Big blocks pistons with domes are either for closed or open chambers. Open chambered pistons can only be used with open chambered heads while closed chambered pistons can be used with both.

Your have a open chamber piston and your trying to use close chamber heads??? That's the problem

@davidreed6070

2 жыл бұрын

You have that right

100cc heads, no wonder there's a problem.

Man please find someone experienced to help you.

The lift hardly matters when it comes to piston to valve clearance. At max lift on the intake valve the piston is half way down the hole and the exhaust valve is closing when the piston is on the way up. The duration is what has the biggest effect on piston to valve clearance.

The stock pistons have 2 recesses because it can be put on either bank. Big block engines have no problems with ex valve clearance.

279 casting are L29 100cc closed chamber heads

You will have to use open chamber heads I believe they are 119cc chamber

FWIW IMHO Assuming that you are reusing the gen 6 (l29/vortec) heads is the reason why you are experiencing piston to head contact. Can’t run a dome using those heads because of the fast burn chamber. Easiest way would have been to remove casting on the heads to accommodate the dome. If I heard correctly you have your pistons .030 down the hole with .030+/- gasket compressed? Not ideal but will run. To get optimum performance you need a quench of around the .040 range. I.E standard .025 down the hole then use steel shims if all surfaces are straight .015 compressed gasket/shim. On another note it’s good to see people still building there own. Keep wrenching!

Domes are measured in cc

The money you spent getting those pistons machined and rebalanced could of went towards a good set of aftermarket aluminum heads that would of worked perfectly with those domed pistons.

Your original pistons were flat tops. They generally have valve reliefs on both sides so the piston can be installed in either direction. Basically their made dummy proof. A domed piston can only be installed one way because of the dome. So only one side of the piston will have a relief. If it was me I'd get as set of open chamber heads and have the block decked to zero you'd make more power doing that.

There also open chamber pistons

Put that thing together the best way you think possible. Run it Let it grenade. Take it apart and figure out what went wrong Only way your gonna learn. Expensive but the best lessons learned are when you spend a lot of money on it and get nothing from it……except experience 🤣🤣🤣🤣

The term is valve reliefs not release. You will have to fly cut the Piston domes if Summit will not exchange pistons. This is why you should measure everything on non stock applications. And this is why professional engine builders charge so much. Alot goes into building an engine correctly!!!

Those are about an 11-1 piston depending on which head. Vortec heads the special Dome piston

You got the wrong pistons for them heads. Good thing you checked. Wonder how many people didn't🤦🏼‍♂️

The stroker kit has more stroke=increased piston travel.

Was just curious if you are running standard 454 piston with a stroker crank you need a piston that is made for the increased stroke the pin will be further up the piston

@kinoploucha5129

Жыл бұрын

It's a complete eagle 8.0 kit

I ran into the same issue with my 454 build. Did you figure out what the solution is. Did you Fly cut the pistons or machined the heads?

@kinoploucha5129

3 жыл бұрын

Yeah. I should have checked the casting number on the head to make sure i was ordering the right pistons. I had the domes cut off those pistons and the rotating assembly re-balanced.

Valve "reliefs" not "release". Sorry, but words do have meaning.

@dadyo63

2 жыл бұрын

Explains why he,s havn trouble workn it out.lack of experience

Take that block to a professional machine shop doing these builds can cause you heartache and lots of money if you not familiar because its tricky making the combinations work if its not balanced it will blow up Good Luck

It looks to me you have the wrong pistons. Stock pistons have a pin height of 1.645" If you use a 4.250" stroke crank you need a piston with a shorter pin height ie 1.540"

You have to double-check everything. I believe Jen six only comes with open chamber heads. By the look of that Dome you have closed chamber Pistons with an open chamber head. Not the other way around. And please do not machine those Pistons

you need a old set of heads those gen 6 heads won't work ,you need early 70's head ls5 or ls3 heads ((not small block modern day LS heads) old 70's big block LS 5 or LS3 OPEN CHAMBER 105cc

Wrong pistons for your heads

That looks more like a gen 5 block... vortec heads can only be run w flattops

@kinoploucha5129

Жыл бұрын

It's a gen 6. I got the Pistons straight.

Why did you order a stroker kit if you didn't machine work your motor? Anytime you use any stroker kit you have to notch the motor or block for clearance and then you order your assembly kit base on your clearance and the compression your trying to run for your cam operation. BUT if trying to build your motor around heads size then I understand.

@kinoploucha5129

3 жыл бұрын

It went right in with no cutting or grinding.

@Mylee837

3 жыл бұрын

@@kinoploucha5129 I hope you fix your problem.I went with .60 over 468 and high compression to flow 320 runner heads so i don't any issues flexing my crank shaft on stroked build.

@andy347495

2 жыл бұрын

Order your assembly kit based on your clearance, what do you mean by that?

@Mylee837

2 жыл бұрын

Mic your dimensions for pistons and crank clearance then order your parts.

@andy347495

2 жыл бұрын

@@Mylee837 im not sure what are are trying to say. The cylinders are bored and honed to fit the pistons you get. You don't measure your cylinder and buy pistons to fit.

You need a different head the chamber is isnt ment for some dome pistons

O take piston to merchine shop have piston fly cut and balance

@kinoploucha5129

2 жыл бұрын

I did already and had the complete rotating assembly rebalanced.

You have rotators this looks like a mess better take to a engine builder

@brandoncherry1651

3 жыл бұрын

On valve springs