so i am building a 350 and trying to figure on my CR it should be around 8.23:1 with 22cc dished pistons and 64 cc 062 heads... running a .015 head gasket with stock length connecting rods and the XR270HR-10.. Now when i calculate the DCR i get about 7.52:1 is that to low? i used 43 IVC as comp measured thiers at .006 instead of .050 like my calculator.

and any of you blown guys with 10psi my DCR comes to 12.64:1 is that to high?

thanks

 

8.23 static?
I think 7.52 is a tad low, but with a blower you're just fine.
.006" IVC is a better spec to use IMHO.

I use this one
http://kb-silvolite.com/calc.php?action=comp
and just use the IVC angle at .006" (as 43? ) instead of one at .050" and then add 15*.

I must have used different numbers than you did..?

 

okay i had the IVC wrong the cam is 61 close not 43 i tried to adjust for the different measurments with that calculator i get a static of 8.5 which is better for me but it still wants the .050 measurment not the .006 that comp gives... any way to accurately convert them?
----
i see now didnt get your attachment
my bore is standard not oversized

and i have gone through so many calculations at this point my math is very iffy

 

It asks for .050" + 15*, which is supposed to represent .006" or thereabouts. Since the intake valve needs to be completely closed before it completely stops flowing. I think .050" is usually easier to get so they give you that cheeseball 15* guesstimate thing.

I skip the middleman and just use the one comp gives, 61*. 61* makes more sense than 43*, my cam is in that ballpark of size and is about 62* IIRC.

Intercooled build up?

 

it will be intercooled as soon as i find one.

and i dont think i will be using the S/c most likely a turbo set up

 

Yea, a little on the low side, but I think you'll be ok. Is this a brand new block? Check the block deck and head deck surfaces. If they aren't freshly cast, i'd get 'em planed until they're flat as glass. Head studs and a copper head gasket. Cut o-rings into the heads if you want.
Then boost it up, intercool it, and run it up to 18psi or so. Rig up some water injection and go even faster.
Hope your turbo's are sized right.
But hey, that's a whole 'nother thread eh?

 

we will see about 18psi... hopefully if the car will play along... just trying to get this beast up and running and not have to worry about things i should have done but decided they didnt apply to me....

the machine shop says they checked the block and heads... and they are good to go... but like any measurment taken by someone else i dont know if i trust it but hey i cant check it accuratly enough for me so i will have to go with thier word.

 

You got a steel ruler and a set of those shim measuring dealies? (the name escapes me now...) That'll let you know how flat the deck is. They know this is going to be a turbo build? You get some crazy big cylinder pressures in there.
Gap the rings big too, the pistons will expand from the heat, don't want to lift a ring land. Should be a blast when it's done though.

 

they know and were not excited they wanted a .060 head gasket to drop my CR even lower

I tried it with feeler gauges but thought there had to be a more accurate way everytime i take those out i feel like i am in the stone age with a rock axe

 

i think i should mention that those guys have been known to ride a go-kart up and down US RT138 with a guy driving and a guy on the back spraying N02 at the briggs & straton