5.3 GEN IV Carb'd Impala Resto
11-11-2013, 10:57 AM
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5.3 GEN IV Carb'd Impala Resto Hey guys. Just picked up a gen IV 5.3 for my impala. I'm lookin for lots of ponies on a budget build. I'm always hearing about it, and I just jumped on board!! What would you build? Keep in mind this is a weekend car, not dd. This car is 73 4 door, so shes probably just shy of 5000lbs,
I want her to scream!!!! Any info is much appreciated!!
I want her to scream!!!! Any info is much appreciated!!
11-11-2013, 11:44 AM
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Well i had planned on purchasing a set of L92's,,,,but that went out the window as of a 5.3 is shy of 4'' bore..... And i also ended up with the gen 4, with a set of 243 heads(ls2 heads???) Im debating taking these heads. having them matched with a victor....
could i expect 500 hp from these heads matched ( with decent springs and rockers of course ) and aggressive cam? I have the connections as far as shop rates go.... looking to spend 2000 or so
could i expect 500 hp from these heads matched ( with decent springs and rockers of course ) and aggressive cam? I have the connections as far as shop rates go.... looking to spend 2000 or so
11-11-2013, 12:01 PM
#5
Those heads were originally cast for the Z06 corvette in early 2000s. Later on the LS2 they were there and also the 799 which is an identical head.
They can be ported to flow 300+ cfm and are a exceptional factory casting.
Now, with porter 243s and a custom cam, there have been some 5.3s make 400 rear wheel HP. You can bore the block to 3.9 and use a LS1 piston size and have 346 cubes or stroke it to 383. Plenty of options and it depends on how much you want to get from it. My older model 5.3 with the BS old stock truck heads from 99-06 went 7.7 at 92 mph with no tuning at 3500 pounds. That was a edelbrock grind cam, nothing special and only totes .540 lift. That was also with the heavy 4L80 Trans and 12 bolt.
So, the more you spend the faster you can go.
They can be ported to flow 300+ cfm and are a exceptional factory casting.
Now, with porter 243s and a custom cam, there have been some 5.3s make 400 rear wheel HP. You can bore the block to 3.9 and use a LS1 piston size and have 346 cubes or stroke it to 383. Plenty of options and it depends on how much you want to get from it. My older model 5.3 with the BS old stock truck heads from 99-06 went 7.7 at 92 mph with no tuning at 3500 pounds. That was a edelbrock grind cam, nothing special and only totes .540 lift. That was also with the heavy 4L80 Trans and 12 bolt.
So, the more you spend the faster you can go.
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11-11-2013, 04:24 PM
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7200 seems like alot!!! haha,,,, any valve mods? this your daily? What grind did you go with on your 5.3? if you had the chance to do it again,,,,, would you make another decision, or stick with the same cam?
Im willing to go with a very aggressive cam, this will be strictly weekend car, smog exempt
Im willing to go with a very aggressive cam, this will be strictly weekend car, smog exempt
11-11-2013, 04:44 PM
#11
Do you want to go fast, or just make noise? At 5000lbs and with a 5.3, you will go faster with a milder cam setup. Unless its for interstate racing, you will need all the torque you can muster to get that boat moving. Give one of the cam gurus a call and see what they can put together, or if you don't want a custom grind, look at some of the truck specific grinds out there. They are usually designed for heavy stuff and max ,torque production.
11-11-2013, 05:26 PM
#13
My 5.3 has a edelbrock 2216, and I wanted something that could make the car in and sound great. And it works perfect for that. Considering I have not even touched the tune on the carb since I threw it on. Only has valve springs. The 6.0 has a trex cam, pushrods and valve springs.
