All Motor monster
M6 would be a lot easier then an auto. Both will need the same thing any aggressive build needs to make big numbers...very good heads and a fairly large cam.
500 SAE has been done out of a 355. Most peoples 383/396 builds barely hit the 450 mark.
Kinda just depends on how you approach it.
The ONE thing that is the same no matter how you intend to attain that goal, bring your checkbook
Kinda just depends on how you approach it.
The ONE thing that is the same no matter how you intend to attain that goal, bring your checkbook
TECH Apprentice
Joined: Feb 2009
Posts: 365
Likes: 0
From: A DEN
Could not have put it better myself. It makes me cringe when I think about how much I got in my motor.
You will need good set of heads and an aggressive cam.
My cam is 247/258 .608 on a 108 LSA I have a good set of Trickflows.
I dont know what the car will chasis dyno but the engine dyno is around 550hp at the crank. This is a M6 car so that should put me just a lil over 450 to the wheels with a HR cam. I have all the supporting mods also.
With a M6 you can do it. With a HR and an auto its gonna be hard.
A dyno is a tuning tool anyway the track mph is what walks the walk.
Could not have put it better myself. It makes me cringe when I think about how much I got in my motor.
You will need good set of heads and an aggressive cam.
My cam is 247/258 .608 on a 108 LSA I have a good set of Trickflows.
I dont know what the car will chasis dyno but the engine dyno is around 550hp at the crank. This is a M6 car so that should put me just a lil over 450 to the wheels with a HR cam. I have all the supporting mods also.
With a M6 you can do it. With a HR and an auto its gonna be hard.
A dyno is a tuning tool anyway the track mph is what walks the walk.
You will need good set of heads and an aggressive cam.
My cam is 247/258 .608 on a 108 LSA I have a good set of Trickflows.
I dont know what the car will chasis dyno but the engine dyno is around 550hp at the crank. This is a M6 car so that should put me just a lil over 450 to the wheels with a HR cam. I have all the supporting mods also.
With a M6 you can do it. With a HR and an auto its gonna be hard.
A dyno is a tuning tool anyway the track mph is what walks the walk.
The link I want is dead due to a major Impala forum crash, but one of the Impala guys has a 44x rwhp 383 with ported AI heads and intake, and a reasonably sized hydraulic cam. 4L60E 8.5" 10bolt, nothing particularly fancy just a well built, well thought out motor.
These goals are easily in reach IF you follow a proven recipe EXACTLY.
People fail miserably when they think they can "save" $200 on "equivalent" parts, or that they know something more than the guys who have done it.
With the hard 7000rpm limit of the pcm there really is no reason to give up much lowend, even a motor like this should be a monster down low.
It wont be cheap though, a $1200 ebay rotating assembly wont do it, a bargain basement machinist wont either.
At the same time the guys who are going to tell you you need to spend stupid amounts of money on converting heads and intake are wrong too, it does not cost that much, all that extra work is just wasted money.
These goals are easily in reach IF you follow a proven recipe EXACTLY.
People fail miserably when they think they can "save" $200 on "equivalent" parts, or that they know something more than the guys who have done it.
With the hard 7000rpm limit of the pcm there really is no reason to give up much lowend, even a motor like this should be a monster down low.
It wont be cheap though, a $1200 ebay rotating assembly wont do it, a bargain basement machinist wont either.
At the same time the guys who are going to tell you you need to spend stupid amounts of money on converting heads and intake are wrong too, it does not cost that much, all that extra work is just wasted money.
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i dont see why its considered such a huge HR, plenty of 25x/26x HR in 408 lsx motors making 550+ rwhp. i think the lsx platform proves big HRs can work very well. not many people with big HR ltx motors though, they just go SR.
