Where does one find Speed Pro L2321F pistons? I can't seem to find them.

I am aiming for 9.0:1 - 9.5:1 CR for my '72 350.

Thx

 

Is this what I need?

http://www.summitracing.com/parts/SLP-L2321F30/

These are .30 over though correct?

 

Yes and yes. Same piston I have in mine.

 

No std bore ones?

Does going from std. to .30 make a big diff HP, torque, etc. wise? I have only ever needed it honed, so have no idea.

Also, what about rods/pins? Is it worth it to get good aftermarket ones, or just stick with replacements?

 

Wonder if it would be better to get the std bore 2320 flat tops and put a bigger head gasket on instead... http://www.summitracing.com/parts/SLP-WL2320F/

 

I think maybe it would be wise to sit and think about what your actual goals are.
If you're wanting to stay with a std piston and it's only available in the 2320 then I guess you have no choice.
Boring the block only adds hp/tq if the bores were in poor shape to begin with. If you're concerned about boring in general, then maybe the CP pistons that BTR has would work. They are .013 over but a bit expensive.
Or if the bores are good, you could always offset grind the crank then use a 6.00" SBC rod and .060 over SBC 350 Piston if you like. They'll be cheaper, lighter, and stronger than the stock stuff no doubt.

Bottom line if you had to bore it .030 to use the 2321 piston I wouldn't lose any sleep over it. The cylinder walls on most early SBO will take multiple oversizes with no issue.

Good luck on your build.
Mark

 

I already know my goal... to rebuild my engine. I want a roller cam (prob going custom Comp), and 9-9.5:1 CR, and 'factory stock' otherwise (other than perhaps roller rockers).

It is just that when it comes to pistons, I have no clue if I should stay std size unless absolutely needed, or if does not matter at all. I am also wondering if stock used (or new) cast pistons/rods from a '70 350 4bbl would be worth while, then play with gasket height, etc. This is prob where my machine shop comes in. I will check with them.

BTW, if I do end up getting a custom Comp roller cam... will Erson roller lifters work fine with it? After reading some, I need the 'retro' style lifters... but Comp Cams are $500.00 which is pricey.

 

Yes the Erson roller lifters will work. Is the reason for the Comp the firing order?

 

Yesem. Plus, it is within driving distance. Well sorta.

 

Just my opinon, but the foundation of any good build is eight round holes (nine if you count the crank bore). After 40 years the bores get taper, etc. Boring is usually only $120 extra if you are planning on new pistons (plus pressing on the rods). Money well spent, cheaper usually isn't better. At our shop we charge $600 for a race prep, .030 bore, hone, hot tank, cam bearings and freeze plugs (plus parts) align bore and a .015 deck clean up. Do it right, do it once, JMHO.

 

Thanks for the info.

capt... I recall your specs on ROP that you used cast replacement pistons? I am curious which way most ppl go to increase CR... new lower dish (or flat top) pistons, or milling the heads n related using the the stock type pistons.

 

Huh? Comp is in the south.

 

I am getting it through BTR.