One more about squish/quench

[Nacho-RT74]

I have read a lot about this. It seems to be a general agreement, the best quench gap is .040" but have read some opinions on several mags articles it can go from .032" to .050" per several engine builders ( iron rods ), although the more articles available around come from CHEBBBBY mags.


So, if you can't make the ideal .040" would you go to smaller gap or bigger gap in between those numbers with stock iron heads, thinking on a safe CR and heat produced.

I can't get the exact numbers I could get once the block deck is squared, but will have to play with .040 and .051 gaskets to choose ( both felpro ), with pistons MAYBE a bit over the deck ( maybe between .5 and 1 cents OR MAYBE still can be just right at the deck height ), being the .051 gasket a bigger bore and reducing some of the CR.

Everything is still hipotetical. Just looking forward.

[c00nhunterjoe]

If you cant get .040, consider going tighter. But that all depends on your ptv clearance. Also depends on what your goal compression ratio is.

[Nacho-RT74]

Pistons got recessed areas to valves and cam is crower 282hdp. Valve lift is 507 and 480 as far I recall. I think is safe on that side

CR, well I want the higher as posible but still safe on iron heads with heat safe too. My exhaust are getting really hot!

It seems per calculators i can be in between 10.3 and 9.85 or so, playing with all of this.

[c00nhunterjoe]

You should really check the clearance with check springs and a degree wheel. Your dynamic compression needs to be between 8 and 8.5:1 on iron heads. You need the rest of the cam card specs, specifically intake closing to figure that out. Static compression means nothing as far as octane requirements.