Which build (block) is going to live longer 351w:
Moderator: Team
-
- Pro
- Posts: 217
- Joined: Sat Mar 08, 2014 12:35 pm
- Location:
Which build (block) is going to live longer 351w:
Which block, caps, bearings are going to live longer with these builds?
16psi of boost making around 700-800hp max, good tune & factory '69 Windsor block:
351w with a stock stroker kit, 5,500 rpm max
408w stroker, 5,000 rpm max
Forged, neutral balance 408w stroker, 5,500 rpm max
All would be aftermarket stroker kits with aftermarket cranks, 4340 rods, forged pistons & a fully machined block & careful assembly by a pro.
16psi of boost making around 700-800hp max, good tune & factory '69 Windsor block:
351w with a stock stroker kit, 5,500 rpm max
408w stroker, 5,000 rpm max
Forged, neutral balance 408w stroker, 5,500 rpm max
All would be aftermarket stroker kits with aftermarket cranks, 4340 rods, forged pistons & a fully machined block & careful assembly by a pro.
Re: Which build (block) is going to live longer 351w:
I would be looking at an aftermarket block at this power level. That is right on the edge (if not a little over) of where a fully prepped block with stud girdle starts splitting
-
- Guru
- Posts: 1547
- Joined: Thu Sep 29, 2011 8:55 am
- Location:
-
- Guru
- Posts: 4607
- Joined: Sun Sep 18, 2011 11:31 am
- Location: Heading for a bang up with Andromeda as we all are.
Re: Which build (block) is going to live longer 351w:
So only the 69 block would be run with boost?
If so I would not go anywhere near the 700 hp level without Aluminum Rods, a girdle and a custom 8 counter weight Crank!
If so I would not go anywhere near the 700 hp level without Aluminum Rods, a girdle and a custom 8 counter weight Crank!
You can cut a man's tongue from his mouth, but that does not mean he’s a liar, it just shows that you fear the truth he might speak about you!
-
- Pro
- Posts: 217
- Joined: Sat Mar 08, 2014 12:35 pm
- Location:
Re: Which build (block) is going to live longer 351w:
I would consider it but would first like to try this block. If I have to drop the power level to 650 max then so be it. I am not sure of the limitations but do know limiting the rpm helps tremendously.travis wrote:I would be looking at an aftermarket block at this power level. That is right on the edge (if not a little over) of where a fully prepped block with stud girdle starts splitting
-
- Pro
- Posts: 217
- Joined: Sat Mar 08, 2014 12:35 pm
- Location:
Re: Which build (block) is going to live longer 351w:
Sounds good. I thought modern day 4340 rods help. What brand aluminum rod do you recommend?mag2555 wrote:So only the 69 block would be run with boost?
If so I would not go anywhere near the 700 hp level without Aluminum Rods, a girdle and a custom 8 counter weight Crank!
I will just limit hp to 600-650 if 700 or more is excessive at those rpms.
Does more stroke (3.5" vs. 4.0") WITH a low rpm, under 5,500 have an effect on longevity?
-
- Guru
- Posts: 2858
- Joined: Thu Jan 06, 2011 8:57 am
- Location:
Re: Which build (block) is going to live longer 351w:
Aluminum rods can help tremendously when it comes to keeping flimsy parts together at high power levels. About 15 years ago I helped a friend build a blown alcohol Chevy 350. Production block, filled to the bottom of the water pump holes, stock caps, stock forged crank, Manley aluminum rods, TRW lightweight flat top pistons. He used to bury the Autometer Monster tach on nearly every pass and it ran 8.80 in a 3200lb pickup for more than 100 passes without failure. I don't think it would have done that with a steel rod.
-
- Guru
- Posts: 4607
- Joined: Sun Sep 18, 2011 11:31 am
- Location: Heading for a bang up with Andromeda as we all are.
Re: Which build (block) is going to live longer 351w:
Stroke is a factor, but first and formost it's the G force loads on the main web that go up with the square of the rpm!
If you can make the same HP at 6000 with more boost like you could at 8000 then you have cut in half the loading on the block.
If you can make the same HP at 6000 with more boost like you could at 8000 then you have cut in half the loading on the block.
You can cut a man's tongue from his mouth, but that does not mean he’s a liar, it just shows that you fear the truth he might speak about you!
-
- Guru
- Posts: 1547
- Joined: Thu Sep 29, 2011 8:55 am
- Location:
-
- Guru
- Posts: 1029
- Joined: Mon Sep 10, 2012 1:55 pm
- Location: Anaheim, CA
Re: Which build (block) is going to live longer 351w:
Aftermarket iron block. The 351W block ( even the '69 version) will split the main webs at that kind of boost/power. You could waste money adding aftermarket caps , but it will still fail. Get the aftermarket block with 2.750 mains for less heat and more strength.