70 454 compression
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Heel & Toe
Joined: May 2007
Posts: 19
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70 454 compression
Recently purchased a 70 454; my first Vette, original engine with one rebuild I know of. I brought into a shop here in Houston "Bombera's" to get some work done on the carb. They noticed the engine did not sound right after the carb work. They did a compression & leak test which came back:
Cyl #2 95 PSI @42%
Cyl #4 0 PSI @90%
Cyl #6 85 PSI @30%
Cyl #8 90 PSI @50%
The shop thinks it's either a valve or a valve and piston. I've been getting some pretty high $$$ quoted to me for either repair.
So, any feedback on those impressive numbers, (although when I drive the car it seems to run fine to me; maybe never having driven a 454 Vette before is the reason why). And any feedback on what would be a reasonable cost to do either?
Thanks,
Paul
Cyl #2 95 PSI @42%
Cyl #4 0 PSI @90%
Cyl #6 85 PSI @30%
Cyl #8 90 PSI @50%
The shop thinks it's either a valve or a valve and piston. I've been getting some pretty high $$$ quoted to me for either repair.
So, any feedback on those impressive numbers, (although when I drive the car it seems to run fine to me; maybe never having driven a 454 Vette before is the reason why). And any feedback on what would be a reasonable cost to do either?
Thanks,
Paul
Melting Slicks
Joined: Dec 2005
Posts: 2,441
Likes: 0
If those numbers are correct there is something wrong with those cylinders.
Take it to another shop for a second opinion, or if you can take a reading yourself do it on at least one or two of those cylinders in trouble to verify the readings.
Big engines can mask quite a few problems due to their size, a zero reading in a cylinder would be noticeable though, as if a plug wire were disconnected.
Take it to another shop for a second opinion, or if you can take a reading yourself do it on at least one or two of those cylinders in trouble to verify the readings.
Big engines can mask quite a few problems due to their size, a zero reading in a cylinder would be noticeable though, as if a plug wire were disconnected.
Last edited by shafrs3; Jun 24, 2007 at 08:53 PM.
