Highest HP From 243 Heads?
#101
TECH Veteran
I've seen a fella here from Mississippi run a 7.02 in the 1/8 mile in a 01 Z28 6 speed car with ported 243 heads on the SBE. Thats roughly a 11 sec flat car in the quarter. Car appeared to have full interior but it also had a BMR K member etc .....
#104
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I'll give this old thread a bump. My junk is probably in the ballpark. It made 544whp 446wtq as a baseline....but it was running out of fuel. So I have a fuel pump now and it will be e85 capable. A couple other little things to do to go along wuth that. Hopefully end up in the 570-580 whp range.
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#105
#106
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It amazes me to see these kind of numbers from cathedral headed engines with less cubes when I'm making only 540rwhp 500tq from a 93 tuned LSX427 with Brodix BR7 heads and a 102mm intake and throttle body. I'd like to know more about these builds because somethings not adding up.
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wannafbody (07-08-2024)
#107
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It amazes me to see these kind of numbers from cathedral headed engines with less cubes when I'm making only 540rwhp 500tq from a 93 tuned LSX427 with Brodix BR7 heads and a 102mm intake and throttle body. I'd like to know more about these builds because somethings not adding up.
#108
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#109
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They have to be running high compression motors with worked over cylinder heads running on high octane fuel and turning big race cams.
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#111
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It amazes me to see these kind of numbers from cathedral headed engines with less cubes when I'm making only 540rwhp 500tq from a 93 tuned LSX427 with Brodix BR7 heads and a 102mm intake and throttle body. I'd like to know more about these builds because somethings not adding up.
Which goes hand in hand if you have that big cam and are using a intake that's done at 6300 your **** is only gonna make noise.
How hard can it be?? I'm using a 5.7 with gen4 rods because they were $100, mahle pistons I did pay some attention to but they were restocks from amazon, gm performance parts cnc heads from the 2003 era with stock valves that everyone thought was junk. That I originally found, bought and sent to big hammer because he wanted them and then didn't use them so I bought them back.
A llsr cam/lifters that came out of darths h/c 5.7 he gave me and a msd intake that was on fire in aaron's car.
I mean you're running way more of a build than me. There's been bolt on ls7s make what your 427 made.
Last edited by HioSSilver; Yesterday at 05:15 PM.
#113
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My car basically is a bolt on 427..lol
#114
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It's all about the combo. You can buy all the good parts you want but if you don't just stick to basic hotrodding **** then you won't get good results. That's saying nothing to me.
Big hammer posted my results on fb because I loath fb.....some had a nervous breakdown
idk....what is high compression these days. Is it forced induction, bottle fed or just plain engine power and what about it's primary use because it's a determining factor. My car did what it did on 93 octane sheetz gas running out of fuel pressure.
What is a big cam these days? 23x/24x isn't that big compared to some......but if you don't have enough compression to go with your big cam then your **** is gonna suck. 23x/24x is a baby cam, I'm talking about LLSR's with much higher duration and lift, you know much like the one that's probably running in your car to make all that power for less.
Which goes hand in hand if you have that big cam and are using a intake that's done at 6300 your **** is only gonna make noise. Yeah, I don't have an LS3 intake sitting on a 427 here so what's your point?
How hard can it be?? I'm using a 5.7 with gen4 rods because they were $100, mahle pistons I did pay some attention to but they were restocks from amazon, gm performance parts cnc heads from the 2003 era with stock valves that everyone thought was junk. That I originally found, bought and sent to big hammer because he wanted them and then didn't use them so I bought them back..
A llsr cam/lifters that came out of darths h/c 5.7 he gave me and a msd intake that was on fire in aaron's car.
I mean you're running way more of a build than me. There's been bolt on ls7s make what your 427 made.
Big hammer posted my results on fb because I loath fb.....some had a nervous breakdown
idk....what is high compression these days. Is it forced induction, bottle fed or just plain engine power and what about it's primary use because it's a determining factor. My car did what it did on 93 octane sheetz gas running out of fuel pressure.
What is a big cam these days? 23x/24x isn't that big compared to some......but if you don't have enough compression to go with your big cam then your **** is gonna suck. 23x/24x is a baby cam, I'm talking about LLSR's with much higher duration and lift, you know much like the one that's probably running in your car to make all that power for less.
Which goes hand in hand if you have that big cam and are using a intake that's done at 6300 your **** is only gonna make noise. Yeah, I don't have an LS3 intake sitting on a 427 here so what's your point?
How hard can it be?? I'm using a 5.7 with gen4 rods because they were $100, mahle pistons I did pay some attention to but they were restocks from amazon, gm performance parts cnc heads from the 2003 era with stock valves that everyone thought was junk. That I originally found, bought and sent to big hammer because he wanted them and then didn't use them so I bought them back..
A llsr cam/lifters that came out of darths h/c 5.7 he gave me and a msd intake that was on fire in aaron's car.
I mean you're running way more of a build than me. There's been bolt on ls7s make what your 427 made.