300 mm and look how much space to the shock tower...

6 minutes ago, Patcon said:

300 mm and look how much space to the shock tower...

Yep. About 2+ inches. Plenty of room for a cold air box. Maybe someday.....................

I have added a heat shield between the header and intake. (Older picture)

On 9/24/2021 at 6:32 PM, Patcon said:

@Mike

Could a page be made to house some of these really helpful links?

Tire calculators

Engine calculators

Zcar registries

Atlantic z car links

Etc

You mean like a links directory we already have?   Here's a link:  https://www.classiczcars.com/links/

5 hours ago, Mike said:

You mean like a links directory we already have?   Here's a link:  https://www.classiczcars.com/links/

Yes, exactly! 😎

4 hours ago, Patcon said:

Yes, exactly! 😎

🙂  Feel free to add all the tools in that category I created last night.  Let me know if you have any other suggestions for it.  Thanks @Patcon

Mike

 

To the original poster (OP), I offer my opinion.  I only have experience with Mikuni 44's... so stating that up front.  David Weber of Malvern Racing (long dead, but was a friend of mine when I was a young kid) told me that Mikuni 44's are the best carb for Datsuns.  He didn't care for any Webber variant and the 40's were no good either in his opinion.  I was 18, and running a 2.3L stroker motor in my 510.  Know that there are many variables in engine building and you can get lost in them.  That said, don't.  

Rebuild the 44's you have.  Match the intake side ports of the manifold to the carbs outlet if you wish, or don't.  Not an issue for a street car.  Taper from intake inlet to head side should be gradual, but for a street car, again, it doesn't really matter.  Do source RUBBER carb isolators.  Dave said the others are trash, and Mikuni's won't operate properly if the fuel is bouncing around inside the carbs.

Mikuni's can be tuned for street without issue.  I was running 40mm chokes on the 510, and it was totally streetable with a 490/290 cam.  It was my car in college.  Lotsa fun.  

Separately, I have run 44's on my 240z as well.  2.933L technically because sonic bore testing wouldn't allow me to go past 88.5 on the bore.  Narly cam, still totally streetable.  Lots of fun.  The crazy loud wine is a Kameari chain tensioner which I may have had a bit tight.
 

 

2 hours ago, inline6 said:

 David Weber of Malvern Racing (long dead, but was a friend of mine when I was a young kid)

I've read on the internet that David was messing around with custom roller rockers for the L-series engines.  I also read on the internet there were some reliability issues.

Do you know anything about the stories?

PS - And apologies to the OP for the distraction.

2 hours ago, Captain Obvious said:

I've read on the internet that David was messing around with custom roller rockers for the L-series engines.  I also read on the internet there were some reliability issues.

Do you know anything about the stories?

PS - And apologies to the OP for the distraction.

I don't recall ever talking about those or seeing them with either David, or Tom Howen, his friend and driver.  Tom was the car builder, engine builder, etc.  Dave sold Datsun Competition Parts and Cosworth pistons and other brands of racing parts.  He possessed all of the knowledge from their efforts, and he provided the financial backing for their direct racing efforts.  I believe there were some reliability issues with the roller rockers, and I also remember hearing that weight was a problem, but I don't recall if I got that info from either Dave or Tom directly.  I worked in Tom's Shop for the summer of 89.  It was neat to see a lot of the work being done and learn some from the depths of knowledge they had acquired.

Edited November 12, 20213 yr by inline6