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Old 02-15-2012, 07:58 PM
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Small block chevy rebuild advice

i'm looking at two kits on northern auto parts website. what would be the better kit in your guys opinion?
It will be going in a 350 bored .30 with 993 heads.
The motor is going in a 87 3/4 4x4 with 35x15.50 tsl super swampers 4:10 gears

http://www.northernautoparts.com/Pro...CartId=1549102


http://www.northernautoparts.com/Pro...CartId=1543973

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Old 02-15-2012, 09:50 PM
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Neither. Why is because the pistons are "Rebuilder" pistons. Stock 350's from the factory come with a 1.560 compression height. The rebuilder pistons come with a 1.540 compression height. This kills compression and quench.
Next is, I wouldn't run a "stock style" timing set under no circumstances when a double roller only costs little more but is far more durable and does a much better job keeping the cam timing in line.
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Old 02-16-2012, 06:02 AM
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The 2nd kit comes with a double roller, DV. Anyways, I would pick the 2nd kit but I'm not sure which camshaft would be right for you considering we don't know if you have a manual trans or auto and if its an auto, what stall? Another question, have the 993 had anything done to them performance wise?
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Old 02-16-2012, 11:05 AM
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I had read that about the pistons but i wasn't sure which pistons would you recomend or should i just piece together a whole engine kit?

The truck has a sock turbo 400 tranny and it doesn't come out of 4 low much.
The heads haven't had any porting work done but they were redone a few years ago with heavier valve springs.
i forgot to add the its gonna have a weind x-celerator intake with a 600 cfm holley
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Old 02-16-2012, 11:10 AM
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Thanks Troy, I missed that. Even with contact lenses I still can't see.
As for pistons, I've used these in a few builds and for street use they work just fine:
http://www.summitracing.com/parts/SLP-H345ACP30/

Last edited by DoubleVision; 02-16-2012 at 11:21 AM.
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Old 02-16-2012, 11:59 AM
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i'm pretty sure those pistons are offered as an upgrade in the first engine kit and it can also be upgraded to a double roller too.
Thanks for the advice i'm open to and suggestions you guys have.
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Old 02-16-2012, 12:44 PM
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Get the first kit with the H345cp piston upgrade, the c3023xsp timing chain upgrade, the CL1065PK cam from ELGIN (or smaller), Hastings Coated Rings upgrade, and whatever standard water pump you need.
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Old 02-16-2012, 02:16 PM
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i would agree with ap72 esp on the 'smaller' part. i have 33's and 456gears and my Elgin 923P (204/214@50) .448 at valve lift could actually be even more stock to my liking. i have pocket ported 1971 model heads (#'s i forget, but not the same as yours) so that would make a diff, but how much i couldnt say. if you are going to run 35's i would definitely go with a smaller cam tho. better get up and go, esp if you only have 411s. i also have a 4sp and only use 2nd to start off with on the street. and my street performance is what i would want to improve, if i wasnt selling my truck. To really make my answer relevant i would have to know my 2nd gear ratio and your 1st gear ratio, and i know neither. but either way agree with DV and the rest to go with the piston that will put you closer to the deck.
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Old 02-16-2012, 04:39 PM
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According to the Federal Mogul catalog the Speed Pro H345ACP pistons have a 1.548" compression height, so they will still leave you .012" further in the hole. The H345NP and H345NCP (coated piston) are both listed as having the standard 1.56" compression height.
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Old 02-16-2012, 04:52 PM
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They are listed as 1.56 on summit racing so i'll probably call northern and ask before i order.

I'm not really worried about street performance because this truck will probably never see the road again.

Does anybody have an idea of what the compression ratio would be with flat tops and 76cc heads?
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Old 02-16-2012, 05:58 PM
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With the pistons .025" in the hole (1.56" compression height pistons in an un-decked block), 76cc heads, and an .028" thick head gasket (stock Chevrolet gasket thickness) you'll have a static compression ratio of 8.7:1. If you use the Fel Pro #1094 shim head gasket (.015" thick) your static CR will be 8.95:1. With Fel Pro #1003 composition head gaskets (.041" thick) you static CR will be 8.47:1.

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Old 02-16-2012, 06:36 PM
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Thanks BigEd would it be a better idea to run some domed pistons or stick with flat tops?
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Old 02-16-2012, 06:45 PM
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I would stick with flattops. If you want to raise the compression ratio it's better to stay with flattops and use heads with smaller chambers than to use domed pistons.
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Old 02-16-2012, 06:53 PM
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thanks BigEd. I doubt i switch to different heads unless i get the money to get my 186 heads setup.

Would getting a 2000 stall converter open up my cam choices any?
I'm not planning on ordering a kit till later in the spring so i'm just taking advice on what you guys think.
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Old 02-21-2012, 12:56 PM
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i've settled on the first kit now just gotta figure out wich cam would work best. i'm plannin on gettin a 2000 stall converter. Any advice?
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