5m-ge future engine mods?

[Mk2guy]

Originally Posted by mechrider89

does a re manufactured head come with all new components? as it sits right now I may end up just buying a valve spring compressor and pulling the valves myself. Then going to polish the valves and domes, port the intake and exhaust runners, so hopefully when I get the pacesetter header it'll be about the same diameter so I get a good flow.

As for miles well my supra has 263k kilometers which is like 165k miles, I've heard of these 5m's getting well into the 300k miles with proper maintenance before calling it quits.

Yes, that is exactly right. If you end up pulling the valves out yourself make sure you know where each valve goes. As they are worn to fit in each hole that they are in. Same with the lifters and rocker arms.

Sometimes when you rebuild a head the engine may smoke because the extra pressure on the rings, but I doubt this will happen, as long as you have changed your oil semi-often (every 7,000 miles or so)

What you have planned may only get small horse power increases. You should look for a junk head and practice polishing. Get the car running for the least amount possible for now and plan for a rebuild in in 65,000 miles. You can get the necessary machine work for the $348 or so I said earlier.

It's acturally really hard to properly port and polish a head. You need a flow bench. Your best bet is to plan a 1jz transplant if you want more power. I am going to throw some money away when I do my 5mge overbore. I will have the heads professionally done ($2000 by a racing outfit) and then bore and hone for the over size. The cost is about as much as to do the transplant, but I will only get 240hp (about the same as a Ferrari 308 of the same period.) The Jz1 will get much more. (not sure on specifics, but it's hundreds more)

You should really keep your car stock and running. Buying new shocks and struts is the best investment on my car. As the 85 supra is an awesome drift car. (I was impressed with my car after the new shocks and struts.) Your car is a fun car just driving it. Take care of it and keep the interior and exterior in the best shape possible to keep it's value. Value is the most important thing with this vintage.