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If your cam is 5150/5160 induction hardened steel or 8620 carburized billet, you might consider a melonized steel gear as an alternative. If you are using a high volume or high pressure oil pump, the bronze gear is very short on useful life.
When I put my GT40P in my 66 I read up on distributor gears as well as spoke to several company techs from MSD and Ford. I don’t believe the Melonized gear is compatible with the 8620 used on mechanical roller cams, the 8620 is too hard. I think you’re limited to the brass and possibly the composite. Not saying this is the case with Shaun but I think a couple problems in general are that people don’t verify the correct placement of the gear on the shaft. I bought a Melonized MSD gear and MSD supplies specific info on locating the gear as well as Ford Motorsport. I checked a couple of old Ford point distributors I had and non of them were close to being right. Oddly enough a Auto Zone Taiwan made Duraspark I bought for a 85 Mustang with roller cam was almost dead on. We should be checking gear mesh. I think another general fault is how many people just stab in a new distributor without putting a break in lube on the distributor gear?

SADI cams do not need a special gear. A standard cast iron gear is fine. A SADI cam is made of ductile iron and only the lobe surfaces are hardened and this can be done on the production line without changing the profile dimensions.
 

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Tom,

Thanks very much for calling out my numbskullness on 8620 billets. You are absolutely correct that steel gears and 8620 cams are a no-go. Bronze gears are the most reliable, but will require regular inspection and periodic replacement. I'll shut up now!
 

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That'll buff out! That is some serious destruction! Guess we'll have to buy more parts to fund the rebuild.
 

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....
 

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It was all going so well until it wasn't... Not a very dramatic ending to this motor but none the less, it appears toast.
Wow, that seemed like an unusual place for the engine to let go, out of the throttle and not high rpm's (if I'm hearing the video correctly).

Have you decided if it was a valve that let go or something else?

Allen
 

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Discussion Starter #410
Wow, that seemed like an unusual place for the engine to let go, out of the throttle and not high rpm's (if I'm hearing the video correctly).

Have you decided if it was a valve that let go or something else?

Allen
Speculation at this point because its not fully apart yet but its looking that way. Either valve head broke off and destroyed the piston or the valve got stuck in the guide and the piston smashed into it.

Should be out and at the shop tomorrow so I'll know in a few weeks how bad it is and what I'm in for $$$.
 

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Sorry for your loss, but those Ford crate engines are essentially street engines. I don't know who assembles the Ford heads, but I would be looking at what parts were used. PowerNation TV just built a 363 using a Dart block as an endurance engine for a road race team that should be able to withstand just about any abuse.


My air compressor just blew up and made more of a racket than that 363 when it let go.
 

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My air compressor just blew up and made more of a racket than that 363 when it let go.

Yeah, I'm bummed. I don't even have a KABLAMO video to share... According to those behind me apparently there was plenty of smoke!
 

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That really sucks...BUT....you DO have the $6 mill don't you?!
 

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I don't even have a KABLAMO video to share...

When my FRPP create dropped a valve it made no noise either.

The problem with mine was the friction welded valve that let go. What a mess...



Sent from my iPhone using Tapatalk
 

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Discussion Starter #415
When my FRPP create dropped a valve it made no noise either.

The problem with mine was the friction welded valve that let go. What a mess...



Sent from my iPhone using Tapatalk
More money and better components will fix it I'm sure! :wink:

Motor is going into the shop today and a new plan will be formed.
 

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Yeah, it's funny sometimes, I made a 3-piece crank out of my Formula Ford 1600cc, all I heard was a muted thump. No smoke, fire or anything, just went from 7k to dead silent !
 

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Discussion Starter #417
Dropped the motor off at Survival Motorsports today. On initial inspection Barry thinks a rod let go.

Most of the motor looks trashed unfortunately. The block may be salvageable with a sleeve, the crank may get saved, maybe one head. The rest is door stops and paperweights.









 
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