Yet another gen 3 hemi question- I have two options-
#1659377
08/15/14 04:35 PM
08/15/14 04:35 PM
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Joined: Jan 2012
Posts: 1,541
USA
hudsonhornet7x
OP
pro stock
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OP
pro stock
Joined: Jan 2012
Posts: 1,541
USA
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Okay, hate to start another gen 3 thread but I kind of fell into a couple deals and do not know which way to go. Deal # 1 Brand new 6.1 Short Block at a buddy's house that he wants to sell. Deal # 2 Brand new 6.4 Short Block that was ordered and never picked up. I can get a great deal on either one, but given these two short blocks, which one would you go with? I want to build a N/A motor for a 68 b body. Carb'd, 11:1 compression, basically a hot street motor built the old way with a gen 3 foundation. I understand they both have forged cranks, but the rods and pistons will probably be switched out for forged items. Which one would you pick and why? Which block is stronger? Please bear in mind that I will be getting a good price on either so I can use some of that money for better internals. Thanks Moparts!! 
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Re: Yet another gen 3 hemi question- I have two options-
[Re: hudsonhornet7x]
#1659378
08/15/14 04:41 PM
08/15/14 04:41 PM
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Joined: May 2005
Posts: 723
Houston Tx
Uhcoog1
super stock
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super stock
Joined: May 2005
Posts: 723
Houston Tx
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Quote:
Okay, hate to start another gen 3 thread but I kind of fell into a couple deals and do not know which way to go.
Deal # 1 Brand new 6.1 Short Block at a buddy's house that he wants to sell.
Deal # 2 Brand new 6.4 Short Block that was ordered and never picked up.
I can get a great deal on either one, but given these two short blocks, which one would you go with?
I want to build a N/A motor for a 68 b body. Carb'd, 11:1 compression, basically a hot street motor built the old way with a gen 3 foundation.
I understand they both have forged cranks, but the rods and pistons will probably be switched out for forged items.
Which one would you pick and why?
Which block is stronger? Please bear in mind that I will be getting a good price on either so I can use some of that money for better internals.
Thanks Moparts!!
If price is comparable the choice is easy. Get the 6.1. Timing chain set is better for hot-rodding, camshafts are cheaper, etc.
IMO, you ONLY want the 6.4 if you want to keep it mostly stock and run it with a factory computer. Obviously Steff is a rock star and designed a belt drive to get around the shortcomings, but for the common man the 6.1 is easier to work with.
Put a set of eagle or apache heads and go play. If you want to go with forged internals, lots of good options. Wiseco has always treated me well with wiseco pistons and K1 rods and get the nod in my book.
-'02 Dodge Viper Ex-World Challenge racecar
-'73 Duster, 6.1 based 392 hilborn hemi, tko600, full floater rear 9", Hellwig custom bars, viper brakes, built for road course
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Re: Yet another gen 3 hemi question- I have two options-
[Re: hudsonhornet7x]
#1659382
08/15/14 05:17 PM
08/15/14 05:17 PM
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Joined: Jun 2003
Posts: 9,225
Charleston
sixpackgut
Drag Week Mod Champion
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Drag Week Mod Champion
Joined: Jun 2003
Posts: 9,225
Charleston
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I posted sonic numbers on my 6.1 in some thread a while ago.
I would get both today, and sell the one after you decide for sure
Gen 3 power 6.22@110, 9.85@135
Follow @g3hemiswap on instagram
performance only racing, CRT, ultimate converter, superior design concepts, ThumperCarbs
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Re: Yet another gen 3 hemi question- I have two options-
[Re: hudsonhornet7x]
#1659383
08/15/14 05:20 PM
08/15/14 05:20 PM
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Joined: May 2005
Posts: 723
Houston Tx
Uhcoog1
super stock
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super stock
Joined: May 2005
Posts: 723
Houston Tx
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Quote:
Thanks, I heard there was a company coming out with an adapter? that will allow older gen 3 cams into a 6.4. I do not know the name of the company.
I have also heard that 6.1 blocks are the thinnest, then I hear the opposite. Does anyone have the real story?
At what point does a 6.1 break?
6.1 cylinder walls are thinner than an 03-08 5.7. That is true. Don't know how thick a 6.4 cylinder wall is.
FlyByU went 8.91 @ 152 on two stages of nitrous (400/200) in his LX charger with a 426 stroker kit (6.1 block). I don't know his race weight, but it was probably close to or upwards of 4,000 lb. He did crack a block on the dyno with that tune up I believe.
Rule of thumb is 1800 hp with a stock stroke and billet main caps. Less with more stroke. Below 1000-1200 hp, no need for billet caps.
If you're contemplating more, then get an aluminum 6.1 block.
-'02 Dodge Viper Ex-World Challenge racecar
-'73 Duster, 6.1 based 392 hilborn hemi, tko600, full floater rear 9", Hellwig custom bars, viper brakes, built for road course
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Re: Yet another gen 3 hemi question- I have two options-
[Re: hudsonhornet7x]
#1659384
08/15/14 05:25 PM
08/15/14 05:25 PM
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Joined: Jun 2003
Posts: 9,225
Charleston
sixpackgut
Drag Week Mod Champion
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Drag Week Mod Champion
Joined: Jun 2003
Posts: 9,225
Charleston
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Quote:
I would say. I would like to make 600 and have a Durable Engine.
It seems like every other post on gen 3's has conflicting answers. The car will weigh approx 3,600 with me in it, and I want a powerful engine that I don't have to sit at night worrying about the bottom end or potential cracks.
How about billet main caps, will they help me much or are they overkill?
When i say my hemi was junk that i took to drag week last year, i mean it was really junk. The pistons were missing chunks out of the skirts. It rattled and vibrated. Aluminum was stuck to the cylinder walls and the bearings almost shot. It made the journey and since having all that fixed, it is so smooth and sweet. If it didnt break on that 1500 mile trip then i have no worries now
Gen 3 power 6.22@110, 9.85@135
Follow @g3hemiswap on instagram
performance only racing, CRT, ultimate converter, superior design concepts, ThumperCarbs
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Re: Yet another gen 3 hemi question- I have two options-
[Re: sixpackgut]
#1659385
08/15/14 06:48 PM
08/15/14 06:48 PM
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Joined: Feb 2011
Posts: 4,302
Nebraska
72Swinger
master
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master
Joined: Feb 2011
Posts: 4,302
Nebraska
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You will never find the limit of either in N/A form.
Mopar to the bone!!!
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