Ol 383 back on the rollers. - Page 3 - LS1TECH - Camaro and Firebird Forum Discussion

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Ol 383 back on the rollers.

Old 11-21-2018, 11:26 AM
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Looks like Mast has a little side hustle going with their unported heads...
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Old 11-21-2018, 11:39 AM
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Originally Posted by Chris25 View Post
Thats not a bad price at all be interesting to see how they perform.
theyd do well on a 383 plus you get to use ls3 intakes which flow a lot better than most cathedrals.
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Old 11-21-2018, 11:39 AM
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Looks like a good deal, are they available in the US or exclusive to PW?
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Old 11-21-2018, 11:40 AM
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Originally Posted by G Atsma View Post
Looks like Mast has a little side hustle going with their unported heads...

i have a buddy running 7.40’s @ 185 with PW 225cc cathedrals lol

the mast versions do flow a lot more though. But of course for more money
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Old 11-21-2018, 11:41 AM
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Originally Posted by NAVYBLUE210 View Post
Looks like a good deal, are they available in the US or exclusive to PW?
im not sure why they wouldn’t be available in the US
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Old 11-21-2018, 02:19 PM
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Originally Posted by big hammer View Post
These are neat. They’re basically mast castings but not cnc’d. I think would be great on a 383

http://www.performance-world.com/Cyl...s-p/63240a.htm
With a port a bit smaller than stock LS3, I would bet it would even improve a stock displacement LS3 because of more flow velocity, improving the low end a bit.
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Old 11-21-2018, 03:46 PM
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Originally Posted by G Atsma View Post
With a port a bit smaller than stock LS3, I would bet it would even improve a stock displacement LS3 because of more flow velocity, improving the low end a bit.
ls3 heads were developed for engines
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Old 11-21-2018, 04:03 PM
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Originally Posted by big hammer View Post


ls3 heads were developed for engines
Obviously.....
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Old 11-21-2018, 08:05 PM
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So say I went out & spent a couple grand & got a whole new top end for my engine. Same compression & custom cam spec'd very close to this one but for LS3 heads. Around same overlap. What power would it make then & at what rpm?
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Old 11-21-2018, 09:04 PM
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That would be dumb. That heap needs other stuff way more important than more head and more cam. It would net you next to nothing as far as acceleration goes.
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Old 11-21-2018, 09:21 PM
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Originally Posted by big hammer View Post


theyd do well on a 383 plus you get to use ls3 intakes which flow a lot better than most cathedrals.
You think the rod mod ls3 would outflow a cathedral fast102?
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Old 11-21-2018, 09:35 PM
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Originally Posted by HioSSilver View Post
That would be dumb. That heap needs other stuff way more important than more head and more cam. It would net you next to nothing as far as acceleration goes.
So which one better dyno numbers?
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Old 11-21-2018, 10:02 PM
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Originally Posted by Chris25 View Post
You think the rod mod ls3 would outflow a cathedral fast102?
i believe it does yes. By a margin
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Old 11-21-2018, 10:03 PM
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Originally Posted by SoFla01SSLookinstok View Post
So say I went out & spent a couple grand & got a whole new top end for my engine. Same compression & custom cam spec'd very close to this one but for LS3 heads. Around same overlap. What power would it make then & at what rpm?
let’s find out!
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Old 11-21-2018, 10:25 PM
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Nice job Rick. He already knows a Mamo MSD with a bigger tb would be kickass but he said it might not clear the cowl on his car. Plus upgrading the intake track with a Dougy box/Pro stock MAF,bigger MAF.... but who cares about dyno numbers. I think the heads and cam are fine. Is there an Improved racing scraper for that block? That would help since that car makes it's shifts north of 7000. Make the car lighter(he has heavy wheels,suspension,full size battery) and with more gear it would really freaking fly in the 1/4 mile but that is not what this car is about...

Oh yeah, You know the bitching is coming..........E85!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!
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Old 11-30-2018, 03:03 PM
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Thanks Mike.

So just for fun I got the graph scaled on the 50hp as we usually do. Just to show the power does not drop as hard as the other graph skews. Actually my car's power does not seem to fall off at all up top. As I've noticed on a race vid. Where I expect to see my car fall off say after 6500rpm to 7100. It seems to pull strong, the strongest, up top until I shift.

I figured one thing that may have something to do with how it pulls like that & doesn't fall off as the power scale would imply. If you multiply the hp by the rpm it is at you get a number. My number peaking around 500rwhp at 6600rpm. The number is 3.3mil. Now multiplying anything after that all the way to 7200 rpm the number is right around the same 3.3mil. Is this a way to tell basically if it is an advantage or disadvantage to keep revving. Say if the number started getting below the 3.3mil that is when you will start to see the drop in performance?

Oh and the SAE number dropped 12hp to 492.
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Old 11-30-2018, 03:08 PM
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Who uses SAE anyways
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Old 11-30-2018, 03:27 PM
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Right? Not many anymore lol.
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Old 12-07-2018, 01:41 AM
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Rick to answer your question, look at your torque curve and multiply by your gear ratios.

Look at torque at x RPM in first gear times first gear ratio. Then look at RPM where you land in second gear. Multiply that torque by second gear ratio. If total first gear torque is still higher than total second gear torque, you should stay in first.

With your power peaking at 6600, your shift point may be as high as 7600 rpm, land right on 5200, and ride the power curve.

There are people with your power curve who would shift at 6600 and lose 1000 ft lbs of actual rear tire torque on the upshift by the time you factor in transmission and rear gear ratios.
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Old 12-08-2018, 12:32 AM
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Originally Posted by Darth_V8r View Post
Rick to answer your question, look at your torque curve and multiply by your gear ratios.

Look at torque at x RPM in first gear times first gear ratio. Then look at RPM where you land in second gear. Multiply that torque by second gear ratio. If total first gear torque is still higher than total second gear torque, you should stay in first.

With your power peaking at 6600, your shift point may be as high as 7600 rpm, land right on 5200, and ride the power curve.

There are people with your power curve who would shift at 6600 and lose 1000 ft lbs of actual rear tire torque on the upshift by the time you factor in transmission and rear gear ratios.
Hey thanks for the reply Darth. Sometimes I get the calc. out. Lol. I'll go ahead & check out the tq x gear ratio as you said. See what we come up with.
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