1) Lakshmi narasimhar - Narasingapuram 

2) Kamkshi Sametha Sooleeswarar - Perambakkam

3) Thirupurasundari Sametha Thripurandhakar - Coovam

4) Pushpakujamba  sametha Singeeswarar - Maipedu

1) Lakshmi narasimhar - Narasingapura:

Abimanasthalam. Narasimhar is in laughing (punmuruval) posture which is very rare. Hence Lakshmi seeing the devotees instead of Narasimhar is very special in this temple. 

2) Kamkshi Sametha Sooleeswarar - Perambakkam

People visit here for Nerves system related cure. Special pooja on Mondays - lot of people come here for praying the lord and get vibuthi prasadam and Vilva podi.

3) Thirupurasundari Sametha Thripurandhakar - Coovam

Theenda Thirumeni - One of the 5 temples around this place which is not touched by anyone including Gurukal.

4) Pushpakujamba  sametha Singeeswarar - Maipedu

Hanuman on his way in search of Seetha visited this temple and prayed this shiva. due to scarcity of rain in this area, he played "Amrithavarshini" in his veena and got rain. Hanuman is seen with a veena in his hand. out of 27 nakthara temple, this is for "Moola Nakshtharam".

for further details:

https://en.wikipedia.org/wiki/Lakshmi_Narasimhar_Temple,_Narasinghapuram

http://temple.dinamalar.com/en/new_en.php?id=124