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Ideas on making 500-550 rwhp

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Old 04-28-2004, 09:34 PM
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Originally Posted by DenzSS
500-550rwhp, you may as well toss out the idea of a 383. A stroke change alone isn't going to get you there. You'll make a lot of midrange torque, but your peak HP numbers will not be that different. Regardless, a 383 is a very good combination.

A 408 with good heads will get you there.

Good parts are going to be expensive. Nothing you can do to avoid that.
I have a 396 STROKER and its my daily driver. 100%, i bet someone whos never driven a manual transmision could learn on my car its that easy to drive. If you want one, call Alan Futral .
Old 04-28-2004, 09:40 PM
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Im gonna go ahead and say that this is also through a 12 bolt rear end, with no dyno tricks, with 17x11 zr1 rims on the car with nittos. It isnt unthinkable by any means, and for the person that said a stroker isnt fun on the street? say that to my neighbors and ask them about all the black marks on my street, neighboorhood, kroger parking lots, publix parking lots, numerous stop lights etc... and ask a few kids around where i live that ive taken for a ride if its fun or not.

Go with a big bore or a stroker , get it built by a good engine builder and be done with it.
Old 04-29-2004, 04:01 PM
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Originally Posted by 770boy
Im gonna go ahead and say that this is also through a 12 bolt rear end, with no dyno tricks, with 17x11 zr1 rims on the car with nittos. It isnt unthinkable by any means, and for the person that said a stroker isnt fun on the street? say that to my neighbors and ask them about all the black marks on my street, neighboorhood, kroger parking lots, publix parking lots, numerous stop lights etc... and ask a few kids around where i live that ive taken for a ride if its fun or not.

Go with a big bore or a stroker , get it built by a good engine builder and be done with it.
Okay - I'll bite. Sounds great! Details on your motor?
Old 04-29-2004, 06:39 PM
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Diamond pistons, eagle rods, offset ground crank, TEA stage 2 5.3 heads with a "competition" hand finish on them, I believe the cam is a Futral Motorsports 239/241 595 cam, tuned by Futral and built by futral, all accesories, ls6 intake, etc etc etc.
Old 04-29-2004, 07:02 PM
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770 - do you have a dyno graph posted here or can you post one?
Old 04-29-2004, 07:52 PM
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You Pimp. I didn't mean to offend you in my earlier post. If you were a member with a lot of posts I would have said nothing. With your post count being at like 3 when you started this thread it seemed like you were a newbie and not doing any scearches. You see this all the time.

Anyways I think you have gotten a ton a good posts. Call some of the companies suggested by other members. I perfer AP as does many. I also perfer Absolute Speed for heads. Just who I happen to like. There are many great sponsors here and all willing to help us out. I think a 408 would be a wise choice. And a little cheeper.
Old 04-29-2004, 08:58 PM
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Originally Posted by mikey
We just made 502 rwhp with a 346 CI head and cam package. Details here:

http://www.rapidmotorsports.com/mode...=1&intYearId=3

Damn!! $6,000.00 for a H/C package + $1,300.00 if you don't already have LS6 heads! = $7,300.00. I'd think you'd be better off going with a stroker, it will be much less 'at the limit' than a 500rwhp 346. It will last you a LOT longer. And it's not much more than that H/C package.
Old 04-29-2004, 10:46 PM
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Heres the graph.
Attached Thumbnails Ideas on making 500-550 rwhp-dyno.jpg  
Old 04-29-2004, 11:46 PM
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Originally Posted by Mike 01WS6
Damn!! $6,000.00 for a H/C package + $1,300.00 if you don't already have LS6 heads! = $7,300.00. I'd think you'd be better off going with a stroker, it will be much less 'at the limit' than a 500rwhp 346. It will last you a LOT longer. And it's not much more than that H/C package.
The price isn't that bad, considering it includes the FAST intake and 90MM TB, both pricey pieces.


Agree with you that for street longevity purposes, a 382 making 500rwhp would tend to be better than a 346 making 500rwhp.
Old 04-29-2004, 11:48 PM
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Originally Posted by 770boy
Diamond pistons, eagle rods, offset ground crank, TEA stage 2 5.3 heads with a "competition" hand finish on them, I believe the cam is a Futral Motorsports 239/241 595 cam, tuned by Futral and built by futral, all accesories, ls6 intake, etc etc etc.
I thought you could only get to 366ish cubes with an offset ground stock crank? Or is this an offset ground stock crank combined with a resleeved bored out block?
Old 04-30-2004, 04:23 AM
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Originally Posted by TTopJohn
I thought you could only get to 366ish cubes with an offset ground stock crank? Or is this an offset ground stock crank combined with a resleeved bored out block?
Yes its been bored, i believe 4.125 and it has Darton WET Sleeves.
Old 04-30-2004, 10:53 AM
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JZ - none taken. I get tired of reading the same post over an over again. too.

Can anybody testify to the reliabilty of their set ups?
Old 04-30-2004, 07:30 PM
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ok guys after reading for a while and hearing the same thing over and over again hears some info. i have a stock ls1 motor and alot of bolt ons. and am making 400 wrhp so i dont see it being hard to make 500 to 550 at the wheels with a 387ci. now as far as you get what you pay for thats right on the mark. me personally i would save the money and go with a 427ci in a C5R 7.0 liter block. its about 5 grand more but will take you where ever you want to go especially if later on down the road you get greedy and want even more power the 427 will do it. and the nice thing is its an aluminum block. just my .02

Last edited by Z28 10 SECOND CLUB; 04-30-2004 at 08:11 PM.
Old 04-30-2004, 08:21 PM
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First off, to say it CAN'T be done is wrong. It can be done and already has been done. Its about the right combo of parts and the time spent doing the calcs. Not just about the $$ spent. I'm putting together a 6 liter and plan to be over the 500 mark. Once I get the hog up and running I'll be happy to post up the results
Old 05-01-2004, 01:40 PM
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Originally Posted by Z28 10 SECOND CLUB
personally i would save the money and go with a 427ci in a C5R 7.0 liter block. its about 5 grand more but will take you where ever you want to go especially if later on down the road you get greedy and want even more power the 427 will do it. and the nice thing is its an aluminum block. just my .02
Yeah, that would be ideal - but it's already a bit of a stretch to move up the food chain from a 346 heads & cam package to a stroker or an all bore. Given the current income stream forecast, it would be too much of a stretch to do stroker AND resleeved.

500-550 rwhp is just a number, obviously it CAN be done with 427cubes, 408 cubes, 382 cubes or even 346 cubes depending on how wild your setup is. The question isn't really how to make 550 horsepower, it's how close can you get to that (with 475 being close) without spending 427 kind of money and maintaining 50,000 mile reliablity for a mostly street car.

Let me rephrase the question: If you have a similar setup, How much power have you reliably and streetably gotten out of 408-382 cubes? How long have you been running it in the car, how's it drive, and have you had any problems?



Note - yes, lots of these questions could be answered by calling some shops, and asking them how much hp can you build me for $X given these drivability and reliablity desires.
But shops are busy, so no need to take their time up when you are still >1 year away from the purchase. This forum is a better place for these kind of far out "bench racing engine combo" questions.
I've got a few other things to take care of before engine - for example: suspension. because the all stock 110K mile stuff is not going to play nice with any kind of horsepower increase

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Old 05-01-2004, 07:38 PM
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Well we know we can get just over 500rwhp with a 408ci. How close can we get to 550rwhp and what would it take?




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