pullintheTriggger
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Joined: Jan 2019
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pullintheTriggger
im doin it ,goin for the AFR heads 180 64 or 70 cc I have heard enough about them and talk to others who put them in there vette ,in my 82 ill be putting the renegade intake and a set of AFR we r goin to leave the cam rite now its really worth changing u really cant go to radical on them makes it a lot harder to tune from what im told.. maybe you heard diff no emissions on car now, has headers and sidepipes I want to try to keep my Xfire on though putting roller rockers on ill need a tall valve cover have a feeling that will cause problem with xfire?
Is my vette stock?? HAHA
Joined: Oct 2015
Posts: 20,116
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From: Im not allowed to tell you
2020 C3 of the Year Finalist - Modified
2020 Corvette of the Year Finalist (performance mods)
2019 C3 of Year Winner (performance mods)
2016 C3 of Year Finalist
I would go with the 64cc head to up your compression but you may need to run higher octane
Melting Slicks
Joined: Aug 2003
Posts: 3,414
Likes: 288
From: dayton oh
So here's your dilemma: you already have a 9.0:1 motor with 76cc heads, the 70cc AFR would get you 9.6:1, the 64cc would make 10.3:1.
The most duration the CPU can handle is ~212 on the intake side which would be a 9.5 CR cam -- going with 1.6RRs could give you more lift out of your stock 9.0:1 cam
What you are not mentioning is your fuel system upgrade plan - it was designed to support 200hp and it could barely feed that. You need a FPump upgrade and maybe injectors too
Should be a powerful combo
The most duration the CPU can handle is ~212 on the intake side which would be a 9.5 CR cam -- going with 1.6RRs could give you more lift out of your stock 9.0:1 cam
What you are not mentioning is your fuel system upgrade plan - it was designed to support 200hp and it could barely feed that. You need a FPump upgrade and maybe injectors too
Should be a powerful combo
Pro
Joined: Mar 2014
Posts: 529
Likes: 113
From: Texas
The 5550 ECM should be upgraded. The problem currently is the only option is a 7747. None of the 5550 or 6026 ECMs are being produced or rebuilt.
Here is what I recommend.
1. Heads
2. Cam (convert to roller)
2. 7747 ECM (http://www.dynamicefi.com/EBL_Flash.php)
Move ECM out of battery box into equipment bay under rear glove box, you will have to re-pin wires to 7747 ECM so this is the time to move it.
3. You already have headers.
4. Your going to Renegade, just port match the heads and intake, it will be very little material if any at all.
5. External fuel pressure regulator, parallel plumed.
6. Larger TBI injectors 90# in both.
6. Clean up the TBIs or have them bored out. (be careful not to go to large)
Here is what I recommend.
1. Heads
2. Cam (convert to roller)
2. 7747 ECM (http://www.dynamicefi.com/EBL_Flash.php)
Move ECM out of battery box into equipment bay under rear glove box, you will have to re-pin wires to 7747 ECM so this is the time to move it.
3. You already have headers.
4. Your going to Renegade, just port match the heads and intake, it will be very little material if any at all.
5. External fuel pressure regulator, parallel plumed.
6. Larger TBI injectors 90# in both.
6. Clean up the TBIs or have them bored out. (be careful not to go to large)
