vortec block strength

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Jginger
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vortec block strength

Post by Jginger » Tue Oct 02, 2018 8:23 am

how far have you pushed a 4 bolt vortec block ?
I am thinking studs an straps and give a try. Round track, need around 600 hp 1/3 mile.

Newold1
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Re: vortec block strength

Post by Newold1 » Tue Oct 02, 2018 9:34 am

Switch out the caps for a set of billet caps w/ARP studs, a lightweight forged crankshaft with honda size journals , lightweight h-beam rods and a good set of lightweight forged pistons with 1.5mm/3.0mm rings, a good windage tray setup and oil pan and 600HP at lets say 7500rpms and under should be no problem with a good set of heads cam and intake. Need to spin it 8000-9000rpms, get an aftermarket block! :wink:
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Jginger
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Re: vortec block strength

Post by Jginger » Wed Oct 03, 2018 8:17 am

Thanks, Newold

David Vizard
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Re: vortec block strength

Post by David Vizard » Wed Oct 03, 2018 11:31 am

Jginger wrote:
Tue Oct 02, 2018 8:23 am
how far have you pushed a 4 bolt vortec block ?
I am thinking studs an straps and give a try. Round track, need around 600 hp 1/3 mile.
Just for the record I have had two blow out the sides at about 550 hp!

Its a nice block for a 475 hp street build cranking out 500 lbs-ft but I go straight to an early 4 bolt block or an aftermarket block for a 600 hp build.
DV
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Jginger
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Re: vortec block strength

Post by Jginger » Wed Oct 03, 2018 12:58 pm

Thanks David, I may have to rethink this.

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Re: vortec block strength

Post by cab0154 » Wed Oct 03, 2018 1:36 pm

David Vizard wrote:
Wed Oct 03, 2018 11:31 am
Jginger wrote:
Tue Oct 02, 2018 8:23 am
how far have you pushed a 4 bolt vortec block ?
I am thinking studs an straps and give a try. Round track, need around 600 hp 1/3 mile.
Just for the record I have had two blow out the sides at about 550 hp!

Its a nice block for a 475 hp street build cranking out 500 lbs-ft but I go straight to an early 4 bolt block or an aftermarket block for a 600 hp build.
DV
I dont even believe it. According to all the chevy guys around here the Ford 302s are the only ones that crack at that hp level. Good info DV! =D>
"Anyone who thinks the low RPM engine will be faster just does not have as much experience as the rest of us" -The late, great Joe Sherman.

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needforspeed66gt
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Re: vortec block strength

Post by needforspeed66gt » Wed Oct 03, 2018 2:57 pm

David Vizard wrote:
Wed Oct 03, 2018 11:31 am
Jginger wrote:
Tue Oct 02, 2018 8:23 am
how far have you pushed a 4 bolt vortec block ?
I am thinking studs an straps and give a try. Round track, need around 600 hp 1/3 mile.
Just for the record I have had two blow out the sides at about 550 hp!

Its a nice block for a 475 hp street build cranking out 500 lbs-ft but I go straight to an early 4 bolt block or an aftermarket block for a 600 hp build.
DV
Agreed - those late model blocks were cast with the minimum amount of iron possible and most don't even have enough cylinder wall thickness to go .040 and read under .090" wall in places when at .030" over.

Dart SHP and then you don't need to worry about it. Why spend the money on cap conversions? It's polishing a turd IMO
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Newold1
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Re: vortec block strength

Post by Newold1 » Fri Oct 05, 2018 4:10 pm

Please understand that I am not proposing that you take a stock or near stock pre-1998 Vortec 5.7liter short block and increase the power up in the 550HP plus area with stock main caps and bolts, stock rods and pistons and a stock cast crankshaft. If you keep the overbore small, .030"or less, use 4 bolt billet caps and ARP bolts, use a good forged crankshaft with a 4.375 stroke some nice H-beam rods with good lightweight forged pistons along with great machining and assembly coupled with a nice set of properly reworked Vortec heads and a good hydraulic roller camshaft spec and intake system and headers you can build a very reliable 450-600HP Vortec block 383. IN the early 2000's I built quite a few for trucks and boats and a couple I remember with a Kenne Belle supercharger and reasonable boost made great HP , truck dynoed 595WHP at 6800rpms and big torque numbers and I know this particular truck is still operating and racing sometimes today with no rebuild or blow-ups. Taking these blocks with larger overbores and using to many stock components will not get these power levels done without problems. JMO
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Re: vortec block strength

Post by pdq67 » Fri Oct 05, 2018 4:29 pm

Newold1,

You mean a 3.75" crank to make a 383??

pdq67

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Re: vortec block strength

Post by Newold1 » Fri Oct 05, 2018 6:02 pm

I am loosing it -EEK! ,CRS disease To much BBC data in my tiny brain! :shock:

Your right at 3.75" and the rear WHP on that truck was 495HP! #-o
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Jginger
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Re: vortec block strength

Post by Jginger » Fri Oct 05, 2018 6:40 pm

this happens to be 2002 block, any diffs between a pre 98 to after.

Thanks for the feedback

Newold1
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Re: vortec block strength

Post by Newold1 » Fri Oct 05, 2018 9:32 pm

I can't say in my experience as I never worked a 2002 and newer block. Don't think so but maybe someone else here does?
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Keith Morganstein
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Re: vortec block strength

Post by Keith Morganstein » Sun Oct 07, 2018 10:33 am

The OP is asking for a circle track application. Way more cycles and stress.
The earlier blocks with 2842 main caps are pretty stressed out at 600 HP in a circle track application. I’d avoid the later weaker blocks.
Automotive Machining, cylinder head rebuilding, engine building. Can't seem to quit #-o

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