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Old 05-08-2013, 07:09 PM
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4.3 drag engine

Im building a balanced shaft 4.3. Its .030 over and im using the stock crank and eagle forged h beam rods. I need some help with pistons i want 10:1, intake, and carb ideas. Im using casting number #113 vortec heads port and polished. Also im running nitrous on this engine. Im going to get a comp cams roller hydralic cam. Any ideas on how big? Im using a turbo350 trans with 3500 stall and 4.56 gears i want my s10 to break into the 7s in the 1/8 th mile maybe mid 11s in the 1/4. Any help would be greatly appriciated!!

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Old 05-08-2013, 10:31 PM
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11s with a V-6 N.A.?
500 HP will get a 3300 pound truck into the 11s with tires/suspension ... Thats a tall order for 3.8,,,thats more than 2 HP per cubic inch!
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Old 05-08-2013, 10:58 PM
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Yrs ago I build against my drag race partner's advise a common pin forged crank Bowtie block Brodix 200cc+ headed solid roller 273 stroker hand built single four intake.It was parts left over from when NASCAR ran V6's.I bought it from Richard Childress Racing.

With all that the finished costs was three times the average SBC.My partner once again was right in that anytime you build something different it costs more.Usually alot more.And the re-saleability isn't there.

I ran it in a Chevette in 10.90 class where it would run under the number,so it ran the number like clock work never out the backdoor.The car with me in it weigh was a very light 2500lbs.Not 3200 of a S10.

The reason why I spent 10's of thousands for the common pinned aftermarket parts is the idea that a 4.3 is a SBC with two cylinders cut out couldn't be farther from the truth.I made this decision based on months of research and yrs working at a Chevy engine plant as a engine tester.The only thing in design that is common is the bore size.It has a spit crankshaft with offset rod's to the center's of bore.There is only two options.Offset to the bores where the load is to one side of the bore or center the rods and the load is to the outside of the rod bearings.It is very common to find #3 and #5 bores oval.So there isn't any free rides for long term reliability even on the turbo OEM's let alone prolonged high rpm's.


Your Eagles are going to have to be cut one one side to go on that spit crank.I'm not sure because I didn't deal with a spit crank,but I would take a educated guess with a balance shaft and changing the balance wt with the Eagles the balance could get complicated and expensive.

This link is interchange of OEM parts.Long,but a good read:

Rebuilding the New Chevy 262: Engine Builder

Deal with the SCR and DCR as you would with a SBC found in the Wiki links found in this site.
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Old 05-09-2013, 07:02 PM
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Re your posts?

nOT SURE WHY YOU ARE MAKING POSTS? you should not try to sell something on this thread. Your other post made zero sense to me

Last edited by OneMoreTime; 05-09-2013 at 07:52 PM.
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