More Power! 4.3L

[rlith]

Originally Posted by smoothchev

Yeah. I still have my cat. Actually my truck has two. Even with no muffler, the exhaust isn't very loud at all. As for the torque curve: mine is now much more even. I'm sure you may know how "torky" the 4.3L is. With the cold air intake and the exhaust done, my low end torque is a little less, but the engine pulls a lot better now in the higher RPMs. I think a power programmer would really open her up, but i don't have that kind of cash, right now al least.

You only have 1 Cat, the other is a resonator... Just thought I'd point that out.,.

[smoothchev]

You're right bro. I ordered some power pulleys from Summit that I need to put on. I am curious to see how much that helps. I am also trying to bump up my mileage, too. I've already had to take out a second morgatge on my house to fill my tank last week. ;-) ROTFL

[dmbrisket 51]

if you wanna gain some miles, put an e fan on it

[Jerry80871852]

When I was a teenager, that was a lng time ago, had a friend who always had the best and fastest cars, all one had to do is ask him and he would tell you his was the best and the fastest!

For some reason he did not win all of his drag races, but he would still claim that his was the best & fastest!

I suppose they be one like him in ever town!

[smoothchev]

Originally Posted by dmbrisket 51

if you wanna gain some miles, put an e fan on it

That is next in line. I'm thinking of going with a perma-cool (Jegs part #771-19115). It seems to have the most CFM. And it doesn't have a shroud. Has anybody ran one of these fans? or similar??

[dmbrisket 51]

i suggest a fan from a torus, will be the cheapest from a j yard, you wont need to turn a lot of air, your not in a muscle car thats putten out a grand for horses

[rlith]

Originally Posted by smoothchev

That is next in line. I'm thinking of going with a perma-cool (Jegs part #771-19115). It seems to have the most CFM. And it doesn't have a shroud. Has anybody ran one of these fans? or similar??

Go with a ford taurus 3.8 e-fan, much cheaper (35 bux) and runs at 2800 cfm on low, 3600 cfm on hight and allows you to use your stock shroud...

[smoothchev]

That much air???? The highest aftermarket fan I could find in Jeg's or Summit was the one mentioned above. 2900CFM, 16" Perma-cool. And I still have to buy the thermostat for it, also.

[rlith]

Originally Posted by smoothchev

That much air???? The highest aftermarket fan I could find in Jeg's or Summit was the one mentioned above. 2900CFM, 16" Perma-cool. And I still have to buy the thermostat for it, also.

Standard hayden thermostat switch which does well runs about 15 bux at most autoparts stores.

[smoothchev]

all rightey... I've done some mileage calcs, and i'm now getting 23MPG in town! not bad. That is with a set of power pulleys that I isntalled. Out of everything I've done to my truck, they seemed to make the biggest difference. They pumped up the HP a little, too. The only thind i don't like about the pulleys is my alt doesn't produce enough power at idle with the stereo on anymore. Not a big problem, but a little bothersome.

[smokey041369]

i was talking to a guy about getting more power out of the 4.3 and he said talk to someone that builds motors for a living, cause you should be able to bore the motor to put 350 pistons in it.

going to talk to a friend that does racing motors tonight will post his reply about doing this

[herkyhawki]

Originally Posted by smokey041369

i was talking to a guy about getting more power out of the 4.3 and he said talk to someone that builds motors for a living, cause you should be able to bore the motor to put 350 pistons in it.

going to talk to a friend that does racing motors tonight will post his reply about doing this

The pistons in your 4.3 are already the same size (4" diameter) as those in a 350. This is exactly what GM did to make the 4.3 -take a 350 and chop out two cylinders.
350cu.inch = 5.7 Liter.
5.7L / 8 cyl = .713 Liter per cylinder.
Then take .713 Liter x 6 = 4.3 Liter.
So , What's your point?

[dmbrisket 51]

you CAN get from what ive been told up to and over 500 ponies out of a 4.3, think base, start with your bloc, flat top or domed pistons, i personally would go flat top 350 pistons with 4 way relief valvs, call up GM, Comp Cams or Crain cam and tell them EXATLY what you have and what your intentions are, they need to know every thing from break style (ie drums in back or 4 wheel disk) tire/rim size, radio size, e fan or clutch style, if you dont mind lobe, they can give you even more power, have the heads port n' polished, have the heads gasket matched, and machined so there is no difference in hole size in either intake or exhaust ports, put either a turbo or blower onto it, 5 speed manual transmission, race setup, not the stock 8" (or whatever it is) flywheel, if you put big bucks into your 4.3 you can make her scoot, and the advantage is, the stroke cycle will never be long enough to sound like an 8, so you could blow that mid 80's monty away at the stoplights and all they will think is, damn i got beat by a 6 cyl.

[herkyhawki]

Wow DMB..51, You've got a Vision.
Don't forget, NONE of that extra power will help you "blow that mid 80's monty away at the stoplights" unless you tub it and put in a narrow rear end with FAT tires. Even a stock Blazer has traction problems in an off-the-line race.

[dmbrisket 51]

my vision is a 350 on a stand in my garauge... im just saying it is possible