lq4 build for mud truck
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lq4 build for mud truck Hey guys I just dropped in the intro section to say hi.
So far what I have is an lq4 at the machine shop I'm staying standerd bore stock crank stock rods. I did order lq9 pistons, I have a pair of 862 heads and a pair of 317 heads. For a cam I'm wanting to go 230s 240s low 600 lift. What I'm wanting to ask most is if I use the 317 I want to get them down in the 65cc chamber size can I mill them enough without fly cutting? I'm going to attempt my own porting and will be flowed after I'm done
My goal is 500 crank HP and over 400 ft from 3500-5000
So far what I have is an lq4 at the machine shop I'm staying standerd bore stock crank stock rods. I did order lq9 pistons, I have a pair of 862 heads and a pair of 317 heads. For a cam I'm wanting to go 230s 240s low 600 lift. What I'm wanting to ask most is if I use the 317 I want to get them down in the 65cc chamber size can I mill them enough without fly cutting? I'm going to attempt my own porting and will be flowed after I'm done
My goal is 500 crank HP and over 400 ft from 3500-5000
It's easier to flycut out of the engine. Take the pistons to a machine shop and let them do it... though you may want to mock up your heads to the block and put the piston in there to make sure the valves are centered correctly on the piston. If the machine shop has everything, they can do that too.
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What do you guys think would be a safe depth to fly cut being as I haven't decided on cam yet. Once I've got my final cr I'll decide cam but I'm worried the flat tops might cut me back on my duration if I don't fly cut. I want to say I read somewhere on here just recently .080 is a good number for intake and .060 for exhaust
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I would also suggest having a valve job cut in the 862's and swapping in the larger valves from the 317 heads and picking up some flow as well.
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I agree, except I think you'll gain more than 3/4 of a point. I calculated 10.2:1 with the 72cc chambers in the 317 heads and 11.5:1 with the 61cc chambers in the 862 heads.
I would also suggest having a valve job cut in the 862's and swapping in the larger valves from the 317 heads and picking up some flow as well.
I would also suggest having a valve job cut in the 862's and swapping in the larger valves from the 317 heads and picking up some flow as well.
