HP Ratings

« **Reply #25 on:** May 23, 2008, 01:24:36 PM »

I find it difficult to believe that a cam that was designed in 1969 (LS6 came out in 1970) can't be improved enough to get a extra 100 HP with the addition of the newer cam, headers, intake, and some jetting. Seriously, I have no idea what duration and lift the LS6 had but figuring on when it was designed it can't be that great of a cam as compared to today's cam profiles.

But hey, no argument here. A BBC with a new cam, headers, and intake max's out at 549 HP and 550 HP is just a flat out lie and BS.

« **Reply #26 on:** May 23, 2008, 02:12:42 PM »

I should rephrase. I DO believe it is possible to get 550hp, with enough Cam and RPM. I DON'T believe it is possible to get that power at a lower RPM like these jet boats like. What's the peak flow on a stock oval port and cast iron head anyway?

« **Reply #27 on:** May 23, 2008, 02:20:53 PM »

Besides when I built my motor I wanted a flat,high torque curve. It's cool to say I have 722HP but that was at 7400 on the dyno. I am most proud of 658ft.lbs. below 5700rpm. Torque is way more important in my book

« **Reply #28 on:** May 23, 2008, 06:43:30 PM »

Quote from: Blue on May 23, 2008, 02:20:53 PM

Besides when I built my motor I wanted a flat,high torque curve. It's cool to say I have 722HP but that was at 7400 on the dyno. I am most proud of 658ft.lbs. below 5700rpm. Torque is way more important in my book

You're right, it is cool when you say that.

But I think you're lieing and that you can't have more than say... 550 HP!

« **Reply #29 on:** May 23, 2008, 08:44:35 PM »

Hey, everyone can hit 5800-6000 RPM with thier A equipt jets, right? Easy 550 HP...

« **Reply #30 on:** May 23, 2008, 09:19:41 PM »

Quote from: speedymopars on May 23, 2008, 08:44:35 PM

Hey, everyone can hit 5800-6000 RPM with thier A equipt jets, right? Easy 550 HP...

See, I told you! Would Speedy lie?

« **Reply #31 on:** May 27, 2008, 11:29:07 AM »

When I got my pump rebuild and took my boat out I lost 300 rpms but my boat feels much much faster. Just cause your worn out pump spins 6000 rpms does not mean you are making 800 hp spinning a A.

« **Reply #32 on:** May 27, 2008, 01:53:30 PM »

Could somebody post a link to that HP/RPM chart for boats. I hate to ask cuz I know it has been up a lot but I just never copied it. I'll gladly pay you tomorrow for a chart today...

« **Reply #33 on:** May 27, 2008, 07:25:16 PM »

« **Reply #34 on:** May 27, 2008, 07:38:15 PM »

Sorry I had to ask but I had to know. Thanks for the linkey

« **Reply #35 on:** July 15, 2008, 03:54:28 AM »

I'm pretty new here, I'm Darren. My thoughts are yes and no on the 500hp thing. Yes quite a few people are full of B.S. with their HP claims.....but the 500 hp 454 is very easy to obtain with todays products. My own 78 challenger I am getting my parts together for the new stock stroke 454 .030 over. I will be using a solid flat tappet approx .250/.260 @050 dur .595/613 lift.Some say to big of cam, I also back up the cam a few degrees to put the power where I want it. 049 heads, I use a DUI HEI dist, 10:5 to 1 comp. pump gas. single plane intake wilson spacer. I have many hours on westech dyno's I will see approx 630 HP. it's not the first time doing this. One of the key players is the cyl. head work. Yes porting and larger valves but for less than aftermarket heads, this can be done, no problem. I live in the Long Beach area if you would like to go to the dyno with me pm me when I start a build thread.I am shooting for sept. or oct to be complete.

« **Reply #36 on:** July 15, 2008, 06:10:52 AM »

I would be interested in watching a thread of a decent build with the dyno run being the final say.

« **Reply #37 on:** July 15, 2008, 03:29:10 PM »

If you guys don't mind I am no high roller, it will take a few months but I would be glad to start a thread "600+ HP" made easy! I just picked up my used "sweet deal" 049's casting# 353049, next week they will get cleaned&magged. I will start the new thread then. Looking forward to the dyno, talk to you guys later, "D" Heading to parker july 25th weekend I stay at Riverland stop by and say hi, I will have my boat with the stock 454 puttin around.

« **Reply #38 on:** July 20, 2008, 09:06:35 PM »

you boys ever seen a grown man naked?

« **Reply #39 on:** July 20, 2008, 09:16:38 PM »

Quote from: lilrick on July 20, 2008, 09:06:35 PM

you boys ever seen a grown man naked?

WTF

« **Reply #40 on:** July 20, 2008, 11:58:01 PM »

Quote from: lilrick on July 20, 2008, 09:06:35 PM

you boys ever seen a grown man naked?

Quote from: GT Jets on July 20, 2008, 09:16:38 PM

WTF

I think lilrick has been hanging out with beerjet

And according to the chart above I have over 750 hp !!

Forget the fact it was a Jacuzzi YJ pump, it still had an A impeller

.

« **Reply #41 on:** July 21, 2008, 10:56:26 AM »

Whats up Lilrick! We need to get to Parker! And I haven't seen any grown men naked lately, I got kicked out of the gym lockeroom again!

« **Reply #42 on:** July 21, 2008, 03:00:07 PM »

my motor on my thread was ran first with 990 heads and we got 625 hp 540 torgue at 6600.Its a 468 standerd stroke. the 990 heads flow cc's ##S are 264 at 500, 292 a 600, lift and they dont advertise it at 700 but is around 310 because you have to machine them for bigger springs like I had done to mine. they were also match ported around the runners. this was pretty expensive done by clay smith racing. I have the sheet to prove it. I can post if you you guys want. the efi is probly about a 50 hp gain over carbs. that being said. I bolted on the rhs 360 cc ported heads and that vacume pump and gaind 105 110 hp.

« **Reply #43 on:** July 22, 2008, 12:22:08 PM »

Sounds like you have a nice motor, I do have a few questions. your match porting and it was pretty expensive? Did he do a full port job? Did you dyno a nice carb like an 850 or a 950 to get the 50HP over the EFI? I have done this back to back on a dyno with F.A.S.T. EFI and I have a friend who works at Mo-Tech. We have seen 18hp once 22hp switching from a junk carb but a properly tuned carb can work very well. and being at a dyno and figuring out the volumetric efic. (how much air/fuel your cubic inches) can process at 100% you can tune an 850 annular carb pretty close to any EFI. Please don't get me wrong I think efi is a great thing I just look at my weekend at the river if I need a holley bowl gasket or I need someone with a laptop to remap my EFI program, which one can I find in the camp ground a little easier...What kind of boat is this motor in? You again prove my point a 454 can make over 500hp pretty easier, thanks for all the info! "D"

« **Reply #44 on:** July 22, 2008, 02:37:13 PM »

Kraig at BDS said I would see around 50 hp gain with my fast efi over my 2 660's. Speed O Motive told me the same thing. Im not basing it on anything so it could just be a selling point bs thing. I wanted it for other reasions tho. mostly cause my nitrous set up. There is no need to re tune it on the water after it came off the dyno, besides adjusting the idle and possibly the low mid rage if needed but even then you will only need to do it once. My 990 heads were only ported at the top of the runners no bowl work. my RHS heads were fully ported by speed o motive for 400$ but are alum.. for the work on my 990s was like 2 gs for all of the valves seats springs porting and maching for a 700 plus cam. they really came out nice but I wasnt expecting it to be that much. So Im holding on to those heads for my 71 nova build. I think hp is all in the top end, good heads and a solid roller will go a long way on any big block. I dont know my efic but my throdle body is 1060 cfm and my air fuel ratio is 11-13 across the board. Check out my other thread.
http://www.socaljetboats.com/index.php?topic=4372.0

« **Reply #45 on:** July 22, 2008, 10:12:47 PM »

Two grand and they didn't do any port work around the valves?

Some big gains can be had with only minor work in that area.

« **Reply #46 on:** July 23, 2008, 03:04:07 AM »

Sounds like you have a nice Engine set-up thanks again for all the info. What kinda boat is it in, does it run pretty good?

« **Reply #47 on:** October 25, 2008, 12:40:41 PM »

EFI is better for all around drivability - but I have NEVER seen an EFI out Horsepower a carb both properly tuned.

My buddy owns a well known tuning company, one that makes their business off of creating EFI modifications. They dyno cars efery day, and he sais the same thing, EFI outperforms carbs in every aspect except peek HP.

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