Stroker 340>416 Build Advice

cpearce said
I wouldn't worry at all at 10.5:1 compression on 91 octane, especially with aluminum heads. As earlier stated, I run 10.12:1 with iron heads on 91 octane, and a cam with 106 degree lobe seperation angle. Tight closed chambers, quench, and dished pistons, combined with proper timing, and tuning and you will be fine. Unless you zero deck the block, I suspect your compression in reality, will come out lower than the math on the parts says it will be.

@autoxcuda my post is in no way meant to say you are incorrect, as I realized after typing, it may sound. I am mearly relating my experiences with 91 octane. My friend Murray, has a 410 stroker, with Eddy heads, and 10.5:1 compression, and a solid lifter flat tappet cam with 244 degrees duration at .050. Neither he, or I are experiencing any detonation on 91 octane, at around 3000ft.

I wasnt specifically planning on zero decking the block but like I mentioned the machinist will have to deck a currently unknown amount to remove some gouges that are on the head surface (was there when I bought the block unfortunately).

Here comes another newbie question: based on internet search a stock 340 had a -18 deck height (the top of the piston was above the deck) when Im getting this engine built is that a value that be changed? In my head the crank and rods set that pretty much in stone based on the fact Im getting a kit.

So if I understand dynamic cr it can be used to help a higher static cr engine have less chance of detonation? So a cam with higher durations will lower dynamic cr right?