SBC info - v8 Miata Forum - Home of the v8 Miata Conversion

mx5.7 · 2010-03-05 23:40:33

I got this in a private message today and thought that others might benefit from the info. I have had the same questions asked a lot on m.net private messages. Did you use the BossFrog kit to swap in your motor? If so what changes did you have to make other than the headers and the T56 adapter.....Any help will be appreciated. I'm using a 383 stroker..Dart block, edlebrock alum heads and all the usual goodies. The only part of my car that I used a kit on was the rear end from www.monstermiata.com I have been to boss frogs shop and don't know why their subframe wouldn't work. Personally I would order it without motor mounts, and mount the engine myself. I got my T56 off an LS1 car and bought the adapter spacer from http://www.mcleodracing.com/ More on my build at http://www.cardomain.com/ride/680654

03-10-2010, 06:46 PM

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mx5.7

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Quote:

Originally Posted by irishvol

Thanks for your response. I hope you don't mind me picking your brain during my conversion. Boss Frog really can't help that much because they're into the LS so much. I'm assuming the LT and LS motor mounts are different. Is the mounting position the same or will I have to rework the Boss stuff. How about the starter and the alternator? I'm using a carberator...will it clear the hood? I hope I'm not being a pain ut I've learned over the years that thereis no substitute for experience. I hope I can avoid unnecessiary waste of time, money and pain by benefiting from your experience. Thanks, Judge Tony

Yes the motor mounts are different. I don't know if the mounting position is the same. The further back you mount it the more hood clearence you will have. A freind of mine got his under a stock hood (cut out the hood webbing) by using ram horn manifolds and lowering his K frame 1". The height of the intake will make a big difference also. I made my own alternator brackets and mounted it on the drivers side down low. I used a gear reduction mini starter. Lets discuss this for everyone to see so I don't get so many repeat questions.

Keep the questions coming and I'll do my best at answering them.

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