+4mm stroker crank

[Ready2rev]

i am getting a 240 big bore kit soon and was wondering if i throw in a 4mm crank do i have to get ports to match the stroker?

 

[blasterdude14]

you dont neccesarily have to match it, but it would be best to match it to get the best performance out of it

 

[Ready2rev]

so it would be okay to run it then. the piston and rings wont catch on ports when the stroke is raised?

 

[blasterdude14]

i am not exactly sure on that i imagine that it wouldnt catch on anything but im not sure

 

[ron89]

your best bet would be to get a 3 mill and have your ports matched for that, its a pain from what i hear getting them right for the 4mm. i think mine ill be running no base gasket just to make it right..

 

[Ready2rev]

and raising the stroke i will need to have the head milled right?

 

[stephen12091985]

i think with a +4 you might have to get ur cases ported

 

[xmous3yx]

for a +4 u need to have ur cases trenched and ur head milled.

 

[Ready2rev]

so would sanding the cases make it fit?

 

[1997blaster]

so would sanding the cases make it fit?

mabe if your tweakin on crack it may be possible I:I lol but sending it to your engine builder would be your best bet

 

[Ready2rev]

would there be much power difference between 3mm and 4mm?

 

[stephen12091985]

for a +4 u need to have ur cases trenched and ur head milled.

thats what i was goin for couldnt think of it

 

[xmous3yx]

would there be much power difference between 3mm and 4mm?

well considering that ur only stroking in small mm's. yes there would be a difference. i believe a 25% or more increase in power.

 

[CHutzell]

the +4 you will need to trench your cases and have the cases bored so the piston clears at BDC,some stock bore engines will clear but with a big bore its a must to have them bored also.Thats probibly why no one likes the +4s,they are "to much work"

 

[burnin'_oil_2001]

if you do not use a spacer then you will have to have your head machined for the stroke, this also the case with long-rod kits. i have spoken with a few builders about which is best +3,+4, or +6 and they said that it depends. they all agreed that the +3 is by far the easiest (read: least expensive) to make work. they also had differing opinions on using spacers for the blaster- on a banshee they said it is a no no... but some felt that the blaster did not need the head milled for the stroker as the spacer provided enough room to adjust the port timing. the best thing to do is talk with the person who is going to do your engine work.

 

[ron89]

i dont think they sell a spacer plate for the 4mill.. you need to get the head cut and trench the case and get it ported for the longer stroke.. yea i guess who installed my 4mill didnt know he had to mill the case so the piston wouldnt hit on bdc. so now i gotta get my piston skirt milled down yay lol..