Dedicated to the Promotion and Preservation of American Muscle Cars, Dealer built Supercars and COPO cars. |
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#1
03-11-2007, 01:14 AM
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272 block...
Looking for info on how much a stock 1969 396/350hp 272 2 bolt block can be bored....I plan on sonic testing before doing any work...just wanted to get any feedback from those who have done it before....
wilma
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02 Berger 380hp #95 Lots of L78 Novas Join National Nostalgic Nova! 70 Orange Cooler 69 Camaro 
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#2
03-15-2007, 07:27 AM
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Re: 272 block...
Been doing some research on a stroker kit for the 396...Speed-o-Motive offers a pkg to put 454 crank in 396 block to get 434cid...with .30 over you get a 440 BB..power figures from different articles seem impressive...any thoughts..??
wilma
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02 Berger 380hp #95 Lots of L78 Novas Join National Nostalgic Nova! 70 Orange Cooler 69 Camaro
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#3
03-15-2007, 09:16 AM
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Re: 272 block...
.030 over seems standard. I would expect at least .060.
Jason
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#4
03-15-2007, 11:10 AM
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Re: 272 block...
You're right--The 396 is a meaty block.......060 over is no problem...
Do you have to notch the bottom of any of the cylinders for rod clearance because of the longer stroke....
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#5
03-15-2007, 05:01 PM
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Re: 272 block...
Most of the stuff I have read says clearance work is needed for the rod bolts...crank is not an issue...a lot of guys recommend limiting the overbore to .30 to minimize any potential cooling issues....this stroker idea is pretty cool...any other thoughts are welcome...
wilma 
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02 Berger 380hp #95 Lots of L78 Novas Join National Nostalgic Nova! 70 Orange Cooler 69 Camaro
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#6
03-16-2007, 08:10 PM
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Re: 272 block...
Tom,
A few members over on the NCRS site told me that the main reason for the large influx of '6223 crankshafts over the past 2 years is because of the stroker cranks for the 396 and 427 engines. All that additional power with the same bore must be appealing to the non-original crowd. I'm interested in your findings - please keep us informed. Steve
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#7
03-16-2007, 10:07 PM
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Re: 272 block...
Apparently, with no core shift, people have gotten away with .125" over. Machining heads for hardened seats sometimes hits water according to my machinist, and others. Not good. If you are using older heads, they probably have enough carbon soak that the seats will be ok anyway with unleaded gas. The extra stroke sounds interesting.
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Chevelleless after 46 years......but we did find a low mileage, six speed, silver 2005 Corvette. It will just have to do for now. 
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