How high do you spin your 4.15 or 4.25 RB stroker? - Moparts Forums

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How high do you spin your 4.15 or 4.25 RB stroker? #1818452 05/04/15 01:46 PM 05/04/15 01:46 PM
Joined: Jan 2003 Posts: 15,439 Val-haul-ass... eventually B BradH OP Taking time off to work on my car
BradH OP Taking time off to work on my car B Joined: Jan 2003 Posts: 15,439 Val-haul-ass... eventually	Sheer (morbid?) curiosity... Do you build 'em to go much over 7K on the big end, even if you're shifting them below that RPM?

Re: How high do you spin your 4.15 or 4.25 RB stroker? [Re: BradH] #1818454 05/04/15 01:49 PM 05/04/15 01:49 PM
Joined: Jan 2003 Posts: 19,363 Las Vegas Al_Alguire I Live Here
Al_Alguire I Live Here Joined: Jan 2003 Posts: 19,363 Las Vegas	When we ran the B1 all out we shifted it at 8400. I am trying to finish up my 605 and expect to be shifting it around 8200 or so. "I am not ashamed to confess I am ignorant of what I do not know." "It's never wrong to do the right thing"

Re: How high do you spin your 4.15 or 4.25 RB stroker? [Re: BradH] #1818466 05/04/15 02:01 PM 05/04/15 02:01 PM
Joined: Aug 2003 Posts: 43,176 Bend,OR USA C Cab_Burge I Win
Cab_Burge I Win C Joined: Aug 2003 Posts: 43,176 Bend,OR USA	My first pump gas stroker motor 512/518 C.I. like to be shifted at or above 7000 to 7300 RPM. That motor made peak HP at 5600 RPM and peak torque at 4500 RPM on the engien dyno At the track it went fastest shifting at or above 7000 RPM, the converter, gear ratio, tire size and all the other variables do come into play Last edited by Cab_Burge; 05/04/15 02:02 PM. Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)

Re: How high do you spin your 4.15 or 4.25 RB stroker? [Re: BradH] #1818472 05/04/15 02:06 PM 05/04/15 02:06 PM
Joined: Jun 2003 Posts: 9,225 Charleston S sixpackgut Drag Week Mod Champion
sixpackgut Drag Week Mod Champion S Joined: Jun 2003 Posts: 9,225 Charleston	6700 Gen 3 power 6.22@110, 9.85@135 Follow @g3hemiswap on instagram performance only racing, CRT, ultimate converter, superior design concepts, ThumperCarbs

Re: How high do you spin your 4.15 or 4.25 RB stroker? [Re: BradH] #1818477 05/04/15 02:11 PM 05/04/15 02:11 PM
Joined: Jan 2003 Posts: 31,034 Oregon A AndyF I Win
AndyF I Win A Joined: Jan 2003 Posts: 31,034 Oregon	My 514 dyno motor makes peak power at 7000 rpm so we shut it off fairly quickly after that. It is a 4.15 stroke with a Callies crank and 7.100 Oliver rods so I'm sure the shortblock could handle more rpm, but it just runs out of air. It still makes 900+ hp at 7000 but if I had bigger heads on it then we could wind it out a bit more and make even more power. The valvetrain is most likely good to something well past 7000 rpm. I have Jesel rocker arms, a Jesel belt drive, big valve springs and 1/2 inch pushrods so it would spin higher if I had more airflow.

Re: How high do you spin your 4.15 or 4.25 RB stroker? [Re: BradH] #1818498 05/04/15 02:24 PM 05/04/15 02:24 PM
Joined: Jul 2004 Posts: 1,770 Pa W Wv68charger top fuel
Wv68charger top fuel W Joined: Jul 2004 Posts: 1,770 Pa	572 shifting at 7300 trapping at 7500

Re: How high do you spin your 4.15 or 4.25 RB stroker? [Re: BradH] #1818500 05/04/15 02:25 PM 05/04/15 02:25 PM
Joined: Oct 2003 Posts: 4,013 South Park, Pa. 68LAR master
68LAR master Joined: Oct 2003 Posts: 4,013 South Park, Pa.	4.15 stroker here. I usually spin it to around 65 at the traps, but have gone to 7 a couple times between shifts, unintentionally... 4 speed street legal. Best time 10.99 @ 124 mph on 93 octane pump gas @ 3926# total weight

Re: How high do you spin your 4.15 or 4.25 RB stroker? [Re: BradH] #1818510 05/04/15 02:37 PM 05/04/15 02:37 PM
Joined: Jan 2003 Posts: 19,363 Las Vegas Al_Alguire I Live Here
Al_Alguire I Live Here Joined: Jan 2003 Posts: 19,363 Las Vegas	I think ET and HP numbers might play a role here too Small bore hp=RPM!! "I am not ashamed to confess I am ignorant of what I do not know." "It's never wrong to do the right thing"

Re: How high do you spin your 4.15 or 4.25 RB stroker? [Re: Al_Alguire] #1818522 05/04/15 02:49 PM 05/04/15 02:49 PM
Joined: Jun 2003 Posts: 52,972 Romeo MI MR_P_BODY Master
MR_P_BODY Master Joined: Jun 2003 Posts: 52,972 Romeo MI	I was gonna have to spin my B1m/c 514 to 8800-9000 to make it efficient

Re: How high do you spin your 4.15 or 4.25 RB stroker? [Re: BradH] #1818671 05/04/15 06:14 PM 05/04/15 06:14 PM
Joined: Mar 2006 Posts: 9,836 MI, usa dvw master
dvw master Joined: Mar 2006 Posts: 9,836 MI, usa	My 572, make the shift at 6900 runs 7100 through the traps. Doug

Re: How high do you spin your 4.15 or 4.25 RB stroker? [Re: dvw] #1818714 05/04/15 07:18 PM 05/04/15 07:18 PM
Joined: Jan 2013 Posts: 174 H hustlin hoosier member
hustlin hoosier member H Joined: Jan 2013 Posts: 174	We spin our 632 in 7900 to change gears and out the back 8300. It is 4.600 bore and 4.75 stroke. we are in the process of building a 565 in motor 4.600 bore and 4.25 stroke with our new head. I think we will probably be shifting around 8500 and be around 9000 on the big end.

Re: How high do you spin your 4.15 or 4.25 RB stroker? [Re: BradH] #1818841 05/04/15 09:29 PM 05/04/15 09:29 PM
Joined: Jan 2003 Posts: 19,363 Las Vegas Al_Alguire I Live Here
Al_Alguire I Live Here Joined: Jan 2003 Posts: 19,363 Las Vegas	What block are you using to get q 4.600 bore? Assume it is the Indy 4.84" BS deal. Wish there were some decent heads for that block, like maybe a 4.84BS Predator head. "I am not ashamed to confess I am ignorant of what I do not know." "It's never wrong to do the right thing"

Re: How high do you spin your 4.15 or 4.25 RB stroker? [Re: BradH] #1818856 05/04/15 09:49 PM 05/04/15 09:49 PM
Joined: Jan 2003 Posts: 9,999 Frostbitefalls MN (Rocky&Bullw... gregsdart master
gregsdart master Joined: Jan 2003 Posts: 9,999 Frostbitefalls MN (Rocky&Bullw...	7100 shifts, 7800 in the traps with shorter tires. 4.15 stroke, Manley H beams, 2432 bob weight. 8..603 156 mph best, 2905 lbs 549, indy 572-13, alky

Re: How high do you spin your 4.15 or 4.25 RB stroker? [Re: gregsdart] #1818918 05/04/15 10:53 PM 05/04/15 10:53 PM
Joined: Aug 2007 Posts: 998 Clinton Township, Michigan D Dartin super stock
Dartin super stock D Joined: Aug 2007 Posts: 998 Clinton Township, Michigan	Shift my 540 at 7200 and trap about 7600. Callie's crank and Compstar rods. Been 9.35@143. Looking for more this year. Randy

Re: How high do you spin your 4.15 or 4.25 RB stroker? [Re: dvw] #1819039 05/05/15 12:30 AM 05/05/15 12:30 AM
Joined: Dec 2008 Posts: 742 Oak Harbor, WA W Wicked49670dart super stock
Wicked49670dart super stock W Joined: Dec 2008 Posts: 742 Oak Harbor, WA	My 496, I shift @ 6800 and cross @ 7200! 70 Dart 3400 496 New Best 6.15@110.37 660ft, 9.76@135 with a 1.34 60ft

Re: How high do you spin your 4.15 or 4.25 RB stroker? [Re: BradH] #1819046 05/05/15 12:39 AM 05/05/15 12:39 AM
Joined: Jun 2005 Posts: 6,257 gulfport, ms, west mi rowin4 master
rowin4 master Joined: Jun 2005 Posts: 6,257 gulfport, ms, west mi	Gee, I feel like a small block guy with only a 505 stroked pump gas 440. I shift at 68 and cross the line at 67. It will easily go to 74 but I see no need to go that high. it's ok to butt heads, just don't do it with a butthead

Re: How high do you spin your 4.15 or 4.25 RB stroker? [Re: rowin4] #1819082 05/05/15 01:15 AM 05/05/15 01:15 AM
Joined: Jan 2013 Posts: 174 H hustlin hoosier member
hustlin hoosier member H Joined: Jan 2013 Posts: 174	There are a new set of heads that we have just designed. They will be production by the end of July. True mopar wedge they flow equal or better than the predator head with much better velocity. They will be available thru Best Machine Racing 248 987 6038.

Re: How high do you spin your 4.15 or 4.25 RB stroker? [Re: BradH] #1819285 05/05/15 12:45 PM 05/05/15 12:45 PM
Joined: Jan 2003 Posts: 19,363 Las Vegas Al_Alguire I Live Here
Al_Alguire I Live Here Joined: Jan 2003 Posts: 19,363 Las Vegas	So is the block Indy 4.84BS??? "I am not ashamed to confess I am ignorant of what I do not know." "It's never wrong to do the right thing"

Re: How high do you spin your 4.15 or 4.25 RB stroker? [Re: Al_Alguire] #1819287 05/05/15 12:48 PM 05/05/15 12:48 PM
Joined: Jan 2013 Posts: 174 H hustlin hoosier member
hustlin hoosier member H Joined: Jan 2013 Posts: 174	Yes is 4.84 wide flange Indy block. The only way to go.

Re: How high do you spin your 4.15 or 4.25 RB stroker? [Re: BradH] #1819325 05/05/15 01:58 PM 05/05/15 01:58 PM
Joined: Jan 2005 Posts: 866 Winnipeg ,Mb. CA. chryco super stock
chryco super stock Joined: Jan 2005 Posts: 866 Winnipeg ,Mb. CA.	Not to hijack the thread ...... Question re shift points. My combo E.T.s best when I shift into second at around 5200 (near peak torque) If I raise the shift point the car slows a couple of tenths. The engine dyno`d at peak RPM / HP @ 6900 and is a 557" RBRE Hemi . Running 14.5/32/15`s , `Glide , 4.10 Dana , 5400 stall Neil Chance conv. Anyone? chryco Again not trying to hijack the thread Gas is fer washin' parts ....Alky`s fer drinkin' ...Nitro`s fer Racin'!

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