460 Help please. New to this. - Page 2 - Ford Muscle Forums : Ford Muscle Cars Tech Forum
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post #16 of 25 (permalink) Old 04-07-2016, 10:48 AM
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Re: 460 Help please. New to this.

Other issues piston to deck height is either .010 from 68 to 70,
.020 70 1/2, .032 in 72. So how could .060 be milled from the deck?
Might be a good idea to look at the block casing # and date code above the starter it might not be the proper block for the year of the car. Not sure what piston to deck is on newer blocks.
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post #17 of 25 (permalink) Old 04-07-2016, 10:56 AM
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Re: 460 Help please. New to this.

I agree, the OP should do a compression test to see what may be wrong internally.
It would be a tough pill to swallow to buy aluminum heads, only to find out that the rings are shot.

If the compression test comes back okay, I would start looking at carburetor, ignition, and timing to see what may be wrong.
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post #18 of 25 (permalink) Old 04-07-2016, 11:50 AM Thread Starter
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Re: 460 Help please. New to this.

if the d3's didn't show up until '73 then why would someone put them on a 71?


i'm thinking about taking the heads off and doing a DIY port and polish. I also just want to take stuff apart and try to learn more about what I have, and see how stuff comes apart, and goes together.

Main problem with that is I cannot find any torque specs anywhere on these. Also I wouldn't know exactly how to measure the combustion volume, nor the dish/dome of the piston.
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post #19 of 25 (permalink) Old 04-07-2016, 12:18 PM
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Re: 460 Help please. New to this.

oNE OF MY GUESSES is its a newer block like my 86 maybe as the 71 engine was toast. Newer blocks piston to deck is listed as .186 below.
So decking it .060 would be possible so would taking .030 off the heads. doing both would raise the compression. How much would depend on flat top pistons or reverse dome. The decking and head milling would reduce the amount of lift the cam could have. Remember a guy had about a 71 still stock had valves just barely touching the pistons (the flat tops) wit h.525 lift intake.
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post #20 of 25 (permalink) Old 04-07-2016, 12:43 PM
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Re: 460 Help please. New to this.

ok- this is 100% my opinion, so take it as such.

DIY port-and-polish isn't the best place to start learning about motors. You run the risk of ruining your heads.

If you want to take something apart (which is very educational), get a junkyard engine, or some ruined piece off Craigslist.
Right now, you have a running car- I'd keep it that way as long as possible, and learn on something else.

This is how you measure the combustion volume of a cylinder head.
You can do the same thing with the piston dish.
post #21 of 25 (permalink) Old 04-07-2016, 02:01 PM Thread Starter
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Re: 460 Help please. New to this.

Quote:
Originally Posted by turbo2256b View Post
Other issues piston to deck height is either .010 from 68 to 70,
.020 70 1/2, .032 in 72. So how could .060 be milled from the deck?
Might be a good idea to look at the block casing # and date code above the starter it might not be the proper block for the year of the car. Not sure what piston to deck is on newer blocks.
what am I looking for exactly? when I get home I'll check the numbers and see what I can find. Maybe someone might know what these numbers mean.
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post #22 of 25 (permalink) Old 04-08-2016, 11:09 AM
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Re: 460 Help please. New to this.

I think I've lost track on what you're trying to accomplish.

You have a poor-running 460, and your goal is to end up with a car that you can put on a dragstrip.
Do you want to identify/fix the current issue, or just tear it down and set it up for the strip?

i would definitely recommend against spending $3500 on intake/heads/cam before you know whether anything is wrong with the bottom end.
and honestly, if you're shooting for a drag car, you need to just tear it down and start from scratch anyway.
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post #23 of 25 (permalink) Old 04-10-2016, 04:15 AM
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Re: 460 Help please. New to this.

How old are the valve springs? Weak valve springs will often be lazy above4000rpm .
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post #24 of 25 (permalink) Old 04-14-2016, 04:52 PM
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Re: 460 Help please. New to this.

Quote:
Originally Posted by cuthrell View Post
I think I've lost track on what you're trying to accomplish.

You have a poor-running 460, and your goal is to end up with a car that you can put on a dragstrip.
Do you want to identify/fix the current issue, or just tear it down and set it up for the strip?

i would definitely recommend against spending $3500 on intake/heads/cam before you know whether anything is wrong with the bottom end.
and honestly, if you're shooting for a drag car, you need to just tear it down and start from scratch anyway.
This Focus on evaluating what you have first. Is the short block healthy? Do a compression test. If that is okay, focus on tuning the carb. Check the timing. If all that is okay, then perhaps consider just running it on track for a baseline.

I would not spend money until I evaluated what I had.

1965 mustang coupe. 306, home ported 180cc heads, funnel web, 10:4 compression, t5z, 4.62 gears in a locker
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post #25 of 25 (permalink) Old 04-21-2016, 11:03 AM
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Re: 460 Help please. New to this.

Quote:
Originally Posted by JRDUNB01 View Post
if the d3's didn't show up until '73 then why would someone put them on a 71?

To lower the compression ratio to make the engine run on toady's pump gas. An original 71 engine would have used small chamber heads and had a compression ratio over 10.5:1. With a small factory cam they are detonation prone on today's pump gas.

D3's are large volume closed chamber heads. They typically have a chamber volume of around 97 cc's assuming they have not been cut. Installing them in place of the original small chamber (C8, C9, D0) heads makes the compression ratio a more manageable 9.5:1 or thereabouts.

Perhaps the .060" decking is in reference to the heads being cut and not the block? As someone else suggested, cc the chambers to see what you have.

There is nothing wrong with D3 heads and with proper port work have the same performance potential as the small chamber heads.
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