I'm doing a 4l80 swap in my silverado 1500 which had a 4l60, are these bolts the correct length to go through my flex plate and it's spacer?

I used these in a tci flexplate conversion for th350/th400 also using converter spacer and they worked perfectly

will these fit the LSA crankshaft and flexplate without a spacer?

The LSA crankshaft is an 8 bolt so you'll need to buy 2 sets and it fit on my LSA in my 09 CTS v with no issues

Are these bolts a replacement or upgrade to gm performance flexplate bolt gm ls-series part number 19257940?

They are both! They replace factory LS flexplate bolts. I have a turbo 6.0 LS and it will destroy factory bolts on a good launch and these arp bolts have been in about a year and have not let me down yet

Will these fit a 2006 gmc sierra 1500 with the 5.3? I only have 3 bolts

These bolts goes from the flex plate to the crank.The three bolts goes from the flex plate to the torque convertor if these 3 you need,you may try this number ARP 230-7304.Hope this helps.Good luck.

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ARP2442901 Pro Series Flexplate Bolt Kit for Gen II/LS Series Small Block Chevrolet

ARP2442901 Pro Series Flexplate Bolt Kit for Gen II/LS Series Small Block Chevrolet

Product ID: 197828955

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Description

ARP 244-2901 Thread size: M11 x 1.5 3/4 inch wrenching ›See more product details

ARP2442901 Pro Series Flexplate Bolt Kit for Gen II/LS Series Small Block Chevrolet

Specifications

Manufacturer	ARP
Brand	ARP
Item Weight	6.7 ounces
Item model number	2442901
Is Discontinued By Manufacturer	No
Exterior	Black Oxide
Manufacturer Part Number	2442901
OEM Part Number	244-2901

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