Can folks please add accurate HG compressed and diameter measurements to this thread.

I have scoured the net for many data points but there is a lot of variance so Id like to start again in this thread to improve the accuracy.

Here is what I have collected:

MFGR_____COMP_____dia

NISMO____0.60mm___???

Ishino___1.00mm___???

Nissan__ 1.14mm___???

Nissan___1.20mm___???

Nissan___1.25mm___???

Felpro___?.??mm___88.9mm

Felpro___1.10mm___???

Felpro___1.15mm___???

Felpro___1.20mm___???

HKS______1.00mm___91.0mm

HKS______2.00mm___91.0mm

Tomei____1.00mm___90.5mm

Tomei____1.20mm___90.5mm

I measured the 88.9mm Felpro on a spare I have. Most state 89mm.

_____________________________________________________________________________________________

Some oval shaped early L24/L26 gaskets are also mentioned but I omitted these as the volume would be difficult to calculate without knowing more details.

FYI:

part number 11044-N4221.

Stamped with the Nissan logo with the code NRZ 46F. NRZ stands for Nippon-Reinz

made in Japan.

oval ring measures 89.5mm x 87mm

features the same water passage holes that original (1971 E31 240z) head gasket had.

You would think the FelPro info would be easy to find but Noooo. Not ever on their website. Just silly...Jegs doesn't have it, Summit racing doesn't have it, Rockauto doesn't have it...

Charles

Can folks please add accurate HG compressed and diameter measurements to this thread.

 

I assume that you want the fire ring thickness.  I have an old 76 HG, that I'm pretty sure is the original.  Don't know if it has any ID numbers on it though.

Yup! The firing ring.