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Make sure there is vacuum to the fuel pressure regulator and that it is functioning properly. 33 idle with vac. 43 ish no vac.
Another possibility is the MAP sensor. Check vac line from manifold to the sensor.

Initial advance with SPOUT DISCONNECTED should be minimum of 10 and max of 14.




Scotty J. "AKA" The "Mad Porter"
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Time to do the chain and gears, actually with the retarded cams these have it was time for this little bit of rebuild from day 1!
The 88 to end of production EFI engines utilize a straight up double roller timing set.

Cam specs are essentially the same for passenger car and truck engines

193 / 206 @ .050"

113 LSA

110 ICL when straight up
118 ICL when retarded crank gear is used. 1972 to 1987 carb engines.





Scotty J. "AKA" The "Mad Porter"
"EMC 2006" 3rd place finisher
Ported BBF iron head specialist & Aluminum heads from all sources.
Custom ground cams
See our products in the Vendor for sale section
Customized crate engines
ParklandAutoMachine.com
R-H-P.biz
"Parkland Performance Auto Machine" Formerly RHP
(253)-988-6648
Parkland Auto Machine
 

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Delta is local and grinds all of our cams.
You would need to take the cam to delta and have it plotted on their Cam Dr. Performance trends analyzer.

There should be a part number on the back face of the rear journal.

Did you address the issues in my prior post?

Cam timing would need to stay short given the application.

What cam is currently in the engine? Proper straight up timing set like OEM?





Scotty J. "AKA" The "Mad Porter"
"EMC 2006" 3rd place finisher
Ported BBF iron head specialist & Aluminum heads from all sources.
Custom ground cams
See our products in the Vendor for sale section
Customized crate engines
ParklandAutoMachine.com
R-H-P.biz
"Parkland Performance Auto Machine" Formerly RHP
(253)-988-6648
Parkland Auto Machine
 

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10,066 Posts
Stock factory cam is in motor now. Not sure what "cam timing short" or "straight up" means. Was it still common after 1988 to have a retarded cam in a factory motor? I don't remember the year of the motor in the truck now, but it was from a much newer truck. Thanks for the info on the cam number and Delta.

As I noted in post #6 ALL EFI 460 engines used straight up / not retarded 8 degrees cam timing with an HD double roller timing set.

For a work engine short cam timing means keep duration smallish or short.





Scotty J. "AKA" The "Mad Porter"
"EMC 2006" 3rd place finisher
Ported BBF iron head specialist & Aluminum heads from all sources.
Custom ground cams
See our products in the Vendor for sale section
Customized crate engines
ParklandAutoMachine.com
R-H-P.biz
"Parkland Performance Auto Machine" Formerly RHP
(253)-988-6648
Parkland Auto Machine
 
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