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Discussion Starter #1 (Edited)
I'm interested in peoples experience with cam timing on the 460. I bought a Summit 3501 camshaft and fitted it into my first, 1971, 460 engine in my 1969 Cougar. Ran terribly at straight up 0 degrees with a Cloyes 9 key timing set. Took timing cover off, removed timing set and checked position by fitting old, stock, timing set (early straight up) and it went straight on without turning crank/cam. Fitted the Cloyes 9 key at position A8 by turning the crank slightly and upon completion the car was tested and it went very well.
I then read an article on the FordMuscle website concerning a 460 with a Comp Xe274 cam running poorly. Again, straight up conspired to be 113 degrees ICL and it was advanced by 8 degrees via the timing set to get to 105 degrees (target was 106). Ran much better.
I am currently running my 264/268 @0.050 cam at 4 degrees advanced and feel it could happily go the extra 4 degrees advanced.
I have a DTI gauge at hand and am going to play around on my spare short engine with a degree wheel fitted to check my next camshaft.
Why do cam manufacturers advertise about cam advance being "ground in" when you need to advance them? Are other engines the same?
 

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What is your actual static c/r?

Early pistons or builder replacements?

Advance is ground into the cam to mitigate too much cam duration chosen by many buyers.

Single pattern cams like the summit cam tend to work better when advanced

When running a cam like the XE274H I run no less than 10 to 1 static c/r. At 9 to 1 the bottom end is soft as hell.



SJ
used 2b RHP
 

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Discussion Starter #3 (Edited)
The 460 I had in the car until last year was a completely stock 1971 engine with a D1VE block and D0VE heads, single springs, rail rockers. Just the summit cam and cloyes timing set were fitted. It made 260hp at the wheels and 390lbs/ft at the wheels. I think that year is 10:1-10.5:1

The engine fitted now is a 521, D9TE block external balance, Scat 4.3 stroke crank, flat top probe pistons 4.39 bore (SCJ and stock inlet valve cutouts) Procomp heads measured with 91cc chambers. According to the Probe compression info page compression would be 10.24:1 with a 100cc chamber.

I am thinking of putting in a 274XE in my 521 because of my weak heads, manifolds etc. Hopefully still make 500hp.

I have another 1973 429 engine with dished pistons and yet another D1VE block. I may order a 545 stroker kit with the correct pistons to suit my P51 heads and have another short block assembled here for the future.
 

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The 460 I had in the car until last year was a completely stock 1971 engine with a D1VE block and D0VE heads, single springs, rail rockers. Just the summit cam and cloyes timing set were fitted. It made 260hp at the wheels and 390lbs/ft at the wheels. I think that year is 10:1-10.5:1

The engine fitted now is a 521, D9TE block external balance, Scat 4.3 stroke crank, flat top probe pistons 4.39 bore (SCJ and stock inlet valve cutouts) Procomp heads measured with 91cc chambers. According to the Probe compression info page compression would be 10.24:1 with a 100cc chamber.

I am thinking of putting in a 274XE in my 521 because of my weak heads, manifolds etc. Hopefully still make 500hp.

I have another 1973 429 engine with dished pistons and yet another D1VE block. I may order a 545 stroker kit with the correct pistons to suit my P51 heads and have another short block assembled here for the future.

I know what the static c/r is for a 1971 460.

What I was getting at is did you verify that that the engine has the original 11 cc dished pistons or was it at some time rebuilt?

Cranking PSI test?




SJ
 

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Discussion Starter #5
I didn't measure cranking compression unfortunately. I can't believe it was rebuilt ever because I took the heads off and it has 4.36 inch bores. There is a slight lip on the top of all the bores. Rust is a problem in this climate and almost certainly a Lincoln succumbed and gave up its engine at some point. The dish in the pistons looks like the dish in my 1973 429 pistons, another engine I bought thinking it was a 460 but then measured the stroke! I'd wager they're both as Ford built them in Lima engine plant.
 
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