Best way to make 550HP out of a 502?
06-29-2005, 02:00 PM
#11
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Re: Best way to make 550HP out of a 502?
Originally Posted by Wobble
This is my Gen 4 motor and heads 9.4-1
RPM TRQ HP BSFC
3000 533 304 .64
3100 544 321 .62
3200 552 336 .59
3300 558 351 .60
3400 559 362 .59
3500 557 371 .59
3600 556 381 .58
3700 554 391 .59
3800 557 403 .56
3900 555 411 .57
4000 552 421 .57
4100 554 433 .56
4200 560 448 .56
4300 563 461 .56
4400 572 479 .56
4500 579 496 .55
4600 580 508 .55
4700 581 520 .56
4800 575 526 .57
4900 574 535 .54
5000 572 544 .56
5100 570 553 .56
5200 564 559 .55
5300 558 563 .54
5400 553 569 .55
5500 555 581 .56
5600 544 580 .56
509 gen4 block & heads. This is the boat setup (fat & 35 degrees)
850 hp holley, merlin single plane marine, ultradyne cam. ported heads, port matched, ceramic coated forged pistons.
RPM TRQ HP BSFC
3000 533 304 .64
3100 544 321 .62
3200 552 336 .59
3300 558 351 .60
3400 559 362 .59
3500 557 371 .59
3600 556 381 .58
3700 554 391 .59
3800 557 403 .56
3900 555 411 .57
4000 552 421 .57
4100 554 433 .56
4200 560 448 .56
4300 563 461 .56
4400 572 479 .56
4500 579 496 .55
4600 580 508 .55
4700 581 520 .56
4800 575 526 .57
4900 574 535 .54
5000 572 544 .56
5100 570 553 .56
5200 564 559 .55
5300 558 563 .54
5400 553 569 .55
5500 555 581 .56
5600 544 580 .56
509 gen4 block & heads. This is the boat setup (fat & 35 degrees)
850 hp holley, merlin single plane marine, ultradyne cam. ported heads, port matched, ceramic coated forged pistons.
Did you use a Flat tappet cam or Hydrolic cam? What was the specs for the cam that you used?
06-29-2005, 02:10 PM
#12
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Re: Best way to make 550HP out of a 502?
It's a custom grind Lunati/Ultradyne full hydraulic roller setup.
230*in 238* ex @.050"
114* lobe sep
.600" lift in/ex
1.7 rocker ratio
If you call Lunati, ask for Harold Brookshire formerly Ultradyne Cams. He is hard to get to. Never had any quality issues with Ultradyne, but I have seen some complaints here about Lunati quality. Mine is working fine so far.
RMbuilder here on OSO is an excellent source of info and would be worth contacting.
230*in 238* ex @.050"
114* lobe sep
.600" lift in/ex
1.7 rocker ratio
If you call Lunati, ask for Harold Brookshire formerly Ultradyne Cams. He is hard to get to. Never had any quality issues with Ultradyne, but I have seen some complaints here about Lunati quality. Mine is working fine so far.
RMbuilder here on OSO is an excellent source of info and would be worth contacting.
06-29-2005, 02:13 PM
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Re: Best way to make 550HP out of a 502?
BTW we also gasket matched the Merlin intake to the carb base gasket. Lot of extra material there.
06-29-2005, 07:10 PM
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Re: Best way to make 550HP out of a 502?
Originally Posted by dgduck13
Doug-
Thanks for all of your information. This is a great help. I might be emailing you in the furture about specific part numbers that you are using.
Thanks,
Don
Thanks for all of your information. This is a great help. I might be emailing you in the furture about specific part numbers that you are using.
Thanks,
Don
Anything you want to know about it I'll be more than happy to help.
Doug
06-29-2005, 07:34 PM
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Re: Best way to make 550HP out of a 502?
me too!!!
560hp,
502 gen6
roller cam, custom
emi exhaust, similar to the revs
dart single plane intake
hp500 carb, 800cfm
ported and polished rect port gm iron heads(did it myself)
its a fun project, Doug made more HP than I did, we built at about the same time. i stuck with more stock items than he did (i think!!)
either way, 550hp is attainable!!
kevin
560hp,
502 gen6
roller cam, custom
emi exhaust, similar to the revs
dart single plane intake
hp500 carb, 800cfm
ported and polished rect port gm iron heads(did it myself)
its a fun project, Doug made more HP than I did, we built at about the same time. i stuck with more stock items than he did (i think!!)
either way, 550hp is attainable!!
kevin
06-29-2005, 10:25 PM
#16
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Re: Best way to make 550HP out of a 502?
boatn70-
What Compression Ratio and Cam Profile are you running?
So you ported and polished your heads your self. That would be something that I would like to do. How did you learn? Also what did you use to test before and after the porting to make sure that they flowed better.
Thanks
Don
What Compression Ratio and Cam Profile are you running?
So you ported and polished your heads your self. That would be something that I would like to do. How did you learn? Also what did you use to test before and after the porting to make sure that they flowed better.
Thanks
Don
06-30-2005, 10:32 AM
#17
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Re: Best way to make 550HP out of a 502?
Originally Posted by boatn70
me too!!!
560hp,
502 gen6
roller cam, custom
emi exhaust, similar to the revs
dart single plane intake
hp500 carb, 800cfm
ported and polished rect port gm iron heads(did it myself)
its a fun project, Doug made more HP than I did, we built at about the same time. i stuck with more stock items than he did (i think!!)
either way, 550hp is attainable!!
kevin
560hp,
502 gen6
roller cam, custom
emi exhaust, similar to the revs
dart single plane intake
hp500 carb, 800cfm
ported and polished rect port gm iron heads(did it myself)
its a fun project, Doug made more HP than I did, we built at about the same time. i stuck with more stock items than he did (i think!!)
either way, 550hp is attainable!!
kevin
Doug
06-30-2005, 05:52 PM
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Re: Best way to make 550HP out of a 502?
Originally Posted by dgduck13
boatn70-
What Compression Ratio and Cam Profile are you running?
So you ported and polished your heads your self. That would be something that I would like to do. How did you learn? Also what did you use to test before and after the porting to make sure that they flowed better.
Thanks
Don
What Compression Ratio and Cam Profile are you running?
So you ported and polished your heads your self. That would be something that I would like to do. How did you learn? Also what did you use to test before and after the porting to make sure that they flowed better.
Thanks
Don
i followed alot of advice and read some good articles online. as far as flow goes...i based stock numbers on the chevy hiperf website, theres a listing of their flow tests. used that as stock then did my work and had a local guy flow them to see the increase. the best way however would be to flow before and after and be able to test and adjust in between. i didnt have that luxury so i just went with it...my numbers turned out pretty good
i only had one set of heads and just started working...obviously being careful of all the "dangerous" areas!!
it was a messy but fun project, took alot of time to do it!! let me know if your gonna try, i can post some links to the info i have found (if i can find again)
kevin
boatn70
06-30-2005, 05:54 PM
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Re: Best way to make 550HP out of a 502?
BTW, compression was at 8.8:1, block was decked at .050 and gaskets at .039. i did the comb. chamber too, to elimate any detination possibilities.
cam was 230/232 .610/.632 @.050 custom
cam was 230/232 .610/.632 @.050 custom
06-30-2005, 09:12 PM
#20
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Re: Best way to make 550HP out of a 502?
Kevin-
Thanks for the info. If you get time please post some of the links you used. I am not planning on taking the motors of of the boat untill I get back from a boating trip to minnesota at the beginning of September, so I have lots of time for research.
Thanks again,
Don
Thanks for the info. If you get time please post some of the links you used. I am not planning on taking the motors of of the boat untill I get back from a boating trip to minnesota at the beginning of September, so I have lots of time for research.
Thanks again,
Don
Last edited by Maritime_Eng; 06-30-2005 at 09:19 PM.
