P-51 / cam

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P-51 / cam

Post  glenevans on May 8th 2013, 11:51 pm

Thinking of upgrading to P-51 heads and new flat top pistons for my 545. Would be close to 13.8 - 14 compression. Wondering if my current flat tappet cam .648 lift 262* duration @ .050 would work ok.

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Re: P-51 / cam

Post  bbf-falcon on May 9th 2013, 12:01 am

Are you estimating C/R? Suspect

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Re: P-51 / cam

Post  glenevans on May 9th 2013, 12:15 am

14.03 based on Wallace Racing calculator with 3cc piston (probe), zero deck, 72cc chamber. I had figured it a week ago, so knew it was right in that range, based on their program. Smile

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Re: P-51 / cam

Post  bbf-falcon on May 9th 2013, 12:24 am

Whats the B/S?

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Re: P-51 / cam

Post  dfree383 on May 9th 2013, 12:26 am

It will work, but its definetly not right.

Cams a little small for a race car and you need to make sure the probe's have the correct valve relief.
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Re: P-51 / cam

Post  bbf-falcon on May 9th 2013, 12:46 am

glenevans wrote:14.03 based on Wallace Racing calculator with 3cc piston (probe), zero deck, 72cc chamber. I had figured it a week ago, so knew it was right in that range, based on their program. Smile

You are right.I just seen where you had a 545. Wink

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Re: P-51 / cam

Post  glenevans on May 9th 2013, 12:49 am

4.39" bore, 4.50" stroke. I just have never had a roller cam......

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Re: P-51 / cam

Post  dfree383 on May 9th 2013, 12:56 am

Now would be a good time to get one IMO.
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Re: P-51 / cam

Post  glenevans on May 9th 2013, 1:01 am

probably right ......

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Re: P-51 / cam

Post  bigjohn2007 on May 11th 2013, 8:56 am

dfree383 wrote:It will work, but its definetly not right.

Cams a little small for a race car and you need to make sure the probe's have the correct valve relief.
x2
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Re: P-51 / cam

Post  4thHorseman on May 13th 2013, 10:14 am

Yeah, with that cam you're leaving about 100 thou's valve lift on the table. You'd be much happier to step it up.


Last edited by 4thHorseman on May 15th 2013, 4:19 pm; edited 1 time in total
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Re: P-51 / cam

Post  glenevans on May 13th 2013, 4:56 pm

Sweet car 4th Horse, but I'm biased to '69 fastbacks w/boss 9 scoops ( Mine is Wimbledon white ) Smile what size cam do you run ?

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Re: P-51 / cam

Post  4thHorseman on May 15th 2013, 12:29 pm

It's a comp cams solid roller stick with specs by Kaase suited to my car's heavy weight and high altitude where I'm at. It has a 109 cl and lift in the .760 area with 280 duration at .050. I have the cam card someplace in my shop but I'm at work now.
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Re: P-51 / cam

Post  Lem Evans on May 15th 2013, 1:05 pm

Is this a drag race deal? What is your conv. stall?

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Re: P-51 / cam

Post  glenevans on May 15th 2013, 2:40 pm

I do mostly bracket racing with the car, but occasionally drive on street. I have an 8" continental converter, 4900 stall. 4.11 gears, wide ratio c6, full weight 1969 mach 1. Currently crosses finish line @ 6400 rpm w/ dove-c heads , 2" crites headers. Footbrake start. Also high elevation here in SLC, Utah about 4400 ft.

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Re: P-51 / cam

Post  glenevans on May 15th 2013, 4:58 pm

crank is scat cast 9000 series, so probably need to limit rpm's

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Re: P-51 / cam

Post  Lem Evans on May 15th 2013, 5:15 pm

glenevans wrote:I do mostly bracket racing with the car, but occasionally drive on street. I have an 8" continental converter, 4900 stall. 4.11 gears, wide ratio c6, full weight 1969 mach 1. Currently crosses finish line @ 6400 rpm w/ dove-c heads , 2" crites headers. Footbrake start. Also high elevation here in SLC, Utah about 4400 ft.

Vacuum brakes?

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Re: P-51 / cam

Post  glenevans on May 15th 2013, 5:24 pm

I converted to manual brakes ('74 maverick disc / drum master cylinder), manual steering and no A/C.

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Re: P-51 / cam

Post  Lem Evans on May 15th 2013, 7:29 pm

I apologize for asking so many questions but, many times it aint about caming the engine. It's about caming a guys combination.

1] 4900 Vs 5600 stall.

2] Foot brake Vs transbrake.

3] 4400 Elv. Vs 400 Elv.

4] 3400 lbs Vs 2400 lbs

There is not one answer given the variables.


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Re: P-51 / cam

Post  glenevans on May 15th 2013, 9:00 pm

I do appreciate the time and info that has been given here. Yes, I do agree with you Lem that the combo needs consideration to properly cam and build the engine. I sort of started out thinking I would drive this car more on the street, but it has been leaning toward racing only. I guess the overall goal with this particular car would be low to mid 10 sec. quarter mile times after getting the good heads, mafia intake etc. Smile

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