torque monster build!!!!!
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Joined: Feb 2001
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From: Canada
torque monster build!!!!!
Hey guys thought I'd share my build up. Rebuilding a 79' 300i6, so far going with a Comp cam 268/268, Keith Black alum pistons, offy alum dual plane intake, holly 670 carb, and a hooker super comp header setup. Lots of other small aftermarket stuff but I don't feel like listing it. Since the header is a dual collector i'm going with a dual 2 1/2" to single 3", I want it to sound like a tractor but look like a diesel! Any one done a similar build?
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From: Spokane, WA
JMO, FWIW...with that big a cam your power band is going to be at a high rpm. Your idle and driveability will suck for low to mid range driving. Fuel mileage likewise. Tuning the carb will be difficult because of low vacuum with that cam. Better something not in the "lumpy" range. The Offy Dual Port is probably best with a maximum 500 cfm carb...maybe a 470 Truck Avenger, Edelbrock 500 or 570 Street Avenger max. If you must have a big cam and carb use an Offy C or Clifford intake.
When it comes to cams and carbs especially for useable torque, driveability and mpg, bigger is not always better.
When it comes to cams and carbs especially for useable torque, driveability and mpg, bigger is not always better.
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Joined: May 2002
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From: Broken Arrow, OK
The 268 isn't that big. 50 cube cylinders should handle it OK. It's barely bigger than the Crane cam that's very popular. However, if I wanted to emphasise big low end torque I would be looking at other grinds. Most companies have grinds for the 300, but some were designed 30 years ago and it shows. Crower has what appear to be some excellent grinds. Check out Crower's level 3 cam. It's 260/268 on the seats, 202/210@0.050 and .443/.448. They say it will wind up to 6000 rpm, but I think that's pretty optimistic. If your head flow well into the .500 range it would be worth it to add some 1.7 rockers to the mix. I saw some others that I really like the looks of, but don't remember where I saw them. They were dual pattern, but nearly as much so as the other offerings.
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Joined: Dec 2006
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From: Spokane, WA
Actually, not enough info. What is the intended use? Is this engine being built for a working torque use or is it a "bragging rights" build? Either way is fine. I would speculate that with that cam peak torque will be achieved somewhere around the middle of the operating range of that cam. Single pattern cams are old technology but they still have their use and can suit a purpose. The Offy DP and that carb are not a particularly good match.
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Joined: May 2002
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From: Broken Arrow, OK
Single pattern cams are not old technology. Yes, they are the oldest design out there, but that doesn't mean they are obsolete. Single pattern cams actually out perform dual pattern cams when the rest of the combination is up for the job. The problem is that 90% of all performance engines are still build by people in their garage that don't know how badly their stock heads are killing their power. Most stock heads are mush worse off on the exhaust port, so a dual pattern cam helps them make more power, but at the expense of efficiency. The 300 does not have the inherint exhaust flow shortage that many engines have because the intake and exhaust valves both point toward their port openings instead of the exhaust pointing away and having to make over a 90 degree turn to get out of the valve bowl. The 300 still has an exhaust flow deficiency, but I don't think it's as bad as most engines. I wish I could remember who I found that made cams that with only about a 5 or 6 degree duration split, they had some really good looking grinds. I've posted about them here before, I'll see if I can find them.
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From: Spokane, WA
I didn't mean to infer they are obsolete. The longevity of some things and the demand for them is adequate testimony to their contemporary value. I used a single pattern cam in my build and I would do the same if I had it to do over. My point is that the parts should be matched to achieve the intended use and purpose with a caution that some things are not necessarily better because they are bigger. Cams and carbs are two of those things.
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What kind of hp numbers can be made with a 300 max effort.Ive never seen anthing about it.Anyone know.Im just curious
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Joined: Dec 2006
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From: Spokane, WA
Did some searching but didn't find it but as I recall one person that uses a 300 in a drag wagon is around 500 hp but that is with a non-stock head plus other refinements that are certainly not applicable to a street machine. Look up Col Flashman on this Forum. He has built what I consider the ultimate 300 street machine at 300 hp with a rock steady idle and as I recall torque is around 400.
Ford Six Performance: The Web's Leading Resource for Ford Inline Six-Cylinder Engines and Cars! There is a tech article on cam selection for SB6's but the principles apply to the BB6 as well.
Ford Six Performance: The Web's Leading Resource for Ford Inline Six-Cylinder Engines and Cars! There is a tech article on cam selection for SB6's but the principles apply to the BB6 as well.
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Joined: May 2002
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From: Broken Arrow, OK
The rail is the Frenchtown Flyer.
There was an article in Popular Hot Rodding in the mid 70's that used 351C 4V heads that were cut and rewelded into a single 6 cylinder head and made over 500 hp with it. It's no different than any other engine; you can make as much power as your wallet will allow.
There was an article in Popular Hot Rodding in the mid 70's that used 351C 4V heads that were cut and rewelded into a single 6 cylinder head and made over 500 hp with it. It's no different than any other engine; you can make as much power as your wallet will allow.
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Joined: Dec 2006
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From: Spokane, WA
The following update and pictures were added on Oct 28 2002
Pics of the FTF there...I just didn't find where I had read 500 hp. I think it was on the FSP Forum.
Pics of the FTF there...I just didn't find where I had read 500 hp. I think it was on the FSP Forum.
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