Best pistons??

[CobraT_Type]

So I'm having my block bored .030 over and I wanna run a procharger, what's the best piston to use in this case as far as compression?? I have the 5.0 btw.

 

[Martin6107]

What did your machinist recommend?

 

[CobraT_Type]

He just said low compression. I'm running gt40p head so I'm stumped on what I need

 

[2DXTRM]

Assuming stock rods and crank, a TRW/Speed Pro forged piston would fit the bill.

 

[CobraT_Type]

What compression tho? Would a 9:1 work?

 

[F8L BYT]

Ross/ Diamond / Manley are all great! Honestly I wouldn't spend a bunch of money on them though. Since it looks like you are a 5.0 pushrod engine and I'm assuming the stock block which is only good for ~500-550 anyway

 

[CobraT_Type]

Is a 9:1 compression good tho? I'm trying to figure that out. And should I run a flat top or reverse dome?

 

[405_94Cobra]

Like F8L BYT said the block can only take so much anyway. Someone correct me if I'm wrong but I would think 9:1 would be fine

 

[jbrown1238]

I am no expert but if I were running the same set up I would use Probe SRS Forged Pistons 10682-030. They are a little pricey but still a good choice. I think the compression should be around 9.0-9.25 with stock to moderately worked GT40P's.

I am currently running a similar cast piston with the same compression distance and head volume on my 306 with ported GT40P's and really like the combination. If you think the compression might still be a bit high for a blower application you can drop down to about 1575 on the compression distance with the same style flat top piston.

 

[OU812IC]

How much boost? 8-10 PSI 9:1 would be ok. Much more than that I would have a different opinion. You start throwing boost it changes things real quick.


Du