? SBF 20 degree heads with C3 dished pistons?

[fomocosteve]

Hi Guys, I have a query, I have a set of C3 pistons in 30cc dished, and I was wondering wether anyone had used something similar with a 20 degree SBF head. Since I have em laying around already, I'd love to use em if I could. Wanting to feed em about 17 lbs of boost for about 800-850 fwhp. Steve

[Walter R. Malik]

Hi Guys, I have a query, I have a set of C3 pistons in 30cc dished, and I was wondering wether anyone had used something similar with a 20 degree SBF head. Since I have em laying around already, I'd love to use em if I could. Wanting to feed em about 17 lbs of boost for about 800-850 fwhp. Steve

The notches are in vastly different places so would do no good ...
if the dish itself is deep enough for the valve lift near top dead center to still have clearance is the only way they would work.

[mag2555]

First off are those Pistons your will be running able to handle 850 hp?

[fomocosteve]

I was thinking they should be able to do 850 hp as they do that N/A with those pistons, I also thought about the dish and might get away with it, though I have another set of standard 20 degree pistons @ .030 over( block is at .040 and needs to go out further, C3 pistons are .056), and I measured the relief depth, it appears they would need a little bit of valve relief and I could have that done at a machine shop. The other option is instead of going 20 degree heads which I haven't purchased yet, maybe to go for either a N53 or a Trick Flow head where the valve angles might work without cutting any more depth out of the piston and potentially destroy it under load.

[Walter R. Malik]

I was thinking they should be able to do 850 hp as they do that N/A with those pistons, I also thought about the dish and might get away with it, though I have another set of standard 20 degree pistons @ .030 over( block is at .040 and needs to go out further, C3 pistons are .056), and I measured the relief depth, it appears they would need a little bit of valve relief and I could have that done at a machine shop. The other option is instead of going 20 degree heads which I haven't purchased yet, maybe to go for either a N53 or a Trick Flow head where the valve angles might work without cutting any more depth out of the piston and potentially destroy it under load.

The Trick Flow 11R has a chance.

[fomocosteve]

Ok, will have a look at em, Thanks

[fomocosteve]

Cam is a solid flat tappet turbo grind withy only .519 lift and with .018 lash makes .501 lift so that should help and might work

FORD WINDSOR SOLID CAM

VALVE SETTINGS: INTAKE 0.018" HOT
EXHAUST 0.020" HOT


LIFT: INTAKE @ CAM .324"
@ VALVE .519"


EXHAUST @ CAM .320"
@ VALVE .512"


Adv duration INT 283 EXH 275

Duration @ .050 INT 246 EXH 238

LOBE SEPERATION ANGLE = 114°

[cab0154]

I would use the isky tool and cut them if they wouldnt clear. Funny how most of the time you build something with the wrong/used/cheap parts that people say wont work, and then the combo runs better than expected.

[fomocosteve]

Cheers, there's still a bit of meat in em and can't see em needing that much of a cut if at all, I'll see how they go, they're too good of a piston, and too hard to move on to not use em, And at 8:1 Comp perfect for boost.