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Highest HP From 243 Heads?

 
Old 03-23-2018, 12:06 PM
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Default Highest HP From 243 Heads?

What's the highest hp you've seen that's been made out of a H/C/I LS1 while using 243 heads??
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Old 03-23-2018, 12:24 PM
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NA, N2O or boosted? HAHAHA...easily over 1000...
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Old 03-23-2018, 12:25 PM
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I'm sure someone had made near 500 on a happy dyno
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Old 03-23-2018, 01:14 PM
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Originally Posted by ss454327 View Post
NA, N2O or boosted? HAHAHA...easily over 1000...
Well I did just say H/C/I only

Originally Posted by HCI2000SS View Post
I'm sure someone had made near 500 on a happy dyno
Hmmm trying to find one!
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Old 03-23-2018, 01:47 PM
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Originally Posted by DoggyB22 View Post
Well I did just say H/C/I only

You added the ONLY to this one...HAHAHAHA. Seriously though a dyno is a tuning tool and not really a measuring stick IMO. My cousin has a very tight dynojet dyno that hurts a lot of feelings but it's well maintained and calibrated often. I have had my truck on his dyno and a local Mustang and his was 32 hp lower on the same tune. We then picked up another 25hp to the tires with tuning. A 1/4 mile is a much better guide IMO.
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Old 03-23-2018, 02:18 PM
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To be honest i wouldn't take any dyno numbers with a grain of salt. A buddy of mine made 485 rwhp with PRC 5.3 heads through a stalled auto HCI LS1. Was it any faster than other HCI LS1's with a similar build that dynoed lower?? No not really. Bottom line is even if you did find one that made 500 rwhp it likely wouldn't be any faster than one that made 450 rwhp. Dynos vary too much. Take two cars with the same build, tune, etc...and they will run basically the same regardless of the dyno number
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Old 03-23-2018, 02:31 PM
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I made 507 Rwhp on my 416 with 243's . don't see it happening with a 346. just my $.02
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Old 03-23-2018, 02:32 PM
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Originally Posted by HCI2000SS View Post
To be honest i wouldn't take any dyno numbers with a grain of salt. A buddy of mine made 485 rwhp with PRC 5.3 heads through a stalled auto HCI LS1. Was it any faster than other HCI LS1's with a similar build that dynoed lower?? No not really. Bottom line is even if you did find one that made 500 rwhp it likely wouldn't be any faster than one that made 450 rwhp. Dynos vary too much. Take two cars with the same build, tune, etc...and they will run basically the same regardless of the dyno number
THIS is the best answer ive seen given on this Site. lol
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Old 03-23-2018, 03:08 PM
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Try this. Go to Corvette Forum. Apply the mph to weight formula in Wallace racing site to the 2 or 3 fastest ls2's in the bolt on list and average it out. You could add about 20-25 rwhp to the results for porting and whatever. There are more formulas there for smallest cross section within a ported head as well. With minimum cross section info you can calculate for maximum potential horse power at a given rpm per cid size.

Last edited by handyandy496; 03-23-2018 at 03:19 PM.
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Old 03-23-2018, 04:02 PM
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I've seen 530 rwhp on a 408ci with 10.0 e.ts....
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Old 03-23-2018, 04:44 PM
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User NSkyline made 487 on a 5.7 and untouched 243 IIRC
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Old 03-23-2018, 05:50 PM
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They’re capable of around 570 hp stock and 650
Ported best case scenario
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Old 03-23-2018, 11:36 PM
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I think Big Hammer is pretty close with this estimate


I've read that the Wegner 799/243 Nascar spec heads with stock valve size could make high 500's rear wheel ~575-585 whp with all the supporting goodies like vacuum pump etc in the NASCAR configuration. I've not seen a dyno graph to support that however. It's been said the stock valve size was the governing factor and more hp was possible with a bigger valve and a little more port work.
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Old 03-24-2018, 10:27 AM
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Old 03-24-2018, 11:37 PM
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Still one of my favorites.
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Old 03-25-2018, 12:56 AM
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Originally Posted by tug686spd View Post
Same. Love that video
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Old 03-25-2018, 06:52 PM
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Wouldn't be right if I didn't post Pain's car. If I remember he was PainLs1 on here.
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Old 03-26-2018, 10:07 AM
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Allan Futral eclipsed 500rwhp a LONG time ago. The car's performance backed up the dyno numbers.

https://ls1tech.com/forums/dynamomet...fms-346-a.html
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Old 03-26-2018, 11:00 AM
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Originally Posted by Marc 85Z28 View Post
Allan Futral eclipsed 500rwhp a LONG time ago. The car's performance backed up the dyno numbers.

https://ls1tech.com/forums/dynamomet...fms-346-a.html
Most people want to believe today's heads and cams are way better. Truth is here's 3 examples of us trying to keep up.
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Old 03-26-2018, 02:46 PM
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Originally Posted by tug686spd View Post
Wouldn't be right if I didn't post Pain's car. If I remember he was PainLs1 on here.
Yeah... this used to be one of my favs too!
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