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Old 12-01-2010, 10:40 AM
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Stroker Motor advice

I Am Building A Stroker Motor And I Am Seeking Sound Advice From A Expierienced Motor Builder

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Old 12-01-2010, 10:54 AM
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First you might want to lay out what your level of expertise is, and what it is you're working on/with, and what the expectations are for the engine.
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Old 12-01-2010, 10:58 AM
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The Block Is Is Bored .040 Over I Plan To Run Vortec Heads A Eagle Build Kit And 750cfm 4 Barrel
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Old 12-01-2010, 11:12 AM
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OK, so far, so good.

I'm going to guess you're looking at building a 385(?), using a 3.75" stroke crank.

To do this using Vortec heads (64cc combustion chambers, nominal) requires a dished piston to keep the compression ratio to a streetable level.

This is best done using a "D"-shaped dish, so the quench can be maximized, along w/"0" decking the block (or whatever combination of deck height and head gasket thickness you use to come up w/a ~0.040" piston-to-deck measurement, or quench).

You will want to use at least 5.7" rods, w/the big ends profiled for use w/a 3.75" stroke crankshaft. If you don't pay attention to this, you may find that you'll need a small base circle camshaft and/or clearancing of the block to clear the rods. This can be eliminated or at least minimized by choosing the right parts.

Vortec heads will make a lot of torque in an engine such as this, but to maximize the potential, larger intake ports and possibly larger valves could be used- along w/a larger combustion chamber to enable you to use flat top pistons instead of dished.

With me so far? If so, you might want to do a search for "383 stroker" or terms like that to review all the hundreds of threads that have been made on this subject.

Good luck.
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Old 12-01-2010, 11:25 AM
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i have the same thing, 350 .040 over, i use a scat crank and rods, and i use a -18cc D dish hyper piston from Kieth Black (KB135040), with a 64cc head you will get around 9.5-9.6:1. most times with a stroker kit the rods are already clearanced for the 350 pan rails and a regular base cirlcle cam, mine didn't require any extra machine work to the block or the rods to use the stroker 3.75 crank.

i would advise unless you are building this for a truck with a redline of 4500rpm that you go with a head with a larger runner such as 180-190cc. the vortecs have a 170cc runner and this will build a bunch of low end tq, but will limit hp greatly
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Old 12-01-2010, 12:38 PM
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WHEN I PURCHASED THE BLOCK IT CAME WITH 400 HEADS IM NOT SURE WHY WOULD IT BE BETTER TO USE THOSE I PLAN TO USE THE MOTOR FOR FIGURE 8 RACEING
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Old 12-01-2010, 01:57 PM
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I have a vortec headed 383 with a 750 cfm carb, RPM intake and have NO problems winding it to 6K rpm. Low end torque and mid range is where it shines though. I used Isky cam 201278 installed 4 advanced.
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Old 12-01-2010, 03:00 PM
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Thanks For All The Help Fellas Really Appreciate It :d
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Old 12-03-2010, 02:48 PM
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Quote:
Originally Posted by V8 Super Beetle
I have a vortec headed 383 with a 750 cfm carb, RPM intake and have NO problems winding it to 6K rpm. Low end torque and mid range is where it shines though. I used Isky cam 201278 installed 4 advanced.

i too have built two 383's with aftermarket vortec heads on them, and no it had no problem turning up to 6k, but just as you mentioned low end and midrange is where it made its power. you wouldn't be able to use a a mid-high rpm cam with those heads, that is all i was saying. if you want a good street motor or crisp throttle response the vortecs would do just fine. i would suggest the heads i used on my earlier 383's though: RHS Pro Trokers 170cc
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