norsk
SILVER Star
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- #21
Edelbrock makes a very nice dual plane manifold specific to Vortec heads. I have been using one for the past ten years. It currently sports a home made (ok, red neck) TBI adapter plate and big block throttle body.
Norsk, I think you may find more usuable torque and certainly better economy with a cam that has no more than 212 degrees at .050" The larger cams make more torque, but not really the type of power you can hook up the a 5000# trailer and be happy. They're great for hot rods, but not always for trucks. The overlap is very effective for cylinder charging at low RPM, but you pay a penalty with mileage and heavily loaded operation. The overlap is not good for use with FI, which as I recall, you plan on doing sooner or later. The unburned fuel that makes it out the pipes due to the overlap tells the FI to go leaner which is really doesn't need to do in that case. Go with a roller cam and go with some good lift, moderate duration. Just my random thoughts...
I think that is the Edelbrock manifold I am referring to. There is a spreadbore to TBI adapter that fits just nice on the manifold for later.
The CAM choice HAS been highly subject to change in my build design.
I have been jumping between 2 of the CompCAMs (all the CAMs are hydro Rollers - I will also be using full self aligning rocker arms too):
The more milder one
12-411-8 which has 210/214 @ .050
COMP Cams: Xtreme 4x4™, X4260HR <BR> Good Mid-Range, Good Performance Increase
and the
12-413-8 which has 220/224 @ .050
COMP Cams: Xtreme 4x4™, X4260HR <BR> Good Mid-Range, Noticeable Idle
both have Lobe Separation Angle at 111 and Intake Centerline at 107. Lift on both is .474 with 1.5 rockers.
I think because I told the CompCAMs tech I had 4.11 gears, he recommended the 220/224 which has a power range of 1500 to 5500
The 210/214 cam has 1200 to 5200 range.
I have looked at the valve overlap for them on the Simulator, but don't remember them at the moment, but will get them on there after I get home.
BTW: That Dyno Sim5 has given me alot of insight into what various configurations can do.
(EDIT: The following CAM is the one I installed)
A more mild CAM is the 12-409-8
COMP Cams: Xtreme 4x4™, X4258HR <BR> Strong Torque, Good Mileage
Its specs are 206/210 @ .050, same LSA and ICL as the other two. But it only lifts to .458 and with a Range of 1000 to 5000 RPM. I think this is the one you indicated you had in your truck
It does say it has good torque and good mileage. I haven't run its numbers thru the Simulator yet. I will do that and report.
I have found this to be a great "hobby" at my age and stage of life, and it is centered around the FJ60. It has been 40 years since I had a dream to do this, but 6 kids, and other things kept be busy and broke before this time.
I do plan to play with FI later, and I have NO problem pulling the CAM and putting one that is FI friendly in as you mentioned later. I am putting a two piece timing cover on it so I don't have to crack the oil pan to do so.
Yet, I may yet decide to put in the mildest CAM at first, if input from you and others points that way. Its all in design stage now. (Well, not the head, that is at the machine stop, but I still have time to change the design. Looking for options.
thanks for the input, ALL of these comments help.
Please if others have question or comments, please post, I have having fun learning and actually DOING THIS.
dougbert
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