Will you be submitting this piston (stock 383) to NHRA for approval ? Time frame ?

Thanks

Thanks Mike. I'll be building a 383 stocker next spring, hope to have another piston to choose from.

Brian

Finally....someone is listening.

I have a 2-71 383 HPs I'd like to put light weight stock compression height pistons in, in the near future. Would like to have a set myself.

I'd love to find some high compression 383 pistons but everyone only makes them in flat tops or dished.

I recently picked up an NOS set of Arias Speedmasters made in the mid 70's. They utilize the std comp ht and the 1.094 pin. This set is unlike the others that I've had it the past as they have a shorter dome (rated@11:1?). The others I had years ago had a much taller dome but I don't recall their 'scr rating' with what head and deck. I can't tell you the true scr rating nor can I tell you the volumne these domes but they are short, maybe 8-9 CCs. They're out there, it just takes some digging and keeping your eyes opened.

BTW, just for reference, I have a set of TRW2315 pistons on-the-shelf, so I measured the ch which is 1.924" on this particular set. The 'official' NHRA compression height spec is 1.900".

As for your question Mike...if they're high quality, utilizing a 6.766 rod and .990 pin, with a 12-15cc dome, yup, I'm interested.

Hey Mike S., I could have used a good set of pistons whan I started collecting parts for my 383. I am building a high revving 383 and had to use KB400 pistons. All machine work has been done. It is ready for assembly now. Finding good aftermarket rods are also a problem. I set my 383 up using the following specs:

My target with the KB pistons and stock rods is 450-500 hp at 6500 rpm.

KB400 +.040 pistons
Reconned stock rods w/ARP wavelocks. (Couldn't find any Eagle 383 rods, the supply of them is quite sporadic)
Steel crank
5/64 moly rings
Clevite bearings
Balanced spinning assembly
Mopar .528 Solid cam for initial start up and engine break in (Muscle Motors has spec'd out a custom Comp cam for me that I will use after I get the car and engine dialed in)
Stealth Heads w/Muscle Motors blueprinting and Stage One porting with 83cc chambers.
Edelbrock RPM intake
Biggs 750 vacuum carb.
MSD ignition

I understand the business need to start out with a stock rod 383 piston. But if you get this off the ground and can expand your line then I personally would like to see a set using the plentiful and inexpensive .990 long rod with floating pins and 1/16 rings. When they are available I will be the first in line.

I hope you can make this happen,
Mike F.

P.S. The car is a 1964 Dart with a Hemi 4 speed, Dana 60 w/4.10 gears.

Mike F you should have no issue reaching your power goal.A peak rpm would be nice about 5800-6200 rpm with the cast piston.

Now an update,the first set have been in the works for a customer's engine and should be here hopefully in a few days.4.310 bore size with 1.920 C.D. w/valve notches.1/16 ring package and stock pin size. Weight saving of about 100 grams over stock piston. This will be the standard piston exc bore size which will be available in +.030,+.040 and +.060.Standard C.D will be 1.930 for -.002 deck @9.980. Depending on cyl hd cc's,a.040 head gasket and bore size this should be a true 9.3 to 9.6 -1 comp ratio.Perfect for pump gas w/iron cyl hds.

Pics and price soon.Thanks for the input!

Here are the pics. 100 gram weight saving.

Specs 383

Bore 4.25 +.030,.040,060
Stroke 3.38
1.930 will be the stock c.d. If you need less no extra cost.
6.7 cc valve notches (Pistons are not L or R with these notches) Big valve version will be L and R at no extra cost.
6.358 rod.
1.094 pin (.990 pin no cost option) Press or float, new style (round) lock rings included.

Price $625.00 plus shipping.

#2

#3

Wow very nice I think the value of 383 blocks just went up

Gus

John,that was for this set.That is the great thing about these.Custom options at no cost.Yes ,right now I am focusing on an iron head 9.5-1 closed chamber set up.There are available wo /notches.I also reread some of the sae papers on quench..040 is the absolute minimum recommended and even .080 is beneficial.Price wise I think it is very fair.Sealed power forged pistons and a notch job would cost more.As far as hyper stuff,I do not use them ,I would rather run the old stock cast stuff.

Thanks for your input,Mike

I think the price is fair

I've run quench tighter but everything has to be right. I shoot for .045 max. I wouldn't bother worrying about if it's going to be .080, you don't need a fancy piston, steel shim gasket and cut the head .040 .

The stock 383 in my dart has the piston about .002 in the hole, heads are 90cc stock, compression is only 9.2 with no quench.

John,I have checked some 906 heads and the recess area is about .090-.100 deep stock.One issue is they are not a machined area as you know and some chambers have a bit of slag in them.Another issue is at the point where the recess meets area of the chamber where the valves are.Some appear to be thinner in that area.As I wrote earlier I would rather use a plus deck height than a quench dome.

9.5-1 can be reached,depending on bore size with a closed chamber cyl hd @80cc's. 5 to 7 cc dome (off the top of my head )would allow 10.5-1.That is a very small dome that I have used before (Ross) 4.280 bore 0 deck@9.968 with 84 cc Eddies and 5 cc dome 10.7-1 .040 quench.

I will continue to investigate all the issues discussed. I may have misspoke as I am pretty sure these are lighter than any Diamonds I have used.The important issue is we now have a platform that can be used to cover several combos without the custom prices.

I'd be for a quench dome version. Some folks are stuck with iron heads due to rules and too much cutting on heads leads to questions better left unanswered, know what I'm saying? S/F....Ken M

a pump gas friendly quench piston would sell. 383-400 guys are starving for a street piston.

Mike
What type of material is the 'race piston' to be mfg'd from? Will there be a particular dome configuration/style, is that being considered, anything similar to these? Flame slot? Shorter CH similar to the above mentioned long rod (6.76) piston? By-all-means, if you're going to produce something similar, I'd like a set myself.

The race pistons will be forged or billet 2618 aluminum alloy.They are nothing like that Arias.That piston from Arias is a real oldie.Same blank in use by Forgetrue and they disappeared in the 70's.Super heavy too. Minimum clearance at least .007-.008