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Old 01-31-2020, 05:13 PM   #21
rotorwrench
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Default Re: 8cm cam grind

The 1CM cam came about for the change over to the rotator type valves and the automatic transmission.
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Old 01-31-2020, 06:47 PM   #22
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Default Re: 8cm cam grind

That makes a lot of sense. The automatic transmission would seem to me to require a milder cam for a smoother idle to accommodate idling in gear when stopped. Maybe, maybe not.
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Old 01-31-2020, 07:03 PM   #23
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Default Re: 8cm cam grind

May I ask if there is a (best) stock cam for the pre 8ba style motors with the front mount dizzy?
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Old 01-31-2020, 08:41 PM   #24
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Default Re: 8cm cam grind

get the merc cam and cut the gear off mart, piece o cake for you
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Old 01-31-2020, 09:15 PM   #25
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Default Re: 8cm cam grind

Have the Merc cam ground on an early core.
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Old 01-31-2020, 09:35 PM   #26
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Default Re: 8cm cam grind

Quote:
Originally Posted by tubman View Post
Just out of curiosity, does anyone know if there are "1CM" ('51 Mercury) or "EAC" ('52-'53 Mercury) separate grinds?
I dug through my cam charts and found that I did degree a couple 1CM cams and for all practical purposed they are identical to the 8CM.
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Old 01-31-2020, 09:48 PM   #27
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Default Re: 8cm cam grind

May I ask if there is a (best) stock cam for the pre 8ba style motors with the front mount dizzy?



In my opinion, yes; the 32-34 steel cam. In 1935 with the introduction of the bigger, heavier bodies, along with cast iron camshafts, Ford 'detuned' the cam timing.
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Old 01-31-2020, 10:44 PM   #28
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Default Re: 8cm cam grind

Do you have some specs to compare the cams?
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Old 01-31-2020, 11:24 PM   #29
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Default Re: 8cm cam grind

Only some;
year engine valve lift inches intake opensBTC intake closesABC exhaust opens BBC exhaust closesATC
32-34 V8 85 .292" 9.5 * 54.5* 57.5* 6.5*
35-42 V8 85 .292" 0.0* 44.0* 48.0* 6.0*
46-49 V8 100 .292 0.0* 44.0* 48.0* 6.0*
[1949 intake increased to .296" lift]
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Last edited by Brian; 02-01-2020 at 12:48 AM.
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Old 02-01-2020, 12:14 AM   #30
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Default Re: 8cm cam grind

so my 34 motor that they left water in to freeze in not a boat anchor after all!
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Old 02-01-2020, 12:32 AM   #31
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Default Re: 8cm cam grind

8CM that I degreed when building the 260 Merc:


9* 53* 50* 7* (checked at .014/.015 lash)

.330 lift at 0 lash



Compares nicely to the 32-34 cam Brian posted above. I think it'd be nice with the front modified for the early engine. An EAB cam is also very close to these numbers when advanced 4 degrees.



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Old 02-01-2020, 06:07 PM   #32
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Default Re: 8cm cam grind

Quote:
Originally Posted by Brian View Post
Only some;
year engine valve lift inches intake opensBTC intake closesABC exhaust opens BBC exhaust closesATC
32-34 V8 85 .292" 9.5 * 54.5* 57.5* 6.5*
35-42 V8 85 .292" 0.0* 44.0* 48.0* 6.0*
46-49 V8 100 .292 0.0* 44.0* 48.0* 6.0*
[1949 intake increased to .296" lift]
Any ideas what lift these numbers were taken at?
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Old 02-01-2020, 06:11 PM   #33
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Default Re: 8cm cam grind

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Originally Posted by flatjack9 View Post
Any ideas what lift these numbers were taken at?
I thought somewhere I saw the EAC is .320" lift. I'm surprise the stock ones are less than .300". Seems like such little lift.
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Old 02-01-2020, 06:28 PM   #34
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Default Re: 8cm cam grind

Tim,
Those numbers do not jive with these.
https://www.tildentechnologies.com/C...rformance.html
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Old 02-01-2020, 10:51 PM   #35
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Default Re: 8cm cam grind

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I thought somewhere I saw the EAC is .320" lift. I'm surprise the stock ones are less than .300". Seems like such little lift.
According to Tilden, Ford took spec'd their cams at .015 lift.
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Old 02-01-2020, 10:58 PM   #36
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Default Re: 8cm cam grind

You can install an 8ba style cam in an early block and front cover. Then you can run a late style distributor. W do this all the time
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Old 02-01-2020, 11:03 PM   #37
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Default Re: 8cm cam grind

Quote:
Originally Posted by Tim Ayers View Post
I thought somewhere I saw the EAC is .320" lift. I'm surprise the stock ones are less than .300". Seems like such little lift.
I've never seen an EAC cam. I have cams marked EA and EAB. EAB had .307 lift and the EA had .330.
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Old 02-03-2020, 07:21 AM   #38
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Default Re: 8cm cam grind

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Originally Posted by flatjack9 View Post
I've never seen an EAC cam. I have cams marked EA and EAB. EAB had .307 lift and the EA had .330.
I’ll look again at the cam. The lift numbers were going off memeory so they may not be correct.
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