I'm pulling apart the 505 this winter for a health check. No issues with it but after beating on it fairly regularly, I'm thinking I should give things a once-over.
While It's apart I'm putting in .027 Cometic head gaskets to replace the .060. It should bump compression up near 11:1. Hoping to gain around 30 HP or so from the change.
I will probably upgrade the main fuel line and pickup in the tank to 3/8" as well while the engine is out.
Goals are:
10.99 N/A 9.99 with the 250 shot Drive it to the track and home.
All through the mufflers and on street tires. The pump gas thing may be out the window.
Have you considered E85? changes sound good....Just be careful approaching that 300 threshold, it may like more retard than you expect. It all depends on how early the exhaust is opening. Just for comparison i would do a cranking compression test now, and after the changes. Then pump it every time you race. You will really be able to keep track of the engines "health" that way
I considered E85 when I first built the engine and talked myself out of it. Availability, hassle, larger fuel system, etc.
Very good idea on the compression check!
I would stay away from race fuel since you street drive. Race fuel is a hassle just keeping jugs filled and or dealing with buying in a drum.
I'm going from 10.3 to 11:1. It ran fine with the cheapest pump gas before at 36° total timing. I have stations that carry 91 octane fuel so that coupled with the fact I can pull timing with the turn of a dial, I'm sure it will be fine. The race gas will be in the nitrous stand alone cell (and maybe a little in the main tank) for those nights that I'm e.t. chasing at the track. Cometics are re-usable so if I don't like the higher compression, I'll just swap back to the .060 gaskets.
'63 Dodge 330 11.19 @ 121 mph Pump gas, n/a, through the mufflers on street tires with 3.54's. 3,600 lbs. 10.01 @ 133mph with a 250 shot of nitrous an a splash of race gas. 1.36 60 ft. 3,700 lbs.
