Block Milling

[gsEnterpries]

I wanted to know if milling my stock 2.8l LO block .027" was a good idea.
Reasoning behind this, raise the compression a little more. The piston deck clearance is .047", after milling, it will be .020". Would this cause any problems. If not can I also mill .010" off my heads with out any problems or is this just a stupid idea to do to the heads.
If anybody has done it or has any info would be great.
Thanks

-Gary

[robertisaar]

i believe that the biggest problem this will cause is that the valetrain geometry will be.........off?

[gsEnterpries]

The whole idea itself or the just the heads?

-Gary

[robertisaar]

The whole idea itself or the just the heads?

-Gary

don't quote me on this but if you mill the block or heads, its essentially making your pushrods longer as well, meaning you'll need new, custom-length pushrods. it might bolt together and run but it wont be "ideal".

theres other members here who know a lot more than me about the subject but that should help a little.

[gsEnterpries]

Thank you. The pushrods, those I forgot about, I have built way to many jap motors in my life and they don't have pushrods, so what you said makes perfect sense.

-Gary

[geoffinbc]

Your easier route is to get HO pistons which will solve your compression problem. Milling the deck that amount may be a little much. I got about 0.014 milled off mine. Milling is not that critical to the valvetrain since it is adjustable on the older motors. As long as you keep it within reason

[gsEnterpries]

Where do I get HO pistons every where I look I can't find any.

-Gary

[robertisaar]

Where do I get HO pistons every where I look I can't find any.

-Gary

i'm gonna take a stab at it and say............. fiero pistons??? i know they had a better cam than any other 2.8, maybe the same is true for pistons?

[gsEnterpries]

so your telling me find out what car had a HO 2.8l and buy pistons for that. If that is the case that would explain why I could not find any in the aftermarket. Thanks again.
-Gary

[geoffinbc]

If you just order from any EFI 2.8L with iron heads it will have the 8.9:1 compression pistons. So say a 1993 S-10

[gsEnterpries]

sweet deal
-Gary