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I trying to learn more about the internal engine. I had a question about heads, what they are used for, how much horsepower gain can they give you,etc... any info would help. Thanks.
Heads, Depending on which ones your get, can give around 35RWHP. Im sure it will vary from that number, but that is the round about number I have gotten from several shops.
Heads are along with the cam the most important power producing mod on a motor. NA of course.
May I suggest you read up on a motor configuration to know what they are and what they do.