Help!!!!!

Help!!!!!

Thanks, Rick. Appreciate your comments!

OldmanRick said
A lot to digest, but.....Forged crank is nice, 67cc "J"s sound good...
Now, the most outdated is the Torker 340 intake. And the compression with those pistons is a little steep. The carb will probably end up on the small side considering you want to make enough power to run 12's.

J's are 1.88's....Tony (engine guy) says the smaller valves will help lower end torque. This will be a street motor....albeit a bad-*** one!

OldmanRick said
A Eddy RPM or Weiand Stealth would be much better along with a 750ish cfm carb. A cam with a .050 duration in the 235/245 range will give you the power you're looking for.

Old cam was a hydraulic grind w/ stock valve train (shimmed valve springs on the J's) 4.50/4.75 lift with 298/308 duration. Very lumpy idle but ran very, very strong and the lift was kept low due to the high piston domes.

OldmanRick said
With all that said, the compression ratio has to be brought down if you want to use pump gas. You really need to measure everything, meaning piston to deck height, head gasket cc, along with the 67cc chamber assuming that is correct. Plus any specs on the pistons, compression height and dome displacement. The true measured comp ratio is needed to pick your final cam choice as it will dictate the dynamic comp ratio and the ability to run on pump gas.
Your goal is definitely achievable, just got to get all the ducks in a row. :thumleft:

My plan was to run unleaded premium mixed 15:1 with 100 octane low lead avgas (being in the aviation industry, I have access) to raise the antiknock index (100 low lead has 4X the lead that the leaded premium of the 70's boasted), and barring that, using 104+ octane boost as a substitute. I used to run no vacuum advance with Mr. Gasket quick advance spring kit and total advance set to 32 degrees....timing was usually full advance by 2000-2200 IIRC.....(never had any pinging issues, but back then there was no ethanol, either....)

I notice you had no recommendations on either headers or ignition.