496 to be DYNO'D!

[Vortecpro]

Originally Posted by 69GMC910

Short delay on the dyno.... Should be friday or saturday...!
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Sorry for the delay on my end, having some problems with my dyno, I think we have figured it out and will have some numbers soon, the cam is 570 608 238/248, BTW my guess is 700, any way you want to look at it, your truck could run 10s with this very streetable engine.

[69GMC910]

my bad on the cam specs...

[Super73]

I am always interested in modeling motors in performance trends. Mind sharing actual head flow data at. 300 .500 .600? Also. Is the motor set up with factory tolerances or a little looser? Factory widange or does it have a tray and good pan?
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[Boogie_Man]

Ooo Emm Gee... That vid was sick! Looking forward to hearing your numbers dude!

[Vortecpro]

Originally Posted by Super73

I am always interested in modeling motors in performance trends. Mind sharing actual head flow data at. 300 .500 .600? Also. Is the motor set up with factory tolerances or a little looser? Factory widange or does it have a tray and good pan?
Posted via Mobile Device

Flow @ 28 inches, 4.310 bore. .200 171 .300 233 .400 281 .500 317 .550 323. 270 CC runner. Deep pan. Very low drag bottom end. 600 HP by 4900 RPM, 700 HP @ 6300 RPM 238@.050 HYD roller.

[shawnt]

Hmm, with flow numbers I change to 713 hp @ 6400.

All these 500hp guess wont get the virtual high five. It WILL be 665+ I guarantee that

[ripdog28]

If Mark says 700 @ 6300, that is with in a few numbers. He has built more then enough and flowed way too many heads to know what itll make.

I want him to do my next build.

[hotrod 80]

662 hp

[Super73]

Numbers PT gave are below running 91 octane and 165* coolant temps.

Adjusting windage and setting the bottom end to a lower drag set up netted a pinch over 30ftlbs and 30hp through out the full curve bringing 641ftlbs @ 4,600 and 629hp @ 5,600.

Adjusting headflow after adjusting the windage/friction netted 642ftlbs @ 4,500 and 630hp at 5,700. Keep in mind, I don't have updated flow numbers for the exhaust which could move things higher if I had them. Also, wish I had .600 numbers to use over .550. I have found the program to be most accurate using .300 .500 and .600. I know the intake side of the cam never sees that lift, but it just works better. Could be showing less power with that as well.

Also, Mark did not provide all the details on the cam. IE intake centerline and LSA. I am going off previously posted LSA and a 112 ICL.

Unfortunately the program is only as good as the info provided. It has proven itself time and time again when ALL the accurate data is given. But there is a lot of guess work here. I hope it is conservative and you get to that 640+ftlbs @ 4,900 and 700hp @ 6,300 Mark is mentioning. I know this isnt the first motor Mark has built.

[Super73]

One additional comment, If you take the power curve PT gave, move it up 300rpm which is closer to where Mark says it will make peak TQ
642ftlbs@4,900=599hp
580ftlbs@6,000=662hp
536ftlbs@6,400=653hp

[RatPwrd72]

I'll go with Mark over the air dyno any day. That is all.

[69GMC910]

My guess is 711hp, 684tq
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[C20-67_N_MO]

Not going there at all.

SBC forever!

Sounds like you'll have a beast no matter what the numbers will be.

Have fun.

[Vortecpro]

Originally Posted by Super73

One additional comment, If you take the power curve PT gave, move it up 300rpm which is closer to where Mark says it will make peak TQ
642ftlbs@4,900=599hp
580ftlbs@6,000=662hp
536ftlbs@6,400=653hp

My 9.5 compression 049 headed 496s with a 238 @ .050 HYD rollers go 670 @ 6200 RPM and 660 TQ.

[ripdog28]

Originally Posted by Vortecpro

My 9.5 compression 049 headed 496s with a 238 @ .050 HYD rollers go 670 @ 6200 RPM and 660 TQ.

[gearys 5600]

sign me up for a steel headed 9-1 comp, small cam, 496 that makes 700 H.P.

Sounds like I wasted a ton of money bulding my 496 !! 13.5 to 1 comp, brodix cnc'd bb2 extras, big solid roller, super victor,1150 dominator that made a little over 800 h.p.

[Super73]

Originally Posted by Vortecpro

My 9.5 compression 049 headed 496s with a 238 @ .050 HYD rollers go 670 @ 6200 RPM and 660 TQ.

Again, I don't have the full scoop on the motor. Garbage in = Garbage out. The program has proven itself with in 2% on quite a few wild motors. Not saying this build won't make what you are saying, just using the info that I have.

[68Redhead]

Wow Mark, do you have payment plans?

Can't wait to see the numbers, I keep going back and forth between a 454 and 496 for my 'velle!
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[Vortecpro]

Originally Posted by gearys 5600

sign me up for a steel headed 9-1 comp, small cam, 496 that makes 700 H.P.

Sounds like I wasted a ton of money bulding my 496 !! 13.5 to 1 comp, brodix cnc'd bb2 extras, big solid roller, super victor,1150 dominator that made a little over 800 h.p.

How about a 11.5 comp, 049 headed solid roller, 4150 carbed, 800 HP engine....

[gearys 5600]

Originally Posted by Vortecpro

How about a 11.5 comp, 049 headed solid roller, 4150 carbed, 800 HP engine....

What did you have this engine in ?

What were the specs on the car/truck , weight, gear ratio, and what are the numbers at the track ?

Dyno sheets don't mean much to me, it's real easy to inflate the numbers.
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[Vortecpro]

Originally Posted by gearys 5600

What did you have this engine in ?

What were the specs on the car/truck , weight, gear ratio, and what are the numbers at the track ?

Dyno sheets don't mean much to me, it's real easy to inflate the numbers.
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Generally this is where I would go into defensive mode, BUT, I did see the picture of your beautiful L78 camaro and I do believe you do deserve some respect. The 800 HP oval port 11.5 compression engine has not been down the track yet, my customer will have runs on it coming up this spring. To me, I like to know the (racing background) of the people questioning my dyno numbers. So I think its only fair I state my background. I machine and build and test my own engines, everything is machined in house with the crankshaft as an exception. 1. Two strait hot street championships (550 inch NA 10 inch tire 3350 pounds) both ends of the records, won every race except for 1 over a two season span, as an engine builder. 2. The fastest full weight, small tire, oval port (GM) production blocked chevelles in country come out of my shop. 3. Just for you I have an example of a Vortecpro powered 468 NA camaro, I think you just might be able to identify with. NA 468 9.40 @ 142.40 1.28 60 on the foot brake @ 1670 feet DA @ KCIR. BTW on that dyno you questioned the HP of, it made (the 468) 45 less hp than yours, 795 HP. Happy reading

[mud.man.rj]

9.40 and foot braking is quite the wow factor.

[smoknbarrels]

Originally Posted by 69GMC910

Please make yer estimates for HP and TQ! Engine should hit the dyno this wknd or early next week.

496
10.2CR
AFR 265's
.578I
.608E
RPM Air Gap
850 Holley

Closest guess wins a virtual high five!

910

This at 700hp, (not saying it's not) but I must have really been low balled on my 496, at 630HP. my set-up:
Holley 850 DP 4150
10.7 CR
RPM Air Gap
Performer RPM oval heads
2 inch primaries headers
Roller rockrs/cam with a 304HR comp cams
looser bearings

Your AFR heads flow a bit better, would it make that much of a difference? eventhough I have more lift I still don't flow quite as good.

[moggey01]

Originally Posted by Vortecpro

Generally this is where I would go into defensive mode, BUT, I did see the picture of your beautiful L78 camaro and I do believe you do deserve some respect. The 800 HP oval port 11.5 compression engine has not been down the track yet, my customer will have runs on it coming up this spring. To me, I like to know the (racing background) of the people questioning my dyno numbers. So I think its only fair I state my background. I machine and build and test my own engines, everything is machined in house with the crankshaft as an exception. 1. Two strait hot street championships (550 inch NA 10 inch tire 3350 pounds) both ends of the records, won every race except for 1 over a two season span, as an engine builder. 2. The fastest full weight, small tire, oval port (GM) production blocked chevelles in country come out of my shop. 3. Just for you I have an example of a Vortecpro powered 468 NA camaro, I think you just might be able to identify with. NA 468 9.40 @ 142.40 1.28 60 on the foot brake @ 1670 feet DA @ KCIR. BTW on that dyno you questioned the HP of, it made (the 468) 45 less hp than yours, 795 HP. Happy reading

What Hot street class are you talking about? I know NMCA had it and switched the name for the N/A class. Just curious we ran that stuff with a 318 engine and a 5 speed.

[Vortecpro]

Originally Posted by smoknbarrels

This at 700hp, (not saying it's not) but I must have really been low balled on my 496, at 630HP. my set-up:
Holley 850 DP 4150
10.7 CR
RPM Air Gap
Performer RPM oval heads
2 inch primaries headers
Roller rockrs/cam with a 304HR comp cams
looser bearings

Your AFR heads flow a bit better, would it make that much of a difference? eventhough I have more lift I still don't flow quite as good.

Theres alot more to consider than just air flow, the AFR 265 does demoralize the RPM heads, esspecially when your only lifting the valve .570. This engine will peak @ 6400 RPM when its all said and done, thats something else to consider, I have not had much luck with the comp hyd roller lobes, remember Ive been developing these exact same engines for 7 years now. I dont think you got hosed, I just know what goes into my engine, and its a little more than an average rebuild. At this point Jarred I think I will ask Harold Bettes to come down and supervise these final tests and write a report on this engine and how it was tested. So stay tuned and lets see what we end up with.