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Mik: There's quite a few sizes available but.... and you knew there was a but, once you go to 2nd undersize you're under the Toyota surface hardness and cranks seem to fail quickly. This is why I went to the expense and frustration of having mine Niterided and re heat treated.

I'll have a go ;) I think what Nash means is you'd end up with thicker bearings but it doesn't work that way. They take a cut off the mating face of the caps to close up the diameter first then line bore till they just touch the block so most of the material comes out of the cap. You...

There are a couple of lever points around the head where there's a 3mm gap to get a screwdriver in with out being anywhere near the sealing surface.

The stock type gaskets have a pressed steel fire ring and this is the biggest size the header ID can be unless you go custom on the gasket.

CNew: Best I can find is an obscure mention that the 256's were one grind in a 3 stage series.

Damn that's so cheap! GT series Turbine housings run 1/4 the price of the Turbo ... :(

Jake: If the tunnels were out you'd have seen evidence in the Main bearings when you pulled it down. Our blocks seem quite stable for a thinwall I-6.

More concern in the fact the trans is 220mm wide back at the extension housing and the Supra tunnel is 210mm at the same point... :( Not to mention sorting out a mechanical speedo drive as there are only a few non OEM 56's that come with one the rest are Hall Sensor.

Steve: Custom Header Gasket?

Put the Synthetic I mentioned above and right away was surprised at how much mechanical noise it reduced, pressures are up 5>10 psi.

LMAO that horse must be getting tired of the beatings ;)! (you'd think codes would be the very first thing checked I always assume people have checked DOH!)

If they're done on stock base circle you could measure the lift by comparing them to a stock set, I'd say HKS would have used a unique lift for each duration if they made more than 1 spec.

Dunno CN sorry... Ask DrJ he might be able to tell you for sure. It would be a bit strange if that's the only profile they made as it seems a lot of work to produce blanks for a single profile.

CNew: About the only way would be to mock up a motor grab a degree wheel and dial indicator and plot em (bitch of a job on a 7M due to the head design) If you had a race shop nearby they might have a test jig set up and could plot em in minutes.

Justin's Bud:I think what Allan is hinting at is maybe the motor was breathing heavy for it to puke oil past the CPS Seal so might have Fouled all of the plugs. (lots of blowby will make it through the PCV system and into the intake tract) Pop em out and have a look.

JJ: You're most welcome as always! :) Dirgle: LMAO I have 3 of em......... ;)

MrNick: That's one of my "junk blocks" NOT the new one ;)!

JJ: just went out and took a pic. All pressure ports in red.

JJ: If it's the one below the Filter Boss It's Pressure, it's where the Aussie NA's are plumbed for the Oil Cooler. There should be 3 x 1/8th BSP ports along the gallery. 1 at the front the the Pwr Steer pump 1 a bit further back for the Pressure Sender 1 in the middle near the...

"Should" be BSP if it's an original hole.