engine quesions

ct1979 · January 22nd, 2007, 11:31 AM

What should the compression check be on at '69 350. Mine is stock.
Also what would the ideal vacuum pressure be at idle?

70Wcars · January 23rd, 2007, 01:26 PM

Lots of variables on an older motor, but look for compression no lower than 120 on a motor still tight enough to run well...Vac. depends on cam, but a stock set up should be 15 or more inches merc. and steady if no leaks...

Dan S.

ct1979 · January 23rd, 2007, 03:14 PM

Thanks! I am getting a very steady 19 on the vacuum gauge. I may just wait on the rebuild I was thinking about as long as the compression seems good. It was lower but some small carb adjustments brought it up and smoothed it out.

January 22nd, 2007, 11:31 AM	#1 (permalink)
ct1979 Member Join Date: May 2006 Location: Fort Worth, TX Posts: 25	engine quesions What should the compression check be on at '69 350. Mine is stock. Also what would the ideal vacuum pressure be at idle?

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January 23rd, 2007, 01:26 PM	#2 (permalink)
70Wcars Registered User Join Date: Jan 2007 Location: Texas Posts: 64	Lots of variables on an older motor, but look for compression no lower than 120 on a motor still tight enough to run well...Vac. depends on cam, but a stock set up should be 15 or more inches merc. and steady if no leaks... Dan S.

January 23rd, 2007, 03:14 PM	#3 (permalink)
ct1979 Member Join Date: May 2006 Location: Fort Worth, TX Posts: 25	Thanks! I am getting a very steady 19 on the vacuum gauge. I may just wait on the rebuild I was thinking about as long as the compression seems good. It was lower but some small carb adjustments brought it up and smoothed it out.