89comanchekitch Posted March 11, 2019 Share Posted March 11, 2019 I am rebuilding an 89 Comanche with a 4.0 straight six. The engine is getting built from the ground up(middle of the process now), and i need help with header/ exhaust tube size. It's bored 60 over with a comp cam and the goal is trail rig. What would be ideal size for max horse and healthy for the engine? thanks! Link to comment Share on other sites More sharing options...
SatiricalHen Posted March 11, 2019 Share Posted March 11, 2019 I am rebuilding an 89 Comanche with a 4.0 straight six. The engine is getting built from the ground up(middle of the process now), and i need help with header/ exhaust tube size. It's bored 60 over with a comp cam and the goal is trail rig. What would be ideal size for max horse and healthy for the engine? thanks! My engine is similar except it’s only .030, with a few intake and fuel mods. Everyone suggested staying stock 2.25” exhaust for my truck. Sent from my iPhone using Tapatalk Link to comment Share on other sites More sharing options...
SatiricalHen Posted March 11, 2019 Share Posted March 11, 2019 What head and intake do you plan to use?Sent from my iPhone using Tapatalk Link to comment Share on other sites More sharing options...
Jeep Driver Posted March 11, 2019 Share Posted March 11, 2019 27 minutes ago, SatiricalHen said: My engine is similar except it’s only .030, with a few intake and fuel mods. Everyone suggested staying stock 2.25” exhaust for my truck. Sent from my iPhone using Tapatalk Not everyone. Link to comment Share on other sites More sharing options...
89comanchekitch Posted March 20, 2019 Author Share Posted March 20, 2019 I was planing on running the stock intake and I have a new stock head Link to comment Share on other sites More sharing options...
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