4 barrel
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Freshman User
Joined: Jan 2006
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4 barrel
does any one have a offy or a clifford 4 barrel intake manifold and possidley a carb they would like to sell.and does any one know if the intake and headers make a huge difference,i just ordered a set ok hedman headers are they any good.
Elder User
Joined: Feb 2004
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From: Indiana
I have not installed mine yet. I traded a gas tank for the clifford that I have. The motor I have needs rebuilt (brokem piston on the #2 cylinder) before I can put it on. The 390 holley works really well with the Clifford and Offenhauser intakes. The offenhauser dual port intake works a little better on the lower rpm's but both will help with performance. A 500 cfm could be a bit much for a 300. I know there has been some that have put on a 500 cfm 2 barrel.
Senior User
Joined: Feb 2005
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I have a water heated Clifford 4 barrel intake with a Holley 390 and Clifford's 2 1/2" collector shorty headers. For my stock motor, this was a HUGE power increase. Of course, the stock stuff I took off is original to my '77 truck, and they leaked, burned out gaskets, etc. I love the new set up, especially on the highway when I punch it and the secondaries and power valve kick in. I never thought my old truck would come back to life like this!
IMO, without improving the internals in your motor, 500cfm would be too much. From everything I read before I decided on my setup, the 390 has the capacity to deliver the fuel mix that a stock motor would need under the heaviest conditions.
You can have my leaky old stock manifolds! :P
IMO, without improving the internals in your motor, 500cfm would be too much. From everything I read before I decided on my setup, the 390 has the capacity to deliver the fuel mix that a stock motor would need under the heaviest conditions.
You can have my leaky old stock manifolds! :P
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