Re: 4.125/ 4.250" stroke stock block SB combos
[Re: mshred]
#2401752
11/11/17 03:29 AM
11/11/17 03:29 AM
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Joined: Jan 2003
Posts: 11,728 Portage,michigan
B3422W5
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I Live Here
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Portage,michigan
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Cant see much use for them personally. To me, probably about the best combo is a big bore with a 3.79ish stroke. Dont see many if any guys running W8/9 stuff with more than a 4 inch stroke. And most of the other heads are too small to need bigger than a 4 inch arm( if that even)
69 Dart GTS A4 Silver All steel, flat factory hood, 3360race weight 418 BPE factory replacement headed stroker, 565 lift solid cam Best so far, low 10.30’s 1/4 1.41 best 60 foot 6.56 at 104.17
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Re: 4.125/ 4.250" stroke stock block SB combos
[Re: mshred]
#2401793
11/11/17 11:03 AM
11/11/17 11:03 AM
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Joined: Jan 2003
Posts: 4,448 Phoenix, AZ
MoparBilly
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master
Joined: Jan 2003
Posts: 4,448
Phoenix, AZ
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Street Combo or Race only???
The 4.125 arm from Bloomer has 2.00 journals and uses the 6.200 chevy rod with a .927 pin, so it fits in the block much better than the 4 inch kits with the stock size rods.
"Livin' in a powder keg and givin' off sparks"
4 Street cars, 5 Race engines
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Re: 4.125/ 4.250" stroke stock block SB combos
[Re: B3422W5]
#2401803
11/11/17 11:21 AM
11/11/17 11:21 AM
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Joined: Feb 2005
Posts: 20,201 PA.
pittsburghracer
"Little"John
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"Little"John
Joined: Feb 2005
Posts: 20,201
PA.
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Cant see much use for them personally. To me, probably about the best combo is a big bore with a 3.79ish stroke. Dont see many if any guys running W8/9 stuff with more than a 4 inch stroke. And most of the other heads are too small to need bigger than a 4 inch arm( if that even) These guys wind the heck out of their engines to get the power out of them. I will be researching this shortly myself for my 360-1 heads or if I strike gold possibly a set of Edelbrock Victors. This is my bracket piece so I refuse to beat on it to bad.
1970 Duster Edelbrock headed 408 5.984@112.52 422 Indy headed small block 5.982@112.56 mph 9.42@138.27
Livin and lovin life one day at a time
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Re: 4.125/ 4.250" stroke stock block SB combos
[Re: mopar dave]
#2402020
11/11/17 06:05 PM
11/11/17 06:05 PM
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Joined: Jan 2003
Posts: 4,448 Phoenix, AZ
MoparBilly
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master
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Phoenix, AZ
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I agree with Don. I have seen alot of fast combos using that 3.79 stroke. If i were to do another sb project some what budget build like i do, i would search out a good x block and use the 3.79 crank with w9' s or edel victors. Gm and mopar used a 3 3/4 stroke in a few motors, must be some thing good about it . Exactly what I had. Replaced the 3.79 crank and 12.5 pistons with a 4.125 crank and dish pistons. More power, and runs on pump gas, so I'll never go back. Listed the 3.79 crank on here for 300 bucks, no takers.
"Livin' in a powder keg and givin' off sparks"
4 Street cars, 5 Race engines
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Re: 4.125/ 4.250" stroke stock block SB combos
[Re: MoparBilly]
#2402246
11/11/17 11:36 PM
11/11/17 11:36 PM
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Joined: Sep 2014
Posts: 4,457 Washington
madscientist
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master
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Posts: 4,457
Washington
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I agree with Don. I have seen alot of fast combos using that 3.79 stroke. If i were to do another sb project some what budget build like i do, i would search out a good x block and use the 3.79 crank with w9' s or edel victors. Gm and mopar used a 3 3/4 stroke in a few motors, must be some thing good about it . Exactly what I had. Replaced the 3.79 crank and 12.5 pistons with a 4.125 crank and dish pistons. More power, and runs on pump gas, so I'll never go back. Listed the 3.79 crank on here for 300 bucks, no takers. PM sent.
Just because you think it won't make it true. Horsepower is KING. To dispute this is stupid. C. Alston
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Re: 4.125/ 4.250" stroke stock block SB combos
[Re: mshred]
#2402282
11/12/17 12:35 AM
11/12/17 12:35 AM
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Joined: Jan 2005
Posts: 12,424 Kalispell Mt.
HotRodDave
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Kalispell Mt.
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4.25 stroke SBs are awesome. All the crap about the heads not being big enough out there is bull pucky. An x head flows almost what a 906 BB head does and tons of guys are running them on 440 CID engines. A decent ported eddy SB head flows about what a ported 906 does and again lots of 440s run great with 906s. A good W2 flows similar to a decent eddy BB head and again tons of guys running them on 440-512 CID engines.
The real question should be how many cubes X RPM do you want to turn. I always build the biggest bottem end the budget can aford, nothing like loafing along at low RPM and still posting great time slips.
I am not causing global warming, I am just trying to hold off a impending Ice Age!
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Re: 4.125/ 4.250" stroke stock block SB combos
[Re: HotRodDave]
#2402288
11/12/17 12:43 AM
11/12/17 12:43 AM
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Joined: Jan 2003
Posts: 11,728 Portage,michigan
B3422W5
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I Live Here
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Portage,michigan
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4.25 stroke SBs are awesome. All the crap about the heads not being big enough out there is bull pucky. An x head flows almost what a 906 BB head does and tons of guys are running them on 440 CID engines. A decent ported eddy SB head flows about what a ported 906 does and again lots of 440s run great with 906s. A good W2 flows similar to a decent eddy BB head and again tons of guys running them on 440-512 CID engines.
The real question should be how many cubes X RPM do you want to turn. I always build the biggest bottem end the budget can aford, nothing like loafing along at low RPM and still posting great time slips. Yeah. And guess what stroke those 440's with smallish heads that run good are using..... 3.75. Nothing wrong with those huge strokes i guess. But on a dinky bore and will all the side loading and terrible rod ratios.... why? Especially for a race only motor. Are guys running them and naking power, sure. Just to me, that 3.80 ish stroke and a big bore seems optimal.
69 Dart GTS A4 Silver All steel, flat factory hood, 3360race weight 418 BPE factory replacement headed stroker, 565 lift solid cam Best so far, low 10.30’s 1/4 1.41 best 60 foot 6.56 at 104.17
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Re: 4.125/ 4.250" stroke stock block SB combos
[Re: B3422W5]
#2402290
11/12/17 12:47 AM
11/12/17 12:47 AM
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Joined: Feb 2005
Posts: 20,201 PA.
pittsburghracer
"Little"John
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"Little"John
Joined: Feb 2005
Posts: 20,201
PA.
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Comparing apple to apples I’m gonna say about .20 difference between we shall say a 408 and a stock stroke 360.
1970 Duster Edelbrock headed 408 5.984@112.52 422 Indy headed small block 5.982@112.56 mph 9.42@138.27
Livin and lovin life one day at a time
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Re: 4.125/ 4.250" stroke stock block SB combos
[Re: pittsburghracer]
#2402303
11/12/17 01:05 AM
11/12/17 01:05 AM
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Joined: Jan 2003
Posts: 11,728 Portage,michigan
B3422W5
I Live Here
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I Live Here
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Portage,michigan
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Comparing apple to apples I’m gonna say about .20 difference between we shall say a 408 and a stock stroke 360. Years ago when Hensley built my first stroker( 416) i asked Ken Hensley( who i have a ton of respect for) what difference there was between a 340 and a 416 all other things being the same. He said 3 tenths. Never forgot him saying that. Real world, my 360 has run 11.20's at 10.4 compression with mild eddies at 3300 with a 727. My little brother has a new 416 with max effort Shady Dell eddies, 12+ compression, same weight, and he has a 904. Admittedly he is having teething issues with it, but thus far he has been 10.95 at 120. 1.5 mph faster and 3 tenths quicker, and he has a 904, which is definately quicker. I am sure it will run a good bit better, but so would mine with a 904 i have on the shelf and a convertor correctly specced( one in car car now is a tight 4500 flash) devinately "off" with what i have. So yea John, i agree. Why toss that huge crank around for not much gain. 4 inch to me is more than plenty.
69 Dart GTS A4 Silver All steel, flat factory hood, 3360race weight 418 BPE factory replacement headed stroker, 565 lift solid cam Best so far, low 10.30’s 1/4 1.41 best 60 foot 6.56 at 104.17
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Re: 4.125/ 4.250" stroke stock block SB combos
[Re: mopar dave]
#2402327
11/12/17 02:03 AM
11/12/17 02:03 AM
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Joined: Feb 2005
Posts: 20,201 PA.
pittsburghracer
"Little"John
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"Little"John
Joined: Feb 2005
Posts: 20,201
PA.
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I have a 4.100 bore 48 degree R block sitting here with a 3.79 billet crank, roller cam and lifters, two sets of pistons, a set of Arrow rods, a W7 intake, and Jessel rockers for W7 heads. The deal was to good to pass up so some day I may see what this combo will run. I think it would be an interesting project
Last edited by pittsburghracer; 11/12/17 02:04 AM.
1970 Duster Edelbrock headed 408 5.984@112.52 422 Indy headed small block 5.982@112.56 mph 9.42@138.27
Livin and lovin life one day at a time
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