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Is F-150 Still King?
 
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Old 07-15-2009, 08:57 AM
F-250 restorer F-250 restorer is offline
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Offy heating plate
Hey guys--

I live in S. California. Do I need to connect my cooling/heating lines beneath my Offy DP manifold? I am running headers.
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Old 07-15-2009, 12:41 PM
Kuskoal Kuskoal is offline
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it would be a good idea, even if you see 80*+ weather like me in nevada.
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Old 07-15-2009, 10:39 PM
Harte3 Harte3 is offline
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http://i144.photobucket.com/albums/r...Picture035.jpg

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Use 3/8-1/2 aluminum plate. A bit nicer job can be done using brass fittings rather than pipe fittings.

Running the water heat/coolant provides for better atomization and stabilizes temperatures in the induction system regardless of the weather.
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1983 F150 300 I6, Comp Cam 260h and lifter kit, Port/Polished head, Offy DP Manifold, Holley 4160/1848-1 465 cfm, EFI Exhaust manifolds, Walker Y Pipe to 3-Way Cat, generic Turbo Muffler, Recurved DSII, Mallory HyFire 6a & ACCEL Super Stock Coil, Taylor Spiro Pro Wires, EFI plugs.
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Old 07-16-2009, 01:41 AM
rikard rikard is offline
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I prefer the hot air system myself. Years ago I put on an after market header and intake eliminating the heat riser on a old AMC 258 I used a temperature controlled air cleaner to feed 80 deg air to the carb. Had no issues and I live in New England.
One of the mods that the GM LT1 boys like to do is to bypass the coolant to the TB to lower intake temps.
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Old 07-16-2009, 02:43 PM
Harte3 Harte3 is offline
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Either way the idea is to stabilize the intake temperature which carbs especially like. Easier to tune when reducing the temp variable.
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1983 F150 300 I6, Comp Cam 260h and lifter kit, Port/Polished head, Offy DP Manifold, Holley 4160/1848-1 465 cfm, EFI Exhaust manifolds, Walker Y Pipe to 3-Way Cat, generic Turbo Muffler, Recurved DSII, Mallory HyFire 6a & ACCEL Super Stock Coil, Taylor Spiro Pro Wires, EFI plugs.
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Old 07-16-2009, 03:51 PM
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'Old Man' Johnson of JMS Racing Engines drilled & tapped my Offenhauser 'C' Intake & connected it to my radiator system to provide heat.
Works real well too.
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Old 07-17-2009, 02:25 PM
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Will the plate fit if your using headers instead of the original split manifold?
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Old 07-17-2009, 06:07 PM
Harte3 Harte3 is offline
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The only way it does not fit is with the stock log exhaust manifold.
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1983 F150 300 I6, Comp Cam 260h and lifter kit, Port/Polished head, Offy DP Manifold, Holley 4160/1848-1 465 cfm, EFI Exhaust manifolds, Walker Y Pipe to 3-Way Cat, generic Turbo Muffler, Recurved DSII, Mallory HyFire 6a & ACCEL Super Stock Coil, Taylor Spiro Pro Wires, EFI plugs.
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Old 07-17-2009, 07:37 PM
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Harte3 did you use the dark ford blue on your engine? I'm painting mine and the color you used looks good.
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Old 07-18-2009, 12:48 PM
Harte3 Harte3 is offline
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My engine builder painted it...close enough to Ford blue for me.
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1983 F150 300 I6, Comp Cam 260h and lifter kit, Port/Polished head, Offy DP Manifold, Holley 4160/1848-1 465 cfm, EFI Exhaust manifolds, Walker Y Pipe to 3-Way Cat, generic Turbo Muffler, Recurved DSII, Mallory HyFire 6a & ACCEL Super Stock Coil, Taylor Spiro Pro Wires, EFI plugs.
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Old 07-31-2009, 10:22 PM
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Quote:
Originally Posted by Harte3 View Post
Use 3/8-1/2 aluminum plate. A bit nicer job can be done using brass fittings rather than pipe fittings.

A question - does the Offenhauser intake have a small chamber molded in at the base that the warm coolant collects in?
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Old 07-31-2009, 10:27 PM
F-250 restorer F-250 restorer is offline
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Yes, but it does not come with the plate and fittings to connect your heater lines to it. You have to make it yourself. Harte3 posted photos of the one he made for it.
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Old 07-31-2009, 11:14 PM
Goatzilla Goatzilla is offline
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Yeah, i figured that much out.

Just didn't know if the fittings on his plate terminated at the outside of the intake and just conducted heat through contact with the intake or if the intake actually had an uncapped 'resevoir' you could pump coolant into.

Thanks for the reply.
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Old 08-01-2009, 02:43 AM
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How is it sealed? Is it just RTV around the edges?
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Old 08-01-2009, 10:59 AM
Harte3 Harte3 is offline
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Yes but one could also make a gasket like what is used on a thermostat housing.
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1983 F150 300 I6, Comp Cam 260h and lifter kit, Port/Polished head, Offy DP Manifold, Holley 4160/1848-1 465 cfm, EFI Exhaust manifolds, Walker Y Pipe to 3-Way Cat, generic Turbo Muffler, Recurved DSII, Mallory HyFire 6a & ACCEL Super Stock Coil, Taylor Spiro Pro Wires, EFI plugs.
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