LS1 AND LS6?

042500HD · August 16, 2004

What is interchangable on the LQ4 and LS1 OR LS6? Heads and Intakes and different things like that. Also can you use superchargers and different horsepower boosters like N20 kits that are made for the LS1 or LS6's? Any help would be greatly appreciated thanks in advance

OUMike · August 16, 2004

LQ4 and LS1

these motors, as I understand it are NOT completely interchangeable.

LS1s and LS6s however are virtually the same motor.

042500HD · August 16, 2004

but can you interchange the heads and intake?

bigdogs · August 16, 2004

I wonder why they re-used an engine code as wasn't the LS6 (as well as LS7) the big blocks they put in vettes and Chevelles in the early 70's?

042500HD · August 16, 2004

yeah...thats funny big block & small block

Jhughes · August 17, 2004

whats up? brand new here. was wondering if anyone had tried a cylinder head swap 5.3 block with 6.0 aluminum heads? heard a rumor of possible valve to cylinder interference. not sure if this rumor is true or not. also if its benifical at all by itself or with a cam? any input would be greatly appreciated. Thanks

99Silver6.0 · August 17, 2004

whats up? brand new here. was wondering if anyone had tried a cylinder head swap 5.3 block with 6.0 aluminum heads? heard a rumor of possible valve to cylinder interference. not sure if this rumor is true or not. also if its benifical at all by itself or with a cam? any input would be greatly appreciated. Thanks

They will go on there. Dont know if it would be for the better as far as performance goes. The LQ4, LQ9 heads do flow really well though. If I remember right the 6.0 heads will decrease the compression too.

Jhughes · August 17, 2004

appreciate the feedback. would you know where i could get some more info on these heads?

99Silver6.0 · August 18, 2004

appreciate the feedback. would you know where i could get some more info on these heads?

www.ls1tech.com is the place to go man.

Jhughes · August 18, 2004

thanks. great link for info.

SoylentGreen · August 18, 2004

whats up? brand new here. was wondering if anyone had tried a cylinder head swap 5.3 block with 6.0 aluminum heads? heard a rumor of possible valve to cylinder interference. not sure if this rumor is true or not. also if its benifical at all by itself or with a cam? any input would be greatly appreciated. Thanks

Are the 5.3 heads not aluminum?

TarheelZ · August 18, 2004

I may be wrong but I think the only 5.3 with aluminum heads is the one in the SSR, the Buick Ranier, and the Envoy with 3 rows of seats.

SoylentGreen · August 18, 2004

I may be wrong but I think the only 5.3 with aluminum heads is the one in the SSR, the Buick Ranier, and the Envoy with 3 rows of seats.

Interesting, because mine has aluminum heads. They do have some part numbers stamped on them, I will have to check them out.

scooter70 · August 19, 2004

I think the '99s got iron heads and the later motors were aluminum. As far as interchangability, everything will bolt on LS1/LS1/4.8/5.3/6.0 but you have to watch the size of the combustion chamber and the resulting compression ratio. Lots of LS1 guys are bolting up 5.3 heads because they chambers are smaller and therefore increase the CR to ~11.0:1. (Plus they're cheaper and since they're going to port them anyway, the higher CR is a welcomed benefit.)

ChevyHiPerformance did a recent test on the truck, LS1, LS6, and FAST intakes. On a stock motor, the truck and LS6 intakes made more power than the LS1. However, the truck intake started to fall off as the motor flowed more air with a bigger cam and/or upgraded heads.

-Matt