[Steve C.]

I just noticed in my post #16 above I got the specs incorrect on the exhaust lobe for the SD Performance Old Faithfull cam. Sorry for any confusion.

Here are the correct numbers:

Lobe 3120B
306
245
161
.3830

The numbers in that post and here are direct from a friends Old Faithful cam card. He purchased it from Dave in 2008


.

[napster]

Originally Posted by jhein

As Steve C mentioned it's not exactly a copy of the OF. Different lobes and less lift. You could match the lift with 1.65 rockers though.

As far as how I like it, so far so good, but I don't have much driving time with it yet (winter). But, the idle is good. Smoother than I thought it would be, but enough lumpiness to know it's there (you can hear it in the youtube link in my signature). Good vacuum for brakes. Seems happy with casual driving at lower RPM. Very strong mid range. That's about all I can say so far.

Edit: I will say that if Cliff recommended it, I'd give that an awful lot of weight.

John,

I think what is holding back the idle is the X-pipe. I have changed all my cars to H-pipe. each car's idle was held back in terms of deep sound and the lope of the idle. In each case, it changed the sound to the way I want the car to sound like a muscle car.

Here are a before and after video of my 1970 GTO running a 461 with the off the shelf XR 288. It is the same cam you have except the LSA is 110.

Before:
https://www.youtube.com/watch?v=EoYVfvmtuX8
Exhaust is Magna Flow with X-Pipe

After:
https://www.youtube.com/watch?v=GYMaDAeOO3g&t=47s
Exhaust is now Flow Master American Thunder Series with Texas TA mufflers and H-pipe.

Big difference in sound.

[jhein]

Originally Posted by napster

John,

I think what is holding back the idle is the X-pipe. I have changed all my cars to H-pipe. each car's idle was held back in terms of deep sound and the lope of the idle. In each case, it changed the sound to the way I want the car to sound like a muscle car.

Here are a before and after video of my 1970 GTO running a 461 with the off the shelf XR 288. It is the same cam you have except the LSA is 110.

Before:
https://www.youtube.com/watch?v=EoYVfvmtuX8
Exhaust is Magna Flow with X-Pipe

After:
https://www.youtube.com/watch?v=GYMaDAeOO3g&t=47s
Exhaust is now Flow Master American Thunder Series with Texas TA mufflers and H-pipe.

Big difference in sound.

I remember that you mentioned that before. There's a big difference in sound for sure on the videos. When I bought my system, Pypes didn't have the H-pipe available. They don't even show it on their website right now, as far as I can find. I'll have to give them a call Monday.

[napster]

Originally Posted by jhein

I remember that you mentioned that before. There's a big difference in sound for sure on the videos. When I bought my system, Pypes didn't have the H-pipe available. They don't even show it on their website right now, as far as I can find. I'll have to give them a call Monday.

John,

I don't think Pypes ever offered the H-pipe. In fact, I'm having the last conversion done next week.

The last car being converted is one of my '78's with a 461. It has the pypes system on it right now with the x-pipe. My tech guy had a problem finding an h-pipe. It seems the industry is getting away from it. A person use to be able to get just the h-pipe section. In order to get the h-pipe now the entire exhaust system has to be purchased. Thankfully, my tech guy knew someone that had an h-pipe laying around and picked it up at the price that is a fraction of a full exhaust system.

[jhein]

Originally Posted by napster

John,

I don't think Pypes ever offered the H-pipe. In fact, I'm having the last conversion done next week.

The last car being converted is one of my '78's with a 461. It has the pypes system on it right now with the x-pipe. My tech guy had a problem finding an h-pipe. It seems the industry is getting away from it. A person use to be able to get just the h-pipe section. In order to get the h-pipe now the entire exhaust system has to be purchased. Thankfully, my tech guy knew someone that had an h-pipe laying around and picked it up at the price that is a fraction of a full exhaust system.

Hey Jim. Pypes definitely make/made H-pipes. Summit has some in stock and Pypes shows a system on their site as well. They just don't show it as an individual part. I'm gonna call tomorrow. Summit also sells a kit to make one. Maybe my guy can make one, I'll have to ask him.

https://www.summitracing.com/parts/p...bird/year/1970

https://www.pypesexhaust.com/product...-409-stainless

[napster]

Originally Posted by jhein

Hey Jim. Pypes definitely make/made H-pipes. Summit has some in stock and Pypes shows a system on their site as well. They just don't show it as an individual part. I'm gonna call tomorrow. Summit also sells a kit to make one. Maybe my guy can make one, I'll have to ask him.

https://www.summitracing.com/parts/p...bird/year/1970

https://www.pypesexhaust.com/product...-409-stainless

John,

Thanks for the information on Pypes. Didn't know they offered it. However, it still shows the only way to get it these days is as a full exhaust system.

If you can get your guy to make one and splice it into the existing system that might be the best way to go and get the sound you want. Also, it can be easier on the wallet.

I always kid around with my mechanic that when I have to pay for a project, I tell him I'm here for his weight reduction program. One would think weight would be taken out of the car to make it faster. Nope, it makes my wallet lighter. LOL. Happy New Year!!

[jhein]

Originally Posted by napster

John,

Thanks for the information on Pypes. Didn't know they offered it. However, it still shows the only way to get it these days is as a full exhaust system.

If you can get your guy to make one and splice it into the existing system that might be the best way to go and get the sound you want. Also, it can be easier on the wallet.

I always kid around with my mechanic that when I have to pay for a project, I tell him I'm here for his weight reduction program. One would think weight would be taken out of the car to make it faster. Nope, it makes my wallet lighter. LOL. Happy New Year!!

Yeah, I'm enrolled in a similar program.

Happy New Year to you too!

[jhein]

Originally Posted by napster

John,

Thanks for the information on Pypes. Didn't know they offered it. However, it still shows the only way to get it these days is as a full exhaust system.

If you can get your guy to make one and splice it into the existing system that might be the best way to go and get the sound you want. Also, it can be easier on the wallet.

I always kid around with my mechanic that when I have to pay for a project, I tell him I'm here for his weight reduction program. One would think weight would be taken out of the car to make it faster. Nope, it makes my wallet lighter. LOL. Happy New Year!!

Update: I called Pypes this morning and they have the H-pipe, they just don't list it for seperate sale. However, since I bought the system from them, they sold me the H-pipe. It's a direct replacement for the X-pipe so it should go right in.

[napster]

Originally Posted by jhein

Update: I called Pypes this morning and they have the H-pipe, they just don't list it for seperate sale. However, since I bought the system from them, they sold me the H-pipe. It's a direct replacement for the X-pipe so it should go right in.

John,

Thanks for the new information. Here are two more videos of my '78 with the 406. It runs two separate mufflers even in the video with the x-pipe.

First is the car with an x-pipe.
https://www.youtube.com/watch?v=DfOkesxdb7M

Second is the same car with only the x-pipe changed to an H-pipe. I taped this yesterday. The cam is the BOO HISS XE274H-10 flat tappet from Comp cam. I hear the lope in the second video a lot more than the first.
https://youtu.be/oP91rZkA84Y

I figured it might help to hear the difference on a second generation bird.

Jim

[jhein]

Originally Posted by napster

John,

Thanks for the new information. Here are two more videos of my '78 with the 406. It runs two separate mufflers even in the video with the x-pipe.

First is the car with an x-pipe.
https://www.youtube.com/watch?v=DfOkesxdb7M

Second is the same car with only the x-pipe changed to an H-pipe. I taped this yesterday. The cam is the BOO HISS XE274H-10 flat tappet from Comp cam. I hear the lope in the second video a lot more than the first.
https://youtu.be/oP91rZkA84Y

I figured it might help to hear the difference on a second generation bird.

Jim

Yeah, big difference in the videos. I'd guess even more in person. Thanks.

[napster]

Originally Posted by jhein

Yeah, big difference in the videos. I'd guess even more in person. Thanks.

No question about it.