400hp 5.3? Can it happen?
Aug 26, 2010 | 04:35 PM
#41
OK I think it's time I change my plan. What about 350 hp with lots of torque? Even thought about just putting a z06 cam in it. But I like the idea of lots of torque. The odds of me taking it to the track are slim to none. I just want something to play on the street with. What would be the most practical approach to a set-up with torque out the a**? I know the 6.0 would do it easily, but I have the 5.3. The extra expense of buying everything for a 6.0 will go along way to my wheels/tires and paint job. Any ideas?
Aug 26, 2010 | 05:06 PM
#42
Agreed. If you could get 11:1 compression out of it, you might be able to get some decent TQ out of it... But the 241 heads will drop your compression to about 9.0 so they'll actually hurt your chances of getting any TQ out of it. IMO, ditch the 241's either way because they'll barely out flow the 706's. The only difference from your 241's to a set of stock 5.3 heads are they have slightly larger valves and have bigger (+5cc) combustion chambers.
Aug 26, 2010 | 05:40 PM
#43
Agreed. If you could get 11:1 compression out of it, you might be able to get some decent TQ out of it... But the 241 heads will drop your compression to about 9.0 so they'll actually hurt your chances of getting any TQ out of it. IMO, ditch the 241's either way because they'll barely out flow the 706's. The only difference from your 241's to a set of stock 5.3 heads are they have slightly larger valves and have bigger (+5cc) combustion chambers.
Aug 26, 2010 | 11:12 PM
#46
OK I think it's time I change my plan. What about 350 hp with lots of torque? Even thought about just putting a z06 cam in it. But I like the idea of lots of torque. The odds of me taking it to the track are slim to none. I just want something to play on the street with. What would be the most practical approach to a set-up with torque out the a**? I know the 6.0 would do it easily, but I have the 5.3. The extra expense of buying everything for a 6.0 will go along way to my wheels/tires and paint job. Any ideas?
Aug 27, 2010 | 03:03 PM
#49
I'm not sure how far you would need to mill them off the top of my head but i'd imagine at least .040 to .050... Then your looking into different length pushrods, intake alignment problems and yes, PTV clearance, depending on how big the cam is.
Aug 27, 2010 | 04:18 PM
#50
Well, I guess it's like someone else told me--scrap them. Oh well! Lesson learned. Guess I can re-work the 862's that are on my current motor in the truck. Just out of curiosity with a good educated guess, how much am I looking at for P&P work, up-size the valves ( Do I really need that with the smaller bore?), upgrade the springs,seals,retainers and locks, and a good cleanup?
