I just wanted to run this by you guys to see if you have any thoughts on the subject. My 68 mustang recently got performance upgrades. I had a blown head gasket so decided to upgrade the heads to new edelbrock e-street heads and in install the matching edelbrock cam also. I had an over heat problem so there was question about steam holes being drilled but that is another thread on here. But car went back in the shop about the holes so have not driven it but a couple of times since upgrade. And here is my question…….
I don’t think it sounds right when running. At idle it does have a good throaty smooth idle sound with just enough variation to tell the cam is there. At least I assume it’s the cam. But under acceleration it has more of a putt putt sort of sound. Plus I think it sounds like what I think a very large exhaust leak would sound like. Sort of like if you could hear exhaust hitting against something. I thought it would probably sound more like the high rpm smooth acceleration sound in the dodge challenger commercial. That sound that makes you think of power. The car is also much louder inside now than it was before, I would say twice as noisy.
The mechanic says I do have a cracked exhaust manifold, which he tried to weld up, and says it’s not very big. I had no crack there before the work as far as I know. I have a 302 engine with 289 innards with the edelbrock heads, cam and performer intake with 500 cfm edelbrock 4v on it. Stock cast iron headers with fairly new dual flowmaster exhaust.
they did find that the plugs were wrong, too short, when they pulled a head back off to check for the steam holes. Correct plugs are being installed. Could the plugs have made it sound like a putt putt? Or could it be timing or mixture? If timing is wrong I hear that can cause over heating or if mix is to lean also.
I have just put over $3000 into this car and have not been able to use it and it is back in the shop again. Hopefully will be back out this week and I can then tackle the heat issue if it still has one. I will post the heat issue as a separate thread. Thanks for any and all input.
I don’t think it sounds right when running. At idle it does have a good throaty smooth idle sound with just enough variation to tell the cam is there. At least I assume it’s the cam. But under acceleration it has more of a putt putt sort of sound. Plus I think it sounds like what I think a very large exhaust leak would sound like. Sort of like if you could hear exhaust hitting against something. I thought it would probably sound more like the high rpm smooth acceleration sound in the dodge challenger commercial. That sound that makes you think of power. The car is also much louder inside now than it was before, I would say twice as noisy.
The mechanic says I do have a cracked exhaust manifold, which he tried to weld up, and says it’s not very big. I had no crack there before the work as far as I know. I have a 302 engine with 289 innards with the edelbrock heads, cam and performer intake with 500 cfm edelbrock 4v on it. Stock cast iron headers with fairly new dual flowmaster exhaust.
they did find that the plugs were wrong, too short, when they pulled a head back off to check for the steam holes. Correct plugs are being installed. Could the plugs have made it sound like a putt putt? Or could it be timing or mixture? If timing is wrong I hear that can cause over heating or if mix is to lean also.
I have just put over $3000 into this car and have not been able to use it and it is back in the shop again. Hopefully will be back out this week and I can then tackle the heat issue if it still has one. I will post the heat issue as a separate thread. Thanks for any and all input.