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Old 02-22-2006, 04:56 PM
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Need advice on 383 stroker project

Okay I am looking into dropping a carbed stroked 350 sbc into a 86.5-92 MK3 Supra. What I need advice on mostly is carb/cam/head selection and also what sort of 5 speed transmission will hold up to around 350-400rwhp. I am not planning to heavily drag race this car, though having the option on a nice weekend evening would be great. At the moment I have NONE of the parts that I will need. When all is said and done, I will have around 7000 to spend on the motor/transmission. This is just the parts budget, I already have fabrication money set aside.

Now, this 7000 needs to cover EVERYTHING. I have considered a crate motor, but then I have to pay an unquantifiable fee for them to assemble it for me. Power goals for the motor are somewhere between 350 and 400 horsepower at the rear wheels. I am familiar with engine dis/assembly and some higher end things like degreeing a camshaft, so all I'm really looking for here is a good, cost effective combination. Also, what sort of gas mileage can I expect from a mid-cammed 383 in a 3600 lb (with engine/trans) car with 3.73 gears and ?? 5 speed transmission? I am guessing somewhere between 12 and 15, but as long as I can squeeze double digits out of it, it will suffice.

The one thing I know absolutely nothing about is carbs. I understand CFM rates but basic carb tuning/maintanence knowledge has eluded me. One of my roommates has a 350+ HP 78 mustang and claims to know about carbs, but he hasn't got that thing running right in the 2 years he's had the motor in it, so I'm not sure I want to talk to him.

Thanks in advance all!
-383MK3 (soon)

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Old 02-22-2006, 05:43 PM
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Here is a combination that I would consider.

Long block: From http://www.revolutionaryperformance....g%20blocks.htm

Street/Strip Stroker AFR Upgrade SBC 383 4 bolt main block, Eagle cast steel 3.75" crank, Eagle SIR 5.7" rods, KB Performance or Sealed Power hypereutectic 9.6:1 pistons, Sealed Power rings, solid or hydraulic flat tappet cam, double roller timing set, new balancer and flexplate, pushrods, Air Flow Research 195cc heads, HP springs, locks, and seals, aluminum race series 1.6 rocker arms standard $4,150. add hyd roller cam $400 = $4550.

Intake: Performer RPM air gap $204

Carb: 750 cfm speed demon $440

ignition: GMPP HEI $180

This is not every piece of the motor, but it is close. This adds up to $5400. You would still have to pay for shipping, and having the rest of the motor put together but I think you could still get the whole thing done for $7000. These are not the strongest parts money can buy, but they are way better than stock, and as long as you dont throw a bunch of nitrous at it, it should hold up just fine. The max RPM should be around 6000 so that shouldn't stress the parts too bad. The cam price is figured into the short block, but as far as which cam to go with, I would recommend the Comp XR288HR (236 242 @.050 duration .520 .540 lift) cam. This motor should start making great power around 23-2500 RPM and pull to around 6000. As far as hp numbers, you would be looking at around 500hp 500tq. I would recommend going with around 10:1 or 10.5:1 rather than 9.5:1 suggested in the long block. If you assume a 15% loss to the rear wheels through a 5 speed, you would be looking at around 425 at the rear wheels. this motor would have a little rock to it, but nothing really radical. I have a friend with the same combination, just different heads (200cc iron pro topline) and I am not sure what he gets for mileage. He has 4.10 gears and a 700R4 overdrive tranny in a 3500 lb 1984 camaro. I will ask him. As far as which tranny, I would recommend the one below.

Richmond 5 speed:

This is essentially the motor I recommended with a larger solid roller cam

This one has the AFR 190cc heads and a cam almost exactly the same as the one I recommended. The 190's are pretty much the same thing as the 195's. So much so that they stopped selling the 190s and now sell the 195's only in this size range.

Look here at the first 500 hp 383. This one has the same cam I recommended.

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Old 02-23-2006, 12:20 PM
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I talked to my friend and he said that he actually gets around 15-18 mpg on the interstate. Thats better than I thought it was.

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Old 02-23-2006, 12:38 PM
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For a tranny I would think about a 700-r4 if I were you and get it built with a manual shift kit. A 4 speed is plenty for the torque band your 383 will have and you can usually build those trannies to take more for less money. I would also recomend a 2200 stall converter for street duty.
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