Ohio claimer pistons ,crap?

Cr500joe · Posted: Tue Jun 14, 2011 2:49 am Post subject: Ohio claimer pistons ,crap?

I started building a 406 sbc back in 2000 , my boss had a set of new "claimer" pistons he said I could have . I looked on the box and it said 10.0 comp 1/16 ring , 723g with pin- good to 400 hp and 6800 rpm . So I had my friend at our local machine shop bore it .030 and we went through hundreds of 5.7 rods picking out the perfect set , balanced the hole thing and I put it away until my motor blew or I got the rest of the parts I wanted together. Well the motor won't die "I've really been trying the valves just keep floating DAMMIT !!! " but last summer I got a steal on a set of ie 200 72cc head for 500.00 nib and couldn't pass them up . So I got the mating kool can intake -123.00 powder coated never fired e- bay. So now I'm ready to finish it but I'm having secent thoughts about those free pistons what do you gies think?

Big Dave · Posted: Tue Jun 14, 2011 3:42 pm Post subject:

Don't know much about them. Are they Cast, Forged, or are they Hypereutectic pistons? Do they have a floating pin or a pressed pin. What is the compression height? Do the oil rings require a heavier reinforcing piece to jump the gap caused by a pin encroaching into the ring lands?

af2 · Posted: Tue Jun 14, 2011 5:49 pm Post subject:

Measure the pin distance to top and to side to see if they are all over the board as a set I did 4 years ago. I had .020 to .005" difference in pin location. A set of calipers will work for the rough measurement.

Cr500joe · Posted: Tue Jun 14, 2011 6:42 pm Post subject:

They are all .020 in the hole , the ring lands look good with Plenty of aluminum above & below the rings . There are two steel reinforcements in the pin bosses. I will only be spinning it 5500 with my smallish xe 274 h cam . O and they are cast. Part #1266-p this sounds like an old badger number to me. Hmm

af2 · Posted: Tue Jun 14, 2011 9:29 pm Post subject:

Cr500joe · Posted: Wed Jun 15, 2011 12:03 am Post subject:

I've allready bought jegs .023 embossed shim gaskets and figured out my dcr-8.01 . I'm hoping to run 92 oct ethanol free pump gas , my quish at .043 should be ok but what heat rang plug should I start with in my iron eagle heads?

Paul P · Posted: Wed Jun 15, 2011 1:05 pm Post subject:

723grams wow those are some seriously heavy pistons. The rods better be good.

Cr500joe · Posted: Wed Jun 15, 2011 3:15 pm Post subject:

Well I think the pin is around 250 grams, so the piston should be around 500. What does a stock 400 piston weigh

Paul P · Posted: Wed Jun 15, 2011 7:45 pm Post subject:

Not sure but around the same is my bet.

Cr500joe · Posted: Wed Jun 15, 2011 9:08 pm Post subject:

Well I'm running newer powdered metal rods with wave lock bolts . I'm hoping they will be good to 5500

squeeezer · Posted: Wed Jun 15, 2011 11:03 pm Post subject:

yep good fasteners needed
i have heavier pistons in my 355 (trw forged)
pink rods and arp fasteners held up to many 6300 pulls

Paul P · Posted: Thu Jun 16, 2011 3:07 pm Post subject:

My 4.160 bore 400 pistons weigh in with the pin at 641g so I guess 723 is not that far out weight wise.

Definitely go with good rods/rod bolts.

Cr500joe · Posted: Thu Jun 16, 2011 4:56 pm Post subject:

Ya I could shave off 50 grams with a good light weight pin but the pistons were free and so was the balancing I'm also running a 6000 limiter. Hopefully I won't find the weak link Confused

Cr500joe · Posted: Thu Jun 16, 2011 5:00 pm Post subject:

4.160 bore isn't that .035 over ? I've never seen that size.

Paul P · Posted: Thu Jun 16, 2011 5:22 pm Post subject:

Yes it was a custom order piston $$$ but nice.