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Post Info TOPIC: compression ratio help??


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compression ratio help??


OK bear with me here because i'm trying to get a ballpark idea without having all the information. The engine i'm building will be a 347ci, 4.30 bore, 5.4 rod 3.4 stroke. The rotating kit i want want has -5cc flat top pistons that would yield 10.8 compression w/ 64cc heads. It is an eagle all forged from summit, doesn't have anything about head gasket thickess. I have no clue about what thickness head gasket to run anyways, or to be honest how to even calculate this. I'm going to have a pro do most of the work but want to be knowlegable about things. I bought a set of new Victor JR's that have 60cc chambers. I tried online calculaors, didn't have all the info. I know i will be over the pump gas octane which i don't mind. The closest i found was a -3cc was around 11.2 to 1 roughly. It didn't say what size head gasket. My question is would -5cc be more or less compression? Any help would be greatly apprciated. Boss block alsosmile.gif

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http://www.rbracing-rsr.com/compstaticcalc.html

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91 Mustang lx Hatch 6.0 LSX


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that motor sounds sick lol. N/A or turbo/supercharger?

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89 GT 306,Vortech SC-Trim,GT40P heads,Cobra Intake,65mm FRPP TB, 42lb Injectors,PMAS MAF,190lph pump,E303,Crane Adj. 1.6 RR's,FRPP Headers,Pype's X-Pipe,Magnaflow cat-back,Spec Stg II Clutch,Tremec 3550 w/Pro 5.0 shifter,FRPP Alum. Driveshaft,3.55's.


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Naturally aspirated, the compression is gonna be too high for nos or a sc, for me anyway,lol. I would be super happy with 450ish horse at the motor, i think thats conservative and very obtainable. Been building the car for two years now and its a roller and i'm finally ready for the drivetrain. The Boss block will give me the ability to go other routes, that's why i'm keeping it at 30 over for now.

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hey thanks that calculaor gave me a static compression of 1.38, do i times that times 8, i dunno if so that gives 11.04. That's by me putting in a .40 gasket.

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you will get me uppp for nothing

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306 procharged 84 hatch


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i imagine its 4.030 not 4.300 over bored 300 over wouldent work

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my girlfriends not a slut shes a seamon demon


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Sounds like a good combo- sorry I think I was typing in my sleep two posts ago!

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306 procharged 84 hatch


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I was wondering what the heck you meant Mcnally351,lol. No worries, was half asleep myself but was going crazy trying figure out compression calculators. I like the color of your stang too.

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Thanks, yeah I was a half case deep, did you figure out the ratio?

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306 procharged 84 hatch


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I think i now have a good idea. I'm definetly not building the engine myself. researching and saving my money,lol.

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