2020 Race Update
+5
bracketchev1221
g3chevy / Mr Pontiac
Iggy
fasrnur
Keith Seymore
9 posters
G3GM :: G3 :: General Discussion
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2020 Race Update
by Keith Seymore Mon Sep 28, 2020 4:06 pm
Finally made it out this year with a new motor.
Broke the end off the crank at Indy last year. Got the new motor completed, dyno'd, and dropped in the car with a week to spare before heading to the NMCA (National Muscle Car Association) Finals at Indy this past weekend. (No sense waiting until the very last minute - lol - the global pandemic put the kabosh on my ability to expedite the build).
The new motor is a Scott Williams built 572 cu in big block based on a GM Bow Tie Pro Stock CNC block and Callies crank. I'm re-using my AFR heads, Dart intake and Dominator from the previous 555. Engine dyno'd at 850 HP at 6500 rpm and 740 ft-lbs torque from about 4800 to 5800 rpm.
That translated to a number of low ten second passes at 3900 lbs. I ran the 10.25 index for my Nostalgia Muscle class and was shooting for 10 flat in the True Street categories. Best passes in True Street trim were 10.02 and 10.08, and I had an "accidental" 9.996 when I ran it out the back in NMC. The car has been 9.85 in testing under perfect conditions (mid November temps, removed the extra seats, no front bumper, no exhaust, hot tuneup on hot fuel) so this was the first 9 second pass during competition and under normal conditions (normal tune, through the mufflers on street tires).
I got some favorable press in the form of an internet mention during the daily highlights; as a result of that honorable mention we did a photo shoot for future print publication in the NMCA magazine, timing tbd.
K
https://www.nmcadigital.com/2020/09/25/friday-coverage-nitrous-supply-nmca-world-street-finals-presented-by-chevrolet-performance/
Broke the end off the crank at Indy last year. Got the new motor completed, dyno'd, and dropped in the car with a week to spare before heading to the NMCA (National Muscle Car Association) Finals at Indy this past weekend. (No sense waiting until the very last minute - lol - the global pandemic put the kabosh on my ability to expedite the build).
The new motor is a Scott Williams built 572 cu in big block based on a GM Bow Tie Pro Stock CNC block and Callies crank. I'm re-using my AFR heads, Dart intake and Dominator from the previous 555. Engine dyno'd at 850 HP at 6500 rpm and 740 ft-lbs torque from about 4800 to 5800 rpm.
That translated to a number of low ten second passes at 3900 lbs. I ran the 10.25 index for my Nostalgia Muscle class and was shooting for 10 flat in the True Street categories. Best passes in True Street trim were 10.02 and 10.08, and I had an "accidental" 9.996 when I ran it out the back in NMC. The car has been 9.85 in testing under perfect conditions (mid November temps, removed the extra seats, no front bumper, no exhaust, hot tuneup on hot fuel) so this was the first 9 second pass during competition and under normal conditions (normal tune, through the mufflers on street tires).
I got some favorable press in the form of an internet mention during the daily highlights; as a result of that honorable mention we did a photo shoot for future print publication in the NMCA magazine, timing tbd.
K
https://www.nmcadigital.com/2020/09/25/friday-coverage-nitrous-supply-nmca-world-street-finals-presented-by-chevrolet-performance/
Last edited by Keith Seymore on Wed Oct 14, 2020 1:43 pm; edited 1 time in total
Keith Seymore- G3GM Member
- Street Cred : 11
Limey SE and fasrnur like this post
Re: 2020 Race Update
by fasrnur Mon Sep 28, 2020 8:26 pm
Congratulations sir. That's one hell of a beast for sure.
fasrnur- G3GM Enthusiast
- Street Cred : 9
Re: 2020 Race Update
by Iggy Tue Sep 29, 2020 9:58 am
Congratulations! I completely understand the trouble getting a race engine put together in these times. I had two small blocks machined in February, 400 for a restore on a 1978 GMC and a 383 for off-road Jimmy. Then the pandemic hit and things move at a snails pace. Everything is fitted for final assembly now, hope to break-in before the snow comes!
Iggy- G3GM Member
- Street Cred : 15
Re: 2020 Race Update
by g3chevy / Mr Pontiac Tue Sep 29, 2020 1:30 pm
Congrats! Love to see coverage of our generation of vehicles. That car of yours is a beast! Well deserved exposure!
g3chevy / Mr Pontiac- Donating Member
- Street Cred : 32
Re: 2020 Race Update
by bracketchev1221 Wed Sep 30, 2020 1:35 pm
Glad to hear the car ran well out of the box and went back home in one piece. I would never build another engine without straightening it out on the dyno first. Its not worth putting it in the car and testing to find out something is not right.
bracketchev1221- G3GM Enthusiast
- Street Cred : 15
Re: 2020 Race Update
by Dinomyte Wed Sep 30, 2020 6:33 pm
Keith - I live my car racing dreams vicariously through you and Ray and Richard P(#43)
Keep it up.
Keep it up.
Dinomyte- Donating Member
- Street Cred : 11
Re: 2020 Race Update
by Limey SE Wed Sep 30, 2020 11:33 pm
Great to see Keith Keep up the great work on it
___________________________________________
1977 Chevelle SE x2
One Mild original
one Wild NON original
Anthony
Limey SE- Management
- Street Cred : 97
Re: 2020 Race Update
by REVINKEVIN / Mr. 600+HP Thu Oct 01, 2020 11:06 pm
You made the G3 crowd proud. What MPH does your new setup run?
REVINKEVIN / Mr. 600+HP- G3GM Enthusiast
- Street Cred : 19
Re: 2020 Race Update
by Keith Seymore Wed Oct 14, 2020 1:42 pm
Thanks, guys -
MPH is normally around 136mph. Race weight is 3950 lbs with me in it.
I'd like to spec out a new transmission torque converter and get that tested before the season ends.
I'm also in the market for new instrumentation, so please check out that thread. Feel free to comment here if you have any recommendations.
K
REVINKEVIN wrote:You made the G3 crowd proud. What MPH does your new setup run?
MPH is normally around 136mph. Race weight is 3950 lbs with me in it.
I'd like to spec out a new transmission torque converter and get that tested before the season ends.
I'm also in the market for new instrumentation, so please check out that thread. Feel free to comment here if you have any recommendations.
K
Keith Seymore- G3GM Member
- Street Cred : 11
Re: 2020 Race Update
by Limey SE Wed Oct 14, 2020 4:43 pm
Well Well How about this Dakota Digital now offers Gauges for the 1973 -1977 Malibu Chevelle El Camino and Monte Carlo's HELL TO THE YES Choice of Red Blue or Aquamarine(ish) colors |
NO MORE OVERPRICED round gauge clusters ever
https://www.dakotadigital.com/index.cfm/page/ptype=product/product_id=1271/category_id=424/mode=prod/prd1271.htm
NO MORE OVERPRICED round gauge clusters ever
https://www.dakotadigital.com/index.cfm/page/ptype=product/product_id=1271/category_id=424/mode=prod/prd1271.htm
___________________________________________
1977 Chevelle SE x2
One Mild original
one Wild NON original
Anthony
Limey SE- Management
- Street Cred : 97
Re: 2020 Race Update
by Limey SE Fri Oct 30, 2020 11:39 am
Keith did you get a Time slip for that 9.86 Pass interesting to see reaction, 60 ft and 1/8 full 1/4 times ?
___________________________________________
1977 Chevelle SE x2
One Mild original
one Wild NON original
Anthony
Limey SE- Management
- Street Cred : 97
Re: 2020 Race Update
by 1975 S3 Sat Nov 07, 2020 9:42 pm
Hard work and persistence pays off...well done
1975 S3- Donating Member
- Street Cred : 5
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