de-stroked 400sbc = 352 ci

[dukesracin]

Looking to get some opinions on this engine combo:
400 sbc, 327 crank, steel head for super street 365 ci limit
Have any of you tried it?
Everything I can find on it says it is a monster rpm motor, gimme your opinions
Thanks
Duke

[streetstocker6]

I have heard alot of good things about destroking a 400 with a 350 crank, so I dont see why that wouldn't work either. I think you would probably have a good combo if it is legal and you can balance how much top and bottom end power you need.

[DOCCALLAHAN]

i know some of the bigger teams that have a ubic inch limit use a 400 block 6200 rod and a 3.335 stroke crank and turn the crap out of it

[dirtywhiteboy]

turns up real quick an likes da higher end of da rpm range,..if you use a small journal 327 crank,..you will need da barring spacers,..ant hard to find....

[dukesracin]

Thanks everybody!
I was thinking of using the 327 crank to keep it under the 365ci limit.
I just don't know how much more money is involved in this combo as opposed to a 350 straight up.
Thanks again:american_salute:

[dirtywhiteboy]

Thanks everybody!
I was thinking of using the 327 crank to keep it under the 365ci limit.
I just don't know how much more money is involved in this combo as opposed to a 350 straight up.
Thanks again:american_salute:
just the spacers,..an rods,..id use some good rods!!!,..an you will need some good breathing heads to enjoy the high r.p.m.s correctly!! that should be only diferance between this an a 350/350....

[The_Intimidator]

Technically, you have to turn the crap out of it to get it to run.

The dirt late model teams usually run a large bore / short stroke motor only because you get some advantages out of running a larger bore and a shorter stroke, but it kills the low end torque.

You do not use bearing spacers in a late model engine. The reason why not is because when you build and blue print the motor, you align hone the bearing journals and the bearing spacers are not consistent with the bore.

The proper way to build the engine is to use a new set of bearings inside of the bore and then hone them to fit and then machine them to accept the next size smaller bearings for the crank.

Hendrens Racing Engines can help you with any questions you might have on how to have it done and where to have it done and what components to use to build the engine and they might have some used Late Model Engines laying around the shop that are already built that they can sell you at a decent price as opposed to buying everything new.
http://www.hendrensracingengines.com/

Ask for BILL or Steve

[dirtywhiteboy]

bill hernden is one of the best,..an a hell of a nice guy!!:check_flag:

[5dirtracing]

i know someone that used this combination(400 w/ 327 crank) in an open wheel ran great but they ran alot of gear in it, i have heard of someone using 3.00'' stroke crank in a 400 block but they had to run even more gear lost too much bottom end, if you are limited on your heads you would be better off with a straight up 350, if torque is a on your mind and under 365ci hears an idea 307ci .030'' or .040'' over block and 3.75'' stroke if running limited heads.. better than the 305 stroker the hard thing would be finding a block.

[The_Intimidator]

Bill H did that one year and won a track championship for his driver with the 307 set up - but they broke 4 blocks doing it. You have to whittle out half the oil pan rail to get the crank to fit.

The 307 block was thin wall casting and not very durable. The only difference on the crank between the 327 and the 307 is the balance and the fact that the 307 cranks were all cast and the 327 cranks were mostly all steel.

The trick is to find the right combination of crankshaft and engine bore to compliment each other. If the only rule was a CID rule..

I would guess that a good combination would be to use a 3.500 crankshaft and a 6.0 inch rod and a 4.030 bore. That would give you a 357 CU inch engine - right inside of the limits. I would run flat top pistons and 18* heads and run the pistons .025 out of the hole with a .045 head gasket.
With the right heads and the right camshaft it would produce about 500 - 600 HP with no problems and would spin 8500 Rpm's all night long with a wet sump motor or 9200 Rpm's with a dry sump.