1969w3155

So, anyone have these in this bore? (4.097). I looked quite awhile back, and none existed, talked to Arias at the time, and he wanted $1200.00 to make a set with rings and wrist pins. Curious as to whether or not any manufacturer has introduced them.

Fun71

Have a look at this post for a new piston choice.
https://classicoldsmobile.com/forums...5-pistons.html

1969w3155

I read that when it was posted, the compression is lower that what I want. I am skeptical of the 10-12 hp gain claimed. I do like that 4.100 is right about where I want to be for the bore, as I don't want to go to .060 over if I don't have to. The lightweight is also a plus.

olds 307 and 403

https://www.summitracing.com/parts/dms-6020x-4100
These will be closer to what you want with a better than stock ring pack.

Fun71

Aye caramba! No one uses silicone in metallurgy, just as no one uses silicon in breast implants.

1969w3155

Thanks for the replies, I'll take a closer look into these, and the silicone info. Best friend is a senior applications eng. for Mahle, knows a few things about pistons and rings.

Fun71

I was being sarcastic about their "silicone" statement.
Silicone is a rubber like polymer and silicon is a hard, brittle crystalline element. Totally different things and you don't want to use the wrong one in either breast implants or pistons.

oldsmobiledave

https://dssracing.cld.bz/DSS-RACING171/36-37#zoom=z


here's a 350 Olds piston for you in a 4.100" (0.043" overbore).


I have no personal experience with this piston but they were discussed on Facebook a few months ago with positive comments.


Dave

1969w3155

I know what silicone is. Shows what I know about pistons & metallurgy & pistons, I figured that your silicon(e) spelling differences was an error. i will have to get the specs. on these, as to height compared to originals, and how far that they sit in the hole. I do wonder, not that it makes a difference, as to what these pistons were originally intended for with a 4.100 bore. Is it just to cover many applications?

1969w3155

Dave, I saw some comments on them on FB. By the way, who is D.S.S.?

oldsmobiledave

Contact information for D.S.S. is at the bottom of the page in the link. They are an IL USA based company. The pistons are made in USA.


http://dssracing.com/ is their home page

olds 307 and 403

I believe the bores which are similar to the Mahl pistons Mark help bring to market is for common ring packs size. The KB 403 pistons used goofy oversizes to work with Ford 460 rings. In this case it may be LS bore sizes since the world revolves around it.