460 70's timing chain replacement
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460 70's timing chain replacement
I read here that changing the late model 460 timing chain and gears to the early model 70's set up would increase HP.
My question is, I live in California, would it pass California smog inspection and if it does would it benefit a motorhome?
Notice I didn't ask if it was legal, only if it would pass a California emissions test.
My question is, I live in California, would it pass California smog inspection and if it does would it benefit a motorhome?
Notice I didn't ask if it was legal, only if it would pass a California emissions test.
Post Fiend
Joined: Dec 2006
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From: Lexington Mo
IF you're chain and gears have some wear to them then yes it could benifit you. Far as emissions, I don't think that would have anyhting to do with emissions at all. Andno the job really isn't too bad to do.
Bob
Bob
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Originally Posted by Nighteyez
You will definitely notice a difference with the timing gears installed straight up. You did not say what year your truck is, but it should pass emissions.
By "timing gears installed straight up" do you mean I can set my existing (1987) timing gears straight up?
Postmaster
Joined: Apr 2002
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From: Coal country
The term "straight up" refers to the degrees of timing the cam is offset from the crankshaft.
In '71 or thereabouts, Ford retarded the cam timing to reduce certain emissions. They did this by relocating the key slot 4 degrees over - so no, you can't just move the gear over.
You will need to get one with the key slots cut for 0 degrees change (like the ones in '70 and earlier) and your camshaft timing will be correct, restoring a good amount of power and mileage.
In '71 or thereabouts, Ford retarded the cam timing to reduce certain emissions. They did this by relocating the key slot 4 degrees over - so no, you can't just move the gear over.
You will need to get one with the key slots cut for 0 degrees change (like the ones in '70 and earlier) and your camshaft timing will be correct, restoring a good amount of power and mileage.
FTE Chapter Leader
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From: Fresno, CA.
My bad, I forgot too mention the early timing gears were "keyed" for being straight up instead of 4 degrees retarded. Your current timing sprocket does not have the cam key in the correct place. So you would need to purchase a 1970 or earlier 460 timing gear set in order to get the correct key alignment.
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Joined: Jun 2006
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From: north west pennsylvania
i just put mine straight up the other night. took it for a few mile ride last night and can verify it definately does not hurt the performance! its not a very in-depth evaluation or comparison but my initial impression is that it does make a difference. i would say you will not feel bad about spending the money for the timing set. im looking forward to towing something now!
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