diff --git a/sim/regression-wally b/sim/regression-wally
index 6e7ccf388..1569abd77 100755
--- a/sim/regression-wally
+++ b/sim/regression-wally
@@ -136,11 +136,9 @@ tests64gc = ["arch64f", "arch64d", "arch64f_fma", "arch64d_fma", "arch64i", "arc
              "arch64priv", "arch64c",  "arch64m", "arch64zi", "wally64a", "wally64periph", "wally64priv"] 
 if (coverage):  # delete all but 64gc tests when running coverage
     configs = []
-#    tests64gc = ["coverage64gc", "arch64f", "arch64d", "arch64i", "arch64priv", "arch64c",  "arch64m", 
     tests64gc = ["coverage64gc", "arch64i", "arch64priv", "arch64c",  "arch64m", 
                  "arch64zi", "wally64a", "wally64periph", "wally64priv", 
-                 "arch64zba",  "arch64zbb",  "arch64zbc",  "arch64zbs", 
-                 "imperas64f", "imperas64d", "imperas64c", "imperas64i"] 
+                 "arch64zba",  "arch64zbb",  "arch64zbc",  "arch64zbs"]
     if (fp):
        tests64gc.append("arch64f")
        tests64gc.append("arch64d")
diff --git a/tests/riscof/sail_cSim/riscof_sail_cSim.py b/tests/riscof/sail_cSim/riscof_sail_cSim.py
index b34425f72..972b838e1 100644
--- a/tests/riscof/sail_cSim/riscof_sail_cSim.py
+++ b/tests/riscof/sail_cSim/riscof_sail_cSim.py
@@ -130,4 +130,5 @@ class sail_cSim(pluginTemplate):
             make.add_target(execute)
 #        make.execute_all(self.work_dir)
 # DH 7/26/22 increase timeout so sim will finish on slow machines
-        make.execute_all(self.work_dir, timeout = 1800)
+# DH 5/17/23 increase timeout to 3600 seconds
+        make.execute_all(self.work_dir, timeout = 3600)
diff --git a/tests/riscof/spike/riscof_spike.py b/tests/riscof/spike/riscof_spike.py
index 67c88b6ab..4a5b68b96 100644
--- a/tests/riscof/spike/riscof_spike.py
+++ b/tests/riscof/spike/riscof_spike.py
@@ -191,7 +191,8 @@ class spike(pluginTemplate):
       # parallel using the make command set above.
       #make.execute_all(self.work_dir)
       # DH 7/26/22 increase timeout to 1800 seconds so sim will finish on slow machines
-      make.execute_all(self.work_dir, timeout = 1800) 
+      # DH 5/17/23 increase timeout to 3600 seconds
+      make.execute_all(self.work_dir, timeout = 3600) 
 
 
       # if target runs are not required then we simply exit as this point after running all