3timeracin

iTrader: (15)

I was wondering what results people have had with the TFS 245 or ET 265heads on big cube engines ? if you have them post your combo and any times ? I am primarly interested in hydraulic roller applications ?

racer7088

I have done engines that are mid nine second hydraulic roller pump gas deals with both. The ETP can go wilder with bigger spring pockets and more installed height as delivered so you can run some conventional springs too big for normal LSx type heads but both can make similar power as is. The TFS is always available and they have the best lead time if that matters as well. I love them both.

3timeracin

iTrader: (15)

Ya, I was thinking the same if you can run a regualr spring even though the head is more you save on the springs I ussually change springs every season and its hard to find a beehive or small diameter spring that will really handle the 680 lift cams I normally run and still be durable ? I also run more pressure than most on the L92 heads and the LS7 with stainless valve to compensate for the extra valve weight. Most springs are designed around a 2.05 or 2.08 valve and the L92 uses larger and the LS7 uses a +.100 long also ?