second chance

If you want input from the wider community you might want to start your own thread.

Thanks but I'm not specifically looking for a different cam.... I literally inherited this cam yesterday and was wondering what it was or the application it was ground for. I have no problem calling shops to get what I need but I don't like wasting anyone's time. I figured the forum was a good start, guys have been great on here answering questions as time permits. I know know what I have now, next step is going to be finding someone that can use it.

Thanks, any idea where the best place would be to sell the cam? Looks like I won't be needing it.

So I did a bit more digging, I found a shadbolt 721 stamp on the cam. What application would suit this cam? 721 Profile: (purported to be a copy of Racer-Brown #391-R, pg. 54 of the later Steve Smith book.) 306 degrees duration (45-81-81-45) Overlap: 90 degrees! (yeowch!, that's racy!) Lift: 0.582” at the valve Cam oiling spray bar MUST be used, along with max effort valve springs, and maybe even lightweight spring retainters

I need some advice and insight. I just inherited a cam that was ground by a shop and never installed. The box says 81° 45° 45° 81°. Can anyone help me out, what do these numbers mean? What's the advantage or disadvantage of running a ground cam? W58 head Stock valves L20b with L28 dished pistons (+.020)

Care to share why?

Thank you once again, this is great information!

I also have the option of using an A87 head or a W58 head. What would be my best option between the two? Are there pros and cons to using one or the other?

I am trying to keep it simple and budget friendly. I just wanted to make sure I was understanding the information I collected from all my research correctly. I'm looking forward to getting started on this, it's been too many years since I ventured into engine work.

Thank you.

This is exactly what I was looking for, thank you for answering my questions.

That's a little outside my budget! Nice setup though.

Thanks Stoffregen.

Thank you Danalive, I will check out this calculator.

Alright, let me start by saying I have been reading, searching, and re-reading posts about rebuilding a L20b motor....and I'm overwhelmed. Can someone help simplify the parts required (on a budget) if I need to bore out my cylinders. Correct me if I'm wrong, Boring 40 over will require 86mm pistons? I can keep my Crank (stock L20b) and connecting rods, purchase a set of 86mm pistons and ring set....and I should be good? I think I saw Mike post that 79-80 280zx are dished pistons @86mm and 81-83 280zx are flat top pistons @86mm. What are the advantages/disadvantages of each? What have others done when rebuilding their engines? Can anyone provide a parts list? Please be gentle. Thanks,