diff --git a/RealismOverhaul/RO_AIES_RealEngines.cfg b/RealismOverhaul/RO_AIES_RealEngines.cfg
index b0299c5a2c..11bf70cc00 100644
--- a/RealismOverhaul/RO_AIES_RealEngines.cfg
+++ b/RealismOverhaul/RO_AIES_RealEngines.cfg
@@ -1,5 +1,6 @@
 @PART[dest5Engine]:FOR[RealismOverhaul]:NEEDS[!RftS,!RealFuels_StockEngines]
 {
+	%yearIntroduced = 1989
 	%RSSROConfig = true
 	%title = 1kN Thruster
 	%manufacturer = EADS Astrium
@@ -110,6 +111,7 @@
 }
 @PART[engineexper05]:FOR[RealismOverhaul]:NEEDS[!RftS,!RealFuels_StockEngines]
 {
+	%yearIntroduced = 1998
 	%RSSROConfig = true
 	%title = RL10B-2
 	%manufacturer = Pratt & Whitney
@@ -238,6 +240,7 @@
 }
 @PART[enginelmodc]:FOR[RealismOverhaul]:NEEDS[!RftS,!RealFuels_StockEngines]
 {
+	%yearIntroduced = 1964
 	%RSSROConfig = true
 	%title = LM Descent Engine
 	%manufacturer = TRW
@@ -366,6 +369,7 @@
 }
 @PART[galaxvr2]:FOR[RealismOverhaul]:NEEDS[!RftS,!RealFuels_StockEngines]
 {
+	%yearIntroduced = 1997
 	%RSSROConfig = true
 	%title = Aestus
 	%manufacturer = EADS Astrium
@@ -494,6 +498,7 @@
 }
 @PART[liquidEngineconstelacion]:FOR[RealismOverhaul]:NEEDS[!RftS,!RealFuels_StockEngines]
 {
+	%yearIntroduced = 2014
 	%RSSROConfig = true
 	%title = J-2X
 	%manufacturer = Rocketdyne
@@ -622,6 +627,7 @@
 }
 @PART[liquidEnginemogulmp1500]:FOR[RealismOverhaul]:NEEDS[!RftS,!RealFuels_StockEngines]
 {
+	%yearIntroduced = 1985
 	%RSSROConfig = true
 	%title = RD-170
 	%manufacturer = NPO Energomash
@@ -750,6 +756,7 @@
 }
 @PART[liquidEngineorbit2]:FOR[RealismOverhaul]:NEEDS[!RftS,!RealFuels_StockEngines]
 {
+	%yearIntroduced = 1963
 	%RSSROConfig = true
 	%title = LR-91
 	%manufacturer = Aerojet
@@ -878,6 +885,7 @@
 }
 @PART[liquidEngineprodulVR2]:FOR[RealismOverhaul]:NEEDS[!RftS,!RealFuels_StockEngines]
 {
+	%yearIntroduced = 1963
 	%RSSROConfig = true
 	%title = LR-87 (two)
 	%manufacturer = Aerojet
@@ -1006,6 +1014,7 @@
 }
 @PART[microEngineex1sat]:FOR[RealismOverhaul]:NEEDS[!RftS,!RealFuels_StockEngines]
 {
+	%yearIntroduced = 1968
 	%RSSROConfig = true
 	%title = 0.5kN Thruster
 	%manufacturer = EADS Astrium
@@ -1117,6 +1126,7 @@
 }
 @PART[microEngineSE1]:FOR[RealismOverhaul]:NEEDS[!RftS,!RealFuels_StockEngines]
 {
+	%yearIntroduced = 1968
 	%RSSROConfig = true
 	%title = LM Ascent Engine
 	%manufacturer = TRW
@@ -1236,6 +1246,7 @@
 }
 @PART[VR1vulcan]:FOR[RealismOverhaul]:NEEDS[!RftS,!RealFuels_StockEngines]
 {
+	%yearIntroduced = 2001
 	%RSSROConfig = true
 	%title = RS-68A
 	%manufacturer = Rocketdyne
diff --git a/RealismOverhaul/RO_KW_RealEngines.cfg b/RealismOverhaul/RO_KW_RealEngines.cfg
index b92a9a7b8f..16f271ae85 100644
--- a/RealismOverhaul/RO_KW_RealEngines.cfg
+++ b/RealismOverhaul/RO_KW_RealEngines.cfg
@@ -1,5 +1,6 @@
 @PART[KW1mengineMaverick1D]:FOR[RealismOverhaul]:NEEDS[!RftS,!RealFuels_StockEngines]
 {
+	%yearIntroduced = 1962
 	%RSSROConfig = true
 	!MODULE[TweakScale]
 	{
@@ -131,6 +132,7 @@
 }
 @PART[KW1mengineVestaVR1]:FOR[RealismOverhaul]:NEEDS[!RftS,!RealFuels_StockEngines]
 {
+	%yearIntroduced = 1982
 	%RSSROConfig = true
 	!MODULE[TweakScale]
 	{
@@ -262,6 +264,7 @@
 }
 @PART[KW1mengineWildCatV]:FOR[RealismOverhaul]:NEEDS[!RftS,!RealFuels_StockEngines]
 {
+	%yearIntroduced = 1963
 	%RSSROConfig = true
 	!MODULE[TweakScale]
 	{
@@ -393,6 +396,7 @@
 }
 @PART[KW2mengineGriffonG8D]:FOR[RealismOverhaul]:NEEDS[!RftS,!RealFuels_StockEngines]
 {
+	%yearIntroduced = 1959
 	%RSSROConfig = true
 	!MODULE[TweakScale]
 	{
@@ -524,6 +528,7 @@
 }
 @PART[KW2mengineMaverickV]:FOR[RealismOverhaul]:NEEDS[!RftS,!RealFuels_StockEngines]
 {
+	%yearIntroduced = 1989
 	%RSSROConfig = true
 	!MODULE[TweakScale]
 	{
@@ -647,6 +652,7 @@
 }
 @PART[KW2mengineSPS]:FOR[RealismOverhaul]:NEEDS[!RftS,!RealFuels_StockEngines]
 {
+	%yearIntroduced = 1968
 	%RSSROConfig = true
 	!MODULE[TweakScale]
 	{
@@ -778,6 +784,7 @@
 }
 @PART[KW2mengineVestaVR9D]:FOR[RealismOverhaul]:NEEDS[!RftS,!RealFuels_StockEngines]
 {
+	%yearIntroduced = 1992
 	%RSSROConfig = true
 	!MODULE[TweakScale]
 	{
@@ -909,6 +916,7 @@
 }
 @PART[KW3mengineGriffonXX]:FOR[RealismOverhaul]:NEEDS[!RftS,!RealFuels_StockEngines]
 {
+	%yearIntroduced = 1967
 	%RSSROConfig = true
 	!MODULE[TweakScale]
 	{
@@ -1040,6 +1048,7 @@
 }
 @PART[KW3mengineTitanT1]:FOR[RealismOverhaul]:NEEDS[!RftS,!RealFuels_StockEngines]
 {
+	%yearIntroduced = 2005
 	%RSSROConfig = true
 	!MODULE[TweakScale]
 	{
@@ -1171,6 +1180,7 @@
 }
 @PART[KW3mengineWildcarXR]:FOR[RealismOverhaul]:NEEDS[!RftS,!RealFuels_StockEngines]
 {
+	%yearIntroduced = 1983
 	%RSSROConfig = true
 	!MODULE[TweakScale]
 	{