Is the 460 an interference engine???
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Tuned
Joined: Oct 2020
Posts: 256
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From: San Jose, CA
Is the 460 an interference engine???
Hey guys, for some reason I can't seem to find a concrete yes or no on this question. I had a timing gear break off of the camshaft and I am wondering how extensive the damage is. I am obviously going to take the heads off and everything but I just want to know if anyone knows if the 460 is interference or not. It is an '88 EFI with E7TE heads.
I had the engine apart and it didn't look to me visually like the valves had the potential to make contact with the pistons but I really just don't know. Did not hear any evidence of contact and failure but the problem occurred while cranking not when the engine was running so I can't be sure.
Is the 460 an interference engine?
Thanks,
James
I had the engine apart and it didn't look to me visually like the valves had the potential to make contact with the pistons but I really just don't know. Did not hear any evidence of contact and failure but the problem occurred while cranking not when the engine was running so I can't be sure.
Is the 460 an interference engine?
Thanks,
James
Last edited by james_1988f250; Dec 7, 2021 at 12:03 PM. Reason: e7te heads note d3ve
Lead Driver
Joined: Feb 2002
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From: Greater Austin, Texas
Yes it is an interference engine. With that said it might be tough for the exhaust valves to hit with a stock cam but the intakes can hit.
I don't think this is correct. I've never seen any cam-in-block engine that was interference in stock form.
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Tuned
Joined: Oct 2020
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From: San Jose, CA
Cargo Master
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There are plenty of cam in block engines that are interference and if the timing chain breaks the valves will hit. Small block Ford, Small block Chevy, Cadillac 472. I'm just not sure about a 460 but I can't see why it wouldn't hit even with the stock cam which has .432 intake .475 exhaust lift. .432 lift at TDC would almost have to hit the piston with the stock valve relief.
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Tuned
Joined: Oct 2020
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From: San Jose, CA
Also another correction on the heads lol. I was just trying to remember the casting numbers from memory but I know for sure that they are E7TE heads, as it is an efi, and I looked at the casting numbers.
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Thread Starter
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Tuned
Joined: Oct 2020
Posts: 256
Likes: 30
From: San Jose, CA
There are plenty of cam in block engines that are interference and if the timing chain breaks the valves will hit. Small block Ford, Small block Chevy, Cadillac 472. I'm just not sure about a 460 but I can't see why it wouldn't hit even with the stock cam which has .432 intake .475 exhaust lift. .432 lift at TDC would almost have to hit the piston with the stock valve relief.
Lead Driver
Joined: Feb 2002
Posts: 7,970
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From: Greater Austin, Texas
There are plenty of cam in block engines that are interference and if the timing chain breaks the valves will hit. Small block Ford, Small block Chevy
This is just not correct. Back in the 70s, when GM and Ford were using nylon cam gears, it was VERY common for cars to come in the shop with the cam gear stripped. In those days, the SBC and the SBF (ie Windsor) were by far the most popular motors. We put new timing gears and chain on them and out the door they went. There was never any engine damage. Where are you getting this information, anyway? Nobody ever heard the term "interference fit" until OHC engines were commonplace.
See if you can find a cam-in-block engine in this list:
http://yourcarangel.com/2014/07/inte...complete-list/
Cargo Master
Joined: Oct 2020
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This is just not correct. Back in the 70s, when GM and Ford were using nylon cam gears, it was VERY common for cars to come in the shop with the cam gear stripped. In those days, the SBC and the SBF (ie Windsor) were by far the most popular motors. We put new timing gears and chain on them and out the door they went. There was never any engine damage. Where are you getting this information, anyway? Nobody ever heard the term "interference fit" until OHC engines were commonplace.
If it just got loose and jumped time it would probably retard which would be more forgiving most likely because the exhaust valve is so far up in the chamber but you never know. I've worked on engines where somebody used the crank key instead of the dot when they changed the timing chain. This is no problem on a Ford but on a lot of other engines it advances the cam 45 additional degrees. When this is done having the intake valves hit the pistons is very likely to happen.
Thread Starter
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Tuned
Joined: Oct 2020
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From: San Jose, CA
The thing is the timing didn't slip it literally just is broken off. The crank and cam were not connected at all. If there was any valve damage it would only be on a couple of valves.
Thread Starter
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Tuned
Joined: Oct 2020
Posts: 256
Likes: 30
From: San Jose, CA
This is just not correct. Back in the 70s, when GM and Ford were using nylon cam gears, it was VERY common for cars to come in the shop with the cam gear stripped. In those days, the SBC and the SBF (ie Windsor) were by far the most popular motors. We put new timing gears and chain on them and out the door they went. There was never any engine damage. Where are you getting this information, anyway? Nobody ever heard the term "interference fit" until OHC engines were commonplace.
See if you can find a cam-in-block engine in this list:
Interference Engines - The Complete List
See if you can find a cam-in-block engine in this list:
Interference Engines - The Complete List
Cargo Master
Joined: Oct 2020
Posts: 2,699
Likes: 797
This is just not correct. Back in the 70s, when GM and Ford were using nylon cam gears, it was VERY common for cars to come in the shop with the cam gear stripped. In those days, the SBC and the SBF (ie Windsor) were by far the most popular motors. We put new timing gears and chain on them and out the door they went. There was never any engine damage. Where are you getting this information, anyway? Nobody ever heard the term "interference fit" until OHC engines were commonplace.
See if you can find a cam-in-block engine in this list:
Interference Engines - The Complete List
See if you can find a cam-in-block engine in this list:
Interference Engines - The Complete List
I don't know if a stock 460 will hit because I can't think of one 460 that I ever had come in with a timing chain problem but it seems very likely.