Re: SB 3.79" or 4.00" crank?
[Re: SpareParts]
#1798796
04/08/15 08:11 PM
04/08/15 08:11 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 have been pleased so far with my 3.79 stroke crank in a stock 340 block. Ran a new best last weekend even though I have lost over a 1/2 tenth in the 60 ft. for some reason and it is sputtering around the mph lights.
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: SB 3.79" or 4.00" crank?
[Re: justinp61]
#1799033
04/09/15 12:44 AM
04/09/15 12:44 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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I'm 3260# with a 4.10 gear and figured the 4" stroke might be a little help. I've got both and I am big on revs but my junk is light and in my street rod its a 4" for the added torque.. that torque is nice and it still revs decent... I take it to 7500 rpm... the 3.79 goes way higher but if you stay with 4.10 gears you will never reach the high revs... I use 4.56 gears in the smaller engine and 4.10 on the 416 engine
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Re: SB 3.79" or 4.00" crank?
[Re: MR_P_BODY]
#1799272
04/09/15 11:44 AM
04/09/15 11:44 AM
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Joined: Jan 2003
Posts: 9,892 Weddington, N.C.
Streetwize
master
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master
Joined: Jan 2003
Posts: 9,892
Weddington, N.C.
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3.79" can make as much or more power by trading RPM for torque, great for lighter combos and/or tigher gears. The problem with the 4" is only on the top because it's tough/expensive to get enough Head flow. A 4" (generally) will ET an automatic car quicker all else being equal though, plus it's so well proven and sorted out, it's tough to make a rational argument against just going for cubes. 3.79" even with a longer 6.200 or so rod still winds up with a fairly heavy piston due the tall 9.58-ish deck height. 9.200 deck blocks are a natural for the 3.79 though
Last edited by Streetwize; 04/09/15 11:46 AM.
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