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looking at cams

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67chrrybucket
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looking at cams

Post #1 by 67chrrybucket » Fri Jul 05, 2013 6:38 pm

I was shopping on the old summit racing for a cam for my 300 i was most interested in the comp 252 grind for my street comet but looking at the rpm range on this cam is 4500 about all i need out of this 300 or should i step up to the 260 grind? Also i noticed a howard cams cam that was right in the middle of those two but had a 108 lobe center im going to guess that would be too rough an idle for a street machine?
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80broncoman
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Re: looking at cams

Post #2 by 80broncoman » Sat Jul 06, 2013 10:29 am

67chrrybucket wrote:I was shopping on the old summit racing for a cam for my 300 i was most interested in the comp 252 grind for my street comet but looking at the rpm range on this cam is 4500 about all i need out of this 300 or should i step up to the 260 grind? Also i noticed a howard cams cam that was right in the middle of those two but had a 108 lobe center im going to guess that would be too rough an idle for a street machine?


If your wanting a noticeable power increase you will need more than that 252 cam. The 252 really isn't all that different from the stock cam. in a smaller lighter vehicle you could stand to have ever more than the 260 you are thinking about.
I'd think you wern't going to swap in a 300 just because you have one laying about......
compression , trans (which torque converter if auto), which intake & carb, useage all come into play.
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Re: looking at cams

Post #3 by THE FRENCHTOWN FLYER » Sat Jul 06, 2013 11:00 am

80broncoman wrote:
If your wanting a noticeable power increase you will need more than that 252 cam. The 252 really isn't all that different from the stock cam. in a smaller lighter vehicle you could stand to have ever more than the 260 you are thinking about.
I'd think you wern't going to swap in a 300 just because you have one laying about......
compression , trans (which torque converter if auto), which intake & carb, useage all come into play.

I agree. I'm using a CC 268 in my Anglia build, similar to the one in my Willys coupe, which runs "nicely" with that much cam.
FORD 300 INLINE SIX - THE BEST KEPT SECRET IN DRAG RACING

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Re: looking at cams

Post #4 by 67chrrybucket » Sat Jul 06, 2013 6:36 pm

Well it will be a in a lightweight Comet with a 4 speed toploader wide ratio mostly street driven with an occasional 1/4 mile runs so broncoman i just got one in trade but its what i wanted to do since i got the Comet so i guess i was thinking too small so i should be thinking 268? I just didnt want to overcam or float valves,as far as intake and carb i was thinking offy c and a edelbrock carb,and a 3.25 RAR
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Re: looking at cams

Post #5 by 80broncoman » Sat Jul 06, 2013 7:12 pm

67chrrybucket wrote:Well it will be a in a lightweight Comet with a 4 speed toploader wide ratio mostly street driven with an occasional 1/4 mile runs so broncoman i just got one in trade but its what i wanted to do since i got the Comet so i guess i was thinking too small so i should be thinking 268? I just didnt want to overcam or float valves,as far as intake and carb i was thinking offy c and a edelbrock carb,and a 3.25 RAR


Yes defiantly get you a 268 cam. it would be my choice for sure. If the cam you got is a NEW comp cam Comp might just trade you out. We did that at Crane years ago to keep parts out of the flea markets.
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Re: looking at cams

Post #6 by 67chrrybucket » Sun Jul 07, 2013 4:16 am

I have not bought cam yet but im glad i posted this question first i like the idea of a bigger can i was just worried about over caming but since i was planning on a 200 it makes sense a bigger cam would be neaded
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Re: looking at cams

Post #7 by MechRick » Mon Jul 08, 2013 1:07 am

The Comp 268 is a nice grind. Since I've recently swapped back to the stock cam in mine, I can tell you that anything milder and you might as well run a stock grind (mine was supplied by Melling). To quote Dave Williams of Fordnatics fame, "cheap is a quality overcoming many faults".

The 268 isn't dramatically thirstier, either, although the bump in dynamic compression may require top shelf octane.

The kicker is, if you run a carb head and an Offy C intake you are going to get a nice, rumpity lope at idle.
Last edited by MechRick on Mon Jul 08, 2013 5:53 pm, edited 1 time in total.
1994 F150, 4.9L/ZF 5 speed, C-Vic police driveshaft
EFI head w/mild port work, 3 angle valve job
1996 long block, stock pistons, ARP rod bolts
Stock cam, aluminum cam gear
Hedman header, full mandrel bent duals, crossover, super turbos
http://fordsix.com/forum/viewtopic.php?f=2&t=73244
Bronco II with a 2.3L swap http://fordsix.com/forum/viewtopic.php?f=13&t=72863
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Re: looking at cams

Post #8 by 67chrrybucket » Mon Jul 08, 2013 5:11 am

I like a nice lope on the idle as long as it doesnt affect performance,so anybody that answered this post that has a comp cam do i run any advance when degreeing or straight up? I guess im going with a CC268 grind :nod:
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Re: looking at cams

Post #9 by THE FRENCHTOWN FLYER » Mon Jul 08, 2013 8:47 am

One other suggestion I would like to make is to use a higher stall converter - that will really wake up your lightweight ride. In my '33 coupe I use a ten inch 351 Cobra Jet factory converter, which has a rated stall speed of 2500 RPM. (Interestingly, behind my 305 engine it also stalls at 2500 RPM which tells you that at that speed the 305 makes about the same torque as a 351 CJ.) Likewise, my kids' 240 mildly built Anglia has a 4000 stall 10 inch converter and it is very tractible on the street and runs 14s at the strip.

I remember when I first got involved with using torque converters for performance builds. I argued with my mentor that my 300 six should have a tight, low stall converter because of the low RPM qualities of our six. Unconvinced he told me, "Go ahead and use a tight one. You aren't going to know how much a high stall converter will help you until you try a tight one."

Of course, fuel consumption was of no concern to me - just going fast.
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Re: looking at cams

Post #10 by 67chrrybucket » Mon Jul 08, 2013 6:15 pm

FTF Im using a 4 speed toploader transmiss wide ratio like you suggested, no autos in my ride
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Re: looking at cams

Post #11 by Baron Von Ottomatic » Mon Jul 08, 2013 6:20 pm

I think Comp sells a pretty hot solid lifter cam for the 300, something like 220 degrees @.050 on 108 lobe centers. As long as you don't mind adjusting the valves every now and again it ought to run nice in something like a Comet.

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Re: looking at cams

Post #12 by 80broncoman » Mon Jul 08, 2013 9:17 pm

Baron Von Ottomatic wrote:I think Comp sells a pretty hot solid lifter cam for the 300, something like 220 degrees @.050 on 108 lobe centers. As long as you don't mind adjusting the valves every now and again it ought to run nice in something like a Comet.


if you deduct 6-8 degrees of duration @ .050 for the lash in a solid a 220 solid cam is smaller than the 268 hyd cam.
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Re: looking at cams

Post #13 by Baron Von Ottomatic » Tue Jul 09, 2013 7:10 am

Hmmm, I would have thought that cam duration measured at .050 - after the lash is played out and the valve is off the seat - would be what it is. You know, like a solid lifter cam with 280 advertised duration but 220 degrees @ .050 vs. a hydraulic cam with 268 advertised that shows 218 degrees at .050. But apparently I would have thought wrong.

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Re: looking at cams

Post #14 by 67chrrybucket » Tue Jul 09, 2013 5:04 pm

Okay so i called Comp cams and had them spec me out a cam with a basically stock 300 with the offy c intake 4 barrel carb and the efi exh manifolds this is the cam he sent me i wanted to get opinions fromt those who have already comented Comp cams 224/230 duration @ .050 lift .516/.528 108+4 lobe centers valve open 8/47 closed 36/3 i think this looks a bit on the big and choppey side but those who understand cams better than i can please chime in
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Re: looking at cams

Post #15 by Harte3 » Tue Jul 09, 2013 5:30 pm

What model is it...260? 268?
'83 F150 300, 0.030 over, Offy DP, Holley 4160/1848-1 465 cfm, Comp Cam 260H. P/P head, EFI exhaust manifolds, Walker Y Pipe, Super Cat, Turbo muffler, Recurved DSII, Mallory HyFire 6a, ACCEL Super Stock Coil, Taylor 8mm Wires, EFI plugs.

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Re: looking at cams

Post #16 by MechRick » Tue Jul 09, 2013 6:59 pm

That's pretty aggressive. I would hesitate putting that one into a truck, but I think it would work fine in a lightweight car.

If you use that one, pay careful attention to spring pressure and coil bind. It will like to rev.

Also, whenever I see that much duration ground on 108 lobe centers, I look at the advertised duration overlap number. If it is more than 55-60 degrees, then a full length header would produce much more power than cast iron exhausts. The overlap allows scavenging, what David Vizard calls the 5th cycle in a four-stroke engine.

http://www.popularhotrodding.com/engine ... ewall.html

If you want to run EFI exhausts, wider lobe separation angles will reduce the overlap.
Last edited by MechRick on Wed Jul 10, 2013 5:39 pm, edited 1 time in total.
1994 F150, 4.9L/ZF 5 speed, C-Vic police driveshaft
EFI head w/mild port work, 3 angle valve job
1996 long block, stock pistons, ARP rod bolts
Stock cam, aluminum cam gear
Hedman header, full mandrel bent duals, crossover, super turbos
http://fordsix.com/forum/viewtopic.php?f=2&t=73244
Bronco II with a 2.3L swap http://fordsix.com/forum/viewtopic.php?f=13&t=72863
1988 F250 2x4, 460 ZF 5 speed.

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Re: looking at cams

Post #17 by 67chrrybucket » Tue Jul 09, 2013 7:48 pm

Will that lose a lot of low end torque going that aggressive? I was going to use springs lifters retainers lock and rockers from comp if i go with this cam
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Re: looking at cams

Post #18 by MechRick » Wed Jul 10, 2013 12:06 pm

It's a hot street grind. The split duration numbers are for low flowing exhaust ports (not really the case with the big six). But the tight lobe separation usually mean headers. You will usually see split durations on street cams with much wider lobe center angles (112+). I would expect to see specs like this on a cam for a 5.0L.

The torque will come in strong after about 1500 rpm, which won't be a problem in a light car.
Last edited by MechRick on Wed Jul 10, 2013 5:40 pm, edited 1 time in total.
1994 F150, 4.9L/ZF 5 speed, C-Vic police driveshaft
EFI head w/mild port work, 3 angle valve job
1996 long block, stock pistons, ARP rod bolts
Stock cam, aluminum cam gear
Hedman header, full mandrel bent duals, crossover, super turbos
http://fordsix.com/forum/viewtopic.php?f=2&t=73244
Bronco II with a 2.3L swap http://fordsix.com/forum/viewtopic.php?f=13&t=72863
1988 F250 2x4, 460 ZF 5 speed.

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Re: looking at cams

Post #19 by kenny170 » Wed Jul 10, 2013 2:25 pm

Have you seen the headers 66 short bus has for sale?
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Re: looking at cams

Post #20 by 67chrrybucket » Wed Jul 10, 2013 10:43 pm

In your guys opinion what would the drivability of this cam be im sure its going to have a very lumpy idle, mechrick i also wanted to add the advertised duration was 278/280 and at .050 it was 224/230 so its within the 55-60 you were describing
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Re: looking at cams

Post #21 by BIG 6 farmer » Thu Jul 11, 2013 12:12 am

In my opinion... In your Mercury Comet ? With at least a 3.25 axle ratio & your Toploader 4 speed, I dont see a drivability issue. Back in the day.... We all had Fords like that we street Raced. But we had 289-351 V8s. All had 280-300 duration Camshafts, sticks & auto trans. with 3.89- 4.88 Rear axle ratios, 28-30 inch tall, 10-12 inch Slicks. High 11- 13 second Street Cars, was not a smart time in my life. :nono: Also, dont do Slicks or Drag Radials with your 8 inch Axle & 4 speed. :bang:
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Re: looking at cams

Post #22 by 67chrrybucket » Thu Jul 11, 2013 2:58 am

I think i will probably drop a 9" just cause i like to get my foot in it from time to time :nod:
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Re: looking at cams

Post #23 by 80broncoman » Thu Jul 11, 2013 5:24 pm

67chrrybucket wrote:I think i will probably drop a 9" just cause I like to get my foot in it from time to time :nod:


That right up there/\ /\ /\ tells me that cam will do fine for you.

I would also reccomend a slight compression increase from the stock to around 9.0-9.4 to 1 Depending upon what fuel you are going to use. (9.0-9.4 to 1 is what i like for pump gas.)
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Real men don't wear Bowties
When it come to engines If its .001 loose nobody knows, But if its .001 too tight EVERYBODY KNOWS!!
80 bronco FUV (farm utility vehicle)300 T-18 3.50s EFI head, offy C dual plenum, 500 edel carb, 1.7 roller rockers, Crane 260 cam EFI Exh

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Re: looking at cams

Post #24 by Baron Von Ottomatic » Thu Jul 11, 2013 5:51 pm

What kind of head work have you done/are you planning for this engine? Swapping in a big cam like that without a head that can move enough air to support the engine at the rpm range that cam is made to run in will be a disappointment. And x2 on increasing the compression ratio.

You might also take a look at/call Schneider Cams. They sell several hydraulic and solid lifter grinds for the 300 - from mild to wild.

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Re: looking at cams

Post #25 by MechRick » Fri Jul 12, 2013 1:28 pm

viewtopic.php?f=2&t=69462

Schneider grinds are in there.
1994 F150, 4.9L/ZF 5 speed, C-Vic police driveshaft
EFI head w/mild port work, 3 angle valve job
1996 long block, stock pistons, ARP rod bolts
Stock cam, aluminum cam gear
Hedman header, full mandrel bent duals, crossover, super turbos
http://fordsix.com/forum/viewtopic.php?f=2&t=73244
Bronco II with a 2.3L swap http://fordsix.com/forum/viewtopic.php?f=13&t=72863
1988 F250 2x4, 460 ZF 5 speed.

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Re: looking at cams

Post #26 by 67chrrybucket » Sat Jul 13, 2013 1:26 am

I may swap a 240 head and have some port work done which will help either cam i pick im sure.
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Re: looking at cams

Post #27 by 80broncoman » Sat Jul 13, 2013 11:42 pm

67chrrybucket wrote:I may swap a 240 head and have some port work done which will help either cam i pick im sure.


240 head is a great idea but for a different reason.
Ports and valves are same size, however the chamber is smaller
And perfect for a nice little compression bump.
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Real men don't wear Bowties
When it come to engines If its .001 loose nobody knows, But if its .001 too tight EVERYBODY KNOWS!!
80 bronco FUV (farm utility vehicle)300 T-18 3.50s EFI head, offy C dual plenum, 500 edel carb, 1.7 roller rockers, Crane 260 cam EFI Exh

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