P90 barn find

[siteunseen]

Was $25 too much? 

[Diseazd]

Congrats Site ….. Good luck with the shave and shim! 

[siteunseen]

Watch your inbox. I remember you use the Z valves in the p79 heads. 

 

[Patcon]

That's a super find. Do you have an expected home for it?

[siteunseen]

10 hours ago, Patcon said:

That's a super find. Do you have an expected home for it?

"Home is where the head is"  

I'm going to take it to my job and disassemble it when I can. Bag and tag all the parts then bead blast it. In the meantime I can read up on the mod to figure out what to do next. Hopefully I can use this one instead of the 53 year old E31 I was planning on putting that cam kit on.

Most likely use up all the parts I've collected to make a higher compression motor then drop it in the 280. I'm not touching that 240 unless I have to, fenders already have elbow dents all over the tops.

@Jeff G 78 I found this for less than shipping that P79! $475 less than the ZX motor. 

Does this sound about right @Diseazd?

• - shaving the head .080"
• - installing 1975-78 L28 valves which have .080" longer stems
• - shimming up the cam towers .080"
• - shimming up the spring bases by .080

Edited April 16, 2023 by siteunseen

[Diseazd]

Eiji will have everything you need to build the perfect head.  If you need any help, feel free to PM me. We had him over this weekend for number 50.

Edited April 16, 2023 by Diseazd

[Jeff G 78]

Very cool find Cliff!

Remember that you don't have to do all that valve swapping and tower shimming.  You can go one of two ways and keep the ZX valves.  Either shave a bit less (0.060") and take up the difference by slightly modifying the stock chain guides, or go the full 0.080" shave and buy the Kameari chain tensioner.  I've heard they are rather loud, but it's a cool loud.  With either solution, you don't shim the towers and you dial in the timing with an adjustable cam gear.  This can be done cheap as well.  I started with a high quality timing chain set and then drilled one of the dowel pin holes for a Chevy V8 eccentric bushing setup.  For less than $10, I got a set of eccentric bushings and I was able to dial in my timing.  An adjustable gear is easier, but both accomplish the same thing.  This engine was in my race car and ran great.

[Zed Head]

It has the same chamber volume as a P79 head.  With flat top pistons it will have the same CR as a 280Zx engine, 8.8.  One benefit is the lack of exhaust port liners.

[jonbill]

You can always weld it, then you don't need a big skim.

 

[siteunseen]

14 minutes ago, jonbill said:

You can always weld it, then you don't need a big skim.

 

Trade with you?

That's cool as hell right there.