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1989 F350 460 Small cam, long tube headers, Holley Terminator X MPFI
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5 Posts
Discussion Starter #1 (Edited)
Hello everyone, I'm new to the forum and I'm sorry I'm sure this has been asked before. I just installed a cam in my EFI 460 and I think that it is running lean, I'm still running the Speed Density but I have the Holley Terminator X EFI kit to go on it, but I'm waiting for the TFI adapter to get delivered. The issue, I developed an intermittent lifter tick after After changing the break-in oil and filter (no metal contamination). I took the intake back off and checked all the lifters to see if I could tell witch one was the issue but no luck (I put them back where they came from) I was told to put a few miles on it to see if it clears up and it has gotten better but it backfires under heavy and wot over 2500 rpm, I just want to make sure that it is a fueling issue and not something I did with the cam install. I removed 3 plugs before the rain stopped me and from what I can tell two are lean and one very rich ( possible leaking/bad injector), does that sound right to y'all?

This 460 is my introduction to engine building, I have been getting a ton of great help on the 460 Facebook page but figured being on here couldn't hurt.

This engine is in my 89 CCLWB 4.10 5 speed dually and is used for towing.
I knew going in that the SD might not work with this cam, I also know that the Holley kit is over kill for this engine but will support my future plans when I'm not towing with this truck anymore.

I Forgot to add some info
New timing chain 4* adjustable set straight up.
Timing sprout out: 14*
Fuel pressure: [email protected] [email protected]

Summit Racing Part Number:SUM-3500
Cam Style:Hydraulic flat tappet
Basic Operating RPM Range:1,200-5,000
Intake Duration at 050 inch Lift:204
Exhaust Duration at 050 inch Lift:214
Duration at 050 inch Lift:204 int./214 exh.
Advertised Intake Duration:282
Advertised Exhaust Duration:292
Advertised Duration:282 int./292 exh.
Intake Valve Lift with Factory Rocker Arm Ratio:0.486 in.
Exhaust Valve Lift with Factory Rocker Arm Ratio:0.512 in.
Valve Lift with Factory Rocker Arm Ratio:0.486 int./0.512 exh.

91482
 

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Premium Member
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9,072 Posts
Which cam grind?
Did you install an adjustable FPR?

What is your running fuel pressure checked at WOT?


Initial timing with spout disconnected??? OEM is 10 degrees. 13 to 14 works better.




SJ
used 2b RHP


 

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Registered
1989 F350 460 Small cam, long tube headers, Holley Terminator X MPFI
Joined
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5 Posts
Discussion Starter #3
This cam
Summit Racing Part Number:SUM-3500

UPC:190861036161
Cam Style:Hydraulic flat tappet
Basic Operating RPM Range:1,200-5,000
Intake Duration at 050 inch Lift:204
Exhaust Duration at 050 inch Lift:214
Duration at 050 inch Lift:204 int./214 exh.
Advertised Intake Duration:282
Advertised Exhaust Duration:292
Advertised Duration:282 int./292 exh.
Intake Valve Lift with Factory Rocker Arm Ratio:0.486 in.
Exhaust Valve Lift with Factory Rocker Arm Ratio:0.512 in.
Valve Lift with Factory Rocker Arm Ratio:0.486 int./0.512 exh.

I didn't add an adjustable FPR but at WOT I have 55LBS of fuel pressure 42 @idle I actually have an upgraded high pressure pump. 100PSI 85GPH if I remember correctly.

Timing with spout disconnected is 14*

Sorry for the missing info.
 
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