Should I, can I stroke out a vortec 5.3 - Page 2 - Hot Rod Forum : Hotrodders Bulletin Board
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  #16 (permalink)  
Old 11-07-2013, 05:31 PM
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There must be something not right in the engine. Although the 5.3 is no powerhouse in your truck in stock form, it doesn't take much to get power out of them. With the proper combination of parts and the right cam, you shouldn't have any problem getting the results you want. My brother did a 5.3 swap in his 75 Nova and it is amazing how easy it is to make power with the LS architecture ! The power these engines can make, actually makes a GEN 1 or GEN 2 small block obsolete in the easy power category.

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  #17 (permalink)  
Old 11-07-2013, 10:59 PM
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BFalfa55, I never had any problems making power with a gen 1 engine,I dont understand your post?
a roller cammed/fuel injected gen 1 can make very good power
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Old 11-10-2013, 12:12 PM
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I was just trying to say that the LS engine design is an improvement over the GEN 1 design. I know you can make power with them, but the LS engines breath much better by design. For the money, the LS engines can give you a bigger bang for the buck.
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Old 11-10-2013, 12:46 PM
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I believe I found the culprit with my loss of power please if I'm wrong please correct me I'm still new to this trouble shooting. I drove it today and it started out awesome as it warmed up it got really sluggish. So I got into the gas some and it barely responded. When I got it home I had my wife press the gas while I felt the pressure coming from the tailpipes. From 600 rpm to 2000 rpm there was little change in the pressure of the exhaust. But it was a decrease in pressure. From that I am thinking both of my catalytic converters are clogged and causing too much back pressure. I also think that that excessive back pressure may have blown my exhaust manifold gaskets and causing an exhaust leak at the head which sounds like a lifter tapping.
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  #20 (permalink)  
Old 11-10-2013, 12:53 PM
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Quote:
Originally Posted by BamaZ71 View Post
I believe I found the culprit with my loss of power please if I'm wrong please correct me I'm still new to this trouble shooting. I drove it today and it started out awesome as it warmed up it got really sluggish. So I got into the gas some and it barely responded. When I got it home I had my wife press the gas while I felt the pressure coming from the tailpipes. From 600 rpm to 2000 rpm there was little change in the pressure of the exhaust. But it was a decrease in pressure. From that I am thinking both of my catalytic converters are clogged and causing too much back pressure. I also think that that excessive back pressure may have blown my exhaust manifold gaskets and causing an exhaust leak at the head which sounds like a lifter tapping.
Excellent sleuthing there, dude!
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  #21 (permalink)  
Old 11-10-2013, 09:20 PM
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If you remove the O2 sensors before the cat(s) and run it like that,if it revolves the problem by relieving the back pressure.The other thing is to bang on them and if they raddled,that confirms they are plugged.
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Old 11-11-2013, 10:05 AM
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So I just pulled the o2 sensors from in front of my cats and I didn't take away the whole problem but it did make what sounds like a lifter tap decrease majorly and not all my performance returned but I could tell a difference that yall
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Old 11-11-2013, 01:14 PM
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Well that will throw off your tune too,so only run it that way for the test only.Did the cat's raddled when you tapped them with a hammer?.
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