Builds 1FZ-FE TRD S/C Rebuild

Joined
Oct 23, 2006
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The Last Best Place
I was waiting for someone to observe that. :) My machinist likes to set up the valve adjustment first prior to surfacing the head as he doesn’t want to touch the head after surfacing.
 
Joined
Apr 19, 2015
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1,177
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Ramona, CA
I made a decision to use an OEM style composite gasket for reliability as the purpose of my build is for stock longevity with some mild improvements that should improve low end and overall driveability. MLS gives you the advantage of different compression ratios. Decking the block and head is to have a perfectly flat surface for good sealing. MLS requires a certain type of surfacing to seal. I’ve personally yet to meet anyone that said they ran an aftermarket MLS and went 300k miles on it without a headgasket failure. Locally where I live the MLS failures on engines in general far exceed composite. Blocks with floating bores are especially susceptible. At least the 1fz isn’t. It’s just something I didn’t want to chance on this build. If I was building a race motor with frequent rebuilds I think it would be fun to try.
So far I've got 60K miles on my MLS with no issues or signs of an issue. I was able to compensate in the height loss of the machining operations with the gasket by ordering it to a prescribed thickness. With the length of this aluminum head, I think the shear forces on the gasket exceed what a composite gasket can handle in any kind of overheat situation. I don't intend to intentionally overheat it, but if it does happen, I think the MLS stands a better chance of surviving it, but that's all opinion.

Will take a good many years to get to 300K! Am hoping to get on board with @NLXTACY and run his turbo kit on mine once he has it CARB approval since I live in CA. Once I do that, will put the MLS under additional stress.
 
Joined
Oct 23, 2006
Messages
2,572
Location
The Last Best Place
A little late on this update but, the valve adjusting shims came in and were delivered to the machine shop. In the meantime kids have become very interested in wrenching so I’ve been teaching and guiding the next generation.
3DAAD8B1-A282-4C33-A274-2B944FB20BD5.jpeg
 
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