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  #31 (permalink)  
Old 10-09-2013, 05:29 PM
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He can build a solid motor for $1500 & reach his HP goal.I totally agree about the pistons.I wouldn't go with used.Too much risk.I would get theheads, block,rods,& crank took care of & then go from there.A brand new set of the Summit hyper flat tops are just over $100,or,like bygddy said,go with 1 of their rebuild kits.
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  #32 (permalink)  
Old 10-09-2013, 05:33 PM
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The 186 heads will do pretty good.Really good with some porting.I do think you'll have to go over .450 lift to get the flow for 350 HP on them stock tho.
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  #33 (permalink)  
Old 10-09-2013, 05:41 PM
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What intake did you say you had? What headers?
A kit like this (part number will change depending on bearings)
http://www.summitracing.com/int/part...-300/overview/
I wouldn't zero deck the block if it could be avoided, just a light cleanup
Your squish won't be ideal at .060 (using the supplied head gasket in the kit) but at just a shade over
9.5:1 comp this should be a big issue if you keep an eye on fuel and timing.
A simple cheap cam from summit such as this
http://www.summitracing.com/int/part...make/chevrolet
A set of summit racing stamped steel rockers for $50 bucks...
If the intake isn't a performer RPM, sell it , then go buy one....
This will make a nice torquey street motor that should hit your power goals in budget....
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Old 10-09-2013, 06:10 PM
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What's the different between the flat top piston and the circular piston. The ones I have is just round and plain. I do have a performer dual plane intake. With my heads and block deck. It's gonna cost me 300 for both. So I need to buy new pistons huh. What kind?
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Old 10-09-2013, 06:14 PM
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Sorry I see what kind of pistons. I also have my crank at the machine too. With all this what kind of size cam and what brand I need and what size carb. Will a 750 carb be too much. Can I put roller rocker in my block too.
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Old 10-09-2013, 06:18 PM
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What's the different between the flat top piston and the circular piston. The ones I have is just round and plain. I do have a performer dual plane intake. With my heads and block deck. It's gonna cost me 300 for both. So I need to buy new pistons huh. What kind?
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Old 10-09-2013, 06:32 PM
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The OEM circular dish will resemble a shallow bowl on top.It will have approx a half inch wide raised band around the outside circumference of the piston top.Flat tops will either be completely flat across the top ,or,have 2 or 4 valve reliefs.(half moon indentions).The circular dish doesn't provide a good squish for a complete & efficient burn.The flat tops can raise CR a little too hi w/ 64 cc heads.A good compromise between the 2 is a D cup piston like a KB-193.It has a flat section to provide proper squish,& a dished section to lower CR.If you have flat tops w/ no valve reliefs,your CR is most likely gonna be too high for iron heads & pump gas.Cam selectio can help get it to a point that it'll work.
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  #38 (permalink)  
Old 10-09-2013, 08:06 PM
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The performer is fine for a goal of 350hp and you are not winding past 5500rpm.

I have found that the performer is the manifold of choice with a build at or under 350" , 9:1 or less compression, cam .420-450 lift, and 3 series gear or less.

The RPM worked awesome with 9.5:1 comp and higher, small blocks at or larger than 350" ,high 3 or 4 series ring gear, etc.

I would not go sell it for the RPM just yet. It might work out.

Pistons, yeah. Again at 350 hp stock are adequate.

The stock have a slight dish like 6cc, it means the compression will be slightly less with the dish. The true flat have no combustion chamber space.
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  #39 (permalink)  
Old 10-09-2013, 08:09 PM
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Quote:
Originally Posted by Finley View Post
What's the different between the flat top piston and the circular piston. The ones I have is just round and plain. I do have a performer dual plane intake. With my heads and block deck. It's gonna cost me 300 for both. So I need to buy new pistons huh. What kind?
Pistons are in the kit, you need to pay attention to how much they are taking off the deck. Make sure they are only taking off the minimum to clean it up.

If your intake is in fact just a Performer then sell it, pick up a new or even used Performer RPM, the difference is significant.
Yes, you can use roller rockers but why bother? Your not going to be turning the motor real hard and your on a real tight budget.

Cam choice, well again, there's many factors here, usage, converter, gear, among more.
But the heads aernt going to flow enough to use anything with a bunch of lift anyways.
An 80's G-Body is likely a 700R4 or 200 4R trans, and 342 or 373 rear ends are fairly plentifull.
A simple 268 cam will get the job done on a stock converter , its going to have a fairly high DCR which Joker touched on earlier but having built virtually the same motor a few times now I know it works well on premium pump and carefully timing.

Carb, a 650/750 will work great, either or, I like mechanical secondaries but a vacuum secondary 750 would likely be ideal.
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  #40 (permalink)  
Old 10-09-2013, 08:19 PM
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Quote:
Originally Posted by spinn View Post
The performer is fine for a goal of 350hp and you are not winding past 5500rpm.

I have found that the performer is the manifold of choice with a build at or under 350" , 9:1 or less compression, cam .420-450 lift, and 3 series gear or less.

The RPM worked awesome with 9.5:1 comp and higher, small blocks at or larger than 350" ,high 3 or 4 series ring gear, etc.

I would not go sell it for the RPM just yet. It might work out.

Pistons, yeah. Again at 350 hp stock are adequate.

The stock have a slight dish like 6cc, it means the compression will be slightly less with the dish. The true flat have no combustion chamber space.
Most of the stock dish pistons I have come across are usually in the 12-14cc dish area....
The summit/kb flat tops are a 4 valve relief true flat top and they come out at 6cc's.
I agree with the performer intake being sufficient for 350hp on a motor with decent heads. I used one on my Vette with heavily ported 416 heads and a Qjet and it was enough to put it into low 13's....but I suspect the heads flowed better then stone stock humps. So I reccomended the performer rpm based on the "every little bit helps" theory lol.
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  #41 (permalink)  
Old 10-10-2013, 08:00 PM
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Since I have mostly everything. Can I get close to 350 hp out of my block. I have a dual plane intake,750 carb, header and going with 3 inch exhaust,3.73 gears in the rear end,268 cam, .030 bored over with dish pistons,stock crank. Is this close to 300+ hp or not.
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  #42 (permalink)  
Old 10-10-2013, 08:05 PM
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I believe you will have 300 plus hp,yes
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  #43 (permalink)  
Old 10-11-2013, 02:14 PM
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For what it's worth, I have consistently seen a 30-40 horsepower gain using an RPM over a standard Performer. Chevrolet originally used the high-rise design on a 302 cubic inch motor (Z-28), so they will work on most anything in my opinion. Some fellows get their shorts all knotted up at the operating range, 1500 to 6500, saying that they need power from idle. When is the last time you needed full power at 1400 rpm's????? With any kind of torque, even a stock converter will stall to 1500. Get real!

I've said it before and I'll continue to say it......The Edelbrock RPM intake manifold (or 300-36 Holley or 8016 Weiand) will make more power from 1500 to 6000 (single plane begins making more power at just over 6000) than any other intake manifold, including all other dual-plane and all other single-plane models. It is the END-ALL for naturally-aspirated street-driver motors using a single 4-bbl carburetor and operating between idle and 6000 rpm's.

The Holley and Weiand models have been discontinued, but may be found used on Racing Junk, craigslist, ebay, etc.
Here's a new Holley on ebay for a buck, fifty.....
http://www.ebay.com/itm/Holley-300-3...-/281162148725
And here's a new Weiand for a buck, fifty. This is the original Stealth intake for a SBC.....
http://www.ebay.com/itm/New-Weiand-8...a1dc92&vxp=mtr
.
.

Last edited by techinspector1; 10-11-2013 at 02:39 PM.
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  #44 (permalink)  
Old 10-11-2013, 04:15 PM
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Wait , end all... Inspector you are wrong. If you build you vehicles to perform correctly on the road, you might want to take the pepsi challenge.

You have placed a RPM intake on a running bone yard stock 350v8 car, correct? No aftermarket cam or gear or stall. If you did this in a full size stock RWD, you would have found out you lost the ability to peel the tires. It becomes a dead player.

This something you find out pretty early, as intake swaps are one of the first common mods. To make it work for general situations you need to build the whole package.

I have had the experience of building a 350 with the 4 edelbrock packages(performer, torquer, rpm, victor) in the same chassis. Driving them in traffic/highway, etc.

I think there is a lot of confusion cause people are building cars that race on the street, and there is the problem. You get a poor road car, and a poor race car.

Last edited by spinn; 10-11-2013 at 04:22 PM.
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  #45 (permalink)  
Old 10-11-2013, 05:12 PM
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If you are saying, a 350 built for the RPM intake is the end all. I totally agree.
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