i wish you could have lopey idle at the same time, but i guess ill have to save that for maybe a different project down the road.īy the way, the cams can go higher than the speed listed, just with bad efficiency, right? i remember using the all stock motor to hit 60 in first gear once too try and blow the old motor and made it sound like an indy car and it didnt blow up or anything as far as i know lol.†Parts and labor warranty when installed by a GM Dealer or qualified installing independent Service Center (ISC) or when sold over the counter and REPAIRED by a GM Dealer or qualifying ISC. yeah the dude at my work seems to have mostly "book smarts" and doesnt have much to show for it other than a pile of crap ford aerostar van lol. the best i could get with my 400 was about 12 mpg city which prolly aint bad but could be a lot better for how small the engine is. that lockup converter looks pretty appealing as well. I saw an ad in my local thrifty nickel for rebuilt turbo 400's for 250 bucks and 700R4's for about 500 bucks, so i might as well chip in the extra 250 bucks and it will pay for itself in mileage.
i was looking into the whole 700R4 thing and it looks like a great thing to have. Making solid power all the way to 5500 won’t give you bragging rights, but it will give you a lot of midrange torque, and enough lowend response to really move that beast. I’ve had plenty of stock chevy V8s that were completely useless to rev past 5000. A lot of older stock SB Chevy cams were only really good to about 4500 rpm. Take a look at stock replacement camshafts sometime. Part of the reason that a modern 5.7L Z28 can hang with a 1960’s bigblock Chevelle (While redlining at only around 5700 rpm) is because of technology- and definitely not because of a bigger camshaft.Ī 1000-5500 powerband is totally respectable.
If you’re looking to invest a little more in your motor, a well engineered roller camshaft, followers, and higher lift roller rocker arms will give you more torque and HP- in the low and mid-range where you really need it. Unless the rest of your motor (heads, intake, carb, compression, exhaust) is set up to also make higher RPM horsepower, all that a bigger cam will get you is lousy throttle response, a little bit of midrange, the ability to rev more on the top end while not really making any more power- oh and horrible gas mileage.Ĭombine a small-block motor like that in a heavy vehicle with a stock rear diff ratio, and you’ve got a sluggish, gas-guzzling noisemaker.Ī best bet would be to buy an entire valvetrain that will maximize the capabilities of the setup that you have.
Just a bigger cam won’t neccessarily give you any more power for that big vehicle.
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