Valvetrain for Boosted LT1s
06-29-2016, 10:14 AM
#1
Valvetrain for Boosted LT1s I'm starting to see more and more boosted lt1 guys posting these days. So what valve springs are you guys using? The shop tuning my car suggested I get some valve springs with .650 lift because they noticed valve float by 5900 rpms. They particularly mentioned BTR's (Brian Tooley) springs. Is anybody running his springs? What are you guys using for rockers?
07-01-2016, 03:32 PM
#4
Thank you.
I just put in an order with Brian Tooley for his springs good for .650 lift.
Now I am hoping my rockers are up to the task
My engine builder put some stainless 1.6 PEP brand roller rockers, NSA, 7/16 studs in and said they are comparable to pro mags. But I have my doubts now.
I just put in an order with Brian Tooley for his springs good for .650 lift.
Now I am hoping my rockers are up to the task
My engine builder put some stainless 1.6 PEP brand roller rockers, NSA, 7/16 studs in and said they are comparable to pro mags. But I have my doubts now.
07-01-2016, 09:58 PM
#6
Thank you.
I just put in an order with Brian Tooley for his springs good for .650 lift.
Now I am hoping my rockers are up to the task
My engine builder put some stainless 1.6 PEP brand roller rockers, NSA, 7/16 studs in and said they are comparable to pro mags. But I have my doubts now.
I just put in an order with Brian Tooley for his springs good for .650 lift.
Now I am hoping my rockers are up to the task
My engine builder put some stainless 1.6 PEP brand roller rockers, NSA, 7/16 studs in and said they are comparable to pro mags. But I have my doubts now.
Trending Topics
07-02-2016, 02:45 PM
#13
I had Ultra Promags but the bodies were too big to clear the retainers/springs on my heads so I switched to Harland Sharps.
I ended up with PSI max life duals and titanium retainers on my AFR heads. The valves are longer and different diameter than stock so getting the right parts was a little tricky. Should be 170 seat 400 open with the LE 226/239 cam.
I ended up with PSI max life duals and titanium retainers on my AFR heads. The valves are longer and different diameter than stock so getting the right parts was a little tricky. Should be 170 seat 400 open with the LE 226/239 cam.
07-02-2016, 05:04 PM
#15
Good to see other LT1 owners with BTR springs, I see they're very popular with the LS1 crowd.
Reading my cam specs from my engine builder, it states that both my intake and exhaust max valve lifts are .606. What I am not clear on is, do the BTR springs at .650 lift simply provide a buffer safety zone? Or is my cam undersized for the springs? My tuner said the car wanted to keep boost climbing but as stated earlier, hit valve float at 5900 rpm. I am running AI ported Trickflow 215 heads and a Vortech T trim. Hoping for at least 12-15 psi of boost. But have only seen 10 psi so far. I'm assuming this is due to the valve float???
Reading my cam specs from my engine builder, it states that both my intake and exhaust max valve lifts are .606. What I am not clear on is, do the BTR springs at .650 lift simply provide a buffer safety zone? Or is my cam undersized for the springs? My tuner said the car wanted to keep boost climbing but as stated earlier, hit valve float at 5900 rpm. I am running AI ported Trickflow 215 heads and a Vortech T trim. Hoping for at least 12-15 psi of boost. But have only seen 10 psi so far. I'm assuming this is due to the valve float???
07-02-2016, 11:30 PM
#16
Good to see other LT1 owners with BTR springs, I see they're very popular with the LS1 crowd.
Reading my cam specs from my engine builder, it states that both my intake and exhaust max valve lifts are .606. What I am not clear on is, do the BTR springs at .650 lift simply provide a buffer safety zone? Or is my cam undersized for the springs? My tuner said the car wanted to keep boost climbing but as stated earlier, hit valve float at 5900 rpm. I am running AI ported Trickflow 215 heads and a Vortech T trim. Hoping for at least 12-15 psi of boost. But have only seen 10 psi so far. I'm assuming this is due to the valve float???
Reading my cam specs from my engine builder, it states that both my intake and exhaust max valve lifts are .606. What I am not clear on is, do the BTR springs at .650 lift simply provide a buffer safety zone? Or is my cam undersized for the springs? My tuner said the car wanted to keep boost climbing but as stated earlier, hit valve float at 5900 rpm. I am running AI ported Trickflow 215 heads and a Vortech T trim. Hoping for at least 12-15 psi of boost. But have only seen 10 psi so far. I'm assuming this is due to the valve float???
07-03-2016, 07:37 AM
#17
Good to see other LT1 owners with BTR springs, I see they're very popular with the LS1 crowd.
Reading my cam specs from my engine builder, it states that both my intake and exhaust max valve lifts are .606. What I am not clear on is, do the BTR springs at .650 lift simply provide a buffer safety zone? Or is my cam undersized for the springs? My tuner said the car wanted to keep boost climbing but as stated earlier, hit valve float at 5900 rpm. I am running AI ported Trickflow 215 heads and a Vortech T trim. Hoping for at least 12-15 psi of boost. But have only seen 10 psi so far. I'm assuming this is due to the valve float???
Reading my cam specs from my engine builder, it states that both my intake and exhaust max valve lifts are .606. What I am not clear on is, do the BTR springs at .650 lift simply provide a buffer safety zone? Or is my cam undersized for the springs? My tuner said the car wanted to keep boost climbing but as stated earlier, hit valve float at 5900 rpm. I am running AI ported Trickflow 215 heads and a Vortech T trim. Hoping for at least 12-15 psi of boost. But have only seen 10 psi so far. I'm assuming this is due to the valve float???
.