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Re: how can i make power with a 4.2
To Mike B, This is what I did to my 4.2. Remove stock carb. intake and exhaust manifolds. Replace with 390cfm Holley carb. Model 4160 P/N 0-8007. Replace intake manifold with Offenhauser alum. intake P/N 6257-DP. Replace exhaust manifold with Pasesetter 6-2-1 header P/N 70-1128. This will solve some of your vacuum problems, give you more horsepower and better m.p.g. Parts for this project were about $900.00. The next phase of this project is going to be an ignition and coil upgrade probably M.S.D. These are a few things you might want to consider before you spend the big bucks on a new aluminum head. What the hell, swap the head too. Long live the 4.2.
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