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Old 09-23-2013, 11:42 PM
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Questions about heads for 383 stroker

I am a rookie when it comes to putting an engine together. I have a 350 sbc (already .030 over, 3.75 crank) looking to make a 383 stroker dirt track engine. I have a set of World Products S/R I-052 heads. The guy I got the WP heads from had them on a 307. Am I wasting my time even contemplating putting them on a 383?

Intake Runners: 170cc Port Dimension: 1.940” x 1.170"
Exhaust Runners: 65cc Port Dimension: 1.345” x 1.370”
Intake Valves: 1.940”
Exh. Valves: 1.500”
Combustion Chamber Volume: 67cc
5.565 rods
Not sure on pistons, they are dome tops out of another 383 but only number on them is 3502??? I am guessing -3.00cc or so

http://www.worldcastings.com/product...f_file-287.pdf

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Last edited by LandonTexas; 09-24-2013 at 12:04 AM.
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Old 09-24-2013, 12:23 AM
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That's a small head, and at 67 cc, assuming the piston is .025 in the hole, you're looking at 11.04:2 c.r., if the dome is actually only 3 cc. If the block has been decked, piston at zero deck, you will have 11.76:1, and that's with a thick .041 gasket. Too much for pump gas.
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Old 09-24-2013, 04:06 AM
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I guess it depends on the application?heads are small,CR is high.If its a street engine,then tuning will be almost impossible while make low HP.If its a race engine with race gas,it wont make much power due to low head flow.
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Old 09-24-2013, 06:44 AM
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Quote:
Originally Posted by LandonTexas View Post
I am a rookie when it comes to putting an engine together. I have a 350 sbc (already .030 over, 3.75 crank) looking to make a 383 stroker dirt track engine. I have a set of World Products S/R I-052 heads. The guy I got the WP heads from had them on a 307. Am I wasting my time even contemplating putting them on a 383?

Intake Runners: 170cc Port Dimension: 1.940” x 1.170"
Exhaust Runners: 65cc Port Dimension: 1.345” x 1.370”
Intake Valves: 1.940”
Exh. Valves: 1.500”
Combustion Chamber Volume: 67cc
5.565 rods
Not sure on pistons, they are dome tops out of another 383 but only number on them is 3502??? I am guessing -3.00cc or so

http://www.worldcastings.com/product...f_file-287.pdf

Thanks!!!
Quote:
Originally Posted by vinniekq2 View Post
I guess it depends on the application?heads are small,CR is high.If its a street engine,then tuning will be almost impossible while make low HP.If its a race engine with race gas,it wont make much power due to low head flow.
Vinnie-he said he wants a dirt track engine...
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Old 09-24-2013, 07:05 AM
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what power goal and rpm? those will really start to choke it after 5,000rpm. The compression is high but that may not be a big deal if you're running race fuel or E85, I know a lot of tracks are allowing E85 now.
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Old 09-24-2013, 10:24 AM
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I would be running race gas. As for the rpm range, I have never been on the track, but would think somewhere around 5,500. I also have a stock 3.48 crank. Would it still fall off after 5,000rpm with the shorter stroke?
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Old 09-24-2013, 10:33 AM
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when the engine reaches peak power is dependent on cam profile and head flow
how many horses are required to be competitive?
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Old 09-24-2013, 10:46 AM
How fast is fast enough?
 
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Quote:
Originally Posted by LandonTexas View Post
I would be running race gas. As for the rpm range, I have never been on the track, but would think somewhere around 5,500. I also have a stock 3.48 crank. Would it still fall off after 5,000rpm with the shorter stroke?
5500 rpm will be fine with the 3.75" stroke, at the edge but if that's your peak rpm then you'll be fine. The cam factors in as well.

I'd run em, and consider running E85 over race fuel- MUCH cheaper if you'll be running it often.

Since your rpm is low I'd build a hydraulic roller motor too, even though its a race engine, keep it low maintenance so you can spend more time racing and less time working on it.

a 383 with those heads and the rest of a good mild race engine build should be able to get around 450hp without making it a maintenance nightmare.
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Old 09-24-2013, 11:39 AM
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I am not sure about the average hp at the track. When I bought the car it came with a (cracked) .040 over 307 with the WP heads, stock crank, hydraulic flat tappet lifters, unknown cam, roller rockers 1.5:1, dished but unknown cc pistons, and 5.703 rods. He said he was usually top 5 with it. Keeping an eye out for a 307 block to build a backup engine.

I think 450 hp will be sufficient with the 383. I will check out the E85.
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Old 09-24-2013, 11:48 AM
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450 hp race engine? I would use a 327.
for a 307,you can also use a 283 block.
for a solid 450 horse power,any head that flows 250 cfm into your bore size will do.
What are the engine rules at the track?usually there is a restriction or many restrictions
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Old 09-24-2013, 11:59 AM
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Engine Specifications

1. Any American make engine allowed

2. Steel heads and block only

3. 23 degree steel heads only

4. No dual point distributors

5. All engines must be able to be used in conventional passenger car without alteration

6. Engine mounts cannot be remove or altered

7. Castings and fittings must not be changed

8. No machine work on outside of engine

9. “Wet” oiling system only

10. No titanium, magnesium, or carbon fiber products except for valve retainers
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Old 09-24-2013, 12:02 PM
How fast is fast enough?
 
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450 hp race engine? I would use a 327.
Why? I can't see a benefit in it, maybe I'm overlooking something?
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Old 09-24-2013, 12:22 PM
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"23 degree steel heads only"
your search begins here

AP72 many configurations offer different advantages in different situations.

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Old 09-24-2013, 12:36 PM
How fast is fast enough?
 
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Quote:
Originally Posted by vinniekq2 View Post
"23 degree steel heads only"
your search begins here

AP72 many configurations offer different advantages in different situations.

12000 rpm nova at it again! - YouTube
450hp... no need to reinvent the wheel. He could make 450hp with a cheap 350 running on 87 octane.

Advantage- less money and time in the engine, more in actual racing.

Run what you have and have fun, if he had a 327 sure go for it, but if he has a 383, all the better.
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Old 09-24-2013, 03:16 PM
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I'd run those heads on a 283, but not a 383.
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