Mike Phillips

My Z starts really hard when it's cold with a strong emphasis on the words very hard. Contemplating a sure remedy, I'm considering all the options including having these rebuilt or replaced with a better system including different Z carbs or a Demon carb on a 4-barrel intake.

Here's a few pics...






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Couldn't see any words on them from simply looking at them.

hoov100

look like standard SU round top carbs to me..

NismoPick

Yep... regular SU Hitachi's.

DAT280SUN

i had a Hitachi on my Datsun 620 pickup and it was the same way really hard to start and when it was cold very rough, idling just was NASTY. bought a 45 DCOE 2 barrel side draft weber. unbelievably better with the upgrade. A ittle pricey but well worth the upgrade to a Weber. Would do it again in a heart beat.

hoov100

its what usually happens when carbs need to be rebuilt..

Mike Phillips

Any known GREAT car rebuilders for this carb system in the SoCal area?

hoov100

their was a place online that specializes in these carbs, just cant remember...

z-therapy?

Mike Phillips

I'm not bad with a wrench, has anyone rebuilt these types of carbs on their own and can share their experience?

I have never had any luck rebuilding a Holly carb, at least they didn't seem to be any better after I rebuilt it, I also found it somewhat complicated if I remember correctly, at least the assemble side.

DAT280SUN

I bought a rebuild kit for my Hitachi before i bought the Weber. They come with pretty detailed instructions. So i went through the process twice and when i was through it whistled really loud under acceleration im 99% sure i put it back together right and still didnt fix my idling problem. Thats what pushed me to buy the Weber.