ssg shadow

I have a Callies 383 stroker kit in my LT1. All forged.
The pistons are 16cc dished .030 over.
How would I find the compression ratio?
What I'm worried about is it not running well naturally aspirated.
Would I have to run a turbo?
I bought the engine like this, and its never been run.
Thanks for the help.

RamAir95TA

iTrader: (2)

Depends on more than the piston dish and diameter. You also need head gasket thickness, deck height, and combustion chamber size.

Going further, to calculate your DCR, you need to know your particular camshafts IVC ABDC, in degrees.

redbird93

if you know all the things he listed you can google compression ratio calculator and plug all the numbers in. if your running stock cc heads youll be 10.5 or a lil higher unless block was decked to zero and your using a 30" or thinner gasket youll be in 11 to 11.5 range.

ssg shadow

Its a 95 motor with aluminum heads. The heads are rebuilt stock and surfaced.
It says equal deck to crank centerline.
The build sheet does not specify cam size or gasket thickness for whatever reason.
These are the pistons that re in there. http://www.cnc-motorsports.com/produ...99&CtgID=16047
I got a scope and went in the spark plug hole to read the numbers off of them.
I'm just trying to find out if these are suitable for running naturally aspirated and still come out with alot of horsepower.

RamAir95TA

iTrader: (2)

So, you have a 383, with stock unported heads? You don't know what cam is in it?

Assuming stock head gasket with stock CC volume with a stockish deck height, your static compression is just under 10.0:1. Far below ideal for an LT1. Hey at least you can run it on 87 octane.

Changing to an .029" gasket will bump the compression to 10.4:1. Ideally, those pistons have to go. With a flat-top piston (and changing nothing else), your compression jumps from 10.0:1 to 11.2:1.

Sounds like this motor was built with Gen I SBC principles, unfortunately.

ssg shadow

I hear you on that.
Im pretty sure it was. I spoke with the machine shop that built it back in 2006 and of course they did remember the build but did say that they had only built a hand full of LT1s. This tells me they probably weren't familiar with it.
I am going carbed with this engine.
Im putting it in a 71 chevy truck. I am looking to hit 13's at a minimum.
I want it to be drivable in town.
So, do you have any advice as to what to get the heads ported to a nice cam and what type of pistons? I am assuming I pretty much cant use these.

ssg shadow

12661561 is the number on the heads.
What can I do with these to make them suitable for the bottom end?

JB_97ws6TA

iTrader: (6)

you've got to run a .026 head gasket and get your heads milled to get the combustion chamber volume down to around 54cc to net you around 11.2:1 which is just fine for a street motor. I am not sure how much would have to be milled off of the heads to achieve that volume but it is cheaper than buying a new set of heads.

ssg shadow

Well, I'm ok with getting new heads if I need to.
I see that you are running basically the same bottom end as mine.
You have 10.9:1 SCR. It seems that others say this isnt good. Why?
I dont know anything about LT1s which is why I am here but on a SBC, 10:1 is ideal for hitting 400+ hp and still running pump gas.

I think I need to take this engine to a machine shop to see whats been done thus far.
The sheet says "equal deck to crank centerline" That doesnt tell me how much its been decked.

ssg shadow

ttt