I'm taking a b&m supercharger off my 289 and putting on a airgap eblebrock as far as I no I have 8.5 bm blower pistons in my motor will that make a big dift. in performance than if it had 10.0? the heads have big valves and it has a nice cam in it and it has supercomp headers on it which I don't like"they take up to much room",and on the part that faces the motor it says mexico.well anyway do you guys think these blower pistons will work ok for me I already have trouble starting it when its warm,so I didn't really want to go bigger unless its really going to be a big dog.
thanks for any info,
Rick

hey mike can you help me out with this question.

The lower compression will affect the low-end and midrange more than the top end. You may want to do a compression test to see how much cranking compression you've got. This will give you an idea if you are grossly low or not.

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Mike Burch
66 mustang real street
302 4-speed 289 heads
10.63 @ 129.3
http://www.mustangworks.com/cgi-bin/moi-display.cgi?220

How big is the cam? Lots of engines came stock with 8:1 and they run fine (not real screamers, but they crank over, idle and drive no problem). You'll obviously be giving up some power, but I don't think it's gonna make it a total slug unless you've got a pretty big cam.

not sure of the size of the cam I haven't torn the engine down yet.I only removed the supercharger and heads so far.it has a nice lope to it,infact its hard to drive in ist gear across a parking lot.the guy I bought it from said its 524 lift,but I don't no.