Hello and Greetings from Mexico.

The other day I came across this on Amazon:

https://www.amazon.com/COMP-Cams-84-123-6-Camshaft-260S/dp/B005H89VY6/ref=sr_1_27?keywords=Comp%2BCams&qid=1672171010&rnid=2941120011&s=automotive&sr=1-27&th=1

And was wondering if it´d be suitable for my project (´72 240Z, automatic and pretyy much stock in most ways), as you probably know here in Mexico brand new aftermarket or OEM cams are extremely hard to find so I´m curious to see if any of you have had experience with this brand/model, can you recommend them in terms of quality, , performance, etc

Thanks in advance

Edited December 27, 20223 yr by julitoMX_1964

I have used a number of CompCams cams and never had an issue.

@Diseazdmight have a better opinion on lift and duration

I’ve never used a Comp Cam, but .420 lift is pretty much a stock camshaft.

Edited December 28, 20223 yr by Diseazd

As Diseazd points out, those numbers aren't extraordinary.  Looks like they extended duration but did not add any lift.  Probably can't tell it from stock.  Should work fine.

https://www.jegs.com/i/COMP-Cams/249/84-123-6/10002/-1

 

Are you looking for more performance or for a replacement?  Don't forget that you'll want a whole new set of rocker arms.  Plus lash pads to fit the cam.  Valve train work can get expensive quickly.  Good luck.

4 hours ago, Zed Head said:

Don't forget that you'll want a whole new set of rocker arms.  Plus lash pads to fit the cam. 

Lash pads.. okay, but a new set of rocker arms too? Why? (If the new camshaft has about the same Lift and duration) i would check them and give them a good polish.. (and check the contact area)..

Oh i noticed something else.. i never looked at those valve timing diagrams very closely.. and.. i discover that there is always a valve open? how can you make compression then? yup.. thought about it and yeah the engine makes 2 complete rounds per cycle! It's because the openings of the valves is drawn on the 360 degrees the crank makes not the cam.. Am i making sense?  So from the 720 degrees (on the crank 2 rounds) the intake is 248 degrees open and so is the exhaust. Plenty of degrees to make some compression! 👍

Like Zed Head says…I would definitely recommend new or remanufactured rockers to break in a new cam. Delta Cams does a great job remanufacturing old rockers. You want a smooth surface to break in that cam. You probably can reuse the lash pads, but I would check the wipe pattern always……just to be sure.

Edited December 28, 20223 yr by Diseazd

@Zed Head well, as I said, I was just looking at options in case I realy need to do something about the car´s cam. I haven´t even disassembled the engine yet but have been buying parts here and there (new water, oil and fuel pumps, timing chain kit , gauge senders, etc as well as a rebuilt 280ZX distributor and a brand new Holley 390 4bbl carb and Arizona Z manifold) My aim is to build a reliable, responsive daily driver (even if it won´t be driven daily) rather than a high performance or racing car. And yes, I´m aware tha it´s not the only thing I´ll have to purchase and that´s also part of why I´m buying parts before taking the big steps.

Cool.  You didn't actually say why you were looking, for the record.  Maybe you were thinking it.  You just said parts were hard to find.  Good luck.

Sorry I wasn´t clear. Still have a lot to learn. Thank you

There are some forum members with large collections of used parts.  If you have a specific need post on the forum and see what happens.  Some of them will ship to Mexico I think.

Also, many people would say to avoid California Datsun.  Part quality is often poor, and returns or refunds are very difficult.

Do you need a oiler cam or is it pre 9/76 that has the spray bar? I've got some "JAPAN" stamped S30 oe cams and I might consider selling.

Heres a chart on original cams...

https://www.atlanticz.ca/zclub/techtips/cam/index.htm