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425 hp LT4 ??vonmoldy 09-05-2004, 05:57 PM Does anyone have any experience with the GM performance LT1 to LT4 conversion package? In summite racing catalog it says it's worth 425??! Is that what the maximum i is capable of? All info will be a help. I am looking for a HP figure with this upgrade. THANKS!! teke184 09-05-2004, 06:07 PM from everything i've seen it is quite the exageration. i think with a very hot tune, you could maybe get it up to 400 at the crank...like 340-350 at the wheels. there are much better heads/cam setups for much better power. a good set of ported LT1 heads and a above average cam will make 400 to the wheels i think madwolf 09-05-2004, 06:38 PM from everything i've seen it is quite the exageration. i think with a very hot tune, you could maybe get it up to 400 at the crank...like 340-350 at the wheels. there are much better heads/cam setups for much better power. a good set of ported LT1 heads and a above average cam will make 400 to the wheels i think 425 HP in an automatic with an 18% loss coefficient is 348 to the wheels. In a manual with a 14% loss, it is about 365. I think it's very doable, but you'd have to have long tube headers and a good tune. unvc92camarors 09-05-2004, 07:14 PM yea, i heard they used a very very capable tuning machine to get those numbers at the crank, not the wheels i would also suggest getting a good heads/cam package and blow that lt4 conversion away teke184 09-05-2004, 07:29 PM Ion, i guess those numbers do look reasonable...it just seems that nobody is ever happy with the results from their kits. seems like i see 330-40 all the time... | ||