I have 1.6 roller rockers, guide plates, beefed springs and retainers, and I
take it to 6 grand daily. on a stock motor however, you don't make power
that far, but my cam is ground up that high. actually, it's still pulling a
6 grand, but I don't think it's be good to take it past that without more
work done to the motor.
----- Original Message -----
From: Bob Tom <tigers@bserv.com>
To: <dakota-truck@buffnet.net>
Sent: Wednesday, April 05, 2000 7:09 PM
Subject: Re: DML: Re:Re: Lower Gears and Highway Cruising
> At 01:04 PM 4/5/00 -0500, you wrote:
> >Any comments from other DML'ers about this rpm range being achieved
safely
> >many times over? With the full rocker upgrade of course.
> >GS -
>
> I've got the MP lifters, retainers, beefed pushrods, guides, valve springs
> and 1.6 al. roller rockers. I've hit 6000 rpm on many occasions on the
> track. Not by choice but because it would not shift out of second using
> the manual shift technique. Don't like it but I probably would have had
> many bent valve stems and/or tattooed piston heads without the beefed
valve
> train.
>
> The valves will float at this rpm without the MP valve springs ...
> happened to me on a few occasions before I had MP springs in but backed
off
> immediately and no damage.
>
> BTW, running it to these rpms does nothing for better ETs, as
> I'm sure everyone knows ... makes noise and extra wear though.
> With the MP Magnum R/T cam, peak hp is around 4600-4800 rpms, meaning
> optimal shift points are around 5100-5300 rpms.
>
> An aside. Last Sat. at the track, I had the 2-3 shift problem again.
> Looked at the recorded frames of the run on the scanner, I reached a
> tick below 6000 rpm in second before I was able to get the shift
> ... mph show 104 when the shift was made.
>
> Just my unwanted experiences.
>
> Bob. Southern Ontario, Canada.
> '97 Dakota CC Sport, FR, 5.2L, 3.55 SG, auto.
>
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