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#2403408 - 11/14/17 02:58 AM Re: 4.125/ 4.250" stroke stock block SB combos [Re: mshred]
qwkmopardan Offline
super stock

Registered: 03/26/08
Posts: 788
Loc: Affton MO
I have a couple in use. First one in my 72 Demon is a 13to1 CR 418/360. 4.03 x 4.100. Bottom end has 2600 passes on it and pistons have never been removed from block since new. Just broke a valve a month back on a friday night. Stayed up late and put a different set of heads on and raced it on saturday night and sunday, same weekend. Won a race with it on sunday. Production heads, 1973 587 "smog" castings, 73 block with no fill, Flat tappet cam, racer brown STX-22. Car weighs 3050#. Been 9.68 at 136mph--1/4 mile and 6.09 at 111 1/8th mile-- 1.26 60ft. I put 30 more passes on it this weekend at Memphis Int. raceway and made it to a final in S/P, 9 rounds. Still went 6.28 at 107.6 after 2600 passes,with lesser ported heads.

Other one is 4.25 x 4.07. 442 c.i. Same 587 production "smog" heads. STX-21 Racer brown flat tappet cam. 11.5to1 CR. 11.20s at 118mph 1/4 mile and 7.20s at 97mph 1/8th mile--1.52 60ft. In a 4200# 79 Chrysler "300". Has 3" exh all the way to the rear bumper with 4 mufflers. Runs on 80% 93 octane mixed with 20% 110 race gas. Made the 1100 mile dragweek trip a couple years ago with no issues.

Both engines have produced best E.T.s with 28* fixed timing. The 79 "300" got around 14mpg on highway during dragweek, when I bought this car in 1987 it only got 12/13 mpg on a vacation to colorado, still 100% stock. Engine in "300" is shifted at 6400rpm. Engine in Demon shifted at 7000 after the first couple months, first couple months I shifted it at 7800rpm. Actually was a couple hundredths quicker at 7800 but I figured longevity was worth more than a couple hundredths. Getting close to $100,000 in winnings with engine in the Demon, $12000 was from wheelie contests. Youtube--dodge demon wheelie 2.


Actually have a third one that is 4.04 x 4.00. Same 587 smog heads. ST-21 Racer brown flat tappet. 93 octane pump gas. 4300# 1990 Ram D150 short bed. 2 3" muffs an X pipe and one stock appearing tailpipe. Muff without tailpipe had an electric cut out at exit. with cut-out shut, the X-pipe worked like a y-pipe and made a single exhaust. Went 12.20s single and 11.80s dual exh until the 727 grenaded and killed the truck and broke 5 bones in my foot. I still have engine but truck is gone. Waiting for the magnum 318 to blow up so I can turn my replacement 92 D150 into a hotrod. Will probably run forever. OK then, when the AC quits blowing cold, maybe then I will put the 410 in, of course with a billet high gear drum in the 727.


Edited by qwkmopardan (11/14/17 03:36 AM)

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#2403436 - 11/14/17 08:33 AM Re: 4.125/ 4.250" stroke stock block SB combos [Re: Rob C]
LaRoy Engines Offline
mopar

Registered: 10/17/11
Posts: 499
Loc: Idaho
Originally Posted By Rob C
La Roy engines, what did you do for a cam?


I spec'd a custom solid roller for it.

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#2403580 - 11/14/17 02:13 PM Re: 4.125/ 4.250" stroke stock block SB combos [Re: mshred]
69 lawndart Offline
member

Registered: 03/28/13
Posts: 89
Loc: Kansas, Topeka
I have two BPE 4.250" cranks the first one is 468cid 4.250" x 4.185" R3, 59deg, W9 deal. Very fun to drive and it get about 15-16 mpg and all kinds of torque and it doesn't beat the valve train up. I put it together in 2014 for DW and the first pass on the motor it went 10.11 @135 through the exhaust on a concretive tune up in a 69 Dart. That motor is in the Cuda now. The second motor is still in the works short block is done, 4.250" x 4.200" R3 48deg deal, 6.320" carillo rods nice light pistons thin rings.

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#2403745 - 11/14/17 07:55 PM Re: 4.125/ 4.250" stroke stock block SB combos [Re: mshred]
mshred Offline
master

Registered: 04/08/09
Posts: 3336
Loc: Toronto
I had never thought about offset grinding my current crank, that is another option I wasn't considering before.

Fuel mileage doesn't matter to me, I will use my daily when miles per gallon is the concern over smiles per gallon lol

Reading some of these posts really makes me wish I could find an r3 for a good price, but I am stuck with the stock block for now, which means smaller bore sizes I.e. 4.030- 4.060.... cool to see what some of these aftermarket block combos can do, but also nice to see guys out there using these larger cranks in the stock blocks.

Doing some test fitment and clearancing is nothing I don't mind doing. I don't run a windage tray, so that's not something I am too concerned about.

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#2403760 - 11/14/17 08:19 PM Re: 4.125/ 4.250" stroke stock block SB combos [Re: mshred]
D-50 Offline
pro stock

Registered: 10/04/09
Posts: 1222
Loc: North, Alabama
I would probably go with a bigger stroke. But I am happy with my 3.79 stroke small block. It is a 1973 340 block that is not filled or has a girdle. I am running the 360-2 heads like you have but mine were ported by Brett Miller. It is only 10.9 comp. and a roller (255/266 a.050) I have never ran anything but pump gas. It made peak hp at 7300 but I only shift at 6800. It would probably run faster if I shifted at a higher RPM and it didn't have my home made headers on it. I have never built headers before.
_________________________
1.33 60 ft,6.21 at 110.59, pump gas small block,2950lbs,drag radials,mufflers and driven to track ...

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#2403790 - 11/14/17 09:22 PM Re: 4.125/ 4.250" stroke stock block SB combos [Re: mshred]
one bad fish Offline
super stock

Registered: 07/11/08
Posts: 1178
Loc: bronx n.y
Very good topic of interesting
_________________________

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#2403907 - 11/15/17 09:13 AM Re: 4.125/ 4.250" stroke stock block SB combos [Re: mshred]
Rob C Offline
mopar

Registered: 03/04/05
Posts: 686
Loc: Earth
Indeed an interesting topic. It’s cool to see who is doing what and what there doing it with.

Mshred, I can only find short deck race blocks. Mostly the 9.2 and mostly a 50mm cam tunnel.
I’d love a standard height & tappet block myself.

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#2403911 - 11/15/17 09:20 AM Re: 4.125/ 4.250" stroke stock block SB combos [Re: qwkmopardan]
mopar dave Offline
master

Registered: 01/04/07
Posts: 5234
Loc: flint michigan
Very respectable small blocks. Makes me want to do another one.

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#2404316 - 11/15/17 09:29 PM Re: 4.125/ 4.250" stroke stock block SB combos [Re: Rob C]
mshred Offline
master

Registered: 04/08/09
Posts: 3336
Loc: Toronto
Originally Posted By Rob C
Indeed an interesting topic. It’s cool to see who is doing what and what there doing it with.

Mshred, I can only find short deck race blocks. Mostly the 9.2 and mostly a 50mm cam tunnel.
I’d love a standard height & tappet block myself.


I have been looking for a while myself and have been finding the same thing, mostly short deck stuff....hoping my poor mans race block with half fill can hold up to whatever I throw at it for as long as possible.

So far so good, fingers crossed

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#2404374 - 11/16/17 12:29 AM Re: 4.125/ 4.250" stroke stock block SB combos [Re: mshred]
Rob C Offline
mopar

Registered: 03/04/05
Posts: 686
Loc: Earth
I’d do a short deck but an intake is impossible to find. I’m not interested in building my own sheet metal intake or the 50mm cam expense. It’s a bit much dollar wise at this point. I just can’t throw money at like the U.S. government does its problems. (Real or Perceived!)

LMAO

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#2404429 - 11/16/17 08:24 AM Re: 4.125/ 4.250" stroke stock block SB combos [Re: qwkmopardan]
mopar dave Offline
master

Registered: 01/04/07
Posts: 5234
Loc: flint michigan
Any idea what contributed to the low timing at 28* locked? Im thinking those smog heads must have a fast burn chamber for one. Curious to know.

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#2404442 - 11/16/17 09:22 AM Re: 4.125/ 4.250" stroke stock block SB combos [Re: Rob C]
340Cuda Offline
top fuel

Registered: 04/04/03
Posts: 1606
Loc: Tulsa, Oklahoma
Originally Posted By Rob C
I’d do a short deck but an intake is impossible to find.
LMAO

These actually come up on e-Bay more often than one would think.

Bill

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