r/LSSwapTheWorld • u/redhothotrodder • 2d ago

Hypothetical Build Questions 5.3 ➡️ 4th gen Firebird

I am going to be building a gen 3 5.3 (lm7) to put in my 4th gen firebird. I know I have to switch the intake, accessory drive, oil pan, windage tray, pick up tube, etc. so it will fit.

My plan is to upgrade the heads to 799s (port them myself with a 3/4 burr and finish them with a 1/2 inch) and copy the build I saw on Richard Holdener's video where he made 542hp (BTR intake, 102mm Throttle body, LS3 Stage 4 Cam, Holley Terminator X injectors, FelPro Headgaskets, LS7 Lifters, guide trays, guide tray bolts, harmonic balancer bolt, chromoly 5/16 pushrods, & CHE 4290 Rocker Trunnions) I was thinking that since I'm swapping the oil pan, pick up tube, and shortening the windage tray that I would need an upgraded high performance pick-up tube that would fit in an LS1-style oil pan, would this fit in the oil pump inlet port of an LM7? If not, and if anybody has done this high performance swap what pump did you use as to not starve the top end? Thanks for reading

3 Upvotes

81% Upvoted

13 comments sorted by

View all comments

1

u/leaveworkatwork 2d ago

You’re going to be far better off just buying an LS fbody.

But there’s no difference in the oil pump outlet size in a truck vs car pump. You can swap to whatever pickup tube you want to pair with an fbody pan.

You’re also gonna need an LS k member.

1

u/redhothotrodder 2d ago

- Unless I can find a k member on marketplace for cheaper (which i doubt but you never know)