebuild the top end of my motor and slide in a new cam and lifters but after talking to crane cams a guy there said i have to "shave off welds near the throttle bodies in order to adjust a screw for the flow". :wtf: Never installed a cam much less valve seals so any help on this subject would be appreciated :D

i looked around online and found nothing of having to do this i could have overlooked something tho plus this is my first vette ever (and it has the crossfire).

Before i buy the parts and begin i thought i'd bring it by you guys and see if there are any steps i need to be aware of while putting a cam in a crossfire engine.

-thx jordan
 

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Before i buy the parts and begin i thought i'd bring it by you guys and see if there are any steps i need to be aware of while putting a cam in a crossfire engine.
You are aware a cam will do little for a CFI engine while you still have the restrictive stock intake in place?

CFI intake at top ; reg SBC intake below










Porting your intake would give much better results .See ; http://www.technovelocity.com/chevyhackers/tech_articles/port_polish/port_polish.html
 

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Discussion Starter · #3 · (Edited)
Of course, but the cam that is in it now is showing it's age and its time to replace.

Once i have the Intake off i'll prolly port it, does this interfere with the crossfire injection? at least till i get my renegade intake :D
 

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Of course, but the cam that is in it now is showing it's age and its time to replace.

Once i have the Intake off i'll prolly port it, does this interfere with the crossfire injection? at least till i get my renegade intake :D
there a severe limit on how much you can port it.. you see VetteOz s comparison pics? the X Fire just can t flow enough to support a bigger cam.. ..Renegades are better, but you could be waiting a very long time for one...Toobroke got one of the first ones out, but waited forever ..
 

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there a severe limit on how much you can port it.. you see VetteOz s comparison pics? the X Fire just can t flow enough to support a bigger cam.. ..Renegades are better, but you could be waiting a very long time for one...Toobroke got one of the first ones out, but waited forever ..

Fish, the only reason I had to wait so long was because it was still being designed and then the tooling had to be made. Then they had to find a foundry that was willing to cast small numbers. I believe they're now working with a small foundry in California.
 

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yeah toobroke, I remember ...so, .I just looked on their site ...this is what it says......."NEWS-- UPDATE: 3/9/13 AWESOME NEWS!! We have evaluated the manifold sent to us with the final machining process completed and have determined that it is OK and ready to go on the production machining. We have given the company a GREEN light to start cranking them out."....."3/27/13..TEMPORARILY AVAILABLE ONLY TO CURRENT WAITING LIST CUSTOMERS"....so still gonna be a long wait for one
 

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yeah toobroke, I remember ...so, .I just looked on their site ...this is what it says......."NEWS-- UPDATE: 3/9/13 AWESOME NEWS!! We have evaluated the manifold sent to us with the final machining process completed and have determined that it is OK and ready to go on the production machining. We have given the company a GREEN light to start cranking them out."....."3/27/13..TEMPORARILY AVAILABLE ONLY TO CURRENT WAITING LIST CUSTOMERS"....so still gonna be a long wait for one
**YAWN**
This story is about 5 years old now
 

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Hello xCrossFirex - I have just gone through what you are looking to do. I have had my car sitting in my garage for years planning my attack and finally got to it. I notice your post is about 6 months ago so don't know if I'm too late to respond but if you haven't started I have learned a ton that may be helpful. Just to let you know I chose to go with porting a set of cheap L98 heads and a Lunati Cam with .490 lift and a ton of duration and don't regret the outcome. The intake will be the limitation as everyone has already posted, but if your just looking for some cheap horsepower and a fun car it's well worth all the work.
 

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This is one of the biggest issues with the L83. The head side opening can be ported to match however the runner size can only be opened up to about 2 thirds of the head end of the runner. But... if your just looking for a healthy street car. it's not so bad. Going to a large cam and higher compression heads will affect the readings to the ECM and will affect timing advance among other things. I would recommend a vacuum advance or mechanical advance distributor. You will have to pull out the idle adjuster plug to have access to mechanical idle settings. Also, you mentioned grinding off the factory TBI balance weld that stops from fooling around with that adjustment; i would grind that off also. All part of tuning. I am using a set of cheap ported L98 heads with a long duration cam and good valve springs running on pump gas with no smog and the car has come to life. I would also recommend a 160* thermostat and a 175* fan switch. 1985 fuel pump. The best thing about this car is that you can do it all on jack stands.
 

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Open them up as much as you can. As you can see the middle of the runner will be the air flow obstacle. But even though... with the stock TBI's, it now pulls very hard. Heads and cam (among other things) have brought this thing to life.
 

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Bolt the 2 iron heads together then bolt the intake to them - very solid for porting.
 

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Discussion Starter · #17 ·
Hey XFIRE, seen your post! i have not done the cam swap yet but hopefully this winter i will!! The cam i have chosen is from Comp cams (all my parts are stored to lazy to get the specs today). It is suppost to be a little above factory and give me a nice sound and not mess with the ECM. i think i have my mind set on rebuilding the entire engine back with goodies while keeping the crossfire intake remove the air pump and stock headers. My goal is to get around 300 to 350 hp with the intake setup i do not really care for much more speed than that, more of a focus on mpg and reliability,.
 

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CrossFire Knowledge

Hey XFIRE, seen your post! i have not done the cam swap yet but hopefully this winter i will!! The cam i have chosen is from Comp cams (all my parts are stored to lazy to get the specs today). It is suppost to be a little above factory and give me a nice sound and not mess with the ECM. i think i have my mind set on rebuilding the entire engine back with goodies while keeping the crossfire intake remove the air pump and stock headers. My goal is to get around 300 to 350 hp with the intake setup i do not really care for much more speed than that, more of a focus on mpg and reliability,.

I have been experimenting with and racing CrossFires for 26 years so I know most everything about them; namely squeezing power out of them. E-mail me at [email protected] and I'll share my knowledge with you.
 
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