340 piston options

[Juan Veldez]

Boring my 340 block .30 over. I have a stock forged crank (being turned .10), forged stock connecting rods, full floating wrist pins, and Edelbrock RPM Performer aluminum heads. I'm going with a roller cam & lifters, and roller rockers this time. I will not be racing this car and do not plan to spin it beyond 6,000 unless by accident. I still want an honest 10.5 compression. Any piston manufacturer you would recommend, or any to stay away from? Should I consider anything other than "forged"? Also, any type of piston rings - same question. Thanks in advance.

 

[Xcudame]

Jaun, if the crankshaft hasn't been ground yet, ask for an "index grind"! It ensures all throughs are 90° apart. Mopars were pretty good for this from the factory. Chevy and Ford, not do much!

If you're not going to race it, Keith Black hypereutectic pistons are an option and cheaper. Any forged pistons are good. SpeedPro, Diamond, Wiseco and Ross are all great pistons.

 

[Juan Veldez]

Jaun, if the crankshaft hasn't been ground yet, ask for an "index grind"! It ensures all throughs are 90° apart. Mopars were pretty good for this from the factory. Chevy and Ford, not do much!

If you're not going to race it, Keith Black hypereutectic pistons are an option and cheaper. Any forged pistons are good. SpeedPro, Diamond, Wiseco and Ross are all great pistons.

I went with the Keith Black pistons from Summit. They will be here Friday. Sweet! Thanks - John.

 

[moparleo]

Juan, since you insist on 10.5:1 cr, you will also need to find a steady supply of a good quality, 91 Plus octane fuel to keep the pistons happy. No alcohol is a big plus.

 

[Juan Veldez]

Juan, since you insist on 10.5:1 cr, you will also need to find a steady supply of a good quality, 91 Plus octane fuel to keep the pistons happy. No alcohol is a big plus.

That was an unknown plus after leaving California for Idaho. Ethanol free 91 octane gas is readily available here. And in reality, I'll probably be closer to 10:1 after running the numbers.

 

[Xcudame]

Heck with aluminum heads, you might get away with mid-grade 89 octane!

 

[Juan Veldez]

Heck with aluminum heads, you might get away with mid-grade 89 octane!

I hear ya. Chevron (I use loyalty points) has by default 91 octane "blue" fuel that is running about $2.55 per gallon here. As little as I plan driving it, really not a hugh cost savings. No biggie. Pistons and rings show up today - Life is good!

 

[Xcudame]

Chevron is my go to fuel stop! And like you, I have their Visa Card, so you actually see the price savings at some stations! Anywhere from a few cents to 25¢ a gallon!