500 Ci. Stroker Specs Evaluation and Recommendations

[dpaul63]

Gentlemen, I would greatly appreciate it if you would review the build sheet and dyno results on my 500 Ci stroker and give me some advice on how I can change the HP verses TQ ratio on my dyno results. I currently have it up for sale on the performance parts forum, but it would be much easier to correct what I assume are head and cam issues on my engine, than to buy a 572 hemi just to prove mine is bigger!. As a street engine it definitely fits the bill, but the horsepower numbers concern me when you take into account that it makes 619 ft. lbs of torque @ 4000 rpm, but only tops out @ 517 HP at 5100 RPMs. Please take a look at the numbers and offer any advice on how I can achieve a better HP to TQ ratio. I'm assuming some may look at the numbers and not see a real issue since it will be a street only car, but I have a lot of change invested in my 68 GTX and I need an engine that will help me sell this car without taking a huge loss.

 

[Lionized]

That's a helluva stump puller! Was your engine builder present during the dyno runs? No mention of carb/intake/head combination that you're using with that cam...

 

[IQ52]

It should be a very good street engine just as it is. It's going to run really good, flatten your lips into your teeth, jerk your cheeks and the corners of your mouth back to your ears when pulling away from a stop sign. And you want what else, 170mph?

Yep, it does have a toy camshaft and entry level cylinder heads. I cannot decipher the intake manifold type though.

 

[lewtot184]

put a 2.94 gear in it and drive it.

 

[dpaul63]

Yes, Harold from R&R ran the dyno runs. I am running a Holley 750 HP double pumper, Edelbrock RPM dual plane intake, and Edelbrock E-Street heads out of the box.

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I appreciate the input! Harold installed Edelbrock E-Street heads out of the box. I was thinking of trying Trick Flow 270 heads which won't be out until July or August and new cam that will raise the HP and hold raise the RPM a bit before I hit max TQ, but still keep it a well behaved street engine. The top speed isn't a priority since it won't see any track time, but I'd like to leave a nice impression on her next owner. I thought I'd hand it down to my son, but my old lady says that it's either it or her. I can get a new old lady, but I can't get back half my Marine Corps retirement, nor half of everything we have.

 

[IQ52]

I've received that ultimatum twice.

When I got rid of all my possessions they didn't like me having, they realized it wasn't the possessions they didn't like, it was their owner. So they shed the owner after he shed his prize possessions, four Challengers and two Road Runners.

You already know what to do to change the engine. When you bolt on a small cam, small carburetor, and heads that have a maximum horsepower capability of 520-540HP OOTB. You are only going to get what you already got.

Good luck with everything.

 

[dpaul63]

IQ52, the thought has crossed my mind, I'll reserve my judgement on whether to keep her until my GTX is out of paint and body. It's always good to get fresh eyes on a problem. Sometimes I don't know what I thought I knew!

 

[69 GTX]

Jim knows his stuff. He's getting close to 600HP & 550 ft lbs out of my lowly 440. BTW HP is only good if you can put it to the ground, otherwise it's just a # on a piece of paper. My 2 cents.

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JIM! 12:03 am this morning! Do you ever sleep?

 

[66Satellite47]

Check what the bowl looks like on the heads, maybe a cleanup there would help. The 500" motors seem to want fairly large cams. At least mine responded to a bigger antique cam I had. The 500" street motor in the car I bought had a Comp XS274S cam and dyno numbers about the same as yours. I put in the antique 585 Cam Dynamics cam and a Victor intake and picked up 7 tenths and 10 mph. Small cams make great torque & fair HP but they want more air, bigger cams. My $.02.

 

[Derwud]

IQ52 hit the nail on the head.. Both the heads and cam are your limiting factors. But I would drive and see how it runs and just talk TQ numbers.. The motor he built for 69GTX has me drooling and sent his specs to my Engine builder..

 

[HT413]

You're already producing more tq/hp than you can put to the pavement anyway, so why not drive it as is? More power would be nice for comparing dyno sheets, but not a whole lot more.

 

[69 GTX]

What he said!

 

[IQ52]

Jim knows his stuff. He's getting close to 600HP & 550 ft lbs out of my lowly 440. BTW HP is only good if you can put it to the ground, otherwise it's just a # on a piece of paper. My 2 cents.

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JIM! 12:03 am this morning! Do you ever sleep?

I'm usually at the shop around 6:00AM Mountain Time and leave around 7:30PM. But there are times it's 5:00AM one day to 2:00AM the following day.

 

[dpaul63]

HT413, you have a very valid point. If it were not for the fact that you can't swing a dead cat around here without hitting a Mopar stroker that's packing R&R engines that do double duty (street/strip), I'd leave it alone and let my body and frame shops work speak for itself. Since my build calls for tubbing for a minimum of 230x22s with a new back half, and all new floor pans, torque boxes and tubs, why not put a bit more giddy up and go!

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IQ52, now that I know your name is Jim and you have done a hell of a job with a 440 build for 69GTX, I'd like to see if you think a Edelbrock Victor series single plane manifold would put max TQ in a place where it would be of little use on the street. I'd also be interested in a cam recommendation that would help compliment my build.

 

[Mike67]

I'm not an engine builder by any stretch of the imagination, but all of the articles I have read on dyno test for 499+ ci pump gas motor, they have all gone to a single plane and 850-950 cfm carb....I would think on that displacement a 750 might be holding back your hp as well as what the others have posted...just $.02...here is the link to the Hughes build that sounded pretty awesome...
http://www.hughesengines.com/TechArticles/6bigblockstroker6pakdynotest7279.php

 

[IQ52]

HT413, you have a very valid point. If it were not for the fact that you can't swing a dead cat around here without hitting a Mopar stroker that's packing R&R engines that do double duty (street/strip), I'd leave it alone and let my body and frame shops work speak for itself. Since my build calls for tubbing for a minimum of 230x22s with a new back half, and all new floor pans, torque boxes and tubs, why not put a bit more giddy up and go!

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IQ52, now that I know your name is Jim and you have done a hell of a job with a 440 build for 69GTX, I'd like to see if you think a Edelbrock Victor series single plane manifold would put max TQ in a place where it would be of little use on the street. I'd also be interested in a cam recommendation that would help compliment my build.

You need more than an intake manifold change...........but here is a direct comparison between a ported RPM intake and a Victor that has the plenum, right under the carburetor, lightly blended. Mind you, not ported, but any sharp points rounded off. Both intakes were gasket matched to standard port size.

........496 stroker, 10.3:1 compression, 91 octane, Edelbrock RPM heads ported to flow 292 cfm @ .500" and 309 cfm @ .600" lift, Lunati solid street roller 249/255 @ .050, .585"/.600" w/1.5:1 rocker arms, 950cfm Quick Fuel Q950 carburetor.

RPM..............TQ/HP RPM intake............TQ/HP Victor intake..............yours

3000.............541/309........................530/303..............................N/A
3200.............570/347........................554/337...........................605/369
3400.............614/398........................591/383...........................611/395
3600.............639/438........................612/419...........................610/418
3800.............638/462........................613/443...........................615/445
4000.............639/486........................615/468..........................620/472
4200.............628/502........................613/490...........................605/484
4400.............611/512........................615/516...........................597/501
4600.............607/531........................616/540...........................580/508
4800.............607/554........................614/561...........................562/514
5000.............609/579........................623/593..........................538/512
5200.............614/608........................620/614...........................520/515
5400.............597/614........................614/631...........................491/505
5500.............596/624........................611/640...........................480/503
5600.............590/629........................602/642
5800.............578/638........................584/645
5900.............570/640........................582/654
6000.............550/628........................565/645
6200.............535/631........................549/649

What do you think, is the torque of little use?

 

[dpaul63]

IQ52, I greatly appreciate your help! I'll keep my RPM intake and work with Comp Cams to spec out a cam that will work with the Trick Flow heads I want. FiTech has a TB EFI system that I'm very interested in that will handle up to 1,200 HP. I have time before my body work is finished, so now I have a much better understanding of what I should be working toward.

 

[IQ52]

IQ52, I greatly appreciate your help! I'll keep my RPM intake and work with Comp Cams to spec out a cam that will work with the Trick Flow heads I want. FiTech has a TB EFI system that I'm very interested in that will handle up to 1,200 HP. I have time before my body work is finished, so now I have a much better understanding of what I should be working toward.

Check with FiTech as to their recommended intake manifold for their system. They may recommend a single plane as a better fit for fuel injection.

 

[Derwud]

IQ52, I greatly appreciate your help! I'll keep my RPM intake and work with Comp Cams to spec out a cam that will work with the Trick Flow heads I want. FiTech has a TB EFI system that I'm very interested in that will handle up to 1,200 HP. I have time before my body work is finished, so now I have a much better understanding of what I should be working toward.

You should be fine with the RPM and FiTech, their system does not seem to be as sensitive to manifold as other system are. They better not be, since I plan on using the same set-up.