There will be no difference in a big bore kit without head and cam mods. On average your cylinder in a stock engine will only fill to appx. 55% with air fuel mixture adding a big bore does not allow more mixture. The head and camshaft allows more air/fuel into cylinder increasing the capacity over the normal 55% which creates more power. Take this example, your parents have a 69 nova 350 @ 160 HP. Yow have a 69 Nova SS also with a 350 but @ 370 HP. Both engines are 350 same bore, same stroke. The difference is with the heads and camshaft. The heads and cam allow the same cylinder to fill more with a/f mixture to say 70%. That 20% more volume allows the engine to produce more power since it will have a greater volume of mixture. Your money will be better spent in a performance head and camshaft.
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