RPM launch chip?

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01-22-2008, 03:33 PM

#11

hammertime

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Join Date: May 2003

Location: Coldwater, MI

Posts: 2,998

Quote:

Originally Posted by shawnp

I agree with Dave except on the spragless convertor. Have not been a big fan of them but I know Dave has had exceptional luck with his. To each there own. I think the gear is a little much as well and suggest the 4.11 gear.

The cam that is in our 555 is a Reher Morrison uses. It is an Erson custom ground cam. Duartion is 284/298 and lift is 808/765 at 112 center. It will be a 7/4 swap set up. Your cam could be a little bigger but is a decent application.

Your heads may want to see a little more RPM to work the motor. I am sure Dave is suggesting more RPM at the shift point for this reason. Even at 7000-7200 that is conservative for that head. What size header are you running? I would think the 2 3/8" should be what is on it.

I run the same cam Shawn does its a very good cam. Shawn caught onto my rpms with them heads they do like the rpm's and will help that motor.

01-22-2008, 03:38 PM

#12

topcat572

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Join Date: Nov 2004

Location: Port Sulphur, La.

Posts: 139

chip

thanks for all of you that respond. i understand what all of you are doing. the headers are the edelbrock 2 1/4 dia. a lot has changed in the last 12 yrs, wow. this combo at the time was pretty impressive in 1995 when i built it. through a series of unfortunate occurrences, wreck and hurricane, we are just going again. ran the car 1/8 mile only at koc races 4 times. this was more a torqe combo than high rpm. thats why we went with the super mod port, for the torque. shafiroff recommended the 7000 rpm max. good bottom end, lunati pro crank, oliver rods[sorry david] lol and weisco pistons. 3.89 was to help lower the rpm. looks like we ll need a gear and converter change to run wiyh yall big dogs. at rebuild time if everthing is good i ll take it out to the 598.thanks all

01-23-2008, 05:17 AM

#13

3dracing

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Join Date: Mar 2003

Location: Dothan Al.

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My motor is a 4.5x4.5 also. We have a 598 in another dragster and the 572 runs faster.

Steve

01-23-2008, 08:23 AM

#14

topcat572

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Location: Port Sulphur, La.

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572

What timing do you run on both engines? Does the 572 make more power or is there a difference in the two chassis? What stall are you using, thanks, TC