Forum: Performance Modifications

Looking for positive input on this motor. Going to be a daily driver for one of my 2 trucks in the future, I want to get maybe 30 or so more...

Hello guys I own a 4.8 2002 sierra and I planing in entering it in the drag in a couple of months.I'm hopping to get it to 9-10 seconds. Current...

I've already got 4.11 gears and a 2800-3000 stall. so what would be a good sounding cam.

i need to put new head gaskets on a 1994 350 3/4 ton chevy and was wonderin, since it is a 94 and pre-OBDII can i pop a cam in a run it or will i...

Im building a mild LQ4 for a work truck that will see some moderate towing. All I plan to do as of now is add some lightly ported 243 heads, Comp...

i see the 243 heads talked about alot on here just wondeing whats so good about them and i have a set of 862 heads gitting hand ported and flow...

Anyone have any experience with true duals and the corsa universal mufflers? I'm running race bullits right now. I drove the truck about 400mi last...

I've heard that a 4.8/5.3 block can be taken all the way up to a 383 - 3.905" bore and 4.000" stroke. Is this correct?

I dropped an lq4 in my truck a while back. It has a Nelson tune with 42# injectors intake and a true duel exhaust. It has 3.73 in both the rear and...

Where can I get some long tube headers for my 03 silverado 4.8

Ok guys ive noticed that some guys (including one of my friends with a cummins) are starting to run longbars rather than caltracs. I plan on building...

Im going to be installing a set of P/P 243 heads milled .040 on my stock 5.3l bottom end ,to run while i build the LQ9. Cam is a Lunati voodoo...

ok cats outta the bag.. i just placed an order on a block to build a 408 for the SS. anyone think im gonna need bigger injectors? i got 42lbers in...

I've heard about it, ordered one off of Ebay for $15 shipped and it took me about 45 minutes to install. It definately makes a difference. Now under...

if so what brand? anyone know if F-body headers will work, i have heard that some will and some wont,

Does anyone have one? I'm looking for something LOUD at WOT that has no drone. I don't want to jump on the Magnaflow bandwagon but cannot stand...

Guys, I need a new set of valve seals for my 243 heads. Anyone know the GM part number for these particular seals?

Efans on a yukon good or bad idea?

Just got rid of my favorite short wide bed chevy (2000) for a 09 GMC Sierra 2WD 5.3L. After looking up the vin I found out the engine is a LY5. ...