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RA is a roughness average. Basically how smooth the gasket surface is. The machine work and smooth RA is required when switching to a Metal Head Gasket, they are much less tolerant to imperfections in surfaces.

Kitty says NO! lol

+3 Where's my popcorn smiley?

That's why I BHG'd and what that blower thing is for? Darned.

The screw mod allows more air past the AFM, which allows more boost before fuel cut. 1 or 2 more psi will add more power. Taking out the air filter? That's just unsafe. The filter is one of the least restrictive components in the stock intake system anyway.

Double posting is +20hp I hear.

What year? pretty sure mine says 89+ All I can find online is euro octane ratings, and my manuals all the way out in the garage haha.

I know how you feel, the track by me is 1-1.5 hours away.

Not necessarily, Owners manual calls for 89... There is shimming the wastegate, and the AFM screw mod. Open downpipe is always fun too.

It was funny for about 2 seconds... then just got annoying

The way you explained it, it sounded like your car was barely able to pull away from a redlight. Haha 14.6 isn't bad considering the problems, fix those, and definetly work on that 60' and you'll see a huge gain. My guess was slightly based on the only time I took my car to the track. I...

Basic english and typing skills is obviously over-rated these days JAV:3d_frown: Is that metric or standard?

Depends where he is losing compression. Most likely the headgasket, or rings. Could also be from the valves, or worst scenario the cylinder walls. This could all probably be fixed in a rebuild.

You said your head was warped. But you sound like you don't know the difference between warped and decked, or milled. This is how you check for warpage. Do it, or throw time and money into a useless head. flight, cams will turn fine after milling, given the head is not warped. If the head is...

17.8-18.3 is my guess, at around 88mph.

Dude, listen to jdub, and everyone else that has given you advice. Did the machine shop tell you the head was WARPED more than they liked, or decked/planed more than they'd like? If the head is warped, it's JUNK. The gasket thickness is completely irrelevant. No matter what size gasket you...

Ohh that helps. Haha good deal.

A shim for the head? Sounds like they want to deck the head to flat, and put a thicker HG in. This is a bad idea. You need a new head. Buy a rebuilt head but make sure it's straight, and not decked too much. Using a stock gasket or MHG?

That's a damn good price. I'd expect to pay that just for the HG and Valve stem seal's to be done.

Or gas, or insurance. You don't plan on driving this Supra do you?