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Agree with Hev (even the Jack Daniel's bit!). This month's Mustang Monthly with the orange Boss 429 on the cover has a really great article on building a stealth 331 stroker, very interesting reading. It suggests that the 331 size is optimum for reliability than longer strokes on a 289/302. More importantly, if you're looking to make compliance easier than there is an allowance/limit of up to 15% increase in capacity increase for minor owner modifications based on the biggest engine available in your year. So with a 1966, it's a 289, 15% increase is 332, may save some extra heartache trying to get compliance. Even if you don't care, your insurance may default if it doesn't comply and you have a stack that's your fault and they investigate. Here's an extract from vsi 15:Examples of minor (owner certified) modifications are:�� Engine changes where the capacity increase is less than 15% above the maximum size engine available for thevehicle (providing no major structural modifications are necessary and where noise and/or exhaust emissionADRs apply, all standard equipment such as carburettors, exhaust systems, exhaust gas recirculating valves,oxygen sensors and catalytic convertors relating to noise and emission control are retained and operatecorrectly).Just something to think about.
Yes! But also the 68 1/2 had a 428!
Quote from: Bumblebee link=topic=2639.msg14529#msg14529Agree with Hev (even the Jack Daniel's bit!). This month's Mustang Monthly with the orange Boss 429 on the cover has a really great article on building a stealth 331 stroker, very interesting reading. It suggests that the 331 size is optimum for reliability than longer strokes on a 289/302. More importantly, if you're looking to make compliance easier than there is an allowance/limit of up to 15% increase in capacity increase for minor owner modifications based on the biggest engine available in your year. So with a 1966, it's a 289, 15% increase is 332, may save some extra heartache trying to get compliance. Even if you don't care, your insurance may default if it doesn't comply and you have a stack that's your fault and they investigate. Here's an extract from vsi 15:Examples of minor (owner certified) modifications are:�� Engine changes where the capacity increase is less than 15% above the maximum size engine available for thevehicle (providing no major structural modifications are necessary and where noise and/or exhaust emissionADRs apply, all standard equipment such as carburettors, exhaust systems, exhaust gas recirculating valves,oxygen sensors and catalytic convertors relating to noise and emission control are retained and operatecorrectly).Just something to think about.So les , in 67-68 the mustang came with a 390, so if you add 15% you can go to a 448 cube with no issues , is that correct?
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