Beating a dead horse : bronze vs PM
Thread Starter
On The Tree
Joined: Apr 2024
Posts: 129
Likes: 22
Thanks for all the great comments and experience.
I got a little impatient and impulsive and I did buy the Prc 225 heads from Texas speed.
I was unhappy with the quality and the 20% restocking fee is a JOKE. I think they wanted me to pay shipping too.
I won’t be doing business with TSP again.
I’ll be making a post about the low quality of their PRC heads, hopefully in a few weeks.
I got a little impatient and impulsive and I did buy the Prc 225 heads from Texas speed.
I was unhappy with the quality and the 20% restocking fee is a JOKE. I think they wanted me to pay shipping too.
I won’t be doing business with TSP again.
I’ll be making a post about the low quality of their PRC heads, hopefully in a few weeks.
Thanks for all the great comments and experience.
I got a little impatient and impulsive and I did buy the Prc 225 heads from Texas speed.
I was unhappy with the quality and the 20% restocking fee is a JOKE. I think they wanted me to pay shipping too.
I won’t be doing business with TSP again.
I’ll be making a post about the low quality of their PRC heads, hopefully in a few weeks.
I got a little impatient and impulsive and I did buy the Prc 225 heads from Texas speed.
I was unhappy with the quality and the 20% restocking fee is a JOKE. I think they wanted me to pay shipping too.
I won’t be doing business with TSP again.
I’ll be making a post about the low quality of their PRC heads, hopefully in a few weeks.
Sad. From what I've seen, their quality and consistency has gone downhill since they were sold several years back. Before the downward trend they had even purchased their own Landis (?) cam grinders, enabling in-house manufacturing and quality control over farming out everything. It takes many years to build a good reputation, and it can all go in the toilet in less than 1 year......
Thread Starter
On The Tree
Joined: Apr 2024
Posts: 129
Likes: 22
Any valve float ? What RPM do you set as a limiter ? I ask because I found and night a set of comp cams magnum rollers 1.8 ratio, too cheap to pass up and have almost no wear. So now my cam is more like .630 still in specs for the spring but I noticed the nose weight is about triple what the OEM and BRT rockers I already have. Not sure if I should get a .700 lift spring
Yeah, like going 20K miles on .660 springs with BR7 heads with bronze guides and T&D steel roller rocker arms. I have a set of 1207x springs to install on the heads and really need to get that done this year. Camshaft is a CamMotion 8620 core ground to 243/251 .661/.633 115+4 and the higher lift spring will be better suited for the heavier steel rocker arms.
Any valve float ? What RPM do you set as a limiter ? I ask because I found and night a set of comp cams magnum rollers 1.8 ratio, too cheap to pass up and have almost no wear. So now my cam is more like .630 still in specs for the spring but I noticed the nose weight is about triple what the OEM and BRT rockers I already have. Not sure if I should get a .700 lift spring
Any valve float ? What RPM do you set as a limiter ? I ask because I found and night a set of comp cams magnum rollers 1.8 ratio, too cheap to pass up and have almost no wear. So now my cam is more like .630 still in specs for the spring but I noticed the nose weight is about triple what the OEM and BRT rockers I already have. Not sure if I should get a .700 lift spring
Limiter is set to 7000 and I wouldn’t dare take it to even 6500 with those springs right now. I'm in the process of changing them out and have the passenger side left to do. I'll feel better about spinning it higher once the new springs are on there.
Thread Starter
On The Tree
Joined: Apr 2024
Posts: 129
Likes: 22
I am running TSP double .660 I believe they are 160lbs sounds like I need a shim or maybe just a .700 spring , somehow I got far away from my reliability / power goals hahaha
You should be ok w/ a PAC 1276x same as what I'm running, just shim them up to get the seat pressure up. I think that's a good combo, those rockers and that cam. If you can't get the seat pressure up to around 170-180, then look at a double. FYI, it's a snowball effect, more seat pressure means run a better lifter.
Thread Starter
On The Tree
Joined: Apr 2024
Posts: 129
Likes: 22
you drive it 20k with that set up already ? If I was rich I’d run it and Dyno it till float and see haha
r is set to 7000 and I wouldn’t dare take it to even 6500 with those springs right now. I'm in the process of changing them out and have the passenger side left to do. I'll feel better about spinning it higher once the new springs are on there.[/QUOTE]
r is set to 7000 and I wouldn’t dare take it to even 6500 with those springs right now. I'm in the process of changing them out and have the passenger side left to do. I'll feel better about spinning it higher once the new springs are on there.[/QUOTE]
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Verdad Gallardo Yeah, there's a big difference between cruising and racing. The car sees 5,000 from time to time and it runs alot better once you get up on the cam where there's less bucking a surging. Definetly not something that's super pleasant to drive in stop and go traffic but I deal with it.
@Tony @ Mamo Motorsports
Tony, as you know, I have run the gamut on my LS7 heads. Your advice is definitely what I've experienced. The new YT full rollers you sold me.....The wipe pattern is as close to perfect as you'll probably find. A rectangle about 1/8" wide, smack in the middle of, and all the way across the valve stem. This brings up an interesting point that has crossed my mind. Why did my guides dump? Thomson Automotive (now LPE in Wixom, Michigan), then AHP both ensured my guide to seat concentricity. Both did a good job, though I didn't check Thomsons work. I did check AHP's, and they did a good job, too. In fact, Kohle said whoever did them to start with (Thomson) did a good job. My only conclusion is the guide hardness is not consistent. This kind of showed up in the heads I sent to you, as 1 of the 16 was worn so badly......I've NEVER seen a guide so badly worn. Even on a half million mile 318 Dodge V8. In my 2 cents, guide hardness is but 1 thing that's at fault in this LS7 soup of trouble. The early, thin walled exhaust valves are another problem area. The third thing that is a problem is the CrN coating, or lack thereof. I don't mean to hijack, just saying a long (VERY!) thank you. I'm thinking your bronze guides with YT rockers will last me until I can't get in and out of the car anymore!!
Tony, as you know, I have run the gamut on my LS7 heads. Your advice is definitely what I've experienced. The new YT full rollers you sold me.....The wipe pattern is as close to perfect as you'll probably find. A rectangle about 1/8" wide, smack in the middle of, and all the way across the valve stem. This brings up an interesting point that has crossed my mind. Why did my guides dump? Thomson Automotive (now LPE in Wixom, Michigan), then AHP both ensured my guide to seat concentricity. Both did a good job, though I didn't check Thomsons work. I did check AHP's, and they did a good job, too. In fact, Kohle said whoever did them to start with (Thomson) did a good job. My only conclusion is the guide hardness is not consistent. This kind of showed up in the heads I sent to you, as 1 of the 16 was worn so badly......I've NEVER seen a guide so badly worn. Even on a half million mile 318 Dodge V8. In my 2 cents, guide hardness is but 1 thing that's at fault in this LS7 soup of trouble. The early, thin walled exhaust valves are another problem area. The third thing that is a problem is the CrN coating, or lack thereof. I don't mean to hijack, just saying a long (VERY!) thank you. I'm thinking your bronze guides with YT rockers will last me until I can't get in and out of the car anymore!!
you drive it 20k with that set up already ? If I was rich I’d run it and Dyno it till float and see haha
r is set to 7000 and I wouldn’t dare take it to even 6500 with those springs right now. I'm in the process of changing them out and have the passenger side left to do. I'll feel better about spinning it higher once the new springs are on there.
r is set to 7000 and I wouldn’t dare take it to even 6500 with those springs right now. I'm in the process of changing them out and have the passenger side left to do. I'll feel better about spinning it higher once the new springs are on there.
Have not run them yet, but will be on the road in about 2 weeks. Contact TurboBuick6, he is running way more aggressive cam than me and already has some time on it.