# LT1 guys, need some help.

**URL:** https://forums.speedlife.net/t/lt1-guys-need-some-help/187600
**Category:** PittSpeed Automotive
**Created:** [January 23, 2007, 2:58pm UTC](https://forums.speedlife.net/t/lt1-guys-need-some-help/187600 "2007-01-23T14:58:26Z")
**Posts on this page:** 1
**Showing post:** 17

<div class="post-metadata">

### Author: ![Spyderking69](https://avatars.discourse-cdn.com/v4/letter/s/9dc877/32.png) [@Spyderking69](https://forums.speedlife.net/u/Spyderking69)
#### Post date: [January 27, 2007, 4:25pm UTC](https://forums.speedlife.net/t/lt1-guys-need-some-help/187600/17 "2007-01-27T16:25:47Z")

</div>

[quote=“eurodad,post:6,topic:27570"”]

503\>305

[/quote]

maybe in a manual car, but not in a stock auto LT1. the 503’s powerband doesnt kickin until 1800rpm, where as the 305 hits at 1500. If you have an auto, with a stock TC, the 305 hits right where you stall at. other than that and the 4deg seperation in duration they are exactly the same

---

_[View the full topic](https://forums.speedlife.net/t/lt1-guys-need-some-help/187600)._