Do you recomend these cams (Comp Cam)?

[julitoMX_1964]

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, 2022 by julitoMX_1964

[Patcon]

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

@Diseazdmight have a better opinion on lift and duration

[Diseazd]

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

Edited December 28, 2022 by Diseazd

[Zed Head]

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

 

[Zed Head]

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.

[dutchzcarguy]

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! 👍

[Diseazd]

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, 2022 by Diseazd

[julitoMX_1964]

@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.

[Zed Head]

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.

[julitoMX_1964]

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

[Zed Head]

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.

[siteunseen]

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