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Offenhauser DP to Clifford heating difference.

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F-250 Restorer
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Offenhauser DP to Clifford heating difference.

Post #1 by F-250 Restorer » Sun Jul 14, 2019 11:35 am

I changed from a Offy DP to a Cliff. intake. Both have the engine coolant flowing through them. I changed the intake and engine a couple of months ago, so I've been playing with/adjusting the choke to get it right. However, with the Cliff. intake, using the same holley carb as was on the Offy, I find that I have to warm up the engine for five minutes or it wants to die when I try to accelerate. With the Offy there was no problem. Once the engine is warm, it runs well.


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Re: Offenhauser DP to Clifford heating difference.

Post #2 by BigBlue94 » Sun Jul 14, 2019 7:40 pm

I've never had that problem with my Clifford. As far as I know, the Offy is built to use the factory manifold type of heat, whereas the Clifford has a long water jacket on the bottom of the manifold.

Did you readjust the carb due to the difference of the DP and the open Clifford?
1985 Bronco. 309ci I6, NP435, 4.56 gears, Detroit locker and tru-trac, 4" lift, and 37" swamper tires. The 309 is 9.75:1 CR with a Schneider 140H cam, 4bbl, roller rockers, larger valves, and headers.

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Re: Offenhauser DP to Clifford heating difference.

Post #3 by jason832 » Sun Jul 14, 2019 8:48 pm

I was going to suggest carb tuning as well. My Clifford doesn't seem to make a difference with or without water heat, very small if at all.

Maybe it needs a fast idle?

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