Block # gurus...

[69Bee]

Measure the dia of the dish, and the depth.
V=pi*r^2*h

Where:
r=dia/2
h=dish depth

This will get you close enough. As far as the deck height, measure it and use:
DHv=(b/2)^2*51.48*h

Where:
DHv=Deck Height Volume
b=Bore
h=Deck height

 

[jeepthrills01]

2315s are out...no std size available.
I just measured all 4 open holes...4.257 from top to bottom

 

[69Bee]

Deck height is measured with the piston at TDC, then measure from the block deck to the top of the piston (not the dish).

 

[69Bee]

2315s are out...no std size available.
I just measured all 4 open holes...4.257 from top to bottom

Do yourself a favor, and disassemble the block, align hone (if not already done), square the block (it has not been done), and bore cylinders 0.030" over.

 

[jeepthrills01]

Dish ballparks at .653
DhV about 1.632

 

[jeepthrills01]

Assuming 51.48 is gasket bore? Or what does that represent?

 

[jeepthrills01]

Im coming up with 10.4....does anyone see an error?

 

[69Bee]

Dish ballparks at .653
DhV about 1.632

I think you mean 0.0653", your number is over 5/8" deep. Whar is the dia ov the dish?

 

[69Bee]

Assuming 51.48 is gasket bore? Or what does that represent?

That is a number that you use to basically convert the result to CC's. (for this example) What gasket ( PN#) are you using? You should also be using ARP head bolts or studs. The OEM headbolts will damage the aluminum heads.

 

[jeepthrills01]

Cometic C5459-027 is the gasket
2.88 diameter of dish
.09 depth of dish

 

[1 Wild R/T]

Im coming up with 10.4....does anyone see an error?

View attachment 1063392

Well 3.75 stroke is a 440, not a 383... And your piston volume is listed as negative when a negative represents a dome, your number should be positive...

 

[jeepthrills01]

Oops on the stroke..but not the dish..its right
"Dished negative"

 

[1 Wild R/T]

Oops on the stroke..but not the dish..its right
"Dished negative"

View attachment 1063474

Well then you found the odd ball calculator...

 

[jeepthrills01]

9.5....with proper 3.38

And i have a habit of finding the unusual..lol

 

[jeepthrills01]

Well then you found the odd ball calculator...

View attachment 1063478

What does your caclulator come up with?

 

[1 Wild R/T]

Humor us.. Recalculate using a positive number for piston dome volume.... If positive is wrong your C/R will increase substantially... Ain't no way a 383 with dished pistons is 9.5-1 C/R...

 

[1 Wild R/T]

What does your caclulator come up with?

Diamond Pistons, but every other calculator I've ever used has piston volume expressed as a negative number equals a dome...

 

[jeepthrills01]

Humor us.. Recalculate using a positive number for piston dome volume.... If positive is wrong your C/R will increase substantially... Ain't no way a 383 with dished pistons is 9.5-1 C/R...

Hmmm dropped to 9.4...

 

[jeepthrills01]

Diamond calc...9.5

 

[jeepthrills01]

69bee had that formula as ...im guessing ....a TLAR...(That Looks About Right) estimator...i guessing we can assume 10-15% error in it? Id like someone else to run those dish numbers...see how far off base this really is.

Dish is 2.88 diameter x .09 deep.