1/4 or 1/8 mile car? 1/4
What size wheel and tire will be raced?
Front are skinnys 15x4 with 160/80/15s rear is 15x8 30"x12.5/15s MTs
Exact, if possible compression ratio?
10.2-10.4 depending on which head gasket I go with.
Any porting work on the cylinder heads known? Heads will be home ported/ CNC intake port and bowl openings rest of worked by hand. Polished cambers.Haven't had flowed yet but shooting for 250 at .550-.600 lift.
E.T. sought?
Low 11s is goal but really as fast as I can get with what I have.
Has the block been modified for high rpm usage?
(AKA, blocked oil passages, opened up oil passages? Lifter bores modified, corrected, sleeved?
Not yet still deburring block amd chasing threads. Gonna tube right side lifter valley and fill main to remove step. I have banana groved shafts for rockers and crank has been chamfered. I'll be running a windage tray as well.
I personally don’t know anybody drag racing with the O.D. transmission. Being that Chrysler swapped where 3rd & 4th ride inside the transmission, many feel that the trans is week in overdrive. I myself never had the chance to put the screws to one of those transmissions.
Just considering it as I know guys running them behind big blocks fine. With 4.56 gears would be nice to have the .71 OD. Proabbly run the 65 4speed then swap in OD later to see how it goes but will change the gears for little more even spread.
What is your finish line rpm at?
6400rpm on paper
As far as a cam goes, this is a widely, subjective and highly opinionated subject. A known tire size and compression ratio would help a lot and to a long way.
For simplicity sakes, a solid tappet cam will do the trick.
Now it is IMO that the cam should not only match the engine combo but also the rest of the drivetrain set up with an ET in mind to help select a duration @.050) number to get the operating rpm band where it’s needed.
On lift, knowing where the heads air flow stalls is an excellent help in how much the valve can be lifted. On a race oriented set up, briefly exceeding max flow capabilities is ok and good.
If your looking for a maximum output for maximum speed and lowest ET, a custom cam isn’t a bad idea and a call to a place like Bullet would be of great help and no nonsense. You do need to have your ducks lined up information wise.
Your description above is a good general one but lacks important information needed for best results.
If you want opinions on camshafts just for fun use, you can get them here.
