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Old 09-02-2005, 03:11 PM
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sbc 350/400 heads help

Do sbc 350 heads fit on sbc 400 blocks? Got a sbc 400 for $800, but need to know if i have to get new heads or if i can throw my 350 heads right on. any reply is very helpful>
Projects: '77 Jimmy, w/350- soon to be sbc 400
'70 something sandrail- just frame and rear axle

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Last edited by Jwhite; 09-02-2005 at 03:23 PM.
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Old 09-02-2005, 05:10 PM
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Welcome. Be sure to read the new member posts at the top of each forum. Lots of good info including advice on posting questions in the proper forum for best exposure to the appropriate experts. I'll move this to the engine forum.
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Old 09-02-2005, 05:14 PM
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yes 350 heads will fit but you need to put a 400 head gasket up to it and drill a few small holes for the steam ..called steam holes..
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Old 09-02-2005, 05:28 PM
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yes they will fit
yes you need to drill steam holes
no they won't flow as well as 400 heads
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Old 09-02-2005, 10:45 PM
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Look up how to drill them online. It isn't easy. There are two different angles that you have to drill at. If you mess up your heads will be ruined.
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Old 09-02-2005, 11:20 PM
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Just drill the lower 3 holes. They go straight in. The upper three holes are on an angle. If you buy aftermarket heads they tell you not to drill the upper 3 holes. Because you have a real good chance of screwing up. The lower 3 holes are the important ones. Its where the steam builds up under the siamese casting.
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Old 09-04-2005, 05:56 PM
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Quote:
Originally Posted by bracketeer
Just drill the lower 3 holes. They go straight in. The upper three holes are on an angle. If you buy aftermarket heads they tell you not to drill the upper 3 holes. Because you have a real good chance of screwing up. The lower 3 holes are the important ones. Its where the steam builds up under the siamese casting.
Most morons can angle drill the holes pretty easily, I have.....

I said MOST not all.
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