Timing Marks for '87 305 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

phattailrider · 05-31-2010, 11:51 PM

Two questions here actually ...
I was trying to locate the timing marker plate on my 305
and all i could find was a raised line about two inches long
that seems to be part of the engine block casting.

But there is no obvious marks or a plate that would give
me an indication of how many degrees off TDC i might be.

I put a timing light on it but the marks on the harmonic balancer
wheel didn't match up to the mark on the engine block.

I seriously doubt the timing is that far off TDC if in fact the line
on the block is the TDC Timing Marker Indicator.

Am i missing the Timing Plate ?

Also ... I was unable to locate the TAN w- Black Striped wire that
i need to disconnect to time it correctly.
Not sure i am looking in the correct place for it.

Thanks !
Phattailrider

Turbo85GMC · 06-01-2010, 07:15 AM

The timing tab on my '85 is behind the water pump. You have to practically crawl on top of the engine to see it.

phattailrider · 06-04-2010, 03:43 AM

The Timing Mark Plate is INDEED located behind the
water pump on my '87 305 ...

Good Gawd !
Didn't they take into account how HOT that area is !!!!

Thanks Turbo85GMC for the clue !

79gmcc15 · 06-04-2010, 04:45 AM

not to mention the fan

05-31-2010, 11:51 PM	#1
phattailrider Registered User Join Date: May 2010 Location: Bellevue, Washington Posts: 9	Timing Marks for '87 305 Two questions here actually ... I was trying to locate the timing marker plate on my 305 and all i could find was a raised line about two inches long that seems to be part of the engine block casting. But there is no obvious marks or a plate that would give me an indication of how many degrees off TDC i might be. I put a timing light on it but the marks on the harmonic balancer wheel didn't match up to the mark on the engine block. I seriously doubt the timing is that far off TDC if in fact the line on the block is the TDC Timing Marker Indicator. Am i missing the Timing Plate ? Also ... I was unable to locate the TAN w- Black Striped wire that i need to disconnect to time it correctly. Not sure i am looking in the correct place for it. Thanks ! Phattailrider

06-01-2010, 07:15 AM	#2
Turbo85GMC Registered User Join Date: Apr 2005 Location: Medford, MA Posts: 307	Re: Timing Marks for '87 305 The timing tab on my '85 is behind the water pump. You have to practically crawl on top of the engine to see it. __________________ '85 GMC 1500 "Friends don't let friends drive stock!"

06-04-2010, 03:43 AM	#3
phattailrider Registered User Join Date: May 2010 Location: Bellevue, Washington Posts: 9	Re: Timing Marks for '87 305 The Timing Mark Plate is INDEED located behind the water pump on my '87 305 ... Good Gawd ! Didn't they take into account how HOT that area is !!!! Thanks Turbo85GMC for the clue !

06-04-2010, 04:45 AM	#4
79gmcc15 Gettin It One Pice At A Time Join Date: Oct 2004 Location: everett, washington Posts: 2,688	Re: Timing Marks for '87 305 not to mention the fan __________________ RIP ELJAY Work In Progress 1979 GMC C1500 Trailering Special. Getting the truck done, one piece at a time. “You can tell a lot about a fellow’s character by his way of eating jellybeans.”Ronald Reagan “I don’t know the key to success but I know the key to failure is trying to please everybody.” Bill Cosby



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