santiago

iTrader: (28)

if i use a .40 gasket with 66cc stage 3 ported 317's my comp will be at 11:1 right? i jus need someone to verify this.
i have zero deck.
-8cc pistons
257/266 cam 110 lsa
thanks

WickEdSix98

iTrader: (4)

Bore size? Stroke?

ls1290

iTrader: (20)

One stock bore( 3.905 ) and crank ( 3.622 ), you are looking at 9.3:1. -8cc valve reliefs are pretty big for a stock cube motor.

I noticed your sig and you have a 408. With that info, you are about 10.6:1

Keith

santiago

iTrader: (28)

yes it is a 408. i wanna get 11:1 so should i have them mill to 64cc?

santiago

iTrader: (28)

on here it says i will have 11:2 i dont understand?
http://www.dmperf.com/compression.htm

santiago

iTrader: (28)

ttt..

Dmoney

iTrader: (22)

I got you at 11:15. That would explain how you got 11:2. It's just rounded up...........

santiago

iTrader: (28)

what did you use 64cc or 66cc

brad8266

iTrader: (23)

Youre gonna have to mill the **** out of those to get 64 CC's on the 317 heads. Isnt the 317 head 72cc stock?

ls1290

iTrader: (20)

calculator

This is the calculator I have been using. I agree with brad8266 in that the heads will have to be milled a lot or the chambers are going to have to be built up. Milling the head too much will weaken the deck strength and building up the chambers is not cheap. Better off getting a new set of heads with smaller chambers.

Keith

Dmoney

iTrader: (22)

66cc...............

santiago

iTrader: (28)

thank you

santiago

iTrader: (28)

your vette is gona be a monster when you get that set up goin....mine will be a little troll