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At the expense of sounding like an idiot, I don't understand the "55/88" terminology. I'm used to getting a degrees duration say 270, and then a lift of say 19mm, the above probably translates to the same thing, but I don't know how...

Yeah, I have always seen cam spec advertised like 324'/.620 (Those were the specs for a small block mopar drag cam)

Quote:This is how cams were described in the 'good Ole days' & it represents the nominal cam event.

By way of example, take this once popular spec of 30/70, sometimes called a 30/70-70/30.

Inlet opens 30 degrees BTDC & closes 70 degrees ABDC.
The exhaust was just the reverse, IE, exhaust opens 70 degrees BBDC & closes 30 degrees ATDC

You can figure out duration & overlap quite easily from this.
Duration in this case would be 280 degrees
Overlap would be 60 degrees.

Keep in mind that these would be 'nominal' figures, most likely measured at the cam with zero lift, while a more usable set of numbers would be taken at .050" lift.

In more modern times it is possible to see cams with the intake slightly advanced or retarded from the exhaust specs, but with the same duration, & sometimes even with different duration & even lift specs, so more comprehensive figures are needed, but back in the day, the cam grinder just reversed the inlet spec for the exhaust & a two number system was regarded as adequate description.
Some old habits die hard.

Incidentally, a lift of 19mm [3/4"- or .750"] at the cam is bloody impressive.

Like the cam, i just received my 702A cam from jeff today.

What is that starter motor for it dosn't look like my A series one?

the starter is from a automatic transmition.

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This is the same Wade grind I use

Lemonhead - no the old cam is fine just trying something bigger, where can i get one of those starter from. I am running 13:1 compression and starting is sometimes a problem.

Benny yes the Wade cam is the same, how do you find it.?

hope this one is the goods
you have to love changing cams in these engines hey lemonhead

Hi Lemonhead, how did this starter work out? Did you have to notch the right-side engine mount to install it.

I think this is the A14 forklift starter.

kululadotgroen - Its a 262 duration (@050) with .443 valve lift, and no you don't sound like an idiot .

rally1200 - are you opting for a bigger cam or have you worn one out. The starter is for an a series, its a high torque unit.

qik1000 - Jeff charged me $185 for the reground cam and a refaced set of followers.

Hi Lemonhead,
what does Jeff charge for one of these cams? Is it new or regrind? Whats the lift?
Daniel.