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10-17-2003, 08:37 AM
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400sbc build-up suggestions
Well winter is about here and it is time to consider a new engine setup and I am looking for suggestions.
Here is the whole deal: I have a full bodied '66 Chevelle w/fiberglass hood. 400sbc .060 2-bolt Cast crank .020 11:1 TRW forged flat tops .519/.523 Hyd. flat tappet cam 1.6 Crane Roller Rockers Dart Pro 1 Aluminum head 2.08/1.60 230cc runners Weiand Team G intake w/2" raised plenum Holley 750DP modified to flow 830-850cfm Hooker Super Comp Headers 1-3/4" primaries GM HEI w/MSD 6AL ignition 4.56 gears 4000 stall I can't recall but I think the rods are stock I'm currently running 7.50's in the 1/8th but I'm looking to run the 7.0 heads up class. This car will 'always' be street driven (at least on the weekend), so I'm looking where I might make a change in the engine set up to accomplish this. I realize the bottom end needs consideration (new crank), but what about the strength of the 2-bolt? Also considering a solid roller cam, so any suggestions on lift and duration would be helpful also. Let me know what you think.  James 
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10-17-2003, 09:11 AM
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Hi James.
Far from a pro here, but I'll speak from experience and lots of talk n reading. 2 bolts in my oppinion are fine as long as your not reving them to unrealistic rpm"s. I had a pretty stock 350 with dart heads and a team G intake, 4 speed and 4.88 geared Chevelle and I drove the crap outa it with no problem. Average shift point was 6800 and Launched out at 5500-6000 rpm's. As far as street driving, I just see the 11-1 comp as being to hi for pump gas. If you dont mind buying cam 2, then your ok. In all it looks great for a combo. Just keep the revs to normal and you'll be fine. HG
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10-17-2003, 09:45 AM
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Quote:
Man, you did rev the crap out of that thing! That's the way they out to be driven.  Actually what I listed is my current setup. I either run AV gas (100 low lead) or a mix or 93 and AV. I also shift around 6200-6400rpm, and it's pulling the whole time. I just want more.  James
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10-17-2003, 12:17 PM
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From what I have seen I would say that the 2 bolt 400's are stronger than the 4 bolts.
On the converter I suggest calling ATI and getting one of their tree master converters built for your car instead of using a off the shelf converter.... its a little pricey but its the best money I have spent on my car.
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10-17-2003, 05:56 PM
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Are you sure that isn't too much stall? With that combo I would have guessed 3,200 stall would be optimum. 400 torque curves happen earlier on in the RPMs.
As an engine upgrade I would install a 250 hp NOS kit. 150 hp if you want a longer life out of it. That's the way to the cheapest extra horses you will get now.
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10-17-2003, 06:22 PM
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Quote:
It is supposed to be a 4000rpm stall, but it is stalls more like 3200-3400rpm. This has been a great street/strip converter. I have seriously considered nitrous, but I would certainly need to upgrade the bottom end I think. I believe a 150hp shot would certainly put me where I want to be. Thanks for the input. James
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10-18-2003, 08:04 AM
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I was new to cars and I gave it the riot act. It was fun. I bent one pushrod and a valve once, but I bought the heads bare and the guy who installed there inners put cheapo parts in it. Have fun and drive it like ya stole it. HG
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10-18-2003, 09:02 AM
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Id say stick with what you have and add Nitrous, its a very good combo, and I like it, a solid roller would definatly help, but since your driving it on the street, I wouldnt suggest it, low rpm is hard on roller lifters, if your car has a Ati-balloon plate on the converter by all mean's juice it off the line, that is if your drivetrain is up to it...Id say 6's should be easy w/150 shot..
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