[Healeys] Valve Clearances for an M

i erbs eyera3000 at gmail.com
Thu Aug 22 23:49:34 MDT 2019


Ed Iskedarian cut the cam on my car 45 years ago. He called it a hot street
cam. I lost the info about it years ago.

Ira Erbs
Portland, OR
typos and artifacts are the fault of my phone

On Thu, Aug 22, 2019, 9:56 PM WILLIAM B LAWRENCE <ynotink at msn.com> wrote:

> A high lift cam means that the valves come off the seat earlier and land
> back on the seat later than standard. That limits the valve's dwell time on
> the seat, which is critical to heat transfer from the valve to the seat.
> Greater clearance is the compromise to extend valve life. Isky specifies
> 0.018" for my cam. If you know the source of the cam I would go back to
> them for the spec.
>
> I have the OA6, OA7, and OA8 needles and have tried them all. I found
> that, at least at this altitude (5,000-6,000 feet), the standard OA7s give
> the best results.
>
> Bill Lawrence
> BN1 #554
> ------------------------------
> *From:* Healeys <healeys-bounces at autox.team.net> on behalf of Steven
> Kingsbury via Healeys <healeys at autox.team.net>
> *Sent:* Thursday, August 22, 2019 1:56 AM
> *To:* healeys at autox.team.net <healeys at autox.team.net>
> *Subject:* [Healeys] Valve Clearances for an M
>
> OK folks, I know the setting for valve clearances on a 100 is 0.012, but
> when a hotter cam gets put in to a 100 with larger carbs and different
> pistons, does it stay 0.012? I am going to check all of the clearances on
> the set up as it sits now before I do any adjusting of anything, but
> thought I would run this by everyone before I touch or move anything.
> Thanks in advance.
>    And just as an update, I got the OA6 Rich needles in now, I brought
> both jets up in the carbs evenly and then let them back down 12 flats each,
> so I've now got a base line to work with. I am re-installing the alternator
> conversion that was Mickey Moused into position with the Moss/AH Spares
> kit, which is quite nice nice and then I also just got a Snap On timing
> light so I can set the advance accurately. It's coming along, slowly, but
> that's okay, I'm in no big hurry, I just want it right as I plan on driving
> the wheels off of this car.
>    Thanks again for any information you might pass along!
> Steven Kingsbury
> Hopped Up BN1
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