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We had just finished installing a 440 in my friends' '65 Coronet. We pulled his 383 that ran a best of 12.5 something. Using the same cam, heads, carb, headers and drivetrain, we were looking for at least a .5 decrease in ET. The car ran the same as with the 383. We picked up .3 only when we dropped the exhaust at the collectors. It has a 3500 stall converter, 4.30 gears and 28" tall slick. The car launches a lot better, but seems to slow down from around half track on. I'm thinking this thing should be 60'ing in the low 1.6 range instead of 1.7-1.8 and running at least low 12's to high 11's. Any suggestions?

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Several thnings, on the cam did you install it at the same lobe centers on the 440 Or did you advance, retard or just stick it in on the dots If you guys just stuck it in you need to degree it or at least check and set the intake lobe centers Second thing ,what do the spark plugs look like now from the 440, if you put new ones in Lots of ways to slow cars down, even when your not trying to do that Let us know what you find and do to correct it