Replacement valves for 2GR-FE

[NorCalEmira]

Thank you for the info. My objective is to maintain it as my daily, tune up to 500BHP (not over) and push the RPMs to 7600-7800, as long as I'm replacing valves, is there any benefit to doing a more performance based head swap?

You'll have to remove the heads just to replace the valves and valve springs. You could order a set of heads from Jubu or MWR that have been ported and have the performance valve train installed. Provided that your heads haven't been damaged, you can exchange them to avoid the core charge with both vendors. In either case, you'll need a tune to increase the rev limit beyond the factory 6800 RPM limit. I think it would be worth having the porting work done given the amount of disassembly and reassembly that is required with any of the alternatives but you could save some money by just having your mechanic rebuild the stock heads with the new valve train.

 

[Blue Dude]

 

[speropagos]

The 2GR platform is stout from the factory and capable of delivering an exceptionally long service life. These motors have a forged crank, forged rods and 6 bolt main bearings from the factory.

The pistons are cast so that's really the achilles heal if you add too much power or boost on top of the factory 10.5:1 compression. Jubu claims that the pistons are susceptible to breakage when they've tested tunes that delivered in excess of 500NM of torque so it's interesting to hear Greg's experience. There are plenty of stories online about twin turbo 700-800 HP 2GR's with the stock block and crank but new forged rods and pistons so there's a ton of potential if you have the funds and that's how the Jubu short block comes for those that want to build the motor to that level.

I think the original poster has the right idea for his situation. If you have to pull and rebuild the heads anyway, why not exchange your cores for new heads that have been ported and built with a high performance valve train to support higher RPM's. Seems like a natural without breaking the bank.

If valves are in fact bad, and pistons/cylinders look ok, should I be concerned about undetectable stress on other components not getting replaced? I plan to do a VERY mild HP tune, and mostly want to increase rpms to the 7600-7800 range.

 

[NorCalEmira]

If valves are in fact bad, and pistons/cylinders look ok, should I be concerned about undetectable stress on other components not getting replaced? I plan to do a VERY mild HP tune, and mostly want to increase rpms to the 7600-7800 range.

You'll learn a lot from the removal and disassembly of your factory cylinder heads. This disassembly will be required to fully assess the scope of damage. Once your mechanic understands just how extensive the damage was to your heads and engine(with the heads off), he'll be in a better position to provide guidance on potential damage to the cylinder bores from broken valves (if any), etc. I saw that he's already done some preliminary exploration with a scope which I assume has come back with a negative (no damage detected) result. There's a good chance that you won't have any such damage and that your cores will be fully reusable but you won't know for certain until this step is taken. I wouldn't be concerned about undetectable damage if everything checks out post disassembly. The video above from @Blue Dude speaks to the potential gains of cylinder head porting even at lower revs BTW.