[94guy]

i have a 95 lt1 car. 355 block is decked .002 flattop 4.86cc's gasket is .039, 3.48 stroke, 5.7 rod, chambers are 54-56cc's. the cam adv.272-286 and [email protected] can someone tell me if this is safe?

 

[94guy]

someone

 

[Guest]

OK, is your piston down in the hole .002"? or you took .002" off your decks so they are close to say .023" down in the hole now??

Then I will run it through the ROSS Racing Pistons compression ratio calculator for you. Then run it through the BOOST Calculator site to get to a Eff/D CR. number for you...

BUT I have a feeling you are too high compressioned unless you have aluminum heads????

I just ran it using a .039" hg, a 55 cc chamber head, a -4.86 cc valve notch flat-top piston and a down in the hole of .023" and you are at 10.99 to be exact!

You need at least a 63 cc head, imho to make right at 10 to 1 CR which will give you a Eff./D. CR. of 8.04 at 600 feet elevation like me or thereabouts with that cam so you can still use decent pump gas..

(I used 272/210/286/224, 110/106 and guessed at the lifts of .450"/.480" to get the intake valve closing point of 62 number!!).....

Get back..

Check me guys!!

pdq67

Best Car Insurance | Auto Protection Today | FREE Trade-In Quote

 

[94guy]

yes it's aluminum heads. the piston is .002 in the hole after decking. adv is 272-286 [email protected] intake valve closes at 67.0. valve lift with a 1.6 is .510-.548. can you run it again

 

[94guy]

pdq67 where you at?

 

[94guy]

anyone

 

[Wolfplace]

anyone

=
http://cochise.uia.net/pkelley2/index.html

 

[Guest]

Your Eff./D. CR. is 8.97!! Static CR. is 11.63 or thereabouts using 55 cc heads.

Using a 355, 55 cc's, 67, -4.86 cc, .039" composites, .0001 psi for boost which is zero and 600 feet for elevation here where I am.

TOOO HIGH, imho....

pdq67

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