PONTIAC SLP

iTrader: (3)

Hi like it says , I need someone to calculate my Compression Ratio

Bore 4.185 Wiseko ( Part # K462X185 ) Flat top , dome -2.8
Stroke 4.125
Cylinder Head Volume 58cc
Heads Gaskets .051

This going on LSX Bowtie

Thanks in Advance

DAVESS02

iTrader: (30)

Assuming a 4.2 gasket bore, and 10 thou above the deck with 2.8 cc valve reliefs, 14.26:1

PONTIAC SLP

iTrader: (3)

It's good compression ? or very high CR ? , It's race car

DietCoke

iTrader: (18)

Negative 2.8cc pistons nets 13.86:1 @ zero deck. Certainly race gas/ethanol compression level.

tex1978

iTrader: (3)

Umm, man if you dont have a clue about CR, and it sounds like you dont, then Im gona go out ona limb and say you dont have any business fooling with a 14 to 1 motor. Dont take that the wrong way. 14 to 1 is HIGH.....it wont run on pump gas I can tell you that.

PONTIAC SLP

iTrader: (3)

thanks , What octane should run ? How about C16 or higher ?

lol i know but i wanna be sure , This is not my first build but wanna be sure like i said , I built many engines for my customers but this is the strongest motor i wanna build for Street race car , LSX 454 ,LS7 All pro heads 410CFM , Solid roller , 400HP through foggers , fast 102 intake , kooks 2 inch headers , How that sounds ?

Also we built the strongest motor for Drag strip BBF 632ci with 1000HP of nitrous

Check our workshop pics

https://www.facebook.com/wsseven?sk=...0493575&type=3

DietCoke

iTrader: (18)

14:1 will run fine on 100 octane, but C16 is one better, will be able to get more power from the motor.

litle88

iTrader: (20)

I'm confused is it a flat top, domed or dished?

Is it domed + ? with -2.8 valve reliefs?
Is it flat with -2.8cc valve reliefs?

Is that a stock GM head gasket?

I would seriously check PTV at this compression. What cam are you using?

litle88

iTrader: (20)

13.85 cr here too.

PONTIAC SLP

iTrader: (3)

I'm confused too , But when i asked my friend he said it's flat top with domed -2.8cc vavle reliefs , No it's Cometic .051 , the cam is custom Cammotion solid roller and 900lift valve springs