HEy guys. I have a spare 99 4.3L vortec efi motor just laying around and a complete rebuild kit with flat tops for a 350 small block. Now I was wondering If I rebuild this top to bottom and not really put big bucks but spend the cash where it counts would it be possible to get 7000rpm out of it with a 650cfm carb?

I plan to port and polish the heads and port the intake and do what ever to get 7k out of it.

My question is, does any one where or if there are front sump oil pans for this motor or would i have to buy one cut it and mod the oil pickup tube to make it work? I want to drop this sucker in my 86' corolla with either a th350 or a t56 cuz I love 6 gears. Anyway any advise on building this motor?

 

the most you'll get out of that thing is 6000. those motors are made for torque...

 

I would boost that bitch to the sky Ive heard good things about those and turbos

 

I would say you can do it if you have a good bottom end built,and a cam that will allow you to turn that high. I have seen those motors in "eco-dragsters" outrun big blocks. The bore and stroke is the same as a 350, just 2 cylinders less. Then you could turbo that thing like 02sierra said.

seth

 

im hoping in about a year to MAYBE rev my 4.8 to 7k

 

The vortec heads on that motor will only suppport about 6000rpm with a fairly large cam. The biggest comp makes is a 210/215 500/510 on a 114. Crane makes one a little bigger with a 112lsa that should rev to 6k with some nice work to the stock heads. Anything beyond that and it will be time to move on to GM perf. 18 heads intake and vavletrain.

 

As for the front sump, I don't think you could do it. It has the same oil pump config that a small block has, were the oil pump bolts to the rear main and sticks down into the sump. To make it a front sump, you would have to do some sort of a external pump, like a dry sump would have. Not easy, but do-able.

 

lol, you beat me to it.

the cam and heads are what's holding you back, not the bottom end. the 4.3L is built for fuel milage, not torque. the torque comes naturally due to it's size. it is one of the largest 6 cylinders out there. it could be topped in torque without too much work with the same size. if you run a 4.3 and want power, add boost or nitrous.

 

well if the 4.3 is built for fuel mileage then why does my big v8 get better?

 

lol yeah, i get 19mpg in my truck, my dads 00 ext cab 5.3 got 15...lol i get 18mpg city and getting on it a little...he drove 30 miles a day highway and i got better than him