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Identifying INDY rocker arm ratio? #710839
05/29/10 02:50 PM 05/29/10 02:50 PM
Joined: Sep 2008
Posts: 287
united kingdom
B
blown360 Offline OP
enthusiast
blown360  Offline OP
enthusiast
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Joined: Sep 2008
Posts: 287
united kingdom
Were trying to order some T&D rockers after busting an INDY rocker but unsure of the ratio. Is there an easy way of finding out? We dont have much info on this motor. The heads are 440-EZ 295'S and have black INDY rockers on them.
Re: Identifying INDY rocker arm ratio? [Re: blown360] #710840
05/29/10 03:05 PM 05/29/10 03:05 PM
Joined: Feb 2007
Posts: 6,295
U.S.
M
moparniac Offline
master
moparniac  Offline
master
M

Joined: Feb 2007
Posts: 6,295
U.S.
black 1.5 blue 1.6... some will verify this im sure though....

Mopar Performance
Re: Identifying INDY rocker arm ratio? [Re: moparniac] #710841
05/29/10 06:46 PM 05/29/10 06:46 PM
Joined: Dec 2006
Posts: 4,647
aotearoa
rebel Offline
master
rebel  Offline
master

Joined: Dec 2006
Posts: 4,647
aotearoa

Re: Identifying INDY rocker arm ratio? [Re: blown360] #710842
05/29/10 10:15 PM 05/29/10 10:15 PM
Joined: Aug 2003
Posts: 43,157
Bend,OR USA
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Cab_Burge Offline
I Win
Cab_Burge  Offline
I Win
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Joined: Aug 2003
Posts: 43,157
Bend,OR USA
If you knw the cam lobe lift you can set the lash at zero and open the valve all the way by turning the cranksahft with a dial indicator on the retainer(make sure the dial indicator stem is on the same angle as the valve stem from left to right and front to back)and take the net valve lift and do the math. IE .400 lobe lift times 1.5 = .600, 1.6 times .400 = .640. Don't be suprised if the ratio are off some

Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: Identifying INDY rocker arm ratio? [Re: Cab_Burge] #710843
06/02/10 11:55 AM 06/02/10 11:55 AM
Joined: Nov 2009
Posts: 190
WI
mopar873 Offline
member
mopar873  Offline
member

Joined: Nov 2009
Posts: 190
WI
Sledgehammer is correct. Indy Blacks are 1.5.

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