Stroker Kit... trying to figure out compression

[GearAddict]

So I ran into a good deal (I think) on a stroker kit... not sure who the guy bought it from, I'm thinking Indy maybe. The cost on this may be too good to pass on.

Here's the specs

440 - 500cui

Eagle 4340 Steel Crank - stroke: 4.150 - 2.375 pin
Eagle ESP H-Beam Rods (6.76 x .990 pin)
Wiseco Dome pistons - bore size 4.375, compression height 1.850

I'm thinking I would start off by running it with a stock set of 906 heads (I have not CC'd them) but thinking they usually run 84-88cc's? Later on move to an aluminum head.

What I can figure is that this is for a .055 over 440 block...

I'm worried that the compression is going to be too high for pump gas... can someone help me with the comp calc?

I'm not trying to build a 700hp beast at the moment. more thinking big low end torque, cammed for low RPM fun (5K peak?). Stout bottom end to start and then if desired in the future I can dump money into getting high flowing top end. I'd be happy just sitting in the 500hp/500tq range, which I assume with that many cubes should be no big issue.

 

[TetanusShot]

I plugged it into my excel calculator, used your numbers plus 10.72 deck ht, 88cc chambers, .039 fel pro head gasket, but calculated for flat top pistons.

Got 499ci with 10.67:1 compression, added an 8cc dome (guessed) and got 11.47:1

I would find out what size dome those pistons have, sounds like it will be high cr for iron heads.

Definitely verify the cr with another source before spending any money though, never trust some yahoo on a forum.

Good Luck!

 

[GearAddict]

Thanks, will do.. I'm trying to get the piston specs today.

 

[383man]

Also has the block been decked ? Ron

 

[SlinktRR]

Probably have to get new dished pistons with compression height for zero deck. If the deck hasn't been shaved then you are 0.040" down, which helps but the domes will put you well into the 11's still. You will need an accurate deck height measurement.

 

[GearAddict]

Thanks guys.. I haven't bought a block yet, I'm just trying to look for some good deals on bottom end kits, and will focus my build around that.

I'm going to pass on this one since the dome height looks like 7cc's and that will push the compression out of the pump gas range. The deal was good, but not good enough to throw another set of pistons on top of the cost.

 

[1969CoronetR/T]

RPM machine has good prices and they use Scat cranks.

 

[rumblefish360]

You don't need a stroker for 500/500.

 

[GearAddict]

You don't need a stroker for 500/500.

True... But my thinking was 500/500 with solid bottom end, forged internals... then if I want to kick it up from there.. I could get 600ish with some spend on the top end at a later date. If I'm buying a new bottom end, why not go big?