Crossfire Mods
Thread Starter
6th Gear
Joined: Oct 2010
Posts: 6
Likes: 0
From: Cooperstown New York
Crossfire Mods
Just got my 84 C4 on the road! After loads of cleaning and new interior. I'm looking to make her run a little stronger. I know I can port the intake, put on an 85 fuel pump, put in a lower temp thermostat,
1.6 roller rockers, long tube headers, and making the air flow. Is there any other suggestions someone can give me while I've got her apart that will give her a little more pep?
1.6 roller rockers, long tube headers, and making the air flow. Is there any other suggestions someone can give me while I've got her apart that will give her a little more pep?
Le Mans Master
Joined: Aug 2000
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From: Australia
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Team Owner
Joined: Aug 2004
Posts: 21,543
Likes: 3,216
From: Park City Utah
X2^
Doing the recipe you suggested above should net you ~250 hp though...which is a healthy improvement over stock. With regard to porting...the more you port, the more power it will make. When you think you're done, start again and do it more!
Doing the recipe you suggested above should net you ~250 hp though...which is a healthy improvement over stock. With regard to porting...the more you port, the more power it will make. When you think you're done, start again and do it more!
Thread Starter
6th Gear
Joined: Oct 2010
Posts: 6
Likes: 0
From: Cooperstown New York
Sounds good, I'm thinking about getting a spare manifold off Ebay just in case I mess up. Then I'll sell my old one after I successfully complete the swap. Any suggestions on what bits work the best.
Team Owner
Joined: Oct 2004
Posts: 81,241
Likes: 3,063
From: altered state
St. Jude Donor '05
http://www.ruffstuff.com/
This place sells the good stuff.
If you buy the cheapo $30 carbides it will be more difficult. They want to bounce around/grab more and go bad quick.
The ones I use on TPIs/LT5 are $90 a piece but last forever and cut like butter.
Usually get all of mine in 6" length then cut them down if needed for more control.
A 1/2" dia egg shaped usually gets most of it
Some 1/8 mandrel (get 2, 6" length) stragiht cartridge rolls 1" to 1-1/2" 80 grit is a good start to follow up after doing carbide cutting. Call them up tell them what youre doing they will steer you in the right drection otherwise youll end up with a bunch of stuff you cant use/dont need.
Have some real good 2 part epoxy on hand in case you go through on a CFI you just might. Not a big deal though
JBquick works alright also.
http://www.ruffstuff.com/pages/carbide.html
Try an SE5 and or SH5 2 are nice in case you bend one or want to cut one down. Try one of each
CR12 cartridge rolls get a box of straights...80 grit
If you want lower grade stuff
http://www.acutabove.com/
They have what you need and rolls, too. Cheaper but youll notice a huge difference from the good stuff. I only run over there if Im in a pinch and need something that day. Talk to Danny or Arthur
This place sells the good stuff.
If you buy the cheapo $30 carbides it will be more difficult. They want to bounce around/grab more and go bad quick.
The ones I use on TPIs/LT5 are $90 a piece but last forever and cut like butter.
Usually get all of mine in 6" length then cut them down if needed for more control.
A 1/2" dia egg shaped usually gets most of it
Some 1/8 mandrel (get 2, 6" length) stragiht cartridge rolls 1" to 1-1/2" 80 grit is a good start to follow up after doing carbide cutting. Call them up tell them what youre doing they will steer you in the right drection otherwise youll end up with a bunch of stuff you cant use/dont need.
Have some real good 2 part epoxy on hand in case you go through on a CFI you just might. Not a big deal though
JBquick works alright also.
http://www.ruffstuff.com/pages/carbide.html
Try an SE5 and or SH5 2 are nice in case you bend one or want to cut one down. Try one of each
CR12 cartridge rolls get a box of straights...80 grit
If you want lower grade stuff
http://www.acutabove.com/
They have what you need and rolls, too. Cheaper but youll notice a huge difference from the good stuff. I only run over there if Im in a pinch and need something that day. Talk to Danny or Arthur
Last edited by cv67; Jun 19, 2012 at 12:17 PM.
Team Owner
Joined: Aug 2004
Posts: 21,543
Likes: 3,216
From: Park City Utah
What he said. I used ones that looked like the top three, in the longest shaft length possible. THEN, I used a drill bit extension to get even more length.
EGR won't gain you an ounce of power. Air pump? Maybe a couple hp. More if it's failing. MUCH bigger gains are found in the porting, in your exhaust, from the manifolds back, and in timing. Those areas are where the "money's at" with CFI motors.
EGR won't gain you an ounce of power. Air pump? Maybe a couple hp. More if it's failing. MUCH bigger gains are found in the porting, in your exhaust, from the manifolds back, and in timing. Those areas are where the "money's at" with CFI motors.
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Thread Starter
6th Gear
Joined: Oct 2010
Posts: 6
Likes: 0
From: Cooperstown New York
Thanks so much for your advice. Its going to be my winter project. Its way to much fun to drive to start at that now. But I can build up my parts/tool fund now that I know what I need for the job.
Drifting
Joined: Mar 2009
Posts: 1,253
Likes: 4
From: East Wenatchee (2hours from n e where) WA
One thing I have not seen mentioned is the fuel pressure regulator. The stocker is adjustable if you remove a pressed in cap to get to it.
Im not so sure about the 85 pump. If the stock pump holds pressure you should be fine.
Im not so sure about the 85 pump. If the stock pump holds pressure you should be fine.
Team Owner
Joined: Oct 2004
Posts: 81,241
Likes: 3,063
From: altered state
St. Jude Donor '05
Am finishing up some heads this next week....may be able to send you a carbide or two and some rolls I will probably never use if you like.
Got too much of this stuff laying around and want a few new bits
Got too much of this stuff laying around and want a few new bits