428

[DANNYGOTE]

😄 hi   I am new here .. my nickname on here is dannygote so H E L L O  every body .. got a  ? I cannot find how many cc's  in the piston top of a stock 428 Pontiac piston.. does any body know or know how I can find out ? I have tried to find it on the internet [ spent hours ] and I still haven't foud out.. if any body can help me out  I really will appreciate it …. thanx === dannygote

[Ringo64]

 I'm sorry I do not have an answer to your question but hope someone will shortly. 

[DANNYGOTE]

thanx

[SPRINT 6]

WELCOME to the board.

These charts from the Wallace racing site should assist you with that info;

http://www.wallaceracing.com/head1.htm

 

CHEERS!

Edited March 5, 2020 by SPRINT 6

[Last Indian]

6 hours ago, DANNYGOTE said:

😄 hi   I am new here .. my nickname on here is dannygote so H E L L O  every body .. got a  ? I cannot find how many cc's  in the piston top of a stock 428 Pontiac piston.. does any body know or know how I can find out ? I have tried to find it on the internet [ spent hours ] and I still haven't foud out.. if any body can help me out  I really will appreciate it …. thanx === dannygote

If it’s stock all the 428 heads were 72cc.

[Frosty]

Danny - are you asking how many ccs a stock 428 piston is up against a flat plate at TDC or how many ccs a 428 cylinder head is?

If it is the latter, then Sprint6 and Last Indians answers are correct.

Edited March 6, 2020 by Frosty

[Wrongway]

Danny, are you asking because you're needing to replace a couple of stock pistons or just out of curiosity? Because if you're looking to replace the stock pistons iv actually got 4 or 5 here that are in good condition from when I rebuilt my 428.

[Last Indian]

13 hours ago, Frosty said:

Danny - are you asking how many ccs a stock 428 piston is up against a flat plate at TDC or how many ccs a 428 cylinder head is?

If it is the latter, then Sprint6 and Last Indians answers are correct.

Danny if you are asking for the former, as Frosty has described and you have a piston available the measurement is quite easy. Take a piece of 1/4 inch polycarbonate sheet large enough to cover the top of the piston, basically a flat plate. Ou can use other materials, but the polycarbonate allows you to see any air that’s trapped. Hold the polycarbonate to the piston with a couple of C clamps and see where the most logical place is to drill a 1/8 diameter through hole. Mark that spot, remove the plate, drill the hole and remount the plate. Take a graduated cc syringe fill it with water. Fill the space between the plate and piston with the water till all the air is gone. Deduct that amount from what the total volume was in the syringe and that’s the piston top cc volume. You may have to practice with it a little to get the technique down.

[DANNYGOTE]

On 3/5/2020 at 8:51 PM, Frosty said:

Danny - are you asking how many ccs a stock 428 piston is up against a flat plate at TDC or how many ccs a 428 cylinder head is?

If it is the latter, then Sprint6 and Last Indians answers are correct.

no the 428 and 421 piston  itself has a dish type recess involving the valve reliefs on the top of the piston and I am trying to find out how many cc's  there are so I can figure out the compression I am trying to achieve , thanx for you guy's for your input    thanx == danny

[TWO LANE BLACK TOP]

The graduated syringe...Clear plastic plate method..That Last Indian explained is an accurate way to determine the CCs of the dish including the valve reliefs on the tops of the pistons... 

Edited March 7, 2020 by TWO LANE BLACK TOP

[DANNYGOTE]

that will absolutely work …. thanx a million...   danny