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Author Topic: Need help piston shopping  (Read 752 times)

Leaburn Patey

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Need help piston shopping
« on: November 18, 2009, 02:42:57 PM »

Yep.
Not much out there in the way of 383 pistons.
Just would like some feedback or any suggestions on what to use.
Also the BoaB's compression ratio is 9.2:1 and I would like to keep it that way or go up a wee bit---not down.
I am not good at "engine building math"
One piston supplier shows that I will have a CR of 8.7 with the 906 heads that have a 88CC open chamber.
Not really what I am after.
I want good power but she is gonna be a cruiser and not get the tar beaten out of it or get raced.
Yes,I have spoken to the Joisey Mob Boss--just would like to hear more opinions.
Any advice is appreciated and thanks in advance.
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1968 Newport Custom project BOAB
1973 Satelitte wagon
1983 Dodge 400
2006 300C HEMI!!

Leaburn Patey

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Need help piston shopping
« Reply #1 on: November 18, 2009, 03:21:36 PM »


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Herman

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Need help piston shopping
« Reply #2 on: November 18, 2009, 03:38:35 PM »



If you're set on using those open chambered heads, you might be able to use this one:
http://www.kb-silvolite.com/performance.php?action=details&P_id=327

Your CR will be a very loose estimate until you really measure the chamber size on the heads.
You'll also have to measure piston to heads clearance depending how far the dome pops above the deck.

If you want more CR you can always have the heads milled a bit more ofcourse.


BigBlockMopar2009-11-18 20:39:34

firedome

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« Reply #3 on: November 18, 2009, 03:57:53 PM »

I would try to stay with stock compression, but that's just me, and I'm not a go-faster.

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Steve

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« Reply #4 on: November 18, 2009, 05:02:38 PM »

I told you to use 9.5's.  Then you can run regular gas and not have to worry abotu detonation problems.  Just make sure the RAD is a quality brass equal.  You already have the fan
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Rich

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Need help piston shopping
« Reply #5 on: November 18, 2009, 08:32:14 PM »



I used these KB 9.7:1 pistons in my 383 with 88cc #346 heads:

http://chucker54.stores.yahoo.net/6ccsoliddome.html
krautmaster2009-11-19 01:34:20
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Stan Paralikis

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« Reply #6 on: November 19, 2009, 02:42:20 AM »

still  say to go with the MP pistons from Summit! 


(and stop listening to the wannabe boy-racers over at Moparts
 
 
Quote
For budget or stock-style rebuilds, it's hard to beat the value of Mopar Performance cast pistons. Mopar Performance cast pistons are made from high-quality aluminum alloys and feature the OEM quality that you have come to trust. And because they're designed and manufactured to OEM specs, they'll provide improved reliability, performance, and a long service life.


 

 
Commando12009-11-19 09:25:13

Stan Paralikis

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« Reply #7 on: November 19, 2009, 03:13:51 AM »

Or takes yer chances...
 
mopar 383 pistons - $175 (sun city)
 

Leaburn Patey

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« Reply #8 on: November 19, 2009, 04:25:59 AM »

Quote from: POLARACO
I told you to use 9.5's.  Then you can run regular gas and not have to worry abotu detonation problems.  Just make sure the RAD is a quality brass equal.  You already have the fan
Yep,26" rad and it is all real-$325.00 worth-- Not the cheapo tin/plastic aftermarket crap..

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1973 Satelitte wagon
1983 Dodge 400
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Leaburn Patey

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Need help piston shopping
« Reply #9 on: November 19, 2009, 04:27:24 AM »

Quote from: Commando1
Or takes yer chances...
 
mopar 383 pistons - $175 (sun city)
 
Thanks,but no thanks.
Going new.
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1973 Satelitte wagon
1983 Dodge 400
2006 300C HEMI!!

firedome

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« Reply #10 on: November 19, 2009, 04:34:12 AM »

Lea - where do you get the real brass Rad, do they have em for
318?  My rad shop wants $250 to recore my old one,  new isn't
that much more... but do want all brass... & where are they made?

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Herman

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« Reply #11 on: November 19, 2009, 04:40:04 AM »

The pistons on Summit say nothing about headchamber sizes, compression ratio, piston-top to deck height or pistonpin-distance.
For all you know you end up with smog-motor pistons which only create a slight draft inside the cylinders instead of a healthy compression ;)




Leaburn Patey

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« Reply #12 on: November 19, 2009, 05:19:56 AM »

For all you know you end up with smog-motor pistons which only create a slight draft inside the cylinders instead of a healthy compression ;)
[/QUOTE]
I agree.
I also gave up.
I am taking the motor,rod assembly,crank,etc to a more professional shop.
I spoke to Rob at Bullet Engines.
http://www.bullet.on.ca/index.html
I should have gone there in the first place.
They will order in pistons,bore the block and balance the reciprocating assembly.They also want the heads to measure the cc's and valve to pistion clearance.He also will weigh the pistons,rods,etc.
He will have to hot tank (again) after the bore job,so another set of cam bearings wasted--even though they never were used.  
I am not good on engine math so I trust Rob and his staff's expertise.
They were instrumental in the building of my 440 back in 2004.
 
More than likely,I will let them build the motor for me since I lost confidence in myself and other shops.
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1968 Newport Custom project BOAB
1973 Satelitte wagon
1983 Dodge 400
2006 300C HEMI!!

Stan Paralikis

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Need help piston shopping
« Reply #13 on: November 19, 2009, 07:35:33 AM »

Commando12009-11-19 12:39:05

firedome

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« Reply #14 on: November 19, 2009, 08:03:42 AM »

Source for a brass radiator?

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