posted December 30, 2001 01:41 PM
I am looking for a short block to run in my ump mod for next year. I bought the car complete last year with a 406 flat top pistons with steel 461 heads on alky. Run a 5.43 gear on a high banked 1/4 dirt track that was dry slick most of the year. Turned 5700 to 6000 rpm. were going to change the gear up to a 5.67 and try to get the rpm up a little. 6800 to 7000. I have been looking at the JR motorsports shortblocks and was wondering if anyone used them and had any feedback. were also going to bore last years engine .40 over and rebuild it as a back up. Thanks
HEYWOOD Dirt Roller
Total posts: 8
posted January 04, 2002 08:15 PM
CALL HOVIS DYNO TUNED RACING ENGINES THEY ARE THE BEST GOING ALL THE TOP GUYS IN UMP RUN THEM JIMMY OWENS CHAD KINDER JOHN SEETS ARE JUST A FEW PLUS MANY MORE ASK FOR AL OR ASA HOVIS 1-636-278-4247
modified17 Dirt Roller
Total posts: 20
posted January 05, 2002 07:27 PM
Just wanted to let you know......changing your gear from 5.43 to a 5.67 will probably only gain you 250-350 rpm max. A 5.83 should gain about 500-600 rpm's over the 5.43.
Coolhand Dirt Full Roller
Total posts: 42
posted January 06, 2002 02:03 PM
Thanks guys im going to put together a 5.67 and a 5.83 to go with my 5.43 6.00 5.14 and 6.20 gear sets.