Here's the formula:
(Cam Lift/Rated Rocker Ratio)* New Rocker Ratio
In other words: (.512 / 1.6) * 1.7 = .544
I did this "conversion" to my V6 - made about 10 more HP and 10 TQ - only
thing I had the machine shop do was make sure there's no spring bind (wasn't
any in my case).
- Bernd
-----Original Message-----
From: owner-dakota-truck@bent.twistedbits.net
[mailto:owner-dakota-truck@bent.twistedbits.net] On Behalf Of Mike Sykes
Sent: Wednesday, November 10, 2004 6:52 PM
To: dakota-truck@dakota-truck.net
Subject: DML: Re: 1.6 vs. 1.7 rr's
>>Currently I have a 604 Competition Cams:lift .512 dur@.050 210, 220 /
>>LSA
112. I know the 1.7's will fit in my MP valve covers but will they have any
benefit due to the lift already built into the cam?<<
I was told by apretty reliable source when I built my 360 that the 604 and
1.7's is too much lift and that I'd be hard pressed to find a valve spring
that'll stand up to it. I was also told that I would probably lose power.
The lift on the Comp cam is calculated for 1.5 rockers, so you'll already
have more than .512 lift with the stockers. I don't remember the formula to
figure out what the lift will be, but it's ridiculously high with 1.7's. I
wouldn't do it, but then again, I wasn't building a 408. =)
-miggity
Newport News VA
2000 FR R/T CC
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