Its a 383 with forged flat tops and I will be running Le3 heads. This car will have nitrous and A LOT of it lol. Which head gasket will be best for this setup. It will have about 12.5:1 compression, but I am trying to get it down to 12 to 1.
the pistons are zero decked in the hole
no head gaskets are used yet because its a new engine.
pistons are 12.1
dome volume is 6cc
comp. height 1.125
236/240 .592/.592 cam specs
Le3 heads 57cc
4.030, 3.75 stroke and a 6" rod hope this helps everyone


What else do I need for you guys to tell me what you have. How bout you Joe? ramairta95? My setup is kinds like yours, what do you have?

anyone else, thanks

hows this head gasket for a 200 shot?? mls 3140g by mr gasket?

 

spraying alot i would run a fel pro mls or cometic

 

Im sure the guy would love part numbers!

 

cant give him them..he says he has 12.5-1 now but dont list his head cc or what the gasket thickness is right now he using..he also dont say how much down in the bore he is atleast or really gives comp height on his piston and the deck height so some one can do the math..

 

added more info

 

you need the cc of your chambers..are they 58cc?

 

if the pistons are at deck height id run a .040 gasket. let your pistons and chambers dictate compression, not your gasket.

 

if Lloyd specd the cam based off of 12.5:1 compression, run the gasket that gives you that compression

 

i disagree

 

So do I, the cam you can put into whatever engine you want. What is the heads cc anyway if they are LE3s?

 

help me

 

I'm a big proponent of a tighter quench (.030" to .035").

You say you have domed pistons in a +6cc volume. If that's the case with those heads, your SCR is going to be through the roof (14.0:1+) even with a thick head gasket. Are you sure you don't have flat-tops in a MINUS 6cc? If that's the case, then with an .040" gasket, your SCR would be around 12.0:1. Using a .028 Impala head gasket will put you around 12.3:1.

I would go with the .040" gasket like Wicked mentioned.

 

Nope the part number is sbc125030d05 and its +6

When doing the math I had just checked a website calculator and found out that with a 4.030 bore 3.75 stroke and this piston and 57cc head and using a .040" head gasket I would have 11.9 compression ratio. Where did you get your info. I know your better than me with this stuff but im really confused now.

 

If you have a +6 for dome and everything is correct using a .41" head gasket will put you at 11.98 compression. So that would be perfect for street driving and to use pump gas

I hope this helps ya

 

Static compression ratio of 11.98:1.
Your dynamic compression ratio is 8.79:1 .
.040" head gasket is the way to go and pumpgas will be your friend

 

You sure buddy , I just want to make sure everything is going to be perfect. I got this LE3 package sitting here waiting to be installed . Ill post pics soon also for everyone

thanks

 

Hows this mr gasket mls 3140g head gasket for a 200 shot?

 

Using this calculator and the following data:

Bore 4.030"
Stroke 3.75"
Deck height 0
Gasket Thickness .040"
Head volume (57cc MINUS the +6cc of the pistons) 51cc

...I get 14.2:1 static compression.

The part number for the pistons that you provided doesn't show up via any search. Can you link me to the Summit page?

 

scroll down to the 305 flat top section you will see it their.

http://www.race-mart.com/Mahle_PowerPak_Guide.asp

 

I see it, and stand by my most recent post. Maybe I'm overlooking something...perhaps someone else can chime in, but there's no reason you should be using a domed piston, IMO.