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Old 06-14-2002, 07:42 PM
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Post Small Block 400

Ive got a 69 camaro 4 speed with a 350 pushing 400hp. I was looking into getting a 400 small block engine to bolt right into place of my 350. Ive been told that the 400 to get is the one with the harmonic balancer that is shaved on one side. I believe this means its externaly balanced. Is there any difference in the 400 engines? if so which one is better to get for street/strip? Also, If I put my cam, heads, and intake on the 400 from the 350, will it perform the same?? Im sure the 400 will have much more torque, but will it hold the rpms of the 350?? Will it have more horsepower?? If not, what would be a good cam for that engine that would make it perform the best on the street/strip?? And Would I be able to use my flywheel from the 350?? Any info would be helpful, thanx

[ June 14, 2002: Message edited by: chevyelc81 ]</p>

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Old 06-14-2002, 09:51 PM
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Need a little more info. on what you have to install on the 400.but external balanced is 400 fly wheel and harmonic balancer.350 heads will have to be drilled for the simease steam holes in between the bores of the 400 block.just a little info.(wrenchturner)
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Old 06-15-2002, 12:24 PM
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if u know so much then why do ask so much duhhh?
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Old 06-15-2002, 07:04 PM
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chevy 400...4.125 bore 3.75 stroke 5.56 rods 2.65main journals,siamesed water jackets between bores.to make one run change the rods to 5.7 or 6 inch,don't bore more than 30, use hardblock partial fill,check rod bolts for cam clearence.To use 350 parts in a 400 drill steam holes in the head,you will need bering spacers or spacer berings or get an aftermarket crank with 2.65 mains(Scat or Eagle)with 350 crank use 350 balencer and flywheel
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Old 06-15-2002, 07:14 PM
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Thanx for all the info, im a little confused on were I need to drill in the heads and how big of a drill bit I need, some info on that would help alot.
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Old 06-17-2002, 09:30 PM
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Im running a set of 2.02in 1.60ex 64cc heads and a 234in 244ex .488in .510ex cam in the 350 with the performer intake and 750 edlbrock cam. Im planning on putting the heads, intake, cam and carb on the 400 from the 350. The 400 is a 2 bolt main out of a 1977 pickup truck 4WD. Its all stock(pistons, crank, rods). The engine is going into a 69 camaro 4 speed with 3.55 gears, dual 2.5 inch pipes with 40 series flowmasters, full length headers, MSD ignition. Will this engine perform like the 350, or since its a larger cubic inch, will the cam be less radical than it being in the 350?? I just want a basic idea of how its going to perform compared to the 350 before I do all the work of dropping it in. If its not going to push my car faster down the quarter mile than the 350, I want to build it to without changing pistons, rods, and crank. Anyone familiar with the 400 engine, let me know what you think..thanks
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Old 06-18-2002, 02:59 AM
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take the old head gasket fron the 400 and lay it on the 350 head this will show you exactly where to drill the holes are 1/8 or 5/32 and get new head gaskets for a 400. you can use the 400 rods but the angles on them make the engine want to push them out the side of the block,most blownup 400s I've seen had massive holes in the side of the block. A longer rod will increase torque and horse power,reduce the radical eccentric movement inside your engine,in other words wake it up and live
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Old 06-18-2002, 04:42 PM
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ok, thanks for the info.... one more thing, will 350 5.7 rods fit on the 400 crank??
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Old 06-18-2002, 05:45 PM
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NO,the jurnal size is smaller on the 350.
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Old 06-18-2002, 06:10 PM
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1BAD80 is wrong the rod berings in a 400 are the same size as the 350, the main journals are different. To put 350 rods in a 400 you must change the pistons because the compression height will be different and you will have to check the clearence between the cam lobes and the rod bolts,you can probably get a set of hyper pistons for under 150.00 that will have the correct compression height(point of measurement for the piston pin location)I have been gathering parts to build the 400 I have,got a 71 4bolt block,6inch eagle rods,202 fulies,327 steel crank,66 corvette alum intake,cloyes hi dollar time set.melling pump,Z/28 valve springs,arp main stud kit so far I need the pistons,plan brc 030 flattops,and camshaft going solid lifter then the machine shop work,this will give me 353CID and an engine that will rev unbeliveable and look bone stock
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