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I've got a 5.3l that's going into a Chrysler conquest/ Mitsubishi starion right now it's on a engine stand with a SUM-8713 cam I'm trying to get as much hp hopefully not as much torque because I dont want to break the differential the exhaust side is ported and soon the intake will be im wondering how much I can mill the heads for more compression? Do I have to get shorter push rods also? Also and ideas for more hp? It is gonna be a daily so trying not to do anything ridiculous and I will be putting an aftermarket 102mm throttle body/intake on it thanks!!! 2nd question is their anything I should upgrade to get 6,700rpm or 6,500rpm? Its already got ls6 beehive springs Cam specs
Last edited by Ericthered; Jan 26, 2021 at 12:45 PM.
That's what most think, but a low revving baby cam with a huge throttle body is a weird mix. You can tune it close enough that it will work well enough but it will be a good bit more touchy than a normal sized throttle for no real gain. Even at 700hp going from a 90 to 105mm TB is like a 6hp gain, sick. I would save the money as its better spent in other areas.
That's what most think, but a low revving baby cam with a huge throttle body is a weird mix. You can tune it close enough that it will work well enough but it will be a good bit more touchy than a normal sized throttle for no real gain. Even at 700hp going from a 90 to 105mm TB is like a 6hp gain, sick. I would save the money as its better spent in other areas.
its not a baby cam I could get the 92mm or 94mm I forget i just dont want the intake to limit the ported heads
A 102 on a 5.3 is really not that big a deal, its completely useless but if I had it I would run it.
Basically, its pointless so why spend the money on it? Especially when the rest of the combo isnt sorted out and its probably going to make 350hp at best.
Basically, its pointless so why spend the money on it? Especially when the rest of the combo isnt sorted out and its probably going to make 350hp at best.
this isnt even about the intake lol it's about shaving the heads! Also its definitely going to make more than 350hp it's more like 430hp
At what rpm and is that at the flywheel or rear wheels?
6,500rpm because that's what the cam goes up to and at the flywheel It would be awesome to hit the 500 mark but i dont think thats realistic from what I'm told it should easily have 430
Basically, its pointless so why spend the money on it? Especially when the rest of the combo isnt sorted out and its probably going to make 350hp at best.
I said if I had it already, I would run it... I did not say go buy one.
this isnt even about the intake lol it's about shaving the heads! Also its definitely going to make more than 350hp it's more like 430hp
You think an NA 5.3 is going to make 430 hp... I'm dead Some cammed 6.0's dont even make that. We speak at the wheels around here, so maybe you are talking crank?
6,500rpm because that's what the cam goes up to and at the flywheel It would be awesome to hit the 500 mark but i dont think thats realistic from what I'm told it should easily have 430
I'm just trying to keep the expectations real. I'd rather expect less and make more, than expect 500 and make 285. You need to turn little engines to make power, you dont have the cam or springs to do that so its not going to make much power. A lot of guys with baby cam 5.3's end up in the 310-320whp range only revving to 6500, some eek out 330 at 7000. Boltons and a cam only do so much, your talking about an engine that hits the wheels with at best 250whp when rated at 310 flywheel.
I ran the summit 8702 cam on a 5.3 at 8000RPM with higher compression, big intake/throttle body, big headers, on E85, etc and didnt make the power you are claiming, not even close.
You think an NA 5.3 is going to make 430 hp... I'm dead Some cammed 6.0's dont even make that. We speak at the wheels around here, so maybe you are talking crank?
yes I'm talking crank 430 hp at the wheels would be like 550 hp which would be extremely hard to reach
I'm just trying to keep the expectations real. I'd rather expect less and make more, than expect 500 and make 285. You need to turn little engines to make power, you dont have the cam or springs to do that so its not going to make much power. A lot of guys with baby cam 5.3's end up in the 310-320whp range only revving to 6500, some eek out 330 at 7000. Boltons and a cam only do so much, your talking about an engine that hits the wheels with at best 250whp when rated at 310 flywheel.
I ran the summit 8702 cam on a 5.3 at 8000RPM with higher compression, big intake/throttle body, big headers, on E85, etc and didnt make the power you are claiming, not even close.
well its gonna have bigger injectors obviously and it's getting a custom tune also having a haltech 950 and I'm not expecting 500 I'm expecting 430 (at the crank) which is reasonable also it's got ported heads you keep leaving that out also hard time believing your going 8,000rpm and I doubt your cam is effective past 7,000rpm
well its gonna have bigger injectors obviously and it's getting a custom tune also having a haltech 950 and I'm not expecting 500 I'm expecting 430 (at the crank) which is reasonable also it's got ported heads you keep leaving that out also hard time believing your going 8,000rpm and I doubt your cam is effective past 7,000rpm
By all means dont take my word for it, hopefully you make 350+whp its certainly possible with an efficient manual drivetrain on a happy dyno but standalone doesnt add any power, and ported heads arent worth much on a NA 5.3L with a .545 lift cam. lol trust me I had Holley EFI, Bosch 210's, fancy headgaskets, E85, maxed out timing, I did it because I was bored and went back to making 1000+hp with my turbos.
A 236/246 cam wants to rev in a 5.3L. If you havent revved one out past 7000 you're missing out, summits 8717 cam makes power to 7900 in a 5.3L as well. If all you do is go by is the specs on the cam chart then you arent going to have the greatest results.
well its gonna have bigger injectors obviously and it's getting a custom tune also having a haltech 950 and I'm not expecting 500 I'm expecting 430 (at the crank) which is reasonable also it's got ported heads you keep leaving that out also hard time believing your going 8,000rpm and I doubt your cam is effective past 7,000rpm
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N/A 5.3l build 
and I will be putting an aftermarket 102mm throttle body/intake on it thanks!!! 2nd question is their anything I should upgrade to get 6,700rpm or 6,500rpm? Its already got ls6 beehive springs
I could get the 92mm or 94mm I forget i just dont want the intake to limit the ported heads 
Some cammed 6.0's dont even make that. We speak at the wheels around here, so maybe you are talking crank? 
430 hp at the wheels would be like 550 hp which would be extremely hard to reach 
also hard time believing your going 8,000rpm and I doubt your cam is effective past 7,000rpm 