Compression height on the 3500.

[Guest]

Anyone measure how far out of the bore the 3500 pistons come? I am sure it will vary slightly from engine to engine and all but not by much with todays manufacturing processed and all. I just want a decent idea.

Now I know the 3400's come out of the block. Is the 3500 the same? How far does the 3400 pistons poke out?

I am doing this so I can help compute my quench.

Thanks

[Guest]

Or hell if you have the Compression height of the piston that will work too and I will do the math.

[SappySE107]

I may have written it down but it was half that of the 3400 engine. .10 or close above the deck.

[Guest]

I now its not a GM piston but Silv O Lite lists the 3400 piston with a 1.45? CH. I don't remember exactly but I did the math and it came up to be .007 above the bore on a 3400. This is of course I would assume if everything was blueprinted to spec. That is using the 8.18 Deck height of the 3500. Not sure if the deck height of the 3400 is different but if it is then it comes up much higher.

If the 3500 piston comes out .010 out of the bore thats a decent amount allowing not enough clearence for a thinner head gasket.

[SappySE107]

3400 pistons come out .2125" or so.

[Guest]

2 tenths of an inch? No way.

[SappySE107]

you know what, im being stupid. .02125 and 3500 is .010ish.

[bszopi]

Using values from the following thread:

http://60degreev6.com/showthread.php?t=27898&highlight=compression+dishes

That shows the 3100 and 3400 as different. The 3100 comes out ~0.02" while the 3400 stays in ~0.01".

[SappySE107]

Well, i measured teh cc of the 3400 piston around 32 I though. Posted that number for sure. I measured the piston coming out .02125 as well on a 3400 so thats wrong.

[Guest]

I would beleive .010. I had the thought of using a iron head gasket to bump compression ratio. Rumor is .040 crushed although I have never measured it.

That would put he quench at like .030 which is way too tight from what I have read. It would prob touch at high rpm or if the piston wiggles just enough its night night.