Hi, posted this on s b f t e c h .com, but no answers:
I hope you guys can help me with spark plug selection. I rebuilt my engine, a '69 351W, a year ago, and I've been having trouble with dieseling and overheating and pinging ever since. Not a good combo, so I haven't driven much. Anyway, have been playing around with the ignition lately, and gotten it in the ball park, at least. So it starts pretty easily, but have some pinging when under load, such as accelerating up a hill. It can also diesel sometimes. So the next step for me is to go on to carburetor tuning (I know it's lean), but then I thought, it could all be a waste if the wrong plugs are in it.
Here are the engine specs:
* 1969 351W, overbored 0.030
* New Scat cast 3.500 crankshaft
* New Melling standard volume oil pump
* Moroso 9qt roadrace oil pan
* Original connection rods, ARP bolts
* Wiseco Pro Tru forged pistons
* Edelbrock Performer RPM heads, ported (60cc)
* Edelbrock Air-Gap manifold
* BG Speed Demon 750VE carb
* Speed Pro CS-1162R camshaft (Equalent of the Edelbrock Preformer RPM)
* Complete Crane ignition system, with optical/digital distributor
According to Wiseco, the pistons with 0.038 thick compressed head gaskets (like mine) and 0.010 deck height (I don't know what mine is), and a 60cc head, comp ratio should be 10.8:1.
http://www.wiseco.com/Catalogs/ProTru/FordOldsPontiac.pdf
I have been using NGK FR-5 spark plugs, but I'm not sure if they can handle the compression ratio. BTW, I'm Norway, and I use 98 RON octane gas, and it should be the same as your 93 PON octane.
Any input is welcome!
I hope you guys can help me with spark plug selection. I rebuilt my engine, a '69 351W, a year ago, and I've been having trouble with dieseling and overheating and pinging ever since. Not a good combo, so I haven't driven much. Anyway, have been playing around with the ignition lately, and gotten it in the ball park, at least. So it starts pretty easily, but have some pinging when under load, such as accelerating up a hill. It can also diesel sometimes. So the next step for me is to go on to carburetor tuning (I know it's lean), but then I thought, it could all be a waste if the wrong plugs are in it.
Here are the engine specs:
* 1969 351W, overbored 0.030
* New Scat cast 3.500 crankshaft
* New Melling standard volume oil pump
* Moroso 9qt roadrace oil pan
* Original connection rods, ARP bolts
* Wiseco Pro Tru forged pistons
* Edelbrock Performer RPM heads, ported (60cc)
* Edelbrock Air-Gap manifold
* BG Speed Demon 750VE carb
* Speed Pro CS-1162R camshaft (Equalent of the Edelbrock Preformer RPM)
* Complete Crane ignition system, with optical/digital distributor
According to Wiseco, the pistons with 0.038 thick compressed head gaskets (like mine) and 0.010 deck height (I don't know what mine is), and a 60cc head, comp ratio should be 10.8:1.
http://www.wiseco.com/Catalogs/ProTru/FordOldsPontiac.pdf
I have been using NGK FR-5 spark plugs, but I'm not sure if they can handle the compression ratio. BTW, I'm Norway, and I use 98 RON octane gas, and it should be the same as your 93 PON octane.
Any input is welcome!