Thread: 355 sbc question about exhaust sound (need some help here!)

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Originally Posted by jerry clayton

Tie

I'm not much on U Tube videos for analizing sound of engines running as the recording capability and then my playing the sound over cheap PC moniter speakers don't do it justice----------but I will tell you what the change of the exhaust sound is the result of (in my opinion) and its hard for me to be forward and state this as the info about what is on your set up is difficult to believe ( I am not saying your fibbing) because I can't see it and you haven't proven it--------the sound change that your hearing is coming as a result of changing timing and mixture complicated by tuning length of exhaust headers as they reach tuned rpm length and same as you back out of it.

On a small block chevy, if the builder used roller rockers, he probably also upgraded the entire valve train to where it should easily be capable of 7000+ rpms------again , as your talking 5000 rpm I think some timing curve, carb tuning and utilizing tune length of the exhaust should make things sound better and rip on up to a much higher number.

could you go in more depth about what you mean by "the sound change that your hearing is coming as a result of changing timing and mixture complicated by tuning length of exhaust headers as they reach tuned rpm length and same as you back out of it." i dont understand what you mean by the tuning length of exhaust headers or what tuned rpm length is.
also about the rpm issue, it may be able to go higher then the 5000 i shift at. I have never been in or around another car like mine in real life so i have no idea what it should feel like when driving. I was just always afraid to go higher then 5000 rpm because of 2 things. 1 the tach red zones there (now that tach is for the stock 305 that would have been in it) and 2 its sound and feeling changed when you got to that higher rpm. its hard for me to explain but thats the best i can do. and on top of all that im the one tuning the carb because the only garage around me says that they don't know how. and because i self teach i took what i knew about some engines and some info i got from the web and did the best i could to tune it.
thanks
tie