how many thousanths milled off 5.3 heads to get 12/1 compression?

Reply Subscribe

Thread Tools

Search this Thread

02-06-2004, 09:54 AM

KMStevens

TECH Apprentice

Thread Starter

iTrader: (4)

Join Date: Nov 2001

Location: lebanon, ohio

Posts: 304

Likes: 0

Received 0 Likes on 0 Posts

how many thousanths milled off 5.3 heads to get 12/1 compression?

stock they are 11/1 compression correct? would i need to get .30 or more taken off to raise that a point?

Reply Like

02-06-2004, 04:02 PM

XFiveLiter

TECH Resident

Join Date: Feb 2002

Location: Schererville, IN

Posts: 992

Likes: 0

Received 0 Likes on 0 Posts

I think .030 would get you about 11.4-11.5. I think you would have PV issues at 12:1, unless you used a stock cam.

Reply Like

02-06-2004, 04:23 PM

Pro Stock John

LS1Tech Co-Founder

iTrader: (34)

Join Date: Nov 2001

Location: Chicago, IL

Posts: 44,653

Likes: 421

Received 1,099 Likes on 721 Posts

5.3 = 62cc
5.7 = 67cc

5 cc difference so stock it will take a 10.1:1 motor to 10.5:1. So .050 if you could get away with it will get to 11:1 or so... (that's what I hear).

Reply Like

02-06-2004, 04:46 PM

Magred2001vette

TECH Enthusiast

iTrader: (2)

Join Date: Nov 2003

Location: Dallas, TX

Posts: 621

Likes: 0

Received 0 Likes on 0 Posts

I just ordered a set of PP5.3 w/ 59cc chambers. If I'm going to use a small cam like a 224/224 .583 112 would I gain HP/TQ by milling to raise compression even more?