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Old 01-13-2004, 03:06 PM
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Hey guys....

Starting to get to the point where i'm going to start buying parts for my engine. The plan is to build a SBC 400 and destroke it to a 377 so I can still have a great amout of HP, parts are easy to find and I can have a nice high side rev.

The plan is a Small Block 400ci block with the following rotating assembly.


I'm not sure WHICH of these i'm going to go with but i think i like the flat top (I've heard a lot of people use them and I figure that if they were that bad i would have heard more bad things about them) but if anyone can make any other suggestions I'm open to them.

THe heads.... Prolly Cast VORTEC heads from GM performance. LIke 289 a head. And i hear the performance is pretty good.

I think i'm limited to what I can use for intakes with those heads so i'll prolly use a polished alum intake made for them.

Carb will prolly be a bolt on of some kind (edelbrock?)

CAM? Geez, I don't know. Suggestions are VERY VERY encourages on this. For the sake of arguement i'm going to throw out this (i'm SURE it's wrong though)

Let's say .470 lift 270 duration @ .050 ?????

If anyone can guess at some HP/Tq #'s i'd love to hear them. I tried destktop dyno but i'm not smart enough to make it function.

Can anyone think of anything that i haven't listed here?

Any other predeictions, warning, cheaper prices or suggested upgreades are MORE THAN WELCOME.

And in advance, YOU GUYS ROCK!!! This is the best board on the net and i will try to help out anyone else that i can.


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Old 01-13-2004, 03:30 PM
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I've got a 406 with Vortec heads. I used dished pistons to keep the compression down to pump gas, but I'm still at 10:1. That's about the max for pump gas and iron heads.
I'm running a Comp Cams Extreme Energy 268. It's range is about 1600 to 5000??
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Old 01-13-2004, 04:08 PM
4 Jaw Chuck's Avatar
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Destroking it will only reduce your displacement, it's a waste of time.
“She may not look like much, but she's got it where it counts, kid. I've made a lot of special modifications myself.”

— Han Solo
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Old 01-13-2004, 04:15 PM
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4 Jaw is correct. For what you have listed as possible heads and camshaft you are going to need something that rpms because these parts won't make power up there. I would also suggest just building a 5.7 rod 406 CID. I would put a set of SR Torquer World products on the engine with a miled .500 lift cam on a 108 Lobe sep. All around good usable power.

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Old 01-13-2004, 07:38 PM
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If you have the 400 crank use it and put it back together as a 400. You'll be glad you did later especially after you drive a well tuned 377 and a 400 back to back on the street. I prefer using 5.7 rods too. Stock chevy 5.7 rods almost always hit the cam on 3.75 stroke applications. If you can afford it buy good rods. If not grind yours to clear your cam and have the assy balanced after you finish grinding. 377 are great Modified dirt track engines where the engine lives between 5500 and 8000 RPM's. For the street I'll take the 400 anyday, more torque and HP between 2500-5500 will equal a bigger smile on the street.

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