pistons

[N242]

hi

i have 302 88' not ho engine with e6sf head 65 cc ( i think from t-bird because i have s in the head )
and i want to buy summit pistons part Number SUM-17302-00




i need to know what is the compression ratio that i get

10X

 

[5.0ina66]

hi

i have 302 88' not ho engine with e6sf head 65 cc ( i think from t-bird because i have s in the head )
and i want to buy summit pistons part Number SUM-17302-00




i need to know what is the compression ratio that i get

10X

From the looks of it, that's pretty close to an H273CP, and those won't even get you 9:1 in that setup. Then again, it doesn't really matter because those heads are totally worthless, I have a set and I couldn't GIVE them away!

 

[N242]

hi
what is the cr with this pistons

http://store.summitracing.com/partdetail.asp?part=STL-H273CP&autoview=sku

 

[5.0ina66]

hi
what is the cr with this pistons

http://store.summitracing.com/partdetail.asp?part=STL-H273CP&autoview=sku

About 8.2:1. Like I said before, those pistons suck and the heads do too. A $25 set of E7s and some high compression CHEAP pistons would give you quite a bit more HP and a better running engine.

 

[N242]

i know that its a suck head but
i am not living in usa, and i have a problem to change the head .
so i need to make the bast with this .
so what piston are u recommend ? ( i went something between 9-9.5 )

 

[5.0ina66]

i know that its a suck head but
i am not living in usa, and i have a problem to change the head .
so i need to make the bast with this .
so what piston are u recommend ? ( i went something between 9-9.5 )

I see. In that case, I'd have the heads cut to 60cc and port them as much as possible, and use the summit pistons with an 4.03" bore with a 4.03" bore headgasket that has a .039" compressed thickness and zero deck works out to 9.6:1

 

[Mr. Rustypwnz]

I have a set of e7's you can HAVE just come get em, this is my 3rd pair throwing in the trash..

 

[N242]

thanks
can you show me how to calculate cr ?

 

[5.0ina66]

thanks
can you show me how to calculate cr ?

Yep, I used this:
http://kb-silvolite.com/calc.php?action=comp

 

[vikingpower]

I have a set of e7's you can HAVE just come get em, this is my 3rd pair throwing in the trash..

 

[N242]

Yep, I used this:
http://kb-silvolite.com/calc.php?action=comp

what is the parameter that i need to put in the Deck Clearance?

 

[5.0ina66]

what is the parameter that i need to put in the Deck Clearance?

That is how far down in the cylinder the pistons are when they're at TDC on the compression stroke. I measured my 5.0L at about .003" but it can vary.