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I recently installed an HKS stopper type head gasket. I have a couple questions: 1. Should I avoid boost for now and how long? 2. How many heat cycles should I run before checking the head stud torque, and how long should I wait between cycles? I read that you should check them after 5...

The block was machined when I did my first rebuild, but the head wasn't. The HG barely made 1000 miles. Lessons learned, I checked everything this time and went with a quality gasket. -AM3

For anyone that remembers my thread over the summer, I learned the hard way how to properly rebuild a 7M. With less than a couple thousand miles on my rebuild, I blew a headgasket. Here is the thread for those of you that missed it. After getting the head back from the machine shop and almost...

That Supra wants to bleed profusely. -AM3

Its not that bad, I had the head removed and taken apart in a weekend, and that was just with spare time. Total time so far is maybe 6 or 7 hours. -AM3

Long story short, you are setting up for disaster and a waste of money. Take the time to save up your money and get your head machined. You will be kicking yourself when the head gasket blows. Adding a Lexus MAF without 550's and a way to monitor your AFRs is asking for melted pistons. Don't...

Have you tried turning the manual knob so that are both completely closed at the same time? -AM3

My local Napa had a nice block test kit for about $45. Worked great. -AM3

Looked at it with disappointment before taking the head to the machine shop. -AM3

Speaking from experience, my engine passed every test except for a block test when hot. I tore it down today and it had a very blown head gasket on cylinder 6, with 1, 2, and 5 on the way. After 5 years of owning a Supra, I've joined the BHG club. So my advice, don't waste your time on a...

I would definitely move forward with the leak down test before making any assumptions. In any case though, at a minimum you are looking at all the labor to change the head gasket or more depending on what it turns out to be. -AM3

I used a generic kit. BHG with only a couple thousand miles. -AM3

What is your current AFM? Also, what are you using to monitor your AFR? -AM3

That's my main concern, but I'm pretty sure its one of two reasons. 1. When I bought the car, it has a motor that had a hole in the block, but had been rebuilt right before it blew up. I bought a long block on Ebay and rebuilt it including having the deck milled, but because of the recent...

Update: Block test confirmed BHG. Good news is I caught it early enough that the oil wasn't contaminated, so I should be able to get away with just replacing the HG. thanks for the help. -AM3

Make a boost leak tester. -AM3

Did you check for boost leaks yet? Also, what are you tuning and monitoring your AFRs with? Are you tuning to VF? -AM3

Did you check for intake leaks?! -AM3

IJ: Yeah, your post was actually the reason I said "Oh crap!" and did a compression test about a year ago. Now that I think of it, it was 2 years ago. Suprapowaz: I don't believe it wasn't overfilled, but it pushed out enough coolant that once it cooled back down, the overflow tank was empty...

IJ: It was torqued to spec when I rebuilt it, but it wasn't in place when they machined the cylinders. Oversight on my part. Everyone else: Block test will be the next thing I do. But I'm still curious if there could be another cause besides BHG, although that is still what I consider the most...