Are they + or - cc's and deck clearance
Thread Starter
Registered User
Joined: Feb 2001
Posts: 878
From: Clovis, NM
Are they + or - cc's and deck clearance
On the stock 3.4L cast pistons, are they dish dome of flat?
Any one know how many cc's + or - they are?
They should be about -3cc
I cc-ed my heads and there right about 55cc's and I want to bring them down from the stock C/R of about 9.5:1 to about 8.7:1 to 8.9:1 .
And what is the deck clearance???
I need to calculate compression for my turbo heads
I think they are flat or dish.
This is what I think the inside of a 3.4 looks like please correct me if I'm wrong.
Bore..............................3.62''
Stroke...........................3.31''
Rod length....................5.7''
Deck hight.....................8.819''
Piston pin......................1.46''?
Chamber Vol.................55cc (on my heads)
Head gasket dia...........3.62''
Deck hight clearance....0.004''
Compression Ratio.......9.44:1
Some of there numbers I know are correct others are my best guess and look about right.
Any one know how many cc's + or - they are?
They should be about -3cc
I cc-ed my heads and there right about 55cc's and I want to bring them down from the stock C/R of about 9.5:1 to about 8.7:1 to 8.9:1 .
And what is the deck clearance???
I need to calculate compression for my turbo heads
I think they are flat or dish.
This is what I think the inside of a 3.4 looks like please correct me if I'm wrong.
Bore..............................3.62''
Stroke...........................3.31''
Rod length....................5.7''
Deck hight.....................8.819''
Piston pin......................1.46''?
Chamber Vol.................55cc (on my heads)
Head gasket dia...........3.62''
Deck hight clearance....0.004''
Compression Ratio.......9.44:1
Some of there numbers I know are correct others are my best guess and look about right.
Registered User
Joined: Nov 2001
Posts: 657
From: carbondale IL \ Alton IL (outside St Louie MO)
isnt the deck height measured from the top of block to the top of the piston?
and why do you need the head gasket diameter? shouldnt you need the thickness of the gasket
and why do you need the head gasket diameter? shouldnt you need the thickness of the gasket
Registered User
Joined: Jun 2000
Posts: 190
From: Chatsworth, CA
you need diameter and thickness. and as for the CC's of the heads...trust me its 53cc. (GM published spec). if you have more someones gone in there with a tool and cut some of the metal out..
all of the 3.4L pistons from 1993+ are dished. how deep the dish is -- thats the question. still have yet to find this out for myself, and i have changed my pistons from the 3.4 iron head to the 3.4 aluminum head..problem is i never handled either piston.
word of advice - why not just take the info you DO have and do some solving for the dish volume?
just a thot.
-R
all of the 3.4L pistons from 1993+ are dished. how deep the dish is -- thats the question. still have yet to find this out for myself, and i have changed my pistons from the 3.4 iron head to the 3.4 aluminum head..problem is i never handled either piston.
word of advice - why not just take the info you DO have and do some solving for the dish volume?
just a thot.
-R
Thread Starter
Registered User
Joined: Feb 2001
Posts: 878
From: Clovis, NM
No one has taken a tool to the inside of the heads, the sand casting marking are are still there.
The distance of the piston when at TDC to the deck is deck clearance, the deck hight is the distance from the crank shaft center line to the deck.
The distance of the piston when at TDC to the deck is deck clearance, the deck hight is the distance from the crank shaft center line to the deck.
Thread Starter
Registered User
Joined: Feb 2001
Posts: 878
From: Clovis, NM
No one has taken a tool to the inside of the heads, the sand casting marking are are still there.
The distance of the piston when at TDC to the deck is deck clearance, the deck hight is the distance from the crank shaft center line to the deck.
The distance of the piston when at TDC to the deck is deck clearance, the deck hight is the distance from the crank shaft center line to the deck.
Thread Starter
Registered User
Joined: Feb 2001
Posts: 878
From: Clovis, NM
No one has taken a tool to the inside of the heads, the sand casting marking are are still there.
The distance of the piston when at TDC to the deck is deck clearance, the deck hight is the distance from the crank shaft center line to the deck.
The distance of the piston when at TDC to the deck is deck clearance, the deck hight is the distance from the crank shaft center line to the deck.
Thread Starter
Registered User
Joined: Feb 2001
Posts: 878
From: Clovis, NM
No one has taken a tool to the inside of the heads, the sand casting marking are are still there.
The distance of the piston when at TDC to the deck is deck clearance, the deck hight is the distance from the crank shaft center line to the deck.
The distance of the piston when at TDC to the deck is deck clearance, the deck hight is the distance from the crank shaft center line to the deck.
Thread Starter
Registered User
Joined: Feb 2001
Posts: 878
From: Clovis, NM
No one has taken a tool to the inside of the heads, the sand casting marking are are still there.
The distance of the piston when at TDC to the deck is deck clearance, the deck hight is the distance from the crank shaft center line to the deck.
The distance of the piston when at TDC to the deck is deck clearance, the deck hight is the distance from the crank shaft center line to the deck.
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