|
Re: 4" Stroke Small block
[Re: SCDaytona]
#1517979
10/16/13 03:50 AM
10/16/13 03:50 AM
|
Joined: Mar 2008
Posts: 883
Affton MO
qwkmopardan
super stock
|
super stock
Joined: Mar 2008
Posts: 883
Affton MO
|
My Demon has a 1973 360 block with no fill, w/ Program 2-Bolt Center 3 main caps and a 4.100 Crankshaft, 13 to 1 CR, Nicely ported production heads and a fairly mild solid flat tappet cam [Racer Brown STX22]. The car weighs almost 3100lbs and has been 1.260 60ft, 6.09 1/8th at 111mph and 9.68 at 136mph 1/4 mile. Car has a crank trigger and timing set at 28*. This engine has 1800+ passes and counting. Crank has not been out of block nor have heads been un-bolted from the block since they were torqued on in winter of 2006. Rod bearings and valve springs have been changed twice. Rod bearings only changed when replacing the $800 Stefs aluminum oil pans, [two of them], after smashing them up on unexpected huge wheelies. I say build what you have and don't kill it with too much timing. 
Last edited by qwkmopardan; 10/16/13 03:55 AM.
|
|
|
Re: 4" Stroke Small block
[Re: 440W8 Duster]
#1517981
10/16/13 09:33 AM
10/16/13 09:33 AM
|
Joined: Dec 2006
Posts: 487
Charleston, SC
SCDaytona
OP
mopar
|
OP
mopar
Joined: Dec 2006
Posts: 487
Charleston, SC
|
Quote:
Quote:
Thanks for all the responses. Some say yes and some say no. I know a couple racers at my track have ran the 3.79 crank for years with good luck with stock blocks, but they are not available any more unless you buy the top end cranks. Our plan was to put the pro gram billet caps on, 1/2 fill, 13-1 compression and roller cam around 650 to 700 lift. My only concern was with the 4" arm, the increased torque made on the block could be an issue long term.
Tom Molnar has that crank available.
Do you have a contact for him? Not sure who he is.
|
|
|
Re: 4" Stroke Small block
[Re: Crizila]
#1517984
10/16/13 11:34 AM
10/16/13 11:34 AM
|
Joined: Aug 2007
Posts: 2,224
Arlington, Tx.
BJS racing
top fuel
|
top fuel
Joined: Aug 2007
Posts: 2,224
Arlington, Tx.
|
Quote:
Quote:
I'm trying to help a buddy of mine who wants to put together a 4" stroker with a 340 stock block. Plans are to put in 4 bolt mains and 1/2 fill the block. Probably 0.030 over as well. This will be using W2 heads. Is this block going to hold up or not? Trying to keep this on budget and an R block is not in his budget.
I'm doing it. No dyno #'s on the motor, but based on car weight, speed, ET, I'm guessing around 650HP. 360 stock block, 1/2 filled, 4 blt. Milodon caps. Motor in a blown application.
And from what different engine builders have told me that is pretty much the cap on hp on a factory block and it actually live for very long. I am just going off of what I have learned and heard.
Back in the swing of things at Painless again! Great to be back!
|
|
|
Re: 4" Stroke Small block
[Re: BJS racing]
#1517985
10/16/13 12:26 PM
10/16/13 12:26 PM
|
Joined: Jan 2003
Posts: 32,394
Quicktree
I Win
|
I Win
Joined: Jan 2003
Posts: 32,394
|
Quote:
Quote:
Quote:
I'm trying to help a buddy of mine who wants to put together a 4" stroker with a 340 stock block. Plans are to put in 4 bolt mains and 1/2 fill the block. Probably 0.030 over as well. This will be using W2 heads. Is this block going to hold up or not? Trying to keep this on budget and an R block is not in his budget.
I'm doing it. No dyno #'s on the motor, but based on car weight, speed, ET, I'm guessing around 650HP. 360 stock block, 1/2 filled, 4 blt. Milodon caps. Motor in a blown application.
And from what different engine builders have told me that is pretty much the cap on hp on a factory block and it actually live for very long. I am just going off of what I have learned and heard.
same here, and I don't have the money to test it and find out. if you can't build it right the first time you probably don't have the bucks to di it again.
|
|
|
Re: 4" Stroke Small block
[Re: qwkmopardan]
#1517991
10/16/13 05:33 PM
10/16/13 05:33 PM
|
Joined: Jan 2003
Posts: 32,394
Quicktree
I Win
|
I Win
Joined: Jan 2003
Posts: 32,394
|
Quote:
This thread about if you can use a stock block and have success with a 4" crank and w-2 heads.
I have a bunch of high HP engines with stock 340/early 360 blocks, [basicly the same as a 340 casting], in service at this time. I have done them with the 4 bolt caps and my opinion it only adds to the cost of the finished project. Same with roller cams, No more power just a lot more money. In fact a couple times I have removed roller cams from customer engines and installed flat tappet cams and car has gone faster. Roller lifters fail and have ruined many a good bottom end. The only block failures I have experienced were due to other parts failing first.
no roller cams because no horse power gain 
|
|
|
Re: 4" Stroke Small block
[Re: BJS racing]
#1517994
10/16/13 06:33 PM
10/16/13 06:33 PM
|
Joined: Aug 2003
Posts: 11,179
Atco NJ
DJVCuda
I Live Here
|
I Live Here
Joined: Aug 2003
Posts: 11,179
Atco NJ
|
Quote:
Quote:
just curious to why your going with the 3.79 vs the 4.00 stroke. seems like more cubes the better. what are the benefits of the shorter stroke?
A shorter stroke engine it is easier and quicker to go up in the RPM's. Typically with a shorter stroke engine you can turn more RPM than with the longer stroke due to the rotating weight and centrifical forces that are increased as your stroke gets longer.
My 4.125 stroke small block was 1749 grams and revs like a dirt bike.
Makes killer torque without the rpm of the shorter stroke.
With eddy heads making 630 horse and averaging over 500 ft-lbs through the pull is not a bad thing while keeping things alive with a peak around 6500
|
|
|
Re: 4" Stroke Small block
[Re: BJS racing]
#1517995
10/16/13 06:43 PM
10/16/13 06:43 PM
|
Joined: Oct 2003
Posts: 11,684
W. Kentucky
justinp61
I Live Here
|
I Live Here
Joined: Oct 2003
Posts: 11,684
W. Kentucky
|
Quote:
Quote:
Quote:
Quote:
just curious to why your going with the 3.79 vs the 4.00 stroke. seems like more cubes the better. what are the benefits of the shorter stroke?
A shorter stroke engine it is easier and quicker to go up in the RPM's. Typically with a shorter stroke engine you can turn more RPM than with the longer stroke due to the rotating weight and centrifical forces that are increased as your stroke gets longer.
Then why stroke it at all?
Why not shorten up the stroke? I have seen a few cranks under 3 inch stroke for the SB, those motors must have been real fast
BTW A shorter stroke tends to end up with heavier reciprocating parts, ever compare 340 and 360 pistons? 
Measure the bore difference and then ask again. Yes the 340 piston is heavier because it is a bigger bore. Go find some 318/340 stock rods and weight them against a 360 stock rod. Then just for kicks weigh them all against a 273 rod. The 360 rod is the heaviest out of them all. 318/340 use the same rods. Why is that? Not trying to start any kind of anyone is wrong kinda deal. Just going with like I said earlier what I know and what I've been told.
I don't know many that put stock rods in a stroker making much steam . I didn't even use them in my 340 build years ago.
|
|
|
Re: 4" Stroke Small block
[Re: DJVCuda]
#1517996
10/16/13 06:50 PM
10/16/13 06:50 PM
|
Joined: Apr 2010
Posts: 1,049
ohio
all spooled up
super stock
|
super stock
Joined: Apr 2010
Posts: 1,049
ohio
|
Quote:
Quote:
Quote:
just curious to why your going with the 3.79 vs the 4.00 stroke. seems like more cubes the better. what are the benefits of the shorter stroke?
A shorter stroke engine it is easier and quicker to go up in the RPM's. Typically with a shorter stroke engine you can turn more RPM than with the longer stroke due to the rotating weight and centrifical forces that are increased as your stroke gets longer.
that engine is sweet  if you have it in a car what does it run
My 4.125 stroke small block was 1749 grams and revs like a dirt bike.
Makes killer torque without the rpm of the shorter stroke.
With eddy heads making 630 horse and averaging over 500 ft-lbs through the pull is not a bad thing while keeping things alive with a peak around 6500
|
|
|
|
|
