caviness

iTrader: (14)

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?

brad8266

iTrader: (23)

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.

caviness

iTrader: (14)

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.

brad8266

iTrader: (23)

well too close and you crash pistons into valves.

caviness

iTrader: (14)

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

brad8266

iTrader: (23)

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.

cws T/A

iTrader: (3)

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

brad8266

iTrader: (23)

there ya go!!

PREDATOR-Z

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

caviness

iTrader: (14)

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

cws T/A

iTrader: (3)

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

caviness

iTrader: (14)

what can i get away with on pump 93 ? i didnt think i could go that high?

N4cer

iTrader: (11)

I'm about 8.75 DCR on 93 octane.

caviness

iTrader: (14)

thanks for all the info guys.