Input on power gains by swapping head.

[gundee]

1 hour ago, moelk said:

I see two different sizes here, anyone like to explain why? https://www.rhdjapan.com/search/engine/nissan_fairlady-z_hs30-l24-10-1971-01-1974/model/nissan_fairlady-z/car/nissan/category/cylinder-head-and-valvetrain_valv

I don't know why but one set has 50mm intake and 52mm exhaust. The other set has 50mm intake and 59mm exhaust.

In addition they do not look like they include the retainer clips. 

When the machinist did mine he knew from previous Datsun work that I need to get him new clips as well.

I got a brass set off eBay that included the retainer clips. He installed them with no problems.

[Jason240z]

9 hours ago, moelk said:

Will go with these valves https://www.rhdjapan.com/kameari-l-type-lightweight-big-valves-set-in-45-ex-36-5-118-l6.html

What about valve guides?

I see two different sizes here, anyone like to explain why? https://www.rhdjapan.com/search/engine/nissan_fairlady-z_hs30-l24-10-1971-01-1974/model/nissan_fairlady-z/car/nissan/category/cylinder-head-and-valvetrain_valve-guides

 

Email Mr Mori Direct at Kameari.  He'll help guide you to what you need.

[240260280]

You need a guide guide!

[Jason240z]

how did you get on?  whats the 0.50 duration of that cam?

[moelk]

2 hours ago, Jason240z said:

how did you get on?  whats the 0.50 duration of that cam?

243 is the 0.50 duration.

I have sadly got some other things to put my money on at the moment so the build of this head will probably have to wait a while. 

Head is now at the shop for cleaning/checking so it’s good to go (hopefully) when i have collected all parts i need, valves, seats, guides, adjustable cam gear etc.

[Jason240z]

11 hours ago, moelk said:

243 is the 0.50 duration.

I have sadly got some other things to put my money on at the moment so the build of this head will probably have to wait a while. 

Head is now at the shop for cleaning/checking so it’s good to go (hopefully) when i have collected all parts i need, valves, seats, guides, adjustable cam gear etc.

about 285 max(from 0)?

[moelk]

23 minutes ago, Jason240z said:

about 285 max(from 0)?

Yes, 290 is what is supposed to be