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Will they bolt up?

I searched and i can't find but one running this setup making high hp also probebley using custom one's but i'm not sure...

will i run into any valve clearence issues???

 
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it's a different bore size..

 
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perhaps you understod my post wrong...

i'm fitting K24's with the same 87mm bore that the K24 has, but i am not using a K20 head, i'm using a reguler k24 head.

the problem seems to be that every aftermarket piston for the k24 is made for the k24/k20 hybrid...

it will bolt, but i'm concerned about the valve to piston clearence...

 
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well are the pistons NA or turbo?
i believe i remember reading that the k24 has more deck clearance and a longer stroke so if ur getting pistons made for a frank ur comp ratio is gona be lower

 
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a frank is a hybrid k24/k20 setup, my engine is a reguler k24(i'm atempting to be non-franked) lol

i'm using my stock head, but i'm wondering weather it should sit safley in the block without valve hittin the pistons

i'm going after low compression pistons

 
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So from the sounds of it, your just going to be replacing the pistons?

 
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thats what im saying. the hybrid (k20/k24) pistons are made for exactly that. the k20a2 head has less deck clearance so to answer you question (to the extent of my knowledge) valve clearance is not an issue. the stock k24a1 has a longer stroke and more deck clearance which would give u a lower comp ratio if ur gona use frank pistons.

turbo pistons are lower comp ratio and are dished. id say just call the place you wana buy the pistons from and ask away

 
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sigh...no i didnt misunderstand your post. Im buidling a K24 frank for a friend of mine. YES, k24 blocks are 87mm bores. aftermarket pistons are all for k20/k24 franks and are actually closer to 87.5mm. I have a K24 block with 7k miles on it at a machine shop getting a 1/2mm overbore because the pistons wont fit. because the pistons are a direct fit for K20's not K24's. you shouldnt have valve interference problems unless you run a really high lift cams. but since youre going low comp, you should be fine. i agree with the previous post; just call and find out.

 
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metal viper what do you mean by deck clearence? do you mean block deck hieght OR "Piston" to deck clearence? or simply... head chamber CC?

the reason i'm asking is because i wonder how would i end up with lower CR's...


and skipbarber... i would really like to know how would a piston designed for 87mm blocks, and that it's actually 87.5mm, can be a DIRECT fit to an 86 mm k20 block!? or are you talking about k20 heads not k20 blocks...


i actually contacted the seller and he told me that there's a possibilty for piston valve contact on a high lift

so that's why i'm woried

 
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head combustion chamber. i havent found the post where i read it but its on H-T somewhere. b/c if there is more area in the combustion chamber there is less compression of air in the chamber.
thats y i said to just call, i dont want to mislead you from a thread i cant show you from a while back if that makes sense

 
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yeah it makes sense...i'm aware that there is combustion chamber volume diffrence but i don't know by how much...