|
Re: 1968 c10 396
Quote:
Originally Posted by Steeveedee
I had an RA III 400 in a '66 Le Mans (obviously a transplant, as it had a 326 originally). The compression ratio for that engine was advertised as 11:1. Don't know if that was true for this particular engine, but it had 210-230 PSI for cranking compression. Even with the good grades of gas you could buy back then (mid-'70s) it wasn't really happy unless I put in an octane booster. I had a compression tester that you would put against the plug hole, and it split the rubber fitting. I had to go and buy a gauge that screwed into the plug hole, and had an o-ring for a seal. You can get a reasonable number for the compression ratio by looking at the numbers, but if the engine is really worn, it might not help.
|
It sounds like someone may have done some head swapping and you ended up with a higher than advertised compression ratio.
__________________
Thanks to Bob and Jeanie and everyone else at Superior Performance for all their great help. 
RIP Bob Parks.
1967 Burban (the WMB),1988 S10 Blazer (the Stink10 II),1969 GTO (the Goat), 1970 Javelin, 1952 F2 Ford OHC six 4X4, 29 Model A, 72 Firebird (the DBP Bird). 85 Alfa Romeo
If it breaks I didn't want it in the first place
The WMB repair thread http://67-72chevytrucks.com/vboard/s...d.php?t=698377
|