dave if ya machine the heads ,dont forget your intake and push rod holes if got the fat push rods as well ,have ya had it to the track again ,i was thinking the same dave with mine ,bigger cam 272/278 roller 12.1 comp but i said stuff it all and turned the bottle on now i have all the power that i can handle at the track and a car that runs pump on the street and your combo is perfect for nos ,dont even change ya converter and run good fuel at the track and run nines and drive on the street and run 10,s on pump that is sweet in any language . ian

the 8" PTC convertor is 4800-5000.
ian, are you sprayin your small block now?
best time so far is an 11.10@123 with a tight convertor. heres some vids.
http://www.youtube.com/watch?v=H-ONEEn5W1c
http://www.youtube.com/watch?v=-LRu0y0HE40
http://www.youtube.com/watch?v=OX2Hyge2BP8
first two are with flowmaster 44's and last is with borlas. broke a ball joint on last one also.

your vids show 124 mph thats 10.70-80 what was ya 60 ,s ft do a couple meetings testing ,try taking 2 jet sizes out and play with the timming and tyre presure i picked up 3 mph play with dizzy , jets, the vids i got shows aspirated pass b4 changes then/after changes also took radials off an ran slicks 3rd vid is nos with radials and 4th is nos with slicks
[url=http://www.youtube.com/watch?v=tydI5eF2SXE]http://www.youtube.com/watch?v=tydI5eF2SXE[/url]

[url=http://www.youtube.com/watch?v=PVCrT5G4HIw]http://www.youtube.com/watch?v=PVCrT5G4HIw[/url]
[url=http://www.youtube.com
http://www.youtube.com/watch?v=K11m8i6w6...9hDeKyvXU[/url]

I'm running 11.4 CR with Indy 360-2 230 cc heads, combustion chambers are 65cc. Its set up with zero deck with a 0.40 gasket & JE flat tops. The cam is 260/266 @.050 .675/.675 lift, 108 installed at 104. I run it on the street with 93 pump, at the track with a 50/50 mixture of 101 & 93 just to be on the safe side. So far plugs look good & no problems.

Car is a '73 dart sport. 3080# with me in it. Dana with 4.56 & 29.5 Hoosiers. Cal Traks,BG Racing 904, 8" A-1 vert flashes at 5200, Ported Indy intake with 1050 race Demon. Restoblock at 4.030, callies 4.00 dragonslayer & h-beams (408). Car has less than 200 street miles, has only been to 2 test & tunes. Best time so far was 9.87 at 136.53 with a 1.39 60ft & I think it was running fat.

thats one bad small block tuff azz well done .

ian, my best 60 was a 1.63, thats the reason for the vert change.
b1dartsport, nice combo, looks like its workin.

My 416 had 11.9 to 1 compression it ran just fine on 93 pump gas..

what does your combo look like 340srule?
i'm thinking with an aluminum head, coated piston tops and .035" quench 11.5 should work. i was trying to get an idea how far i could go or wheres the limit, because i want to go there on pump gas.

Dave,make sure you do a good job of getting rid of edges & angles on your pistons. I used a Dremel with a light grit stone to get rid of any edges on valve reliefs & put a very slight radius on edges of pistons. Followed this up with a good polish with 1200 grit sandpaper. If I were you, I would also consider going to a flat top instead of cutting those heads. In my experience I have always seemed to get very good performance out of lower compression race combos using flat tops. I know money is an issue here, but in the long run those heads are very expensive & I think you will be limiting your future options. Good luck with whatever you decide, let us know what the end result is. Randy

thanks for the info. i'v got $800 into the CP dish pistons plus the coating, so i will be using those. as far as shaving the heads, indy says .100" max. i will be shaving .030 to make a 60cc chamber. i'll let ya know the results.

Your elevation above sea level plays a big part in what CR you can get away with.

dave stuffed up me post go to youtube and search ap6 angree seemed like you are spinning out of the hole ,in one of ya vids i can here your car spinning shifting to second for a bit ,not trying to talk ya out of anything mate just just play some more before pullin it down ,i was told 080 th for 1 pint of comp good luck

ian, if i shave off .30" it will get me 3/4 of a point, so .040" may get one full point.

dave just double check ryan told me this To gain a point? You'll need to probably take around .080" at least off the heads. Usually can't take that much off an INDY head, the seat depth is too shallow.my heads are cnc-1

ok ian, but why .080", indy days .006" off = 1cc reduction. i have 65cc and need to get to 60cc to get 11.5:1 comp.