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Old 02-10-2013, 01:27 PM
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need help with 383 stroker build

im building a 383 stroker need some help picking out compression ratio cam and heads i wanna run afr heads forsure im also running a edelbrock pro flow xt fuel injection on this engine it has 44 lb/hr injectors rated up to 650 hp i wanna run around the 500 ft/lb to 500 hp rage the kit im getting is a cnc machined block scat rotating assembly flat top pistons if i run 65cc head ill be at 10:8:1 compression im also worried if that would be a bit high for pump gas as i wont allways run high octane fuel its going into a 71 chevelle with a 5 speed tremec manual trans and a 355 rear end use mostly for st/strip any suggestions as to what i should build this egine with cam head combo to meet my goal ?

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Old 02-10-2013, 01:43 PM
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afr 180/195 are both great choices
for a mild build I would use a mild solid roller with 560 ish lift
240 ish duration,I would use 108 square
1 3/4 competition headers
standard blue print,upgraded oil system,good pan,6qts or better
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Old 02-10-2013, 01:51 PM
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why solid over hydraulic rollor cause of valve float?
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Old 02-10-2013, 04:36 PM
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383 stroker

Vinniekg gave you some great advice on parts. I'm in the same ballpark for cam specs and heads. My only concern is that you may be pushing the limits of compression for pump gas. I usually wont exceed 10 to 1 CR if I want to use pump gas. Thats my rule of thumb, but I'm sure there are those who would disagree. Keep in mind that you'll also need to spec in a stall convertor and rear gears based on your cams power band and the purpose you built it...i.e. to run down the track...or to cruise the streets.
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Old 02-10-2013, 04:53 PM
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what snakebit said about cr
I said 108 square to be safe with higher
cr.solid rollers have more aggressive ramps
than hydraulic,,,and a little smoother idle.
hydraulic roller is my second choice,you dont give
up much power.
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Old 02-10-2013, 04:58 PM
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108 square ? not sure what you mean ?
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Old 02-10-2013, 04:59 PM
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383

Thats your LSA
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Old 02-10-2013, 05:06 PM
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ok got it now haha had a brain fart for a second
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Old 02-10-2013, 05:09 PM
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ALL valve events are measured off of the intake center line. That is the "base" event. When you see people talk about "advancing" or "retarding" their cam, that's what they're changing. It is the number of CRANK degrees that peak intake opening occurs, ATDC on the intake stroke. You change that with the timing set.

LSA is the number of CAM degrees (the # of CRANK degrees would be twice that) before the intake's peak, that the exhaust's peak occurs at BTDC on the exhaust stroke. The exhaust opens before the intake during the "standard" engine cycle (firing to firing). So increasing the LSA means opening (and closing) the exhaust EARLIER with respect to when the intake is opened. That is ground into the cam, and CANNOT be changed after the cam is manufactured (except by re-grinding).

As far as what it does IN THE REAL WORLD, a low LSA like 106 or 108 will produce more torque, but over a narrower band, and usually at a lower RPM. A larger or "wider" LSA like 112 or 114 will produce lower peak torque, but tends to spread it out over a wider RPM range; mostly upwards. Because it also tends to lower the cyl pressure at the instant when the intake opens while idling, a wide LSA also improves idle quality and produces higher vacuum, which is better for computer-controlled systems (FI).

Therefore you would tend to want a narrow LSA if you can operate the engine in a narrow RPM range and a carb, because it delivers max power under those conditions (think, mile or longer asphalt track with high banking and short straights and wide corners, or an automatic drag car with a converter near trap RPM); but a wide LSA when you want better idle quality, and/or are running EFI.

2 isn't a whole lot of difference. It's kind of subtle. 4 is enough to substantially change the personality of a cam.
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Old 02-10-2013, 05:10 PM
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i just read that off a diffrent forum and hes saying to use a wide lsa if running efi and i am running efi multiport injection with 44lb/hr injectors
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Old 02-10-2013, 05:46 PM
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383 stroker

You'll be fine with an LSA of 108. Its only when you start getting down to really tight LSA (104 - 106) That you start running into difficulty with EFI. Usually because people dont increase their injectors to higher flow. Struggles also come in because of low vacuum at idle which tend to throw the computer controls off. Cant get proper readings on air flow or O2 content. Most computers cannot be adjusted to compensate, which is why they sell aftermarket computer controlled fuel systems that can be adjusted to compensate. Carbs require no such monitoring and can easily be adjusted to compensate for LSA. Carbs are a little barbaric in some regards, but nothing replaces ease and simplicity.
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Old 02-10-2013, 07:48 PM
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cam

Quote:
Originally Posted by marvinp84 View Post
108 square ? not sure what you mean ?
108 square
108 icl and 108 separation,no advance built into the intake lobe
sorry for weak post before,I was using my posts from my phone.
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Old 02-11-2013, 07:46 AM
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Look at Airwolf heads before you go with AFR. http://www.j-performance.com/index.p...ask=view&id=48

The 220e would be a nice head and out perform the AFRs for less money. Lunati Voodoo solid roller 60132 (.578/.585, 243/249@0.050" 110LSA)with those heads will put your 383 at around 550HP. I ran the same combo in a 383 with Fuel Injection and an RPM Air Gap and it screamed. Ran on 91 OCT all day at 10.7:1.
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Old 02-11-2013, 08:05 AM
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383 build

Yes, the Airwolf 220e's are nice heads and seem to have great flow numbers, but they are a bit pricey at $2500 and if you go with titanium valves you can add another $1200 and $500 for porting. If thats in your budget then they are good heads for your build.
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Old 02-11-2013, 08:21 AM
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The Airwolf 220e is under $2K set up for a solid roller. The comparable AFR competition ported eliminator is north of $2K. I think mine were like $1795 shipped. The AFRs would also need upgrades if he wanted a solid roller and titanium valves adding to the cost. The stock Airwolfs would be great with a hydraulic roller and make serious power with room to grow for $1500.

Hell, for 500HP he could run procomp 210s for $650 a pair and hit his goal with a hydraulic flat tappet like the VooDoo 60105. Procomps do very well for the price with a quick port clean up.
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