5.3Caprice

iTrader: (2)

I have a 2008 HUMMER H3 Alpha (LH8 5.3) and I'm looking for more power. I also have an F-body LS1 sitting in my shed collecting dust. I would like to install the LS1 in the H3 but I am unsure of a few things and I'm hoping someone can help me out.

I know I would have to change the 24x wheel on the LS1 crank to a 58x wheel and swap the front cover from the LH8 to the LS1 and use the proper cam sprocket. I would also have to install the LH8 knock sensors onto the LS1 block.

Does anyone know if I can put the Gen IV LH8 heads on the LS1 block?

While everything is apart, I would also install do a cam swap.

I know this is kind of backwards (2001 engine in a 2008 truck) but there's no replacement for displacement and I have the 5.7 just sitting around. Also, the LS1 has less miles on it than the LH8.

brewster240

iTrader: (1)

better off putting some work into the 5.3

audacious nick

Actually, there is a replacement for displacement: it's called forced induction.

chuckd71

iTrader: (23)

.4 L difference in and of itself probably won't matter that much will it? Certainly not enough to make it worth the expense and effort to put it in a hummer. If you are going to do it you might as well do it right and use a better motor. A turbo seems like a more sensible option.

5.3Caprice

iTrader: (2)

I really don't want to use forced induction. I may do a cam only in the 5.3 and wait until I can afford a larger Gen IV engine. I'm just thinking about the LS1 because (if it works) I have the parts on hand.

Bo185

That's alot of work to get the LS1 to work changing the reluctor wheel and all for a small gain. Sell the LS1 and put that toward a LY6 6.0L or a 6.2L L92. The LY6's are pretty affordable. All you would need is the long block with intake. Then just delete the VVT on the new motor. And a cam.

brewster240

iTrader: (1)

what year ls1 is it?

if its a late one, might be worth it if you like a lot of work for minimal gains

if its early, you probably wont gain anything. (97,98)

narx66gmc

cam, intake, exhaust and a good tune would cost u $1500-1800+/- and gain more than the $ it'd cost to swap... or, just spend $800 on nitrous...

rotor vs. piston

iTrader: (3)

can't imagine .4L is worth it. Maybe if you built the LS1 to be some sort of monster before the swap :shrug:

5.3Caprice

iTrader: (2)

I'm not doing any forced induction and I want to stick with an aluminum block.

Brewster - I think it's an '00.

As usual, you guys are right. I last looked up prices on 6.0/6.2 aluminum block engines about a year and a half ago. I just did some more research and the prices have dropped significantly. I could sell the LS1 and be a 1/3 of the way to an L92.

Thanks to everyone for the advice. I still think the LS1 would be a neat swap, but I don't have THAT much free time. :-) And a cam swap in the stock 5.3 would probably come close to the same amount of time as just swapping the entire engine.

brewster240

iTrader: (1)

im interested in the 5.3 when you pull it, and im somewhat close to Northeast Pennsyltucky

5.3Caprice

iTrader: (2)

I think I may try installing the 5.3 in my H3T 5-cylinder. Interested in an LS1? 53K miles. Complete with accessories, harness, and computer. $1200

silverxhaze1007

@ 5.3 Caprice-I am definitely interested in that LS! please contact me if still for sale. Thanx!

Pocket

iTrader: (22)

You are correct on the parts needed to be swapped over

Easiest way to get a 58x reluctor in the LS1 is to swap cranks with the 5.3

The 5.3's heads will most likely be 799's which are equivalent to LS6 heads. They will bolt onto the LS1 and be a nice upgrade

On the other hand, a mild cam and headers would put you over a stock LS1 with alot less effort than a swap