[TCSGTO]

Originally Posted by Chris-Austria

Regulations over here don't allow such tires on the street, so I'm using 255 60 15 BFGs. They look good... thats it

I have following options on the Butler website:

1. 236/242, .521/.540, 112 LS

2. 236/242, .521/.540, 114 LS

I guess I'd go with the larger LS for a better idle. My old cam has 224/230, .503/.510, 110 LS. Butler sent me these valve springs: https://www.summitracing.com/parts/lun-73100-16
Could I keep them or should I change them? (I guess change since 333 lbs./in. seems too low)

Maybe I could also install a torqer 2 intake and match it to the heads.. not sure if there is a lot to gain over the performer rpm...
I also think my 2.5" dual exhaust with FlowFx mufflers (like the Magnaflows) may be not be perfect, but changing to 3" will not make too much of a difference to justify an investment of another 1500 $.

You’re exhaust system is good enough, it wouldn’t be a very good investment to change it at this point.

Same thing if you have the RPM intake, they’re tough to beat on a street engine. Find a used TII to save some $ if you want to experiment. There are tons of them out there. Having run both on the same 455 I honestly couldn’t really feel much difference at all between the 2 on the street in power or driveability though.

The 236 duration HR cams seem to be the sweet spot for a 455 street engine. A properly chosen one could make more power everywhere compared to what you have now and may make traction even worse.

Before swapping a bunch of parts maybe try a taller wider 275/60/15 tire if you have room? They’ll cut down overall gearing and should give a little more bite.

On the bright side having more power than you can use and trying to harness it is a much better problem than not having enough!