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Comp Cam's 268 Impressions in a 67 F-100

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Factoryblue
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Comp Cam's 268 Impressions in a 67 F-100

Post #1 by Factoryblue » Tue Apr 19, 2005 12:09 pm

Hey all, I lurk more than post here. Awhile back I posted some pics of my 67 Step side truck wich I had built a 300 for. I was able to drive it 200 miles to school yesterday and wanted to post some impressions about it concerning the modifications. First off, this is a 67 f-100 short wb step side, redone from the ground up. I choose the 300 because the original 240 was coverd in red clay and didnt feel like starting over with it. I started with a used Carbed block and rotating assembly. A local machine shop punched it 30 over and rebiult the bottom end. Several weeks later I sent them the head and told them I was running 93 octane and for them to do the compression ratio math. I assembled the engine 2 weeks later with ARP Studs and clifford gaskets, after a pocket port job. The other major modifications include Clifford single plane, Thorley headers, Comp 268, MSD 6A W DSII distributor, and electric fuel system. I had posted about many problems trying to run a holley 4160/ 600cfm carb. I ditched it infavor of a 4160/ 390 cfm. Other considerations are a TOD 4spd, and ford 9"(no clue). Anyways, the 268 cam has plenty of torque for high way and around town. How ever it would not be a good towing, or work truck cam. I was able to climb some big hills in eastern KY with out feeling it at 1,500 RPM going about 60 MPH. Driving around town the engine will torque the chassis sideways from 1000 rpm on. The power pulls in about 2500 and then rockets till about 5,500. Apperently I didn't port the breathing end enough.

To anyone considering this cam, do not buy it for the rumbly idle. This cam is great for cruising around and what not. Im looking a a "torqery" cam so I can pull a small trailer, but want to spend some time tunning before I swap out.
Nick Wilson
http://www.fordification.com/galleries/displayimage.php?pos=-1025
http://www.fordification.com/galleries/displayimage.php?pos=-1029
2004 Mustang GT
2007 Fusion SEL
1989 Thunderbird SC
1967 F-100 Step side

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Asa
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Post #2 by Asa » Tue Apr 19, 2005 4:33 pm

love the look of that truck

if you're planning on swapping the cam, why are you going to tune it up? won't the new cam have different characteristics that will make you tune it once again?
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Factoryblue
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Cam

Post #3 by Factoryblue » Tue Apr 19, 2005 6:00 pm

By tuning, I've been messing with the timing/fuel ratio. Ive only got 250 miles on this truck total,so a far assesment hasnt been made. It's great but I want a bit low end and I dont want to port on the head any more, to try and match the cam.

Nick
2004 Mustang GT

2007 Fusion SEL

1989 Thunderbird SC

1967 F-100 Step side

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rhetor
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Post #4 by rhetor » Tue Apr 19, 2005 6:18 pm

you could also consider a numerically higher rear end if you'd like to keep power in that rpm range.

i guess thats how the newer trucks work... cuz they aint got nothin below 2000rpm!
300- mild head porting - 204/214 cam - 1.73 rollers - 2.5" exhaust DEAD AND GONE!

New truck- 71 F-100 302/AOD. Missing my 300 dearly. 302 belongs in a mustang, lifters tick, headers sound annoying, vibrates, is ugly, etc.

maynard

Post #5 by maynard » Tue Apr 19, 2005 11:35 pm

I regularly lug 1500-2000 lbs of wood with my 300 using the 268 cam in my rebuild.

The cam comes in around 1300 RPM in my truck and has never struggled carrying a full load at that RPM. I don't consider 1300 RPM to be excessive and is right close to the spec on Comp's website.

That said, I do wish it had more bottom end but I'm also over-carbed at this point with a 600CFM Edelbrock.

The torque should get better with a 500 CFM carb.

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Post #6 by Ronbo » Wed Apr 20, 2005 5:01 am

Ive never tried this with a six but it worked great in a V8 with the Comp Cams 268H. I advanced the cam timing 4 degrees and it dropped the power/torque band down to around 1500 rpm and pulled like a bear until around 4500 rpm. Just something to think about before you buy another cam.

Ron
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timmytim240
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Re: Comp Cam's 268 Impressions in a 67 F-100

Post #7 by timmytim240 » Fri Jan 13, 2012 11:50 pm

Factoryblue wrote:Hey all, I lurk more than post here. Awhile back I posted some pics of my 67 Step side truck wich I had built a 300 for. I was able to drive it 200 miles to school yesterday and wanted to post some impressions about it concerning the modifications. First off, this is a 67 f-100 short wb step side, redone from the ground up. I choose the 300 because the original 240 was coverd in red clay and didnt feel like starting over with it. I started with a used Carbed block and rotating assembly. A local machine shop punched it 30 over and rebiult the bottom end. Several weeks later I sent them the head and told them I was running 93 octane and for them to do the compression ratio math. I assembled the engine 2 weeks later with ARP Studs and clifford gaskets, after a pocket port job. The other major modifications include Clifford single plane, Thorley headers, Comp 268, MSD 6A W DSII distributor, and electric fuel system. I had posted about many problems trying to run a holley 4160/ 600cfm carb. I ditched it infavor of a 4160/ 390 cfm. Other considerations are a TOD 4spd, and ford 9"(no clue). Anyways, the 268 cam has plenty of torque for high way and around town. How ever it would not be a good towing, or work truck cam. I was able to climb some big hills in eastern KY with out feeling it at 1,500 RPM going about 60 MPH. Driving around town the engine will torque the chassis sideways from 1000 rpm on. The power pulls in about 2500 and then rockets till about 5,500. Apperently I didn't port the breathing end enough.

To anyone considering this cam, do not buy it for the rumbly idle. This cam is great for cruising around and what not. Im looking a a "torqery" cam so I can pull a small trailer, but want to spend some time tunning before I swap out.
Nick Wilson
http://www.fordification.com/galleries/displayimage.php?pos=-1025
http://www.fordification.com/galleries/displayimage.php?pos=-1029

Can you run stock valve springs with the 268 cam? :thanks:
Timmytim
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might sound like !@#$ going through an 8" sewer pipe to others.
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Re: Comp Cam's 268 Impressions in a 67 F-100

Post #8 by woodbutcher » Fri Jan 13, 2012 11:57 pm

:beer: Hi Factoryblue.About that truck.Slobber,slobber drool.That is OUTSTANDING.
Good luck.Have fun.Be safe.
Leo
"People never lie so much as after a hunt,during a war,or before an election".
Otto von Bismarck

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StrangeRanger
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Re: Comp Cam's 268 Impressions in a 67 F-100

Post #9 by StrangeRanger » Sat Jan 14, 2012 7:03 am

timmytim240 wrote:Can you run stock valve springs with the 268 cam?


Not a good idea. The combination of higher lift and faster ramps may or may not cause short term problems but it certainly will lead to fatigue and premature spring failures
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yolocah
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Re: Comp Cam's 268 Impressions in a 67 F-100

Post #10 by yolocah » Tue Jan 24, 2012 11:25 pm

FactoryBlue,
What do you think of your clifford intake manifold(which model) and thorley headers? I noticed that you switched out all your accessories and injection system are they for sale?

yolocah

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80broncoman
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Re: Comp Cam's 268 Impressions in a 67 F-100

Post #11 by 80broncoman » Wed Jan 25, 2012 10:50 am

yolocah wrote:FactoryBlue,
What do you think of your clifford intake manifold(which model) and thorley headers? I noticed that you switched out all your accessories and injection system are they for sale?

yolocah


You may not get a answer from the Orignal poster as he hasen't been online on this site since Nov of 2009.

Did you notice he poset this thread nearly 7 years ago??
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Re: Comp Cam's 268 Impressions in a 67 F-100

Post #12 by nightwatchman59 » Wed Feb 13, 2013 9:42 pm

I'm still studying... carefully scanning page by page, looking for info and trying hard to keep my 2 cents in my pocket. I DO wish to shaare my concern about Comp Cams- they get alot of praise. Well deserved. My problem w/ them is that they appear generic w/ the grinds they offer. Example: a 268 grind for a 351C has the same specs. as a351M, 400M, 429 and 460. Look it up. The cam is the brain of a non computer engine.... Comp grinds everything on 110 lobe separation..... sorry. Anyway, my uncle always used 268's in all the dump truck overhauls, and the drivers all loved him for it! His theory is that the BIGGEST restriction in the intake track is the VALVE itself...

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