Another Compression ratio and build spec's thread

I know there's tons of these threads already and Larry usually gets lured into figuring out people's compression ratios for them even though he posts a awesome article and a nifty calculator. That being said, why change a thing right!! Jokes aside I did use a different calculator and figured out some numbers. I'll post my build specs here that way others with more experience with this stuff can check my work.

Bore diam. 4.325
Gasket diam. 4.380
Gasket thickness 0.027
Stroke 3.900
Rod length 6.608
Comp dist. 1.995
Deck height 10.555
Dome volume -26cc
Pistons 0 deck
Combustion chambers 68cc (edelbrock specs)

I ended up getting 10.46:1. That works for me considering I want to stay on pump gas given it's a street car.

Other build specs for suggested HP/TQ numbers

-Eddy aluminum heads fully port/polished, Gasket matched, polished Combustion chambers, 3 angle valve job 2.125 Intake valves 1.75 Exhaust valves 1.6 comp pro magnum roller rockers, adjustable guide plates
-TA 290 94H cam degreed with TA billet 9 way gear set, TA grooved bearings
-TA shorty headers Gasket matched and ceramic coated into 2.5" dual exhaust
-Performer intake Gasket matched
-800cfm QJet built by Ken Everyday Performance
-DUI distributor, 8mm Taylor wires
-Autotec pistons 0 deck
-Reconditioned stock rods (rod and crank bearings 10/10)
-proform timing cover with oil passages port/polished
-TA oil pump kit, booster plate, adjustable pressure regulator
TA HP water pump
-Romac balancer
-JW the wheel flex plate
-ALL JW oiling mods and rear balance line.
- JW 9.5" big car converter 3000-3500
-fully built TH400 trans
-3.08 posi rear

 

10.34

On butler performance calculator https://butlerperformance.com/n-12872-compression-calculator.html

 

The Autotec Pistons I bought from TA have 20 cc dish. Yours seem a little more pump gas friendly.

 

It’s low enough you can do a 100 shot of nitrous.

 

I got mine from JW, he spec'd them out that way for my build I'm pretty sure.

 

Thanks Larry, I knew you wouldn't be able to resist. But I did do it myself first before relying on you for it. On a serious note what's your thoughts on the compression amount, should I try and get a bit more or leave it be? Also what's your thoughts on HP/TQ levels for my build?

 

As fun as that would be I think I'm going to pass in that idea........for now.

 

Awesome thanks Larry. Essentially my original goal for my build was 10:1 minimum and anything over 500HP/500TQ was good for me. If I were to shave the heads a bit I could probably get a bit more out of it but I wonder where would it put me compression wise? I don't want to get into race gas territory.

 

I'm right at 11.0 with aluminum heads, I'd prefer your compression ratio

 

64.7 cc comb chamber
20cc dish
Zero deck
.038 gasket thickness
3.9 stroke
6.6 rod
4.359 bore
4.380 gasket bore

 

My cam is a TA 290 94H.

 

I misread this earlier post and thought you were talking to me.