how far down mill 243's
how far down mill 243's i have a couple of ported 243's laying around..
i wanted to know how far down can i mill to get to 58-59 CC, w/out having PVC problems , or having problems with the intake.
my cam has a .581 lift on a 112lsa, that's the highest lift im going with.
i wanted to know how far down can i mill to get to 58-59 CC, w/out having PVC problems , or having problems with the intake.
my cam has a .581 lift on a 112lsa, that's the highest lift im going with.
lift isn't the issue, PTVC issues are mainly with opening of the intake valve.
If you have a early opening intake or late closing exhaust, associated with overlap, thats where you find issues.
with 59cc 243 heads largest cam i've seen run is speed inc. SI5v2 231/237
If you have a early opening intake or late closing exhaust, associated with overlap, thats where you find issues.
with 59cc 243 heads largest cam i've seen run is speed inc. SI5v2 231/237
On The Tree
Joined: Dec 2007
Posts: 182
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From: akron ohio
I am wondering this to. Except everyone I have talked to has said that if you mill them you have to keep you duration 230 or below for got ptv. Hope someone can shine a little light on this. Thanks
im gonna be running 228R cam..and dont plan to go any higher on cam- might mill a bit more 2 boost up more compression
TECH Addict
Joined: Mar 2009
Posts: 2,099
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From: Texas/Afghanistan
i would like to know also. i have a set of stock 243's i want to mill (along with other things). my cam is 224/224 .581/.581 so i don't think i'll clearance issues. i just want a good CR to run on 93 octane. i was thinking .030-.035?
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If the heads have stock valves in them you should be have enough room with a 59cc chamber and the 228R. I always recommend checking though, especially on a setup like this where the heads have been milled a decent amount.
i have a set on my 5.3 shaved them 0.030 and have a 0.040 head gasket with a 224/228 .581/.588 and have no clearance issues... course i know 5.3's pistons are dished and ls1's are flat. hope this helps
I run 243's that have been milled .020" (62cc) with a .051" GM MLS gasket. With a 224 intake lobe I only have .068" piston to valve clearance. Check it your self, don't believe everything you read on the internet.
my exact thoughts too...bullshit...
someone needs to learn how to measure...plenty of clearance too, not even tight...
measure yourself guys with a SOLID roller...
some measurements I have taken
stock 241 heads unmilled, stock mls gasket 230/230 111+2
intake .086 exhaust ~.120
TFS 215 57.5cc chambers, .040 gasket, 239/243 110+3
intake -.020 exhaust .040
someone needs to learn how to measure...plenty of clearance too, not even tight...
measure yourself guys with a SOLID roller...
some measurements I have taken
stock 241 heads unmilled, stock mls gasket 230/230 111+2
intake .086 exhaust ~.120
TFS 215 57.5cc chambers, .040 gasket, 239/243 110+3
intake -.020 exhaust .040
