Captdistraction
Not the Stig
- Joined
- Sep 3, 2016
- Threads
- 21
- Messages
- 202
- Reaction score
- 35
- Location
- Phoenix
- Website
- www.facebook.com
- First Name
- Chris
- Vehicle(s)
- 2016 mustang GT350 Tech Pack, 2011 Mustang Racecar, 2011 Raptor
- Thread starter
- #1
Background, my gen2 aluminator 5.0 NA (boss 302 topend) in my S197 racecar spat out its crankshaft.
I'm now having to rebuild and during the process, the boss 302 cnc cylinder heads are harder to come by. that all said, the S550 GT head is plentiful, but my tuner said to look at the b302 heads if at all possible. I have a goal of revving to 7800rpm (and an ideal shift point around 7600). I've had setups go as far as 8300rpm but for competition use I'd like to leave some margin and classing rules now penalize that last 500rpm.
My concerns are that it uses the same upgraded valvespring, but has a larger and heavier valve on both intake and exhaust. I'm worried if the head can keep up without float, and how the heads themselves fare for 1 hour race sessions. I have to drive the car real hard to compete in my region and on the national level, but I have a budget.
Who here runs these S550 cars hard? What's the feedback? Each s550 head is $500, and the boss heads $1200.
I'm now having to rebuild and during the process, the boss 302 cnc cylinder heads are harder to come by. that all said, the S550 GT head is plentiful, but my tuner said to look at the b302 heads if at all possible. I have a goal of revving to 7800rpm (and an ideal shift point around 7600). I've had setups go as far as 8300rpm but for competition use I'd like to leave some margin and classing rules now penalize that last 500rpm.
My concerns are that it uses the same upgraded valvespring, but has a larger and heavier valve on both intake and exhaust. I'm worried if the head can keep up without float, and how the heads themselves fare for 1 hour race sessions. I have to drive the car real hard to compete in my region and on the national level, but I have a budget.
Who here runs these S550 cars hard? What's the feedback? Each s550 head is $500, and the boss heads $1200.
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