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Destroking a 350 NEW HERE PLEASE HELP!
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jtb0322
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Joined: 29 Jan 2012
Posts: 27

1131.62 points



PostPosted: Wed Feb 01, 2012 7:28 pm    Post subject: Reply with quote

Thanks for all the help guys and no we are not allowed to run the 305 vortec. We are very competitive in this class but there are a few people that obviously have more power than I do and are suppositively legal? I just need a little bit more power out of the 305 or I need to build a different motor combination. I have 2 months till we start racing and we need to make something happen. I am really considering this 311 build. Does anyone know if it will make any more horsepower in the 4000-6500 rpm range compared to the 305? Also, can someone give me a rough price for the machine shop work; decking the block, assembly, and balancing?

Thanks!!
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Big Dave
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Joined: 04 Dec 2005
Posts: 2644
Location: Tampa Florida
119910.22 points



PostPosted: Fri Feb 03, 2012 8:50 pm    Post subject: Reply with quote

$450 to $700 depending upon what you have done per motor in my neck of the woods. Your labor rates may vary but Central Florida is a low wage/low cost of living with no tax base area.

As to a 305 it has a 350 crank so it will stay together in that RPM range without buying a lot of expensive parts. I would say you are wasting your time above 5500 RPM because this is a high torque motor not a high horse motor. (it is a dog of a high horse motor lacking everything that makes the SBC what it could be). I would strive to maximize the torque with a longer arm and higher compression pistons and a bigger LSA number instead of a shorter one that you would normally select if you where looking for peak horsepower numbers.

Instead look to increase the area under the torque curve to build more useable average horsepower instead of shooting for peak horse numbers (try looking at a mud puller, or truck RV cam, or a marine cam instead of the drag race pages.

Big Dave
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75camaro
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Joined: 01 Nov 2012
Posts: 5

259.54 points


1975 Chevrolet Camaro

PostPosted: Thu Nov 01, 2012 11:33 am    Post subject: Reply with quote

i have 416 heads on my 360 there really restrictive and starve my motor ive been thinking my boat needs new anchors thts just my opinion from experience with them
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