243+ms4+fly cut

Reply Subscribe

Thread Tools

Search this Thread

Jan 9, 2007 | 09:55 PM

caviness

Thread Starter

TECH Enthusiast

iTrader: (14)

Joined: Apr 2006

Posts: 698

Likes: 4

From: Liberty,NC

243+ms4+fly cut

i have a set of 243 stock,how much can i mill them with .040 head gasket,2000 model ls1 stock,and ms4 on 111 lsa,i would like around 10.8 scr and 8.4 dcr or close to optimal? im not sure how high i can go i will be running 93 pump gas also be spraying latter if that makes a difference about 150 or 200 shot. also how much can i flycut piston .080 or .100,and will i need to flycut exhaust valve?

Jan 9, 2007 | 10:03 PM

brad8266

TECH Senior Member

iTrader: (23)

Joined: Aug 2005

Posts: 8,797

Likes: 0

From: Watertown, NY

To get a good answer on how much you need to mill and valve relief you would need to take it to a shop and have them perform measurments on it. Its almost impossible to give you a number.

Jan 9, 2007 | 10:11 PM

caviness

Thread Starter

TECH Enthusiast

iTrader: (14)

Joined: Apr 2006

Posts: 698

Likes: 4

From: Liberty,NC

well since ill be doing the work. i thought i could get some stuf ready before i pull the topend.not looking for perfect just close.

Jan 9, 2007 | 10:13 PM

brad8266

TECH Senior Member

iTrader: (23)

Joined: Aug 2005

Posts: 8,797

Likes: 0

From: Watertown, NY

Quote:

Originally Posted by caviness

well since ill be doing the work. i thought i could get some stuf ready before i pull the topend.not looking for perfect just close.

well too close and you crash pistons into valves.

Jan 9, 2007 | 10:28 PM

caviness

Thread Starter

TECH Enthusiast

iTrader: (14)

Joined: Apr 2006

Posts: 698

Likes: 4

From: Liberty,NC

at around 10.8 scr ptv going to really be that close after flycut?

Jan 9, 2007 | 10:32 PM

brad8266

TECH Senior Member

iTrader: (23)

Joined: Aug 2005

Posts: 8,797

Likes: 0

From: Watertown, NY

Quote:

Originally Posted by caviness

at around 10.8 scr ptv going to really be that close after flycut?

With that cam it could be possible. With that setup(assuming you have 2cc of relief in the piston) it will take almost 7 cc of head milling to get to the 8.3 DCR area, which is approx .042 of deck off the head. With that much deck gone you now may hit the pistons still. This is calculated with a 111 LSA with a 110 ICL. the calculations may be off some but should be ballpark.

Last edited by brad8266; Jan 9, 2007 at 10:43 PM.

Jan 9, 2007 | 11:31 PM

cws T/A

TECH Fanatic

iTrader: (3)

Joined: Apr 2006

Posts: 1,284

Likes: 0

From: Texas

https://ls1tech.com/forums/dynamometer-results-comparisons/539900-480rwhp-magic-stick-4-camshaft-prc-stage-2-5-ls6-fast-90-resullts.html heads cut .030 // .080 flycut Int/Exh

Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin

Verdad Gallardo

6 Common C5 Corvette Failures and What's Involved In Repairing Them

Pouria Savadkouei

Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph

Verdad Gallardo

Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked

Pouria Savadkouei

Top 10 Most Powerful Chevy Trucks Ever Made!

Hennessey's New Supercharged Silverado ZR2 Has 700 HP

Verdad Gallardo

Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes

Verdad Gallardo

Awesome K5 Blazer Restomod Comes With C7 Corvette Power

Verdad Gallardo

10 Camaros You Should Never Buy

10 LS Engine Myths That Refuse to Die

Verdad Gallardo

Jan 10, 2007 | 12:00 AM

PREDATOR-Z

TECH Senior Member

Joined: Mar 2004

Posts: 14,620

Likes: 17

From: BFE

Quote:

Originally Posted by cws T/A

https://ls1tech.com/forums/showthread.php?t=539900 heads cut .030 // .080 flycut Int/Exh

Yeah, that is good and since yours are stock valved (I think) you'll have better PTV.

Jan 10, 2007 | 12:18 AM

#10

caviness

Thread Starter

TECH Enthusiast

iTrader: (14)

Joined: Apr 2006

Posts: 698

Likes: 4

From: Liberty,NC

will that be allright on 93 pump gas.head cut .030 & .080 flycut?

Jan 10, 2007 | 02:26 AM

#11

cws T/A

TECH Fanatic

iTrader: (3)

Joined: Apr 2006

Posts: 1,284

Likes: 0

From: Texas

I get 11.40:1 Static - 8.4 Dynamic compression

60 combustion chamber
1.5cc flycutt
.040 gasket thickness
3.91 gasket bore
-.006 piston peeking out
3.898 cylinder bore
6.098 connecting rod
3.622 stroke
74.0 IVC @.006