Thoughts on 372" sb requested.
#1729588
01/14/15 05:55 AM
01/14/15 05:55 AM
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Joined: Feb 2007
Posts: 72
San Angelo, Texas
Cevidicus
OP
member
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OP
member
Joined: Feb 2007
Posts: 72
San Angelo, Texas
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A friend has this 372" small block that's built and ready to go. I just want to get some thoughts on its power potential and what could be expected from it in say a 3400lbs a body. All thoughts and criticisms welcome. I just want to know what y'all think its capable of. Thanks!
372"
340 block .030 over,
360 cast crank with mains turned down to fit,
eagle rods,
KB hyperutectic pistons,12.5:1,
W2 heads ported and flowed 290,
Mopar 1.5 roller rockers,
Howards solid .599/.620 solid cam,
Holley strip Dom intake
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Re: Thoughts on 372" sb requested.
[Re: Cevidicus]
#1729589
01/14/15 11:04 AM
01/14/15 11:04 AM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
A friend has this 372" small block that's built and ready to go. I just want to get some thoughts on its power potential and what could be expected from it in say a 3400lbs a body. All thoughts and criticisms welcome. I just want to know what y'all think its capable of. Thanks!
372"
340 block .030 over,
360 cast crank with mains turned down to fit,
eagle rods,
KB hyperutectic pistons,12.5:1,
W2 heads ported and flowed 290,
Mopar 1.5 roller rockers,
Howards solid .599/.620 solid cam,
Holley strip Dom intake
That would be about 520hp... JMO
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Re: Thoughts on 372" sb requested.
[Re: MR_P_BODY]
#1729590
01/14/15 11:36 AM
01/14/15 11:36 AM
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Joined: Oct 2007
Posts: 3,978
Hilltown Pa
1967dartgt
master
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master
Joined: Oct 2007
Posts: 3,978
Hilltown Pa
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Haven't seen good luck with 360 cranks in 340s. Should be a stout motor, high tens if you max the combo.
Brett Miller W9 cnc'd heads
STR Chassis fabraction
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Re: Thoughts on 372" sb requested.
[Re: 1967dartgt]
#1729592
01/14/15 11:44 AM
01/14/15 11:44 AM
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Joined: Dec 2009
Posts: 20,640
in a cattle trailer down by th...
Guitar Jones
Paddle faster! I hear banjo music!
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Paddle faster! I hear banjo music!
Joined: Dec 2009
Posts: 20,640
in a cattle trailer down by th...
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Quote:
Haven't seen good luck with 360 cranks in 340s. Should be a stout motor, high tens if you max the combo.
I agree on the 10's. I don't know about the crank but I'd think if you kept the RPM's under 7000 it would probably hold up.
"Follow me the wise man said, but he walked behind"
'92 D250 Club Cab CTD, 47RH conversion, pump tweaks, injectors, rear disc and hydroboost conversion.
'74 W200 Crew Cab 360, NV4500, D44, D60 and NP205 divorced transfer case. Rear disc and hydroboost coming soon!
2019 1500 Long Horn Crew Cab 4WD, 5.7 Hemi.
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Re: Thoughts on 372" sb requested.
[Re: J_BODY]
#1729593
01/14/15 11:51 AM
01/14/15 11:51 AM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
Cast crank with mains turned down makes me cringe...... but I'll wait for more knowledgeable folks to kick in.
In 73 the 340 had a cast crank... it was just the 1
year then the 340 died
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Re: Thoughts on 372" sb requested.
[Re: MR_P_BODY]
#1729594
01/14/15 12:11 PM
01/14/15 12:11 PM
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Joined: Jan 2003
Posts: 9,826
las vegas
70AARcuda
master
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master
Joined: Jan 2003
Posts: 9,826
las vegas
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MP/Scat sells a 3.58 stroke 340 main cast crank.
Should be in the 10s...
Tony
70 AARCuda Vitamin C
71 Dart Swinger 360 10.318 @ 128.22(10-04-14 Bakersfield)
71 Demon 360 10.666 @122.41 (01-29-17 @ Las Vegas)
71 Duster 408 (10.29 @ 127.86 3/16/19 Las Vegas)
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Re: Thoughts on 372" sb requested.
[Re: 70AARcuda]
#1729598
01/14/15 03:39 PM
01/14/15 03:39 PM
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Joined: Aug 2003
Posts: 3,245
Between a rock & a hard place
cudadoug
master
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master
Joined: Aug 2003
Posts: 3,245
Between a rock & a hard place
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Quote:
MP/Scat sells a 3.58 stroke 340 main cast crank.
Should be in the 10s...
A buddy of mine was going to do this SAME combo. "Poor Man's Stroker"? Well, not so much. GOOD shops were quoting him $500 and up to cut and re heat treat the crank. Bought that MP/SCAT from Jegs for $360-ish.
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Re: Thoughts on 372" sb requested.
[Re: Cevidicus]
#1729599
01/14/15 03:49 PM
01/14/15 03:49 PM
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Joined: Feb 2009
Posts: 1,532
off the grid
340B5
pro stock
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pro stock
Joined: Feb 2009
Posts: 1,532
off the grid
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Get a good crank and use a lot of converter. 10.90's maxed out w/4.86 gear.
Yeah, it's got a smallblock.
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Re: Thoughts on 372" sb requested.
[Re: Cevidicus]
#1729600
01/14/15 08:13 PM
01/14/15 08:13 PM
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Joined: Oct 2006
Posts: 149
N. Of Detroit, Mi
733404spdCuda
member
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member
Joined: Oct 2006
Posts: 149
N. Of Detroit, Mi
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My Combo built by MRL Racing
340 Block 4.100"
3.58 Eagle Crank
2.100 Eagle sbc H Beam rods
Diamond Piston 9.7 comp
Edelbrock 63CC Heads CNC ported my MCH
Houghs 1.6 roller rockers
Solid 243/251 duration @ .050" .550/.570 lift
Edelbrock RPM Intake
Kevco pan with baffles
750 quickfuel carb
520HP @ 6200 and 490TQ @4500 on pump gas
Nice street / strip motor
Last edited by 733404spdCuda; 01/14/15 08:14 PM.
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Re: Thoughts on 372" sb requested.
[Re: cudadoug]
#1729603
01/15/15 05:14 PM
01/15/15 05:14 PM
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Joined: Dec 2005
Posts: 11,562
Fulton County, PA
CMcAllister
Mr. Helpful
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Mr. Helpful
Joined: Dec 2005
Posts: 11,562
Fulton County, PA
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2250# door car. 9.40s, 30s on a good day. 142-143 MPH. 7200-7400 RPM. 360 crank cut with no other work other than balanced.
I fought rod bearing issues for a long time before doing some work on the oil system. Still had to do bearings at 120 runs, but that's about what I put on it in a year. Just freshen it up over the winter and put it back in.
That was a while ago. Wouldn't do it again with the parts that are available now unless it would maybe be a nice street deal with less RPM. Inexpensive cubic inches.
Last edited by CMcAllister; 01/15/15 11:47 PM.
If the results don't match the theory, change the theory.
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