seawalkersee
06-02-2007, 12:12 AM
I think this is the right place for this thread. Any help would be great. I have a 357 with a smallish cam. Its a 357 with a built lower end. The cam is only like a .498/.498 with 1.7 rockers. I have a dual plane intake. The engine is built primarily for torque. I am running a 4 spd and cant seem to find any suggestions anywhere.
Here we go. I started with an edelbrock carb. I am not sure what size, but no matter what combo of jets, rods, and springs I used they all had problems. I could only figure that I was getting too much air between the throttle shafts. I dont have the formula right off hand now, but it ended up being like the use of a 590 cfm setup when I used the carbed .85 VE for it. I tried to use the smallest jets I could find which netted the EXACT same results. I got pissed off and swapped over to a Holley. Same results. Basically, I can "pump" the carb and gain speed. But once I get going, it falls off. Now I can try to keep pumping it, but after you build a few RPM, you can not just pump it with a manual tranny and have good results. I have MSD and am running a gear drive. I made SURE I had a good ground today by running a seperate one and still have the same resutls. I found that with the Holley, I can spray brakekleen on the throttle shafts and have it smoke white directly afterwords leading me to believe the shafts have too much play in them. They are smallish jets too (64s I believe) which would be a 650ish setup. Can anyone else think of anything that would be causing this to have NO tip in power? I am eventually going to try to run EFI so I can blow it with one of my spare blowers, so I dont really want to spring for a new carb.
Oh, the cam is advanced 2* which was all the gear drive would allow. It idles smooth and I can dial it in. With the Holley, I am sure it is toast because there is NO way to lower the idle anymore. The screw (for the throttle) is backed all the way out.
Any help would be great.
Chris
Here we go. I started with an edelbrock carb. I am not sure what size, but no matter what combo of jets, rods, and springs I used they all had problems. I could only figure that I was getting too much air between the throttle shafts. I dont have the formula right off hand now, but it ended up being like the use of a 590 cfm setup when I used the carbed .85 VE for it. I tried to use the smallest jets I could find which netted the EXACT same results. I got pissed off and swapped over to a Holley. Same results. Basically, I can "pump" the carb and gain speed. But once I get going, it falls off. Now I can try to keep pumping it, but after you build a few RPM, you can not just pump it with a manual tranny and have good results. I have MSD and am running a gear drive. I made SURE I had a good ground today by running a seperate one and still have the same resutls. I found that with the Holley, I can spray brakekleen on the throttle shafts and have it smoke white directly afterwords leading me to believe the shafts have too much play in them. They are smallish jets too (64s I believe) which would be a 650ish setup. Can anyone else think of anything that would be causing this to have NO tip in power? I am eventually going to try to run EFI so I can blow it with one of my spare blowers, so I dont really want to spring for a new carb.
Oh, the cam is advanced 2* which was all the gear drive would allow. It idles smooth and I can dial it in. With the Holley, I am sure it is toast because there is NO way to lower the idle anymore. The screw (for the throttle) is backed all the way out.
Any help would be great.
Chris