squish

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:?: Hi I've been reading your articles for some time so i figured i'd join in for a little advice. I use to run a wissota super stock some years back and i ran a 300 six. It really ran compettive. This year i'm running a modified. I buildt anther six It has 240 rods malhe pistons 0 deck height' highly ported head 1.94 1.6 valves stock stroke. The head is milled 80 ths. Totally balanced 8 lb.clutch. holman moody intake 750 alky carb. roller rockers. The question i got is what squish i should run.for clearance. The engine is going to turn abot 7000 to 7500 rpms. Were figured this motor will run over 500 hp. The cam was done for me by berry cams Lift is 570 and 290 duration with a 108. I always liked the six it really bothers the v8 boys when you beat them.
 
Between .035" - .040" is the accepted distance. Tighter gets you into trouble when tolerances close up from heat expansion. More than around .055-.060" loses the "squish" effect.
Rick(wrench)
 
Do you have to lengthen out the wheelbase to get the motor to fit?

My experience is that the chebbie guys hate getting beaten with a ford, much less a ford 6.

I would agree with rickwrench. We always shot for about .040" IIRC.
 
If your pistons are forged, I would not go no less that .040" cold clearance. Everything in the engine grows when heated, including the crank, rods, and especially forged pistons. Your quench clearance may end up at much less than .040" when running hot.
 
I just reread my post. How do you like my English? I meant to post," I would go no less than .040" cold clearance.
 
:? Howdy I raced the engine last week i have a squich of 34 ths. I was a little high geared not knowing what to expect. It was a little slow out of the corners But half way down the chute she started sreamin. The only problem i had is that i leaned down and burnt a plug So i'm jetting up to 94 jets on alky and a little colder plugs. And i did lenghten the wheel base to 112 in. to fit the motor. I was turning about 66 67 hundred rpms. This week were going to gear it down to get a little more out of the corners.
 
I'm running a 240 head ported. It flows 224 cfm on the intake with 1.91 intakes and 1.6 ex. We found that the 194 had to much shrouding. We got better #s with the valve cut a little.
 
With the head milled 80 the compression is about 13;1 About 250 or a little more pounds of compression.
 
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