zwk2433

Y'all:

I am installing new heads and cam on my 91 5.0 gt w/ 120k miles. I had a mechanic tell me today that if I didn't get a new bottom half to go along with it that it was a waste of money.

Is this true?

Zack

stangman94

uhhh no he is just trying to suck money out of you.

capri debris

Well, it depends. Most main bearings and rings are only good till somewhere between 150,000 to 200,000 miles determined by how regularly the oil is changed and how hard the engine is run over it's lifetime. So "waste of money" is a phrase that is relative to what YOUR engine condition is. You may do what you're suggesting only to have to tear it back apart soon after to replace the bottom end stuff... or it could last a long time with no problems.I, being a person to leave nothing to chance, would rebuild the whole engine, but many have done a "half" build with success. This is your choice and many will have different opinions... good luck.

WhiteWindsor

If your car is running good now and your paying for labor, in my opinion i would just put on the heads and cam and not worry about the rest for now. Heads and cam can be installed while engine still in car, if they pull it, labor will be crazy. Now if your doing it yourself then i would definitaly build the bottom end also. Like stated above these engines can last a very long time and some not so long. I had a 91 with over 225k on stock engine and it ran great, did not even smoke. After you pay for labor to completely rebuild one you can just about purchase a built engine already, but then if you don't have the know how you would still have to pay to install.

stang8689

My car ran great and i kept the bottomend stock, they are build well from the factory

Rajun_Cajun

I've got a stock bottom end with 150,000 miles and it still runs strong. Do a compression check on yours and go from there... Check out my setup in my sig. I race every weekend at my local track too.

ryan_89_mustang

Giver **** these motors go forever, mine seems to be running good with over 300,000kms on it, And I expect er to go for another 50-75k atleast

ih8chevy

hey ryan, is that your 69 torino in your avatar thingy?