Hope this helps.
It is an image from page 40 of the 2011 book Эксмо - Як-3. Истребитель Победа by N. Yakubovich.
It has a caption that roughly translates: " View of the power plant from above with the hood of the Yak-3 VK-107A removed with screws AV-10p-20 and VISH-YU7LO, issue head No. 115, which passed state tests from February 7 to May 15, 1944: a - the casing of the internal exhaust manifolds; b - the air outlet cooling the internal exhaust manifolds; c - a pipe supplying air for blowing internal candles"
Hope it is what you need.
Regards
Daniele