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Old 02-25-2013, 01:31 PM
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383 stroker or 355 build advice please

Hi I plan on building a 383 stroker or 355 (not sure which) from a 1980 corvette L82 4 bolt main block I picked up for next to nothing. I am shooting for around 400 hp (overkill?)nothing crazy not planning on racing or anything like that. I just want a nice cruiser that I can take to work sometimes and drive on weekends. Here is the build I have in mind for either the 383 or 355

-Edlebrock rpm performer heads PN 60619 70cc Combustion Chambers, 185cc Intake Ports

-Xtreme Energy XE268H, Hydraulic Flat Tappet Camshaft Lift: .477''/.480'' Duration: 268/280

-Edelbrock 1806, 650 CFM Carb

-1 5/8 hedman long tube headers

-Performer RPM intake

So far the only thing i have for this build is an engine block. I want to this cheap as possible as well. I would like this engine to run on 87 octane if possible. I am interested in those heads because I was able to find a good deal on some locally but also considered getting a set pf junkyard vortec heads. I dont have any ideas for a bottom end yet.The 70 C10 has a 700r4. I Please let me know with any ideas suggestions ect I am not an engine builder but I want to build this one lol.

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Old 02-25-2013, 04:33 PM
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buy the heads first. the corvette engines from the late 80s were lame on a good day,ask me.

the heads will determine the entire build.That flat tappet cam is not going to get you to 400 hp
my 81 350 with manifold,modified 650 holley,actually flowing 780 cfm,1 5/8 headers,small comp cam.stock heads made 205 hp at the wheels.

Ive fixed that problem
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Old 02-25-2013, 05:55 PM
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Chad,
Just thought I'd mention that those heads have angled spark plugs, and may prove to be difficult to get a set of headers that will fit. Might be why they are a good deal? See post #3 in link.
I have a set of the straight plug 70cc pn6073 and that was one reason for buying them.
Not saying you can't get headders for them. Just that its something to make sure you look into before buying them.
angle plug or straight plug heads ?which is better [Archive] - Chevelle Tech
FWIW,
ssmonty
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Old 02-25-2013, 06:19 PM
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Quote:
Originally Posted by vinniekq2 View Post
buy the heads first. the corvette engines from the late 80s were lame on a good day,ask me.

the heads will determine the entire build.That flat tappet cam is not going to get you to 400 hp
my 81 350 with manifold,modified 650 holley,actually flowing 780 cfm,1 5/8 headers,small comp cam.stock heads made 205 hp at the wheels.

Ive fixed that problem
That cam on a Vortec 350 has been proven MANY MANY times to end up in more than 400hp- flywheel though, not rear wheels.

And as noted HEADS are the most important part, as such I would not get those Edelbrock heads, for the same price look at some Jeg's or Summit house brand heads (Jegs are Profilers, Summits are Brodix).

If you don't have the carb you may want to get a bit bigger one, a 750cfm carb will have no problem.
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Old 02-25-2013, 10:16 PM
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The heads are straight plug here have a look:








The guy is selling it as a package deal story goes he he bought all this stuff 12 years ago now and never used it. So for the past 5 years its been mounted on his garage wall as an ornament. Dont really approve of his storage methods but I went and looked at it today looks good. I will take a straight edge to it if I buy it though. Here is the rest of the stuff that comes with it:


Retail price is well over $3000 for all of it I can get for $1800 (got him down from ($2550) and sell or use the rest of the crap. That is the only reason why I am considering using these heads
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Old 02-25-2013, 10:53 PM
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you decide if it suits you then let us know.what kind of carb? edelbrock or carter?
whats worth $1800. to you?
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Old 02-25-2013, 11:05 PM
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Edelbrock 1400 - Edelbrock Performer 600 cfm carb that I would sell. I have a 650 cfm already on my truck. For me to buy those heads here alone would be over $1000 with no roller rockers. The harmonic balancer (fluidampner 712340) is priced over 500 my location ect. So you can see retail price adds up. Anyways just an option that I am considering
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Old 02-25-2013, 11:09 PM
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I would use a fluid dampr.
Not the carb. Reselling takes time and effort.
what do you want the engine to do when it is finished?
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Old 02-25-2013, 11:17 PM
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I dont mind reselling actually its fun for me. Nothing too crazy not planning on racing or anything like that. I just want a nice cruiser that I can take to work sometimes and drive on weekends but still make decent power. Also the lower octane I can run the better 383 stroker or 355 What I dont want is an obnoxious beast that will launch me from every red light like I am heading down the quarter mile.and a tame stall/stock converter
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Old 02-25-2013, 11:31 PM
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so a 9:1 383 with small hydraulic roller,380 plus HP?
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Old 02-25-2013, 11:38 PM
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Yea that sounds close, lower compression 400 hp or so 383. I plan on using my 1980 L82 4 bolt main block with a Hydraulic Flat Tappet Camshaft though not a roller too pricey and would it even work with my block? I dont know
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Old 02-26-2013, 01:38 AM
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By the time you by all the additive for your oil changes,it might be cheaper to get a roller cam
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Old 02-26-2013, 05:11 PM
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Sorry about that. I was going by Edelbrock's website that shows 60619 as a bare single head.
Edelbrock.com - Cylinder Heads - Chevy - Small Block - Performer RPM Small-Block Chevy
I should have known better because my pn 6073 heads have 6061 cast into them also. As I said earlier they are straight plugs heads, but 70cc.
I believe you'll find the actual part number on the end of the head where the accessory mounting holes are located. If they are that old they probably have the flat tappet cam springs installed.
Some here have said that you shouldn't try to do any porting on them, and that they are optimised from the factory.
I don't agree, and believe they can be improved with a little time and effort.
Again sorry about saying they were angle plugged. Just trying to help.
ssmonty
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Old 02-26-2013, 05:25 PM
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roller cams

[QUOTE=Chad.;1650620]Yea that sounds close, lower compression 400 hp or so 383. I plan on using my 1980 L82 4 bolt main block with a Hydraulic Flat Tappet Camshaft though not a roller too pricey and would it even work with my block? I dont know[/QUOTE

I was introduced to my first roller cam in the 70s

since then I see no reason to use a flat tappet cam
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Old 02-26-2013, 07:37 PM
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Just my two cents.
I haven't used a Fluidampner, but have heard a lot of people say they wouldn" use one if it was given to them. Doesn't get the job done.
I had a set of the Edelbrock valve covers, and the oil baffle for the pvc valve/breather is a joke. Gave them away along with the plastic socket head capscrew plugs they came with to make them look like a two piece cover.
I can say from experience that I wouldn't waste the energy to throw the ACCEL distributor in the dumpster. Google it.
You can use a roller cam if you buy "retrofit" roller lifters, but they're not cheap, but may be less than a ruined engine from a wiped-out lobe on a flat tappet cam which is happening all the time now. Google it.
400 HP from a 350 on 87 octane? Aint saying it can't be done. Good luck.
To make higher horse power usually means raising the rmp where the torque is made. Raising the rpm usually means a cam with long duration. That usually means raising the compression to make it run efficiently, which usually means higher octane to keep it from self destructing from detonation.
Easier to make more torque with more cubes. If you are going to buy a new crank, might as well make it a stroker for a bit more money. Check out the cost of a 350 Scat crank(3.48" stroke) vrs. a 383 Scat crank(3.75" stroke) at Summit. With a 12cc dish piston, 5.7 rods, 4.166 bore gasket .039" thick, and a zero deck, the 70cc heads would make for about 9.6:1 static comp. ratio. and a DCR of 8.0:1 with the XE268 cam. 412HP using Cam Quest software.
FWIW,
ssmonty
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