after having a recon merc 4.3 v6 engine i notice one riser is warm & the other is cold, is this normal. the engine was running for 30 mins.<br />the manifolds & risers are new. also noticed small<br />amount of steam from the exhaust area<br />thanx. ![Confused :confused: :confused:](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)