340 stroker 422
- Thread starter Miszny
- Start date
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This is a street car setup with small cam. I was disappointed about nothing done to the chambers but price was good so really can’t complain.
This is what I used for something built to make some power.
Miszny,
I thought your cam was ground on 108 LSA. Hence my comment about installing it at 108 ICL, which is 'straight up'. Straight up means the ICL, ECL & LSA are the same. If you advanced this cam 4*, the ICL is 104 & ECL is 112.
I thought your cam was ground on 108 LSA. Hence my comment about installing it at 108 ICL, which is 'straight up'. Straight up means the ICL, ECL & LSA are the same. If you advanced this cam 4*, the ICL is 104 & ECL is 112.
There is cam card attached in post 42.
cookietruck
Well-Known Member
If straight up on yr timing set gets you 102 ICL, then yes, retard it 6* for a 108 ICL.
This is correct. Lower compression and less quench often still results in detonation.
This should be stated with an “*” after it.
It’s a bit more complex than that.
famous bob
mopar misfit
Why not try 93 "real" gas , 3 something a gallon around here ...
He’s in Poland.
could unshroud the intake a littleYes I already did.
Is it possible that I gained almost 3.5cc that easy? Looks to be 67.5cc chamber already.
Will measure it again tomorrow to make sure will also see other chambers to see how they compare. If thats the case, then I'm at 11.25:1
I also retarded the cam and now its at 106.5 ICL. This timing set has only 2 and 4 degrees retard and advance.
Will measure it again tomorrow to make sure will also see other chambers to see how they compare. If thats the case, then I'm at 11.25:1
I also retarded the cam and now its at 106.5 ICL. This timing set has only 2 and 4 degrees retard and advance.
cookietruck
Well-Known Member
I just used the diamond pistons calculator
6cc piston dish. .240” top ring down.
4.18 gasket bore.
Piston .010 down and yr 67.5cc chamber.
11.1 with a .040” gasket
10.8 with a .050 gasket
6cc piston dish. .240” top ring down.
4.18 gasket bore.
Piston .010 down and yr 67.5cc chamber.
11.1 with a .040” gasket
10.8 with a .050 gasket
He's getting close, I figured some chamber work was needed anyway, could use a tad more.
I cleaned the chambers further and unshrouded the valves. Will measure tomorrow whats the current cc. If my measurments are correct it will work no problem.
I built 446ci big block this year which was 11.3:1 with 244@050 solid flat tappet cam and RPM heads. It ran on standard gas just fine when the temperature stayed belowe 180 degrees. Finally we ended up putting different tstat in it and now it runs perfect on premium gas with 32 degrees advance and distributor curved to all in at 2200rpm. This is in a 56 dodge truck with 3.23 rear end with 3500 stall converter in 727.
Rat Bastid
Dunamis Metron
Im not sure why you want the timing all in by 2200? IMO that’s too quick. You almost have the timing locked out like that.
@Miszny If your or cookietruck’s calculations are correct, build it and send it, your in where you need to be. As stated earlier, I’m running a 11.09-1 - 360 engine on US pump 93 octane without issue. Intake duration of the Hyd roller is 224@050.
Go for it!
I agree with RatB on timing. That’s to quick.
The truck needs also carbs done, has cross ram intake, it’s running rich. Weather went to the toilet quicker this year.
We will work on the distributor and carbs in spring but the fact it’s not pinging like that gives me hope.
Dartswinger70
Well-Known Member
I like it. 
What curve would you suggest for this?
I have all msd springs for the distributor.
It turned out very fast, weighs only 3120 with full tank of gas, no driver.
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