Question About My 383 Build.

89iroc383

Member
I have a few questions the 383 we are building is a fully forged motor technical a 388 ci it has a lpe219 cam, 1.6 roller rockers, a set of aluminum Corvette heads fully ported and polished, 1st performance intake, it is around 9.5 compression it will be tuned with a holley efi hp system, 36 lb injectors, 255 lph fuel pump going in a 89 iroc it has a fully worked 700r4 2600 stall convertor 3.27s gears I'm wondering what type of hp it will produce and possible ETs it will run..I posted the head flow chart and cam specs..any help would be great thanks..
 

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First...You are going to need a LONG rope, There are numerous RABBIT holes on this site, that will take days and weeks to go through. You would be well advised to explore them. :)
 
your combo is basically well-matched, in fact better matched than many I see,
the corvette heads are a bit restrictive compared to some aftermarket options,
I would be guessing, and expecting too see,
about high to mid 12 second et and about 420-440 flywheel, hp seems reachable
now you could get it tuned to be a bit faster but on most of the 1989 gen camaros the exhaust is rather restrictive

perhaps RICK can do a desktop software dyno calc
 
The exhaust is made up of edelbrock headers 1-5/8 I do however have a set of original slp 1-3/4 headers the y-pipe is custom made 2.5 inch into a 3 inch high flow cat into a mufflex 4.5 inch exhaust the car is being tuned with a holley HP efi stand alone system. 36 lb injectors and 255lph pump
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I'm getting a little ahead of myself. The more info you can provide below the closer
the calcs will be. A few things are not critical, such as the head gasket bore.

Bore & Stroke:
Displacement: cubic inches
Rod Length:
Heads Make/Model with flow numbers:
Combustion Chamber Size in CC’s:
Dome Volume:
Valve Reliefs Volume:
Deck Clearance:
Head Gasket Bore:
Head Gasket Thickness:
Valve Sizes I/E:
Intake Manifold Model Type: [Single or Dual Plane]
Model #:
Carburetor Size or EFI (CFM):
Blower/Turbo Make/Model #:
Belt Ratio:
SCR & DCR: Or the info to calculate SCR & DCR [ http://garage.grumpysperformance.co...comp-ratio-cranking-pressure-calculator.4458/ ]
Header Tube Diameter: (1-5/8", or , or)
Rocker Ratio, Intake/Exhaust:
Fuel Used: Gasoline, Methanol, Ethanol, E85 .....
 
4.06x3.75
388 ci
Heads are 113 aluminum Corvette heads flow sheet attached above 58cc heads
Head gasket thickness I think was .034
Valve size 2.00 x 1.60
1st performance intake 71mm TB 835 cfm
Headers are 1-5/8
Rockers are 1.6 roller
93 octane
Pistons are 4 relief dish type
Cam is a lpe219 cam specs are attached above .
 
Good question it's a tpi intake style not sure if its single or dual plane.
 

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Id try single plane as all the runners share a common plenum and are roughly the same length
 
I don't have a choice for TPI or MultiPort, so I assumed it's a single plane intake manifold.
I also assumed the 835 flow number is at 1.5 inHg and the head flow is at 28 inH2O.
I used Ported Values for the head flow numbers.

I would invite you to read thru the report attached and make sure the numbers I'm using are correct.

Sim01_LPE219Cam.jpg
 

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The simulation above is done with open headers.

Especially fun at the "Tail of the Dragon" ! I'm going there next summer 2020 with my TBucket.

 
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