As exhaust valve is 3/4 of the way from closing, the intake valve starts to open??? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

pwrunt3pte · 09-20-2010, 06:55 PM

I replaced the head gasket on a generation IV 454. after i had it back together it wouldn't start. you could tell there was something wrong because the starter didn't have that usual sound to it like there was no compression. i noticed that when I cycled the engine around with a breaker bar that the intake valve would open, before the exhaust valve had closed all the way. Meaning that they were both open at the same time for a second. I didn't touch the cam, timing chain or gears when i replaced the head gasket. Is this a valve adjustment issue or is the cam miss aligned?

09-20-2010, 06:55 PM	#1
pwrunt3pte Registered User Join Date: Jul 2010 Location: jacksonville, florida Posts: 21	As exhaust valve is 3/4 of the way from closing, the intake valve starts to open??? I replaced the head gasket on a generation IV 454. after i had it back together it wouldn't start. you could tell there was something wrong because the starter didn't have that usual sound to it like there was no compression. i noticed that when I cycled the engine around with a breaker bar that the intake valve would open, before the exhaust valve had closed all the way. Meaning that they were both open at the same time for a second. I didn't touch the cam, timing chain or gears when i replaced the head gasket. Is this a valve adjustment issue or is the cam miss aligned?



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