need some help building a motor
05-06-2015, 09:42 AM
#1
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need some help building a motor okay guys i need some advice. this is my first pushrod build.
it's going into a 1991 nissan 240sx. dont worry did all the work to handle a little more weight. here is the motor i picked up lm4 leaving it stock with the exception of ls1 intake.
Now there is not a lot of info out on this motor. what kinda numbers do you think this motor can handle in stock form. whats going to be a weak point of it?
What i plan on doing is 799 heads with dual valve springs, valves, port job, and a mild cam.
Over the winter i wanted to do 5858 twin turbo setup but wanna make sure the block will hold like 650hp. and advice is appreciated.
it's going into a 1991 nissan 240sx. dont worry did all the work to handle a little more weight. here is the motor i picked up lm4 leaving it stock with the exception of ls1 intake.
Now there is not a lot of info out on this motor. what kinda numbers do you think this motor can handle in stock form. whats going to be a weak point of it?
What i plan on doing is 799 heads with dual valve springs, valves, port job, and a mild cam.
Over the winter i wanted to do 5858 twin turbo setup but wanna make sure the block will hold like 650hp. and advice is appreciated.
05-08-2015, 11:09 AM
#2
Welcome.
What heads are on the motor now ? Do you plan to forge the bottom end for your turbo project or run it stock ? The block and crank will handle 800+ hp, rods and pistons will be the weak link. You could push the stock bottom end to the 600 hp mark with some good fuel and a conservative tune. What other info are you looking for with this motor ? Biggest difference the LM4 has VS the other 5.3L LS motors is the oil pan made for the 4WD SUV's. Other than that it's pretty much the same.
What heads are on the motor now ? Do you plan to forge the bottom end for your turbo project or run it stock ? The block and crank will handle 800+ hp, rods and pistons will be the weak link. You could push the stock bottom end to the 600 hp mark with some good fuel and a conservative tune. What other info are you looking for with this motor ? Biggest difference the LM4 has VS the other 5.3L LS motors is the oil pan made for the 4WD SUV's. Other than that it's pretty much the same.
