The 1.7/1 rockers do develop more lift but more important, they give you faster lift rates. If you have a cam with a lift figure at the cam of say .325, with 1.6 rockers, your valve lift is .520, with 1.7's, the valve lift will be .552. If you measure the duration at .250 valve lift, the increase in duration is about 3 degrees. With a change from 1.6 to 1.7's, you can expect to see an additional 10-20 HP. There doesn't appear to be any alignment problems caused by the 1.7's, but there is a variance in stud location from Dodge. I went through 5 bare heads just to get a pair that I was happy with. Bottom line on any rocker install, make sure the rocker centers on top of the valve......
Frank
---------------------- Forwarded by Frank T Holloway/CA/KAIPERM on 01/17/2000 07:38 AM ---------------------------
TEDSDAKOTA@aol.com on 01/16/2000 03:10:00 PM
To: dakota-truck@buffnet.net@Internet
cc: (bcc: Frank T Holloway/CA/KAIPERM)
Subject: Re: DML: Re: 1.7 v. 1.6 roller rockers --attn: Bob
In a message dated 1/16/2000 2:38:06 PM Pacific Standard Time,
fawcett@uism.bu.edu writes:
<< The reason that I chose to go with the 1.6 roller rockers was the
durability factor over a long period of time while getting
the engine to high rpms in the shortest time possible (track).
Can I prove it? NOPE.
Hope this helps.
Bob. Southern Ontario, Canada.
'97 Dakota CC Sport, FR, 5.2L, 3.55 SG, auto.
>>
thanks Bob you saved me $500+ rockers+ valve covers,,,,,.....
BUT WHAT NOW !!!!!
Ted O.
99 SLT + 4X4, Powerdyne SC'er, Leach headers, Gibson stainless catback,
TransGo shift kit, R&D TB, K&N, Taylor wires, Autolite 3923's, 4.10's front
and rear, Hoosier Drag slicks, Msd Boost retard ignition, Auto meter Boost
gauge, Beer cooler...
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