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Purple shaft question...
#1460705
07/01/13 01:57 AM
07/01/13 01:57 AM
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Joined: Jun 2010
Posts: 311 Colorado Springs, Colorado
Dartthunder340
OP
enthusiast
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OP
enthusiast
Joined: Jun 2010
Posts: 311
Colorado Springs, Colorado
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I have a .590 for my small block and the lash is recommended to be set at .28/.30 cold. How much can I tighten or loosen this up and be safe? Could someone explain why these are set up to have that much lash in them? Thank you.
Better get inside Ma. Looks like a storm's comin'.
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Re: Purple shaft question...
[Re: Dartthunder340]
#1460706
07/01/13 02:13 AM
07/01/13 02:13 AM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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I havent run that cam but I do have a roller that calls for 28/30 lash... right now I have it set at 18/18 with alum heads... hot
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Re: Purple shaft question...
[Re: 77DragracerR/T]
#1460712
07/21/13 10:59 AM
07/21/13 10:59 AM
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Joined: Nov 2003
Posts: 7,348 Mt.Vernon ,Ohio
VernMotor
master
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master
Joined: Nov 2003
Posts: 7,348
Mt.Vernon ,Ohio
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Quote:
I run that cam in my 408 and I set it 28/32 and the car is very consistant with that setting and has been problem free.I've heard of racers running them tighter but I just don't want the failure problems.
Why do you think you would have failure problems ?
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Re: Purple shaft question...
[Re: Dartthunder340]
#2299614
05/05/17 04:52 PM
05/05/17 04:52 PM
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Joined: Jun 2010
Posts: 311 Colorado Springs, Colorado
Dartthunder340
OP
enthusiast
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OP
enthusiast
Joined: Jun 2010
Posts: 311
Colorado Springs, Colorado
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Hello everyone, hope all is well! I wanted to bump and revisit this. Was wondering if anyone else was running lash different than the .28/.30 Mopar recommendation? I still have my same combo of Aries domed pistons/ open chamber W2's and the .590 Purple Shaft. I did set it to .25/.25 cold and didn't notice any difference. I would like to go a lot tighter (.18/.20?) to see if there would be gains. Do you see any possible issues? Thanks again for your help!
Better get inside Ma. Looks like a storm's comin'.
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Re: Purple shaft question...
[Re: Dartthunder340]
#2299937
05/06/17 08:47 AM
05/06/17 08:47 AM
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Joined: Jan 2003
Posts: 17,918 Akron, Ohio
ProSport
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 17,918
Akron, Ohio
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I've seen alot of guys tighten the lash up on the 590 cam with good results but it never helped mine, it liked 28/32 in my 451 with Eddy heads and it was a 9 second bracket car. Maybe it just didn't like the extra lift since it was a mild combo with low compression.
1970 Challenger, all aluminum 528 Hemi, HDK suspension, Tremec 5 speed manual
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