What's your experience with the Comp Cams 260H Camshaft?

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TurboBronco
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What's your experience with the Comp Cams 260H Camshaft?

Post #1 by TurboBronco » Thu Jan 18, 2018 2:51 pm

I'm doing a complete engine rebuild that will go into my son's 83 F250 4x4. Will be using an Offy DP intake, EFI manifolds, Walker Y Pipe(2.5 outlet) to Single in Dual Out exhaust, Bone Stock EFI Head, Edelbrock 500 4 Bbl carb, NP435 4 speed manual, believe the rear gears are 4.10, but still trying to confirm that. Primary use will be a spirited, torquey, reliable daily driver and some light towing.

The engine is completely disassembled, has been cleaned, honed, new camshaft bearings and decked .01. It is a 92 block. Getting close to reassembly.

Going with the following:
Speed Pro H19 Hyper pistons (8.8 Compression with EFI Head)
New main bearings
New rod bearings
New ARP rod bolts
New steel timing gear set
New oil pump
New water pump
New arp head studs
New gaskets

I've read a lot of posts about different cams but am leaning towards the Comp Cams 260H cam. The only concern I have is the Dynamic Compression Ratio. I've used several online calculators and I'm getting 7.5 with the KB\Silvolite calculator based on the cam specs. 7.5 seems a little high for 87 octane gas. No EGR.

I'd be really interested in any real world experience with this cam, particularly related to pinging, timing and gas octane. I really hope to run on 87 octane.

Also, any tips for cam break in? This will be my first new camshaft.
Planning on the following:
Quality Moly lube on cam lobes and bearing surfaces
Conventional 30 weight non-detergent oil
ZDDP additive in the oil
Marvel Mystery Oil
Overfill engine oil so there is plenty of oil splash
Fire up as soon as possible on first start up
Hold at 2000-3000 RPM for 30 minutes for complete break in

Thanks,
Brad
1985 Ford F250 2WD, Bone Stock 300, T18 Four Speed, OEM intake, OEM Exhaust Manifold, Autolite Single Barrel Carb; 2.5" Exhaust from firewall back, Project in Progress!!

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THE FRENCHTOWN FLYER
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Re: What's your experience with the Comp Cams 260H Camshaft?

Post #2 by THE FRENCHTOWN FLYER » Thu Jan 18, 2018 7:29 pm

You don't need to overfill the engine.
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jason832
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Re: What's your experience with the Comp Cams 260H Camshaft?

Post #3 by jason832 » Thu Jan 18, 2018 8:15 pm

I have a very close build to yours. Same pistons, felpro 1024 head gasket, carbed head milled .060, comp 268 cam. If my math was correct I have 8.8 static and 7.32 dynamic. I run it on 87 octane, but sometimes it diesels on after turning the key off leading to believe I need premium gas.... My timing is set a bit retarded of when it pings at low rpm, perhaps if I get a timing light and see what timing it will accept I can determine if 87 octane is too low.

TurboBronco
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Re: What's your experience with the Comp Cams 260H Camshaft?

Post #4 by TurboBronco » Fri Jan 19, 2018 8:26 am

Thanks for the replies! I can't wait to get this engine back together and into the truck.
1985 Ford F250 2WD, Bone Stock 300, T18 Four Speed, OEM intake, OEM Exhaust Manifold, Autolite Single Barrel Carb; 2.5" Exhaust from firewall back, Project in Progress!!

161henry
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Re: What's your experience with the Comp Cams 260H Camshaft?

Post #5 by 161henry » Fri Jan 19, 2018 9:35 am

I have that cam in my ratrod. Same pistons as you. Everything in your build is the same as mine except I have a 1970ish carb 300 head. I used comp lifters, springs and push rods. It runs fine on Iowa's 87 octane 10% alcohol. But keep in mind I'm not an expert.. Everything I know I learned here. If I remember correctly that cam is 1000 to 5000 power band. Right now I have a Carter 1 barrel carb. So it stops pulling long before the 5000 mark. I run a ford top loader 4 speed 13% overdrive 3.55 rear gears and 31 inch rear tires. About 1700 rpm at 72 mph. And solid 22 mpg if I stay under 60. I'm happy with the cam I could have gotten along with the next smaller but I'm going to put more carb on later.

TurboBronco
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Re: What's your experience with the Comp Cams 260H Camshaft?

Post #6 by TurboBronco » Fri Jan 19, 2018 9:54 am

161henry wrote:I have that cam in my ratrod. Same pistons as you. Everything in your build is the same as mine except I have a 1970ish carb 300 head. I used comp lifters, springs and push rods. It runs fine on Iowa's 87 octane 10% alcohol. But keep in mind I'm not an expert.. Everything I know I learned here. If I remember correctly that cam is 1000 to 5000 power band. Right now I have a Carter 1 barrel carb. So it stops pulling long before the 5000 mark. I run a ford top loader 4 speed 13% overdrive 3.55 rear gears and 31 inch rear tires. About 1700 rpm at 72 mph. And solid 22 mpg if I stay under 60. I'm happy with the cam I could have gotten along with the next smaller but I'm going to put more carb on later.


Sounds great, thanks! 22MPG is fantastic.

I believe Harte3 also has this cam and pulls a boat and lugs it down to 1200 RPM on grades without pinging issues. I'm hoping for the same.
1985 Ford F250 2WD, Bone Stock 300, T18 Four Speed, OEM intake, OEM Exhaust Manifold, Autolite Single Barrel Carb; 2.5" Exhaust from firewall back, Project in Progress!!

pmuller9
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Re: What's your experience with the Comp Cams 260H Camshaft?

Post #7 by pmuller9 » Fri Jan 19, 2018 10:01 am

The Crower 266HDP (19213) .456”/.461”, 210/213, 266/274, 112deg LSA will decrease the DCR and give you equivalent performance.

TurboBronco
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Re: What's your experience with the Comp Cams 260H Camshaft?

Post #8 by TurboBronco » Fri Jan 19, 2018 10:23 am

pmuller9 wrote:The Crower 266HDP (19213) .456”/.461”, 210/213, 266/274, 112deg LSA will decrease the DCR and give you equivalent performance.


Awesome! I'll check it out.

Thanks!
1985 Ford F250 2WD, Bone Stock 300, T18 Four Speed, OEM intake, OEM Exhaust Manifold, Autolite Single Barrel Carb; 2.5" Exhaust from firewall back, Project in Progress!!

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wsa111
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Re: What's your experience with the Comp Cams 260H Camshaft?

Post #9 by wsa111 » Fri Jan 19, 2018 12:56 pm

The Comp cam is an antiquated profile. The Crower or Schneider would be even better. Make sure you install the correct valve springs for the cam you choose.
67 mustang,C-4, with mod. 80 hd, custom 500 cfm carb with annular boosters, hooker headers, dual exh.-X pipe, flowmaster mufflers, duraspark II dist. with MSD-6AL. Engine 205" .030" over with offset ground crank & 1.65 roller rockers. 9.5 comp., Isky 262 cam.
2003 Ford Lightning daily driver. Recurving Distributors. billythedistributorman@live.com
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161henry
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Re: What's your experience with the Comp Cams 260H Camshaft?

Post #10 by 161henry » Fri Jan 19, 2018 11:01 pm

TurboBronco wrote:
161henry wrote:I have that cam in my ratrod. Same pistons as you. Everything in your build is the same as mine except I have a 1970ish carb 300 head. I used comp lifters, springs and push rods. It runs fine on Iowa's 87 octane 10% alcohol. But keep in mind I'm not an expert.. Everything I know I learned here. If I remember correctly that cam is 1000 to 5000 power band. Right now I have a Carter 1 barrel carb. So it stops pulling long before the 5000 mark. I run a ford top loader 4 speed 13% overdrive 3.55 rear gears and 31 inch rear tires. About 1700 rpm at 72 mph. And solid 22 mpg if I stay under 60. I'm happy with the cam I could have gotten along with the next smaller but I'm going to put more carb on later.


Sounds great, thanks! 22MPG is fantastic.

I believe Harte3 also has this cam and pulls a boat and lugs it down to 1200 RPM on grades without pinging issues. I'm hoping for the same.


Just remember that 22mpg is in a 3500 lbs vehicle without 4.10 gears.

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