I just got my 70 Nova with a freshly rebuilt 350 from a 1969 car. The engine has been broken in, it has about 500 miles on it and I was planning on changing the oil soon. I would like to go to synth in this car.

Is it still too soon after the rebuild to go to synth?

Is it wise to go to synth on such an old block?

Thanks
Jason

 

Irun synthetic top to bottom in my cars, I ran it in my 327 also, no problems anywhere.

 

You can run synthetic oils on a new motor, as long as you break it in initally with natural oil. About 100 miles on natural oil should be good for inital ring seating, so you should be ok with 500.

 

on a new engine i run it with 30w dino for 30 minutes then change to 30w dino again and change at 500 miles. if it's a roller cam i go to M1, if a flat cam 30w dino again untill the regular oil change interval, 3000 miles, after that M1.

 

What does the age of the block have to do with the oil that goes in it?

 

five7 running synthetic in an old block has something to do with carbon dating the iron i nthe block and the ice age when the crude oil was forming

 

Ah, that explains it.

Is that like, can't put radial tires on cars made before there were radial tires?

Sure wish I knew more about this stuff, like you... :hail:

 

What about 'vettes coming from the factory with synthetic oil?

 

yup she is fine for synthetic ....actually you didnt have to wait that many miles

 

What about 'vettes coming from the factory with synthetic oil?

 

They've been doing it for several years.

I've been hearing since the mid-80's that it's okay to put synthetic into new cars as soon as you get them home - factory controls were such that it posed no problems.

"Conventional" wisdom says to use petroleum-based oil in hand-build rebuilds for a few hundred miles. Interestingly, GM crate motor instructions says to go through a break-in routine (no mention of when it's okay to go to synthetic - not part of their focus, I guess).

 

The one and only thing that you DO NOT want to break in with synthetic oil, is a flat-tappet cam. It has nothing to do with the rings. Once the cam and lifters have worn to each other, an dthe lifters have all been forced to rotate for a while, you can change.

500 miles is plenty.

I use synthetic from the first in all my roller-cam motors, just like the factory does.