Your opinion.....ring gap for n/a 434 sbc

[rewguy]

13 deg. 15-1, race gas, drag race, total seal ap top rings, Napier second. Std. Tension oil ring, vac pump.

[Mark O'Neal]

.018 - .021

Or more.

[cjperformance]

Piston material?
Block filler?
Target run temp?
More info.

[Frankshaft]

I would set them at .024 and .030 2nd.

[rewguy]

2618 forged. Probably 175 degrees race temp. No block fill. Darr lil m block.

[engineguyBill]

.0045" to .0055" per inch of cylinder bore for the top ring; .0060" to .0070" for the second ring.

[steve316]

I would go with mark's recommendations for the top ring and open up the second ring to .025

[steve316]

Why are you running a standard tension expander with a vacuum pump?

[ProPower engines]

13 deg. 15-1, race gas, drag race, total seal ap top rings, Napier second. Std. Tension oil ring, vac pump.

Are the pistons gas ported in any way ???
And why a std. oil ring with a vac. pump?? Why no go with a low tension oil ring?? Issues with the combo before??

[rewguy]

no reason. I just put back exactly what was in there.

[induction apprentice]

Top .027"

Second .030"

[af2]

no reason. I just put back exactly what was in there.

Then run it the way you did.
Why people set them at the closest they will ring butt is beyond me!

[In-Tech]

I'm with ya Adam, there isn't enough TIME, at any kind of reasonable racing rpm,for a couple thou extra to make a difference, gap within reason and put extra safety to it if you are worried about having to chase your tune.

Then put a vacuum pump on it and fuggit 'bout it.