Comp cam XE262H in 460 - 460 Ford Forum
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post #1 of 26 (permalink) Old 04-17-2017, 11:08 AM Thread Starter
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Comp cam XE262H in 460

So I picked up a fresh rebuilt 460 it was sitting for a couple years and this weekend I fired it up. Started up no problem sat and idled with out even having to pump it or feather the throttle. I was told it has a RV cam in it and by the exhaust tone sounds pretty mild. Everything was redone on this engine even the heads I haven't pulled the manifolds off to see if the hump was ground out yet. It has D3 heads on it. I have to pull the engine and while I have it out I was thinking about swapping the cam out to the comp XE262H before I put in my 66F100. My question will there be any issues installing this cam in a almost stock rebuild? I had a big build planned then money became a problem so I'm going this route until I get more money. I'm going to be running a C6 tranny headers RPM intake
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post #2 of 26 (permalink) Old 04-17-2017, 12:06 PM
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So I picked up a fresh rebuilt 460 it was sitting for a couple years and this weekend I fired it up. Started up no problem sat and idled with out even having to pump it or feather the throttle. I was told it has a RV cam in it and by the exhaust tone sounds pretty mild. Everything was redone on this engine even the heads I haven't pulled the manifolds off to see if the hump was ground out yet. It has D3 heads on it. I have to pull the engine and while I have it out I was thinking about swapping the cam out to the comp XE262H before I put in my 66F100. My question will there be any issues installing this cam in a almost stock rebuild? I had a big build planned then money became a problem so I'm going this route until I get more money. I'm going to be running a C6 tranny headers RPM intake
If the engine is an oem style rebuild the static c/r will be less than 8 to 1. Until such a time as you can raise the static c/r leave the cam as is.

Best bang for time and $$ spent is:

Straight up cam timing
Properly curved distributor


Save the RPM intake for later.




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post #3 of 26 (permalink) Old 04-17-2017, 08:02 PM Thread Starter
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Is there anyway of checking the compression ratio with the engine still together? I'm going to go through all the gaskets except the head gaskets maybe I can see if they put better pistons in it from the bottom when I take the pan off...by part # or something?
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post #4 of 26 (permalink) Old 04-17-2017, 09:00 PM
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Is there anyway of checking the compression ratio with the engine still together? I'm going to go through all the gaskets except the head gaskets maybe I can see if they put better pistons in it from the bottom when I take the pan off...by part # or something?

You can check cranking PSI as well as looking into the spark plug hole with a bore scope to ID pistons.



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post #5 of 26 (permalink) Old 04-17-2017, 09:43 PM Thread Starter
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Thanks for the info I will definitely do that.
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post #6 of 26 (permalink) Old 04-21-2017, 09:44 AM Thread Starter
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I got a cheap borescope off amazon and looked inside the pistons are flat with a oval out them on one side like a reverse dome piston. I'll try and post a picture
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post #7 of 26 (permalink) Old 04-21-2017, 09:53 AM Thread Starter
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They look just like this.
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post #8 of 26 (permalink) Old 04-21-2017, 09:54 AM Thread Starter
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Not really an oval I guess
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post #9 of 26 (permalink) Old 04-21-2017, 11:36 AM
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Typical sealed power H418cp builder piston.
Silvolite and caldwell look the same.




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post #10 of 26 (permalink) Old 04-21-2017, 08:21 PM Thread Starter
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So probably the 8.5 like you were saying unless they had the heads shaved the cylinder walls looked great looks like it doesn't have any miles on it.
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post #11 of 26 (permalink) Old 04-21-2017, 08:48 PM
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So probably the 8.5 like you were saying unless they had the heads shaved the cylinder walls looked great looks like it doesn't have any miles on it.
Unless the block has been decked and the heads decked the static c/r will be LESS than 8 to 1...



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post #12 of 26 (permalink) Old 04-22-2017, 06:44 AM
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A set of early C9, D0 heads with the smaller 75cc chambers would boost compression - or better yet some aftermarket aluminum heads (which would already have the screw-in-studs, valve springs, larger valves and better flow, hardened ex seats, better seals, etc.).

The bump in compression (to around 10.5?) would certainly improve performance - although 10.5 might be a little high for street use/pump gas.

*
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post #13 of 26 (permalink) Old 04-22-2017, 08:26 AM
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I got a cheap borescope off amazon and looked inside the pistons are flat with a oval out them on one side like a reverse dome piston. I'll try and post a picture
I might want to do this. What borescope did you buy and could you clearly see the top of the bore where the ridge develops? Would you buy a different scope now?
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post #14 of 26 (permalink) Old 04-22-2017, 12:25 PM
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A set of early C9, D0 heads with the smaller 75cc chambers would boost compression - or better yet some aftermarket aluminum heads (which would already have the screw-in-studs, valve springs, larger valves and better flow, hardened ex seats, better seals, etc.).

The bump in compression (to around 10.5?) would certainly improve performance - although 10.5 might be a little high for street use/pump gas.
In a later model oem style rebuild with 22 / 23 cc dished hyper pistons with 1.752 CH, no or minimal decking leaving pistons .035"+ down the bore and 75 cc chamber early heads or 74 cc chamber aluminum offerings will bring static c/r to about 9 to 1 with a .075"+ quench distance.

22 cc dished piston
72 cc chamber
pistons at ZERO deck height puts static c/r at 9.92 with the UEM calculator.



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post #15 of 26 (permalink) Old 04-22-2017, 02:13 PM
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Do those pistons OP has havea 22 or 23cc dish? The specs on the OP's pistons on say the dish is .240 deep. But they don't give a "cc" for the dish.

I have the TRW 2404F which have a .180 depression and that is a 22cc dish. But the TRWs have a round dish and the OPs have an oval dish.

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