borisdookie7

i was looking around on summitracing and there is a bunch of different sizes, the bore is 3in, stroke is 4in. and rod length is 5.4in right?i just want to make sure. thanks

jtmustang

stock bore is 4.00 stock stroke is 3.00 and stock rod is 5.090 for 302

tinman

+1, yeppers........

borisdookie7

thanks, so if i wanted to use this crank
http://store.summitracing.com/partde...p;autoview=sku
do i have to get different rods? it says 5.4inch rods but would i have to get lesser comp pistons? and when it asks about pistons if its -cc that means it has less comp. right? sorry for all the questions

my77stang

thats a stroker crank, you need the proper rods and pistons to make that combination work and you would end up with a 347.

borisdookie7

hmm ok thanks, so i need to get 5.4" rods, how would i measure my clearance? i want a higher comp engine, 11-12.1? on imports it was way simpler lol the pistons were just labelled as 11:1 comp and that was it, but the whole -cc thing confuses me

borisdookie7

i think i get the pistons a bit now, so the more -cc it is the higher the comp is going to be right? but the rod thing confuses me, if i used the stock rods and just got higher comp pistons wouldnt i have more displacement but less comp? would i make more power that way or less displacement and higher comp? please let me know if something i say doesnt make sense lol

HYPEracing

-cc pistons are dished out, the number of -cc's is how many cubic centimeters it is "dished" out. pop ups, or domes pistons give you more compression. Just make sure you get a piston that has proper clearance so the valves dont hit them.

HYPEracing

the reason imports are like that is because the heads rarely are changed, and if they are typically the combustion chambers stay the same size. there are so many different size combustion chambers out there, that they cant just sell a piston as 11.1:1. it may be that way in one motor with a 64cc combustion chamber, but with a 76 cc chamber that would be more like a 10.5:1 ratio depending on the bore.

borisdookie7

ok thanks, is there a tool im supposed to use to check? or use dough or something lol i think i heard of that before, and do you know about the rods i was asking about?