Probably not. I was prepared to cut down my pushrods on Tiny Tim when I had
his engine built. It is running 10.6:1 compression ratio
and I discovered that I did not have to adjust pushrod length.
Joe
Craig Smith wrote:
>
> I got a question along this...
>
> I had the head on my 71 shaved .030, I got to thinking about the rocker
> angle to the push rods.
> I lowered the deck of the head but I didn't do anything to the rods, do I
> need to shim the rocker pedestals up to make up the diff ?
>
> -----Original Message-----
> From: Carter Shore [mailto:clshore@yahoo.com]
> Sent: Friday, March 02, 2001 8:16 AM
> To: Terry Thompson; spitfires@autox.team.net
> Subject: Re: duh my camshaft question
>
> Terry,
> I lived with an A-6 cam in a sreet driven Spitfire for
> a year or so.
> It was a basically race prepped 1147 motor. I commuted
> in expressway and stop and go traffic, from the 'burbs
> to downtown Miami, maybe 25 miles each way.
>
> Yes, the idle was around 1000 RPM.
> Yes, cold starts were tough (35-100F Miami weather)
> Yes, mileage sucked (10-12 MPG)
> Yes, I had to adjust the valves every month.
>
> Yes, it was an absolute blast to drive, expressway
> ramps, squirting through traffic, etc.
>
> If I had it to do again, I would NOT use the heavy
> duty clutch pressure plate. At the end of a year, my
> left leg was larger than the right.
>
> If you go this route, degree the cam for more torque
> rather than top end HP when you install it. (can't
> remember which way, advance or retard by a couple of
> degrees).
>
> Good luck
>
> Carter Shore
>
> --- Terry Thompson <firespiter@yahoo.com> wrote:
> >
> > And the camshaft question is;
> > What are some of your recommendations for a
> > streetable camshaft on an overbored block and higher
> > (9.5:1 to 10:1) compression ratio, ported/polished
> > head w/competition valves? I was planning on going
> > with the comp prep manual of an A-6, but I've been
> > warned against using it on the street (it's starting
> > power range pushed up over a thousand rpms over a
> > stock cam).
> > Paul Tegler's got a good chart of cams, but the
> > variety of "streetable" cams is a bit broad between
> > manufacturers (especially for valve lift). And I'm
> > wondering what some of the real world experience has
> > been on the hotter cams your running.
> > I'm sure a few of you have actually tried multiple
> > cams and sort of have a line on the more affective
> > cams. Paul?
> >
> > -Terry
> > '76 spit 1500
> > Get email at your own domain with Yahoo! Mail.
> > http://personal.mail.yahoo.com/
> Get email at your own domain with Yahoo! Mail.
> http://personal.mail.yahoo.com/
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