The V8 Owners Forum -

How did you get on with this project? LM7 [GM Gen III 5.3 V8] considered to be one of the least troublesome V8 engines on the planet. Better reliability record and lower customer problems than Merc and BMW types. Perfect replacement for the old Rover V8. You can buy the 4.8 (LR4) for about $400 from...

Interesting, so they are basically 4 clicks down- or is that offset by the different units used? What does the R and M stand for, and is any 1 more accurate than another or are they just different like farenheight, celcius, centegrade etc? It's the difference between the Research Octane Number and ...

Castrol,

Make a good oil specifically for the older pushrod engines....

http://www.castrol.com/castrol/productd ... Id=7013363

http://www.castrol.com/liveassets/bp_in ... 969_05.pdf

"The US do not use MON at the pump, they use pump octane number. "

This is correct,

They add RON + MON then divide by 2 = PON

90RON = 86 (PON, USA)
92RON = 88
95RON = 91
96RON = 92
98RON = 94