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Old 04-05-2013, 11:12 PM
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383 Stroker

Hi guys, Im the new guy.I cant afford a dyno test but was wondering if any one could give me an educated guess my approx horse power.


Vortec Block bored 4.030
3.75 stroke one piece crank
Probe forged pistons
10.5 to 1 comp
Cam 236/242 @ .050 .544/.545 110 lsa Roller cam
Rhs Heads 180 cc intake 74 cc exhaust 202/ 1.6 valves
Crane 1.52 Rockers
Rpm Air Gap intake
670 Avenger
1 11/16 headman headers
MSD Ignition

Should I run a 750 Holley Mech Secondary?

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Old 04-05-2013, 11:35 PM
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Aluminum RHS heads??.
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Old 04-05-2013, 11:38 PM
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No Cast iron no detonation here
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Old 04-05-2013, 11:42 PM
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Heads were milled to 59cc and block was decked to .010 have -12cc dished pistons running me 10.5 to 1 ish
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Old 04-06-2013, 02:18 AM
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440 hp at 5700 rpm,thats a guess.What do you think?
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Old 04-06-2013, 04:30 AM
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Do think the 180cc intake runners are going to help you on the bottom/mid,but hold you back on the top end with a pretty sizable lift cam.Common place lift for a roller.

Not to second guess you,but heads with a intake runner in the range of 195 to 200cc would have moved the torque band up,but would bonus on the top end.

Your in the right ballpark with 335 duration(well close any-who)for 10.5 SCR wanting 333.

I'm not big on guessing games.More of a hard facts kind of guy.Torque wise I would think upper 4's is very doable.
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Old 04-06-2013, 11:44 PM
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Thanks for the input, this motor is spinning 6,000 RPM max, if I were doin 7 to 8 grand I would defiantly use bigger runners. I was hoping at least 425 horses
was reasonable...The other thing is Did I post incorrectly cause this post was moved from engine section
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Old 04-06-2013, 11:47 PM
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How does the thanks thing work at the right of page???? Help thanks all
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Old 04-06-2013, 11:54 PM
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Thank you for your input was hoping to get 425 horses out of it.
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Old 04-07-2013, 12:03 AM
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Thank you for the input and was planning 6,000 Rpm motor when I built it. Cam is rated to 5,800 rpm and intake and heads will handle 6,200 Rpm Red line 6,500 so lower top end is ok. Was hoping build would be at least 425 horses. Thank you Again 1GARY.
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Old 04-07-2013, 07:50 AM
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cam Vs RPM

Quote:
Originally Posted by Nemeth View Post
Thank you for the input and was planning 6,000 Rpm motor when I built it. Cam is rated to 5,800 rpm and intake and heads will handle 6,200 Rpm Red line 6,500 so lower top end is ok. Was hoping build would be at least 425 horses. Thank you Again 1GARY.
Cam manufacturers when printing information for catalogs for sbc usually use the 350 as a baseline.Your 383 will likely make the rated power a couple hundred RPM sooner.
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Old 04-07-2013, 10:58 AM
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How does the thanks thing work at the right of page???? Help thanks all
Nemeth, if you click it, it leaves a thanks to that poster for his of her input. Kind of a nice perk for someone who the OP feels has helped in some way.
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Old 04-07-2013, 11:25 AM
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head flow

Quote:
Originally Posted by Nemeth View Post
Thank you for the input and was planning 6,000 Rpm motor when I built it. Cam is rated to 5,800 rpm and intake and heads will handle 6,200 Rpm Red line 6,500 so lower top end is ok. Was hoping build would be at least 425 horses. Thank you Again 1GARY.
your heads would work great on a 327 that revved past 7k,but a 383 would likely peak under 6k. The importance is that the parts match.You have more than enough heads to make 500HP,so Im sure your goal has been met.I like the conservative combo and look forward to a video.
I see your engine as one that will be very fun to drive in a street car.should spin the tires easily
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Old 04-07-2013, 11:31 AM
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If you want (more) power the 750DP will work much better.
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Old 04-08-2013, 01:33 PM
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Quote:
Originally Posted by Nemeth View Post
Should I run a 750 Holley Mech Secondary?
Rule of thumb is vacuum secondaries with stock converter/auto. Mechanical secondaries if loose converter (~3000 stall) or manual trans.

Can run a dynosim for you is you furnish the following info....
Bore
Stroke
Rod Length
Cylinder head flow, intake and exhaust 0.100" through 0.700" or whatever the mfg or Stan Weiss site gives for range
Intake valve diameter
Exhaust valve diameter
Static compression ratio
CFM, type of induction (2-bbl, 4-bbl, TBI, TPI)
Intake manifold type, mfg (single 4-bbl, two 4-bbl, one 2-bbl, three 2-bbl, individual runner Weber, mechanical fuel injection, low-rise, high-rise, tunnel ram, dual-plane, single-plane, part no. if you have it.
Exhaust system (be specific, primary tube size if long-tube headers).
Camshaft
Part number, grind number.
Type (flat, roller, solid, hydraulic).
Intake valve lift, exhaust valve lift.
Timing info and at what tappet lift the info is valid, i.e. 0.006", 0.050", etc.
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