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Old 03-11-2013, 04:10 PM
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New here, big fan of the forum, need a little help from the experts and vets please!!

Hey guys been doing a lot of reading on the forums about 350 builds, alot of you know your stuff! Would love to have some opinions and expertise on what I'm working on right now!

To start I'm having a 350 built up.

Stock remanufactured engine from Sparta Engines with less than 1k miles on it.

Edlebrock 1406 600cfm and unsure of the aftermarket aluminum intake on it

I just purchased these heads this weekend got an insane deal hence why I kept Iron heads instead of aluminum. Here are the specs

HIGH PERFORMANCE HEADS
Ported and Polished
Heads are #441 with 74cc combustion chamber.
Manley Pro Flow valves. Valves 2.05 Intakes and 1.60 exhaust.
Crane 1.460 dia. valve springs produce 129lbs seat pressure @ 1.875 height
Valves are +.100 longer with stem undercut 5/16".
3 angle valve job 30 degree top 45 seat and 60 bottom.
Valve locks 10 degree chrome moly 11/32" with Manley steel retainers.
Push rod 3/8" Manley screw in guide plates
New Winona bronze valve guides
Erson 1.6 Aluminum Roller Rockers
Heads have never been used.


Cast Rods, Piston and Crank

Cam kit ordered with double roller timing from Comp cams is #12-234-2
212/218 @ .050 256/268 with .447/.456 with 110 degree lobe sep

I have no idea what kind of compression I'm looking at I'm ballparking hopefully 9:1 or a little higher I will be using .020 steel shim gaskets and the deck height is stock.

1 and 5/8 ceramic coated headers to 2.5 dual exhaust

Rear end gears are stock, i think 3.08 with a 700r4. Will be upgrading down the road. 33inch tires as of now. It is for a 86 K5 blazer.

What kind of HP/TQ numbers am I looking at and I'm open to suggestions and all advice is greatly appreciated!

Thanks so much guys!!

Mike

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Old 03-11-2013, 04:57 PM
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350 build

Hard to guess at the compression ratio and hp estimation. Need to know what pistons are in it to even make an educated guess. If they are bone stock...you're probably in the 8.5 to 1 range with those heads. You may be in the 200-225 hp range...and thats just a guess. Most of the smog era chevy small blocks were very low compression and 165-185 hp. Can you give me anymore information?
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Old 03-11-2013, 05:00 PM
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Quote:
Originally Posted by snakebit68 View Post
Hard to guess at the compression ratio and hp estimation. Need to know what pistons are in it to even make an educated guess. If they are bone stock...you're probably in the 8.5 to 1 range with those heads. You may be in the 200-225 hp range...and thats just a guess. Most of the smog era chevy small blocks were very low compression and 165-185 hp. Can you give me anymore information?


Thanks for the reply, and yes they are stock pistons. 200-225 seems extremely low. Those heads have about $2300 worth of work done to them, which is why I got them, but barely paid a fraction of that hence why I decided to go with them. The guy who built them had them built for a blower set up to push out 670hp, granted the rest of his engine was going to be forged and built for it and mine is not. But I figured with the ported heads, roller rockers, and all the work done I had some good flowing heads even though they are a little bit bigger in chamber size at 74cc.

Thanks!
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Old 03-11-2013, 05:05 PM
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Just with the intake, carb, headers, exhaust and cam I should be well over 275HP I would assume.
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Old 03-11-2013, 05:21 PM
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350 build

I guess I didn't see the entire post on the heads. Yes, 74 cc heads are a large chamber and will affect the compression ratio. I was simply figuring the pistons at the lowest possible dish and compression. As I reread your post and plugged in the numbers I came up with 9.1-9.2 CR. With the flow of the heads I would push my estimation up to 285-300HP. I gave worst case scenario...sorry.
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Old 03-11-2013, 05:26 PM
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No worries thanks for your input, so with my entire set up what kind of pistons would you personally recommend to get me to 10:1 compression, I really do not want to go much higher than that. I have no idea what I'm looking for when shopping around for pistons etc. My ultimate goal with all that I have is 350HP and 380+ torque.
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Old 03-11-2013, 05:31 PM
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low power?

Quote:
Originally Posted by snakebit68 View Post
I guess I didn't see the entire post on the heads. Yes, 74 cc heads are a large chamber and will affect the compression ratio. I was simply figuring the pistons at the lowest possible dish and compression. As I reread your post and plugged in the numbers I came up with 9.1-9.2 CR. With the flow of the heads I would push my estimation up to 285-300HP. I gave worst case scenario...sorry.
Snakebite is right on or,,,
with out knowing the deck height his estimate might be high in my opinion.You dont say how many CFM the heads flow and at what valve lift?That camshaft might not be correct for the CR/heads
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Old 03-11-2013, 05:38 PM
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I know the deck height is stock at .025 as far as the flow of the heads unfortunately that wasn't listed in the specs when I bought the heads, I'm trying to get back in contact with him to ask but what I have listed is all that I know.
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Old 03-11-2013, 05:50 PM
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350

I would imagine the heads have high flow numbers if they were built for a blower...but numbers, numbers, numbers....engines are truly a math game. My experience with 350's with a stock deck height and gasket...flat top pistons w/ valve reliefs...74 cc heads...should net you roughly 9.8 : 1 Thats just an average based on experience. Horsepower isn't everything...torque is king for getting you rolling. Horsepower only comes into play at the end of the track at higher RPMs. Torque is your launch and midrange
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Old 03-11-2013, 05:59 PM
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Hopefully I can net some good number, I feel like a total idiot because I'm such a newbie to all of this but I've put in countless hours researching and trying to piece together what I thought was good. Looking back I now wish I had went with a set of Vortec heads. I spent 700 on these heads and then just spent 350 today on the cam kit from comp cams. I really hope I didn't just throw over a grand away on nothing. I'm still trying to decide what to do whether or not to try and sell them or make them work. I'd like to make a decision before I drop $ into labor on the install.
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Old 03-11-2013, 06:17 PM
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350

No, no, you didn't throw your money away. You can build your block around a good set of heads. Get a decent set of pistons in that beast and she'll come to life.
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Old 03-11-2013, 06:27 PM
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No, no, you didn't throw your money away. You can build your block around a good set of heads. Get a decent set of pistons in that beast and she'll come to life.

Ok awesome that makes me a lot less sick to my stomach haha The Stock 441 heads are rated at 255HP. So being Fully Ported, aluminum rockers, bigger valves etc I figured they had to put out much more HP, then you add in the intake, carb, headers/exhaust, and a cam I figured I'd be putting out at least 330-350 HP with 380 ft lbs torque.

I'm looking on Summit right now for Pistons, but like I said I have no idea what I'm really looking for, do you have any recommendations Snakebite? Thanks man!
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Old 03-11-2013, 08:56 PM
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The 441s are not great,but stock they could make over 400HP with enough other quality parts
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Old 03-11-2013, 09:21 PM
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Do you think with all I've listed they are the quality parts needed, the heads are built as good as they can be, as far as everything else I thought I had a pretty good combo, 400HP would be amazing, but I'd honestly be happy with about 350-360 hp and 390-410 lbs of torque. I use to have a Vortec max Silverado and I'm trying to build my K5 about as strong as it.

So if I don't have the quality parts what am I lacking?

Thanks again guys for you're input and help it is much appreciated!
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Old 03-11-2013, 09:51 PM
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If you have 9.2 ish CR and the unknown intake is ok?I would bet 350 ish torque and 310 HP. The carb you have is smaller than stock and that cam is maybe good to 5,000 rpm.
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