318 Stroker Build

pishta said
normal stroke is 3.31, your adding .69 inches so your piston is going to travel .345 inches higher in the bore. youll need pistons that are ~.345 shorter in compression height. Here are 2 pistons, one is stock, one is a stroker, see the difference? a stock piston on a stroked crank will hit the head. On a ultra low compression 318, its almost ossible to run a .060 head gasket and make it work, but it would be close and of course you'd probably pop the top compression ring.
View attachment 1715254085

Damn, did the math on a blueprint 9.60 deck block and those 399's will only be .128 out of the hole (dome only) on a 4.00 stroke crank..Really? Can someone confirm that? Skirts would be more of an issue unless the stroker crank has shorter counterweights. Bore notching for the rod nuts is a gives as even the 4.00 needed a little kiss with stock rods and a 4.00. Check your piston height with those pistons in your 318 and tell us how deep in the hole they actually sit with a caliper to the top of the dome. Interesting......
6.123 rod
1.655 stroke off cl (half of 3.31) <<WRONG STROKE>>>
1.810 compression height
0.140 dome
- 0.060 head gasket
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9.668
-9.600 deck
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+ .068 out of the gasket. if the dome fit the chamber.....Get some big cc 360 heads...