All 4AGE engines contain the similar exhaust port situation and only the 20v engine contains a variance with the mounting facial area. That difference staying that to the 20v The 2 outer holes are location further more outwards that its 16V equivalent. Together with the 20v engines commonly gaining popularity https://4ageenginesale58147.isblog.net/everything-about-4age-engine-for-sale-48609276