Wonder is anyone using the 2UZ iron block with 1UZ heads or indeed the 1UZ with high boost reliably, say 30PSI +? Sorry if some of this content may be covered already in the forum.
I assuming fully built internals - combo from David, so apart from weight, are there any issues with the it? I am wondering if it is worth the investment & hassle. Or is the limiting factor the 1UZ heads.
Reason for query, for some reason, yet to be resolved, we are having head gasket sealing issues even at only 24psi (800HP region) with the 1UZ alloy block, 7/16" ARP studs torqued to 80lbs, MLS gaskets, surfaces machined flat. I summise that something is giving either block or heads, and Im worried to go 95+lbs torque, fear of block local deformation or thread failure with the alloy block. Reckon we could go with 110Lbs on an iron block like we use on the 2JZ.
I am going to try 1/2" ARP studs from David on another engine but if these don't work then the other dread is that the chambers are lifting, (heads deforming between the studs under high cylinder pressure) if so we have no options, only go back to a 2JZ.
![Frown :( :(](https://cdn.jsdelivr.net/joypixels/assets/8.0/png/unicode/64/1f641.png)
Not sure if I fancy going to metal "O" ring, groove & copper gasket method, becuase if it's an inherent head or block weakness problem this will not help.
Any experience & comments will be much appreciated.