JimboGT01

Okay i am about to dump a crap load of money in the stang and i want to make sure im doing it correctly. First, The stock pistons in our cars and they dished at all? Can pistons be dished in and out?does this help with compression ratios and what is the best compression ratio? I am going to be putting in stage 2 cams so does that mean i have to have my pistons dish in to avoid contact? I am also considering boring out .20 over, what will this do for the performance? For heads i plan on getting mine ported and polished. What is the most flow you can get out of them? I am wanting to do a new rotating assembly with fully forged items and piston to match everything else. If iget the cylinders bored .20 over, Is bigger pistons all i need? Heads are getting ported and polished. Cams are going to be either stage 2 vt or custom grind. ALL SUGGESTIONS ARE WELCOME. just no stupid ones and nothing about boost or gas aleast not yet!

Tellowman24

lol

Mark99GT

For the compression ratio you need to decide what you want to do with the car. If its gonna stay n/a for sure look into flat tops or a small dish like 9cc or so. If its definitely going to be boosted, look for around an 18cc or so dish. Higher compression needs higher octane, keep that in mind. 10:1 would be good for a 93 octane tune, but not so great with a power adder. Let us know what the plans for your car are.

Id suggest CP pistons first, then Manelys and the like. Look into the differenced between 2618 and 4032 forgings for pistons. It can make a difference depending on what you want out of the car.

Boring .020 over wont add much in displacement, but will provide a perfectly round cylinder bore for a better ring seal. Make sure torque plates are used to bore the cylinders. Youll need .020 pistons and rings to match.

If you're running a high lift cam youll need to have the pistons fly cut. Dish has nothing to do with it, the valves contact the outer edge of the pistons; flat top or dished. Might want to have it done regardless so youll never have to worry about PTV contact should you ever decide to change out your cams again.

I think the usual flow numbers for stg II p&p heads are around 190-200 exhaust and 220-230 intake. Id look to Foxlakeracing.com for this.

Mark99GT

Why be a dick? Its more tech than a lot of the othercrap posted here.

JimboGT01

well for the time being im going to be keeping it n/a but in 2 years after i graduate ill be going for some kenne bell power. So should i go with a medium dish? I dont plan on anything over 450 horses. Can you buy pistons with a fly cut or is it something that has to be machined?

JimboGT01

also what are torque plates in reference to boring out the cylinders?

Mark99GT

If you're only looking for 450-500, a mid/low 9:1 cr should be fine, close to stock something around 18cc dish. Itll also make it more fun to drive n/a on the street in the mean time. You can always throw a meth injection kit in the mix too.

When choosing pistons, take into accout head gasket thickness, piston to deck clearance and combustion chamber volume. Or just tell your builder what you want and let them sweat the details.

Torque plates replicate the stress placed on a block when the heads are torqued down. The block deforms a tiny bit under the clamping force of the head bolts/studs. So the machinist should use torque plates to simulate this stress while boring the block to ensure a round cylinder bore when the engine is bolted together.