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383 stroker sbc with Vortec heads

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383 stroker sbc with Vortec heads

Postby jonsjunque » Fri Sep 23, 2011 10:02 am

Considering a stroker added to a marine 350, making it a 383.

I have oem Vortec heads with 170 cc intake runners ( high rise Edelbrock intake)

This will also be with dished pistons . (18 or 22cc dish around 9ish C/R)- using pump gas

LT4 cam, 218 int./228 exh. with .492 lift w 1.5 rockers

Will this combination be rev limited by the intake runner volume or will it rev to 54-5500?

john
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Re: 383 stroker sbc with Vortec heads

Postby ap72 » Fri Sep 23, 2011 10:33 am

It will rev well past that, but it should make good power up to that point. I'd look into a valve job and some bowl work if you have the money, it can really pick up a lot when compared to the way they left the factory.
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Re: 383 stroker sbc with Vortec heads

Postby ProPower engines » Fri Sep 23, 2011 11:25 am

If you are going to order rods and pistions anyway go with a 6" rod instead of a 5.7. The engine with a limited head will run much better and the end cost is the same. I do quite a lot of them here using that same combo with great results.
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Re: 383 stroker sbc with Vortec heads

Postby jake700r » Fri Sep 23, 2011 12:05 pm

the oem vortec head is limited to roughly .460-.480 lift without machine work if im not mistaken
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Re: 383 stroker sbc with Vortec heads

Postby CNC BLOCKS » Sat Sep 24, 2011 7:30 am

A few years ago we built an 383 for a 55 chevy and used the 906 castings with just a good valve job and used a bowl hawg on the dyno it made 449 horse and 488 torque!!!
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Re: 383 stroker sbc with Vortec heads

Postby jonsjunque » Sat Sep 24, 2011 11:24 am

Can someone explain "bowl work".

Maybe some pics?

Thanks, John

( Yes, stock springs lift- .460/.480 noted)
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Re: 383 stroker sbc with Vortec heads

Postby jonsjunque » Sat Sep 24, 2011 1:00 pm

ok , found an article from February 2009 -Popular Hot Rodding on bowl work
0602phr_12_intake_valves_z.jpg


(got sidetracked by Grace Potter music video! ooh la la)

Looks like some grinding work to remove sharp edges and such from factory work, and also smoothing of ports.

john
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