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Old 07-15-2004, 02:37   #1 (permalink)
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biggrin Desktop Dyno Help

Ball park figure? What kind of HP can I look for? 351C, 4V closed chambered heads, compression about 9.5, Comp.Cam. EX284H RPM op. range 2300-6500, adv. 284/296, @50", 240/246, valve lift, 584/588. F351 Edelbrock manifold, 735 Holley Carb. Headers. To be used on the street, on weekends no track use. Just looking for a nice street motor with a nice lope...Thanks
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Old 07-15-2004, 02:42   #2 (permalink)
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Re: Desktop Dyno Help

you don,t say what heads you use .2v or 4v?
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Old 07-15-2004, 03:12   #3 (permalink)
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Re: Desktop Dyno Help

Sorry about that, 4V closed chambered...
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Old 07-15-2004, 04:09   #4 (permalink)
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Re: Desktop Dyno Help

without even using an engine analyser,I would guesstimate 400 easy,perhaps more. I would guess from your namesake that this combo is going to reside in a Pantera as well. The f351 4v intake supposedly has smallish intake ports to enhance velocity thru the tract to enhance torque,something the 4v headed engines are notoriously lacking. I would seriously consider the use of some form of intake port tongue for the 4v to reduce port volume and speed up charge velocity. Air speed is critical in maintaining that the fuel does not drop out of suspension with the air. Thats why in a lot of instances the 2v,s are a better street orientated head up to a certain rpm limit. In stock form the 4v has around 260 cc as compared to 170cc for a 2v so any reduction in port volume would be beneficial.
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Old 07-15-2004, 11:19   #5 (permalink)
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Quote:
Originally Posted by russxr67
without even using an engine analyser,I would guesstimate 400 easy,perhaps more. I would guess from your namesake that this combo is going to reside in a Pantera as well. The f351 4v intake supposedly has smallish intake ports to enhance velocity thru the tract to enhance torque,something the 4v headed engines are notoriously lacking. I would seriously consider the use of some form of intake port tongue for the 4v to reduce port volume and speed up charge velocity. Air speed is critical in maintaining that the fuel does not drop out of suspension with the air. Thats why in a lot of instances the 2v,s are a better street orientated head up to a certain rpm limit. In stock form the 4v has around 260 cc as compared to 170cc for a 2v so any reduction in port volume would be beneficial.
Yes, in the Pantera. I may look in to the port tongue or port plates, You think intake only or both in/ex? I thought I might even try a funnel web intake? If this combo comes close to 400HP I would be thrilled...
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Old 07-15-2004, 16:00   #6 (permalink)
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Re: Desktop Dyno Help

Quote:
Originally Posted by Pantera
Yes, in the Pantera. I may look in to the port tongue or port plates, You think intake only or both in/ex? I thought I might even try a funnel web intake? If this combo comes close to 400HP I would be thrilled...
I would definitely recommend a set of the AFD 2V cylinder heads for this engine and to pull the extra 50# out from under your back seat! You can also run much higher compression with the alloy heads.

The F351 isn't a direction I would take with a Pantera. I recommend a Funnelweb if it will fit. The best thing going for a street engine is, IMO, a set of AFD 2V heads and a Parker Funnelweb 2V.

I personally would use a different camshaft, especially in a Pantera. I would select a nice hydraulic roller grind that would have much better total response and run a whole lot better than the XE grind, which isn't "bad" just not as good as you can get. For my own use, I would select a HR over a SR in this particular case because I wouldn't want to hear a lot of valve train noise right behind my head.

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