Stroking a 302

[Jim Pearson]

Hi All,

My 302 is in pieces following a damaged piston and one of my rebuild options is to have it stroked.

From the postings on the subject a couple of years ago, it appeared that the pro stroking concensus was to limit the capacity to around 330ci to avoid wrist pin/piston ring interference, although some of you preferred other methods of enhancing streetable power.

I would appreciate any updated information or advice you may have.

Many thanks,

Jim

 

[Ron Earp]

That old myth of wrist pin in the oil ring above a certain displancement needs to get killed. Some stroker kits do that, others do not.You should be able to find a bunch of info on engines by searching around here on the forum.

 

[Neal]

Ditto. I've built three 347 engines over the years, all with pins intersecting the oil ring lands. No blow by or consumption problems. One has over 20,000 miles on it. Probe Industries makes pistons that do not have this issue.
http://www.probeindustries.com/Pistons/Pistons_SRS/Ford/302/Ford_347_ft.htm

These pistons are made by Aries. As you can see the oil control ring crosses the pin. When you put the ring together you use a backer ring bellow it.

Either way you can't beat the stroker for HP and torque.

 

[Kevin M]

JimP,

Coast High Performance http://www.coasthigh.com/ and Eagle http://www.eaglerod.com/ both make 347 strokers that do not have the pin intruding on the oil ring land. The "secret" is that instead of using a 5.400" Chevy rod, they make a special 5.315" Rod. They are selling them in enough quantity that the price is basically the same.

The engines work fine and have no problems related to oil control rings.

Kevin

 

[Jim Pearson]

Ron, Neal, Kevin,

Many thanks for your fast and encouraging responses.

Web links especially helpful to us V8 deprived souls on this side of the water.

Thanks again,

Jim