383 build questions??

[SHARP68]

Going to be talking to my machinist next week & get this figured out..hopefully I can trade up the stock pistons & get what I need then go from there as far as machine work.  Thank you all again for the awesome input I have received I am learning a lot along the way

[willard]

Probably nobody wants these LoPo 366NP pistons... I have 8 such door stops
When changing pistons double check the bores!!! I went from 366NP (0.030 over) to KB400 also 30 over and get blowby and oil consumption and power down... I hade to ONCE AGAIN dissassembly the block, bore to 0.040 and buy ANOTHER set of KB400, now 0.040 over...

If you want 8 ea 0.030 over KB400 with 500 miles on them, I have them in my garage. But I'm in Poland so shipping's not cheap 

[JB400]

My advice is to let the machine shop advise you on ordering your pistons.  Drop off your block, then order your pistons.

[randy73]

My advice is to let the machine shop advise you on ordering your pistons.  Drop off your block, then order your pistons.

+1

Seen many many people bitch all the time about buying a piston, cam,etc.. somebody recommended and then find out it did not work for their setup.

[SHARP68]

The machine shop is going to be able to trade up the unused stock pistons for what I need..I should be where I need to be now & back on track for my build..

[firefighter3931]

Look at Mancini for a set of Diamond forged pistons....about $200 more than a SpeedPro slug but it will be lighter and should have a better compression height. I recommended these to TuffCat for his 383 build 

http://chucker54.stores.yahoo.net/manciniracing6.html



Ron

[willard]

I'm afraid with open chamber heads or stealths theor pistons gonna suck as they advertise tje CR using 72cc chambers:

"Compression based on 72cc cylinder heads, Contact Mancini Racing for additional information."

so custom height is needed anyway.

[firefighter3931]

I'm afraid with open chamber heads or stealths theor pistons gonna suck as they advertise tje CR using 72cc chambers:

"Compression based on 72cc cylinder heads, Contact Mancini Racing for additional information."

so custom height is needed anyway.

Any flat top piston with a 383 is not going to be ideal. Even a zero deck flat top with valve reliefs will yield low static numbers unless you reduce the chamber volume on the cylinder head. 

You could ask Diamond to build a small dome into the 383 piston to increse the static compression. Diamond does make such a piston for the 440....it's advertised as a race piston for the Edelbrock RPM....comp is 13:1 

By my calculations ; using an 84cc chamber, zero deck piston, .040 head gasket you would need a 10cc Dome to achieve 10.5:1 static compression.


Ron

[BSB67]

The machine shop is going to be able to trade up the unused stock pistons for what I need..I should be where I need to be now & back on track for my build..

Be specific.  What are they going to trade-up to?  Again, there is no good choice.  Some are just worse than others.

[SHARP68]

I am in the process of working with the machine shop to correct this..they are being cool so far as long as it had been 3 years almost..I am not rich so they actually suggested the kb400s & milling the heads to get where I needed to be..diamonds we be great but not in my budget..I will make it work in the end hopefully!

[SHARP68]

I agree there is not very good choices..just have to make due with what we have.  383 is a bum motor by most but I know if you work it right it can be a great reliable street motor.  I am hopefully getting there & again thank you to everyone's input!

[Supercharged Riot]

Im running into issues with finding a good set of pistons as well
Not a lot of support for the 383 compared to the 440

[JB400]

Try finding a set for a 400.  My dad waited 5 years for the right ones

[Supercharged Riot]

Was he building a non stroker 400 Engine?

[JB400]

he was building a stroker.  This was in the 90's.