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Highest HP From 243 Heads?

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Old 03-27-2018, 10:18 AM
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Originally Posted by tug686spd
I seen that car run at Englishtown badass. The only thing is that car was stripped down only a drivers seat inside.
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Old 03-27-2018, 10:33 AM
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Originally Posted by gagliano7
I seen that car run at Englishtown badass. The only thing is that car was stripped down only a drivers seat inside.
I was going to mention this. It's badass, but I'm sure it's been put on a diet. Still evil.
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Old 03-27-2018, 10:39 AM
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I have seen 550whp with a 416 stroker and right around 500whp with a high strung 346. I agree with others that dyno numbers don't mean much without a baseline.
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Old 03-27-2018, 04:04 PM
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A friend made like 630 crank on a engine dyno with a 346 and stock 243s. They can make good power. It's a hydraulic cammed dirt car engine.
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Old 03-06-2019, 11:41 PM
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Well.....a year later bump and hopefully well find out before to long what my mild 346 243 headed build is gonna do.
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Old 03-17-2019, 12:36 AM
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This head has some area.

https://www.corvetteforum.com/forums...g-results.html
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Old 03-17-2019, 07:29 AM
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I can't say I'm impressed with those results.
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Old 03-22-2019, 02:55 PM
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Originally Posted by Smokey B
Horrible numbers lol I made 507 wheel only 416 with Stock 243's...
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Old 03-23-2019, 09:08 AM
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That was 510whp on 7 cylinders. Should have been about 583whp if all 8 were firing.
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Old 03-23-2019, 10:24 AM
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I'm hoping to get near 550whp with a 346 and messaged gmpp 243s. Hopefully my results will come sooner rather than later....but we all know how that goes down.
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Old 03-23-2019, 12:23 PM
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Wonder what it traps tho lol
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Old 03-23-2019, 12:58 PM
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We'll find out at some point. I'll be looking for 135+.
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Old 03-24-2019, 04:20 AM
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Morgan Motorsports made over 500 RWHP back in 2000. Their Aggressor 500 Head/Cam kit. Stock cubes.
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Old 06-14-2019, 08:51 AM
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I'm running PRC LS6 2.5 heads on my LS3 427. M6 Car weighs 3490 with me. With my current cam (239/252 .620/.596 111 lsa) it has trapped 127 in the quarter.
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Old 06-14-2019, 08:56 AM
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That's not that good.
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Old 06-14-2019, 09:04 AM
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I agree. A 427 with 243's, no matter how good they are, is being choked. Bigger heads and smaller cam would help it.
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Old 06-14-2019, 09:09 AM
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Originally Posted by G Atsma
I agree. A 427 with 243's, no matter how good they are, is being choked. Bigger heads and smaller cam would help it.
I Disagree. G~ Ive seen a 408ci motor with some serious ported 243 heads make over 500 rwhp threw a automatic and the car ran 9.9s in the quarter. Fourth gen camaro.
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Old 06-14-2019, 09:10 AM
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Originally Posted by HioSSilver
That's not that good.
Depending on the weight.....
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Old 06-14-2019, 09:14 AM
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Originally Posted by Tuskyz28
I Disagree. G~ Ive seen a 408ci motor with some serious ported 243 heads make over 500 rwhp threw a automatic and the car ran 9.9s in the quarter. Fourth gen camaro.
That's cool! Those ports had to be paper thin and getting some SERIOUS velocity! AKA SMOOOOTH ports!
But now, this is on a 408, where the poster above is on a 427. Would 19 cubic inches make that big a difference?
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Old 06-14-2019, 09:16 AM
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Originally Posted by G Atsma
That's cool! Those ports had to be paper thin and getting some SERIOUS velocity! AKA SMOOOOTH ports!
But now, this is on a 408, where the poster above is on a 427. Would 19 cubic inches make that big a difference?
Depending on the head porter/cnc job you can run a bigger valve in the head. I 19 cubes larger is great but it would still perform if the head have a MEAN cnc job done to them.
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