Re: 4.125/ 4.250" stroke stock block SB combos
[Re: mshred]
#2403408
11/14/17 05:58 AM
11/14/17 05:58 AM
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Joined: Mar 2008
Posts: 883 Affton MO
qwkmopardan
super stock
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super stock
Joined: Mar 2008
Posts: 883
Affton MO
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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.
Last edited by qwkmopardan; 11/14/17 06:36 AM.
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Re: 4.125/ 4.250" stroke stock block SB combos
[Re: Rob C]
#2403436
11/14/17 11:33 AM
11/14/17 11:33 AM
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Joined: Oct 2011
Posts: 559 Idaho
LaRoy Engines
mopar
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mopar
Joined: Oct 2011
Posts: 559
Idaho
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La Roy engines, what did you do for a cam? I spec'd a custom solid roller for it.
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Re: 4.125/ 4.250" stroke stock block SB combos
[Re: mshred]
#2403760
11/14/17 11:19 PM
11/14/17 11:19 PM
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Joined: Oct 2009
Posts: 1,267 North, Alabama
D-50
pro stock
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pro stock
Joined: Oct 2009
Posts: 1,267
North, Alabama
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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 in the 1/8, pump gas small block,2950lbs,drag radials,mufflers and driven to track ...
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Re: 4.125/ 4.250" stroke stock block SB combos
[Re: Rob C]
#2404316
11/16/17 12:29 AM
11/16/17 12:29 AM
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Joined: Apr 2009
Posts: 3,415 Toronto
mshred
OP
master
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OP
master
Joined: Apr 2009
Posts: 3,415
Toronto
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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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Re: 4.125/ 4.250" stroke stock block SB combos
[Re: Rob C]
#2404442
11/16/17 12:22 PM
11/16/17 12:22 PM
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Joined: Apr 2003
Posts: 3,514 Tulsa, Oklahoma
340Cuda
master
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master
Joined: Apr 2003
Posts: 3,514
Tulsa, Oklahoma
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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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