351W dizzy gear
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Mountain Pass
Joined: May 2015
Posts: 218
Likes: 82
From: White Mountain Lake, Az
351W dizzy gear
I'm using a Howards Cams 220235-12 roller cam in my 351W roller block. I'll be using a stock Duraspark dizzy. Is it necessary to change the stock dizzy gear to some alloy gear?
Cargo Master
Joined: Oct 2020
Posts: 2,698
Likes: 794
Looking at the picture on like it is tough to tell but it all depends on what core Howard's used to grind the cam. If its a SADI core then you should use a stock cast iron gear. If it is a steel core you'll have to use a bronze, a steel or a melonized gear for compatibility.
A SADI core is cast iron other cores are steel and can be carburized (copper plated barrel) or induction hardened(barrel will be un plated) and can look black or just a steel color.
A SADI core is cast iron other cores are steel and can be carburized (copper plated barrel) or induction hardened(barrel will be un plated) and can look black or just a steel color.
Mountain Pass
Joined: Feb 2017
Posts: 184
Likes: 60
From: Kentucky
I used a stock gear on a custom SADI camshaft and still had my gears eat each other. Two things that I learned from that were to ensure that the end play on your distributor is within specs, and put a 1/32" hole in the oil galley plug which is directly behind the distributor gear. My second custom cam, I ordered billet and a steel gear, due to the issues with manufacturers were having with SADI cores, and I took care of the end play and the oiling issue. This cam has lasted almost 3 years and appears to be wearing fine, but I can't tell you if it is the billet core, the other fixes; or a combination of the two that is keeping it alive.
Thread Starter
|
Mountain Pass
Joined: May 2015
Posts: 218
Likes: 82
From: White Mountain Lake, Az
Looking at the picture on like it is tough to tell but it all depends on what core Howard's used to grind the cam. If its a SADI core then you should use a stock cast iron gear. If it is a steel core you'll have to use a bronze, a steel or a melonized gear for compatibility.
A SADI core is cast iron other cores are steel and can be carburized (copper plated barrel) or induction hardened(barrel will be un plated) and can look black or just a steel color.
A SADI core is cast iron other cores are steel and can be carburized (copper plated barrel) or induction hardened(barrel will be un plated) and can look black or just a steel color.
Thread Starter
|
Mountain Pass
Joined: May 2015
Posts: 218
Likes: 82
From: White Mountain Lake, Az
I used a stock gear on a custom SADI camshaft and still had my gears eat each other. Two things that I learned from that were to ensure that the end play on your distributor is within specs, and put a 1/32" hole in the oil galley plug which is directly behind the distributor gear. My second custom cam, I ordered billet and a steel gear, due to the issues with manufacturers were having with SADI cores, and I took care of the end play and the oiling issue. This cam has lasted almost 3 years and appears to be wearing fine, but I can't tell you if it is the billet core, the other fixes; or a combination of the two that is keeping it alive.
Cargo Master
Joined: Oct 2020
Posts: 2,698
Likes: 794
I can't think of a SADI that I've had a gear problem with in a Ford but anything is certainly possible. The biggest problem I've seen with the SADI cores has been in small block Chevy engines where it would wear the fuel pump lobe. I've fixed that by regrinding it then they switched to a bronze tipped rod. So far, so good.
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