Originally Posted By: Ramblejam
Specifically, what is your involvement with this race car? Owner, driver, one of a few mechanics.
Originally Posted By: SJ073
sorry - Castrol GTX 20w50
I stand by the recommendation of Mobil 1 15w-50. When purchased in 5 quart jugs at Walmart, it's very inexpensive, and is matched well to this engine. Have had good luck using this oil in my drag cars and will consider it. Have also had real good luck and finished lots of long races with Castrol.
Originally Posted By: SJ073
I do my best not to leave it above 5K in the interest of saving the motor but 3-4K sustained during races conditions is normal.
Then I have no idea why you're running race fuel, let alone leaded. Get high octane/premium pump gas from a top station (Shell, Chevron, Texaco).
For those prolonged wide open stretches over dry lake beds where you can pin it. This motor is tuned for pump gas but I add it for insurance. That and a little race gas helps the fuel bladder live longer.