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'73 Camaro NETO/N
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Discussion Starter · #1 ·
Hello there. I've got a complete small block Chevy top end off an engine that I threw a rod through. I am now entertaining the thought of another build. The parts I have include...

•AFR 220 Eliminators, 1110 competition ported heads, 8027 spring upgrade, titanium retainers, 65cc
•Crower stainless steel full roller rockers, 1.5 ratio
•AFR stud girdles
•Comp Cams 300BR-6 solid roller, 260/270 @.050, .630/.630, 106° lsa
•Comp Cams roller lifters
•Weiand Team G 7531 single plane manifold with 2" raised plenum, port matched
•One complete virgin Chevy 400 2-bolt engine (never disassembled)

•Rotating assembly... to be determined

I'm looking to build a high compression 406 cu in full race engine for nostalgia bracket racing.

-My first option is to have the Chevy 400 block machined for 4-bolt splayed main caps, punch it out to 4.155, and drill steam holes in the AFR heads.
-Next option is to purchase an aftermarket block and have the required machine work completed

If this was your build...
-Which option would you choose?
-Which aftermarket block would you choose?
-What are the pros and cons of each?
 

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Spend the money and buy a Dart Little M or SHP. Forget about the Chevy 400 SBC blocks. They're the weakest of the bunch.
 

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SHP, Little M, Motown, You'll gain up to 20 hp with the better block. Cylinder bore stability, better ring seal, and stronger block that can be bored without thinning walls.
 

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I've been at this a while. Didn't have good blocks years ago. You will have a lot of money in the block going the splayed route. In the end the block may still crack. I know that some will say they got away with it, so did I for two seasons. Then split. Not to mention loss of power due to ring seal. SHP is a no brainer.
 

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Little M for the win !'
I have had several 400 SBC and still run a stock block in my " street car" altho it has been good to be I still limit it to 6400 -6500 rpm I have witnessed several of them fail. When I got my Little M and felt the weight of the block and the casting I know that it could take what ever I could throw at it and probably more.
 

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'73 Camaro NETO/N
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Discussion Starter · #15 ·
Thanks for the informative replies. I was asking about the stock block because my old man has had that stock 400 sitting in his garage for decades. He always wanted to do a 406 track build with it and never got around to it. I was already leaning towards a Dart SHP, as I have another recently completed 11:1 434 build with the SHP.
 

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Don't need steam holes in heads for racing. 400 needs lots of work to the decks to stand a chance of living. Plug the steam holes, plug the big coolant holes and redrill small holes. Additional holes along the bottom coolant holes. (Copy what Bill Jenkins did in his engine books.) SHP or Little M will get you 421" pretty easy. and free HP. Will be a good long term investment, good for several rebuilds. Used parts are bring a premium. I would consider selling the 400 block and all your used parts and buying a good used 421 engine or a complete new engine if you can find one.( I just happen to have a complete Little M aluminum head engine sitting in the corner that needs nothing.) Just sayin..
 

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Discussion Starter · #19 ·
427 / 434 go big or go home
I'm not interested in going any bigger. My goal is to build the engine my father wanted to build, but never got around to it. Not to mention, I already have a recently completed 434 build...

 
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