4.8 liter ??????
03-22-2009, 04:33 PM
#1
Teching In
Thread Starter
Join Date: Feb 2009
Posts: 9
Likes: 0
Received 0 Likes
on
0 Posts
4.8 liter ?????? alright i have been shopping for a lsx alumn block complete wiring harness and ecm for my rock crawler and i can't find 1 if i do these people think there gold so i have been looking a 5.3 liter and I found some good deals but today I find a 4.8 liter at a really good deal almost to hard to pass up .
so here's the ? I have is are these motors any good
2nd how much power difference is it to a 5.3
the 1 thing to i want to add is the money i will save getting this motor i'll have the money to buy a cam
thank you
so here's the ? I have is are these motors any good
2nd how much power difference is it to a 5.3
the 1 thing to i want to add is the money i will save getting this motor i'll have the money to buy a cam
thank you
03-22-2009, 04:41 PM
#2
I've driven a 4.8, it feels great for just 293 ci. It likes to stay in the top half of the rpm range when you're not cruising for mileage, so you'll need to spend the money you save on deeper gears.
The stock cam specs as 191/190 degrees duration at 0.050", 0.457/0.466" lift, 114 degree lobe separation. Comp Cams offers one that doesn't require tuning the ECM, 206/212 on a 115, lift around .500"
These 4.8s are rated 290 ft-lbs at 4000 versus the 5.3 at 325 ft-lbs at 4000.
The LS4 is aluminum block, can be bored to 5.7L, comes with LS2 heads, and can be had for $1400. The catch is the crank snout is shorter, and similar minor differences at the rear of the block, but the LS1-pattern of bellhousing holes is still there along with the FWD pattern.
Still, helluva great price, just swap in an LS1 crank and pistons. Or go stroker.
The stock cam specs as 191/190 degrees duration at 0.050", 0.457/0.466" lift, 114 degree lobe separation. Comp Cams offers one that doesn't require tuning the ECM, 206/212 on a 115, lift around .500"
These 4.8s are rated 290 ft-lbs at 4000 versus the 5.3 at 325 ft-lbs at 4000.
The LS4 is aluminum block, can be bored to 5.7L, comes with LS2 heads, and can be had for $1400. The catch is the crank snout is shorter, and similar minor differences at the rear of the block, but the LS1-pattern of bellhousing holes is still there along with the FWD pattern.
Still, helluva great price, just swap in an LS1 crank and pistons. Or go stroker.
03-22-2009, 06:27 PM
#5
Teching In
Thread Starter
Join Date: Feb 2009
Posts: 9
Likes: 0
Received 0 Likes
on
0 Posts
so if i got the 4.8 $300 dollars cheaper then the 5.3 would you go with the 4.8 or no
how much is it to make a stroker 5.3 or 4.8 and what would they be if they were strokers
how much is it to make a stroker 5.3 or 4.8 and what would they be if they were strokers
03-22-2009, 07:01 PM
#7
Teching In
Thread Starter
Join Date: Feb 2009
Posts: 9
Likes: 0
Received 0 Likes
on
0 Posts
Trending Topics
03-22-2009, 07:13 PM
#8
TECH Addict
iTrader: (14)
Join Date: May 2005
Location: Simi Valley, CA.
Posts: 2,727
Likes: 0
Received 0 Likes
on
0 Posts
Both are great deals to be honest.
What is the weight of the vehicle? what transmission are you using?
Where are you located? I'd take whatever one you don't choose
What is the weight of the vehicle? what transmission are you using?
Where are you located? I'd take whatever one you don't choose
03-22-2009, 08:40 PM
#12
Teching In
Thread Starter
Join Date: Feb 2009
Posts: 9
Likes: 0
Received 0 Likes
on
0 Posts
that's what i was thinking, I just really want a all alumn engine so it's hard for me to decide what to do what is the weight difference to a 5.3 cast iron to alumn
03-22-2009, 08:42 PM
#13
TECH Fanatic
iTrader: (12)
Join Date: Jun 2007
Location: earth
Posts: 1,438
Likes: 0
Received 0 Likes
on
0 Posts
automatic??? If it is automatic i wouldnt worry about the engine size so much because a good quality stall converter will take care of any torque issues. Id pick the better deal and lower mileage engine... just something to think about. Id pick a stall with a perfect cam to peak the torque at the stall speed. I doubt youd notice a difference between the 4.8 and 5.3 in this application. If your budget limits your choices id definitely go stall and quality transmission cooler before cam with EITHER engine.
03-23-2009, 03:29 PM
#15
TECH Fanatic
iTrader: (12)
Join Date: Jun 2007
Location: earth
Posts: 1,438
Likes: 0
Received 0 Likes
on
0 Posts
auto with a 3200... sounds good. if it were me and i didnt want to pay for the 5.3 id grab the 4.8. ultimately the 5.3 will be better, but by how much is debatable.. its up to you to decide if its 200-300 dollars better. If you dont have the extra cash 200-300 dollars could go to other parts.
