Thread: SBC 400 needs to wake up a bit

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You'll have a lot less hassle if you find a Q-jet off a 400. Jetting on a 425 is probably off enough to cause some poor running qualities. It might not, but tuning it could be frustrating. 400's are common enough in the wrecking yards, most have 4-bbls. If you want to go the cheapest route, grab the intake too. At stock 400 revs, there will be little difference in power compared to an aluminum intake, and it may even run better, especially when the engine is cold in the morning.

Well today i got motivated and began the swap. I found a performance edelbrock aluminum intake on craigslist five minutes from my house for 50 bucks. Pulled the two barrel manifold and carb, cleaned up the gasket surfaces, installed new gaskets and the manifold. I am going to put the carb on tomorrow. If the Rochester Quadrajet does not work, i will find one from a 400. There seems to be a lot of quadrajets on craigslist. Any thoughts/opinions on the performance manifold? I have been a diesel man all my life so i am new to these gas motors. So far i love them tho