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I'd like to do the same to build a much higher comp gen4 engine cheap. I'm not sure if the new pistons clear the counter weights on the gen4 crank though. And if they don't Can I simply run gen V pistons on a gen4 rod? I'm shooting for a budget 13:1+ on e85
So the valves are reversed in the Gen 5’s. If your looking at using a Gen 4 head, the Gen 5 pistons won’t physically work, because the valve pockets are reversed, for the Gen 5 heads.
Would that not depend on the cam and lift you ran?
Or maybe even flipping the piston 180*? They are centered rods, are they not?
appreciate the input!
No sir. Cam has nothing to do with it. You can’t flip the piston 180…it just will not work physically. That valve pocket on those domes in the pic…that is the exhaust valve pocket, or relief. In a Gen5 engine the exhaust valve is on the left. In a Gen4 engine, it’s on the right. You have to run a Gen5 head with those pistons.
Really appreciate the input! So not even worth tossing one piston and checking what the PTV would be in your opinion? Do we know how far the dome sticks out above the deck? I could run a .5xx lift cam
Really appreciate the input! So not even worth tossing one piston and checking what the PTV would be in your opinion? Do we know how far the dome sticks out above the deck? I could run a .5xx lift cam
That's what they said about stock pistons and boost 20 years ago too... look where we are now. They are relatively new is all. I'd like to know if anyone has tried and what the PTV clearance actually is.
If one could simply toss these in with a low lift cam and shaved heads to get 13:1++ on E85 it'd be worth it IMO. Thought it was worth looking into seriously is all. I don't have a piston to test. But I can get L83 long blocks pretty cheap here.
That's what they said about stock pistons and boost 20 years ago too... look where we are now. They are relatively new is all. I'd like to know if anyone has tried and what the PTV clearance actually is.
If one could simply toss these in with a low lift cam and shaved heads to get 13:1++ on E85 it'd be worth it IMO. Thought it was worth looking into seriously is all. I don't have a piston to test. But I can get L83 long blocks pretty cheap here.
What you said about 20 years ago, and your present situation now, don't even relate. You would have to do so much monkeying around to make the Gen V pistons to work, it's not worth it.
Trying to make something work just because you have it on hand isn't always practical or even sensible.
I have Diamond pistons and they have two fly cuts. They have a pic on their website.
I think my cam is 590/620 lift, and putting the heads on, I forgot the locator "pin" and cranked the engine over by hand and the valve hit the piston. Cost me a head gasket for forgetting that. The L83 heads have a different valve angle too. If you have the equipment, give it a try.
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