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Old 02-26-2013, 07:18 PM
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Originally Posted by Chad. View Post
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.
If the heads are 12 years old I don't think they will be the same part# you have listed there. The older heads only have a 4 digit part#. I just ran into the same thing on a used 383 I just bought. It has edelbrock performer rpm heads on it so I assumed it was the 5 digit part# heads only to realize they were the older style. When I called edelbrock to inquire (because I couldn't find much on the net in regards to the 4 digit part# heads). I gave him my part # (6089) and he told me they made a 170cc and a 185 cc runner under the same part #. He said I could tell what I had by looking at the exhaust ports. He said if they are oval port they are 170's and if they are D port they are 185's. Thankfully they are 185's as 170 are a little small for a 383 for what I want to do with the car.

Somthing to consider. Hope it helps.

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Old 02-26-2013, 07:38 PM
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roller cam and 9.2:cr will make 400 plus horse power if you use dart shp or better heads. I would run that on 87/89.I would not expect that power from a flat tappet hydraulic.
Maybe someone else would do it or try,,,?
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Old 02-26-2013, 09:36 PM
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Yes the casting # is 6061. I called Edelbrock the best he could tell me is they are either 64cc or 70cc Performer RPM heads. Wondering why they just didnt put model #s on them. Didnt mention anything about runner size but for what I want it to do I think 170cc Intake runner would be just fine. As for the fluidampr I will just sell it. Thanks ssmonty I narrowed it down to a low compression 383 stroker at least, and that combo looks pretty good for what I want the engine to be. Can a 9.5 compression ratio still run 87 octane? I read somewhere it has to be 9.1 or less. Yea I know I am cheap lol
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Old 02-26-2013, 10:11 PM
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A 350 roller cam engine will make more power than a 383 flat tappet motor if funds are an issue.400 hp if the heads flow enough and 87/89 friendly
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Old 02-26-2013, 10:42 PM
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Originally Posted by Chad. View Post
Yes the casting # is 6061. I called Edelbrock the best he could tell me is they are either 64cc or 70cc Performer RPM heads. Wondering why they just didnt put model #s on them. Didnt mention anything about runner size but for what I want it to do I think 170cc Intake runner would be just fine. As for the fluidampr I will just sell it. Thanks ssmonty I narrowed it down to a low compression 383 stroker at least, and that combo looks pretty good for what I want the engine to be. Can a 9.5 compression ratio still run 87 octane? I read somewhere it has to be 9.1 or less. Yea I know I am cheap lol
There will be a part# on the front and back side of the head. If you give that number to edelbrock they should be able to tell you exactly what you have.
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Old 02-27-2013, 04:14 PM
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"Can a 9.5 compression ratio still run 87 octane?"
I know its possible. Todays FI cars do it. Every engine is different. Lots of variables. From what I've read a tight squish(distance between flat portion of piston and flat part of head)(.035"-.045") is one of the most important factors in reducing the chance of detonation by increasing the turbulence in the chamber, but then thats just what Ive read and have no 1st hand proof.
One of the most influential is inlet air temp. Cold air induction is a big plus. I know that from experiance.
Rear gearing is another major factor. The higher the engine load the more likely it will detonate. A tall gear like a 3.08:1 is more engine load than a low 4.11:1. Sharp edges in the combustion chamber/piston crown will get hot enough to cause pre-ignition and/or detonation. The lower the rpm the more time unburned mixture is expossed to more heat/pressure/load that can induce detonation. Oil getting past the guides/rings and into the chamber can cause detonation. A lean AF ratio is another.
I think that if you polish the chambers/piston crowns/valve edges(exhaust anyway), use a quality ignition system, correct air/fuel ratio and no oil, cool air, and a tight squish that you can use 87 octane with aluminum heads at 9.5:1CR, but thats just my opinion. Your location and ambeint air temps/fuel quality as well as what I mentioned and other factors I haven't all play a part.
I usually run 91 octane on my carbed iron head 350 with about 9:1CR and sometimes have detonation after heat soaking on a hot day.
Maybe someone else can chime in?
Good luck,
ssmonty
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Old 03-01-2013, 10:59 PM
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So I bought the packaged sale. The heads are Edelbrock Performer Rpm 70cc straight plug, square exhaust port. There is no model # stamped anywhere just a casting code 6061. Guess thats how Edelbrock did it back in 1994. Might be useful info for someone down the road. Does anyone recognize this brand of roller rocker?










This site has been really useful learned alot. I pretty much have my engine planned out. 2 things left though Roller cam or flat tappet and which rotating assembly?
From what I have been reading a Scat cast crank and hypereutectic dished pistons to keep compression down sounds good. The build so far:

Edlebrock rpm performer heads 70cc Combustion Chambers, 170cc Intake Ports

-Xtreme Energy XE268H, Hydraulic Flat Tappet Camshaft Lift: .477''/.480'' Duration: 268/280 or roller cam not sure yet.

-Edelbrock 1806, 650 CFM Carb

-1 5/8 hedman long tube headers

-Performer intake

-1980 l82 corvette 4 bolt main block

Thinking about switching to roller cam after reading about wiped cam lobes and break in procedure. Anyone know what the XE268H equivalent of a roller cam would be?
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Old 03-01-2013, 11:12 PM
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use a 750 cfm carb
and roller that is better,not the same
something like
110885-10 NA 278 278 225 225 .525 .525 110 106 Hyd. Hyd. 1,2
2000-5800 Fair idle, Street high performance. 2200+ stall, aftermarket intake, headers.
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