Inputs on a home built 318 for red light to red light fun
If I read the OP correctly, he's wanting to build his car for stop light to stop light fun. His combination is off. He wants a cam that will let him spin the 318 to 7,500 rpm's, the cylinder heads just won't support that rpm, neither will those 273 rocker arms.
Actually these parts will. They have nothing to do with rpm. What these parts have to do with is; Heads, moving the air. The valve springs control the valves which are rpm limited due to design or weight of the valve. Rocker arms have there job as well which there not a limiting factor on rpm ether. As long as there constantly oiled, they work.
He has a heavy crankshaft, rocker arms.
The weight of the crankshaft is not a limitation to rpm but a limitation on how fast it will spin from idle to max rpm. The weight of the rockers can limit valve control at some point if the spring can not control them. OEM rockers have turned these rpm’s before.
No mention of a intake manifold either but he will need a single plane.
The intake can be rpm limited in terms of making power. But if the engine otherwise can turn 7500-8500, the intake is still moving the air. Power wise, yes, a single plane is better and hence why I posted the tunnel ram.
If he was to build it with the parts that he listed I think that the car would be a dog off the line. A 3.91 or even those 4.30 gears are going to make that 318 scream at cruising speeds.
This is a broad statement and you can not actually predict this since the specifics of the build are far far from being listed and have a ton of unknowns not to mention what your saying, “A dog off the line” is part of the way it’s built and a known factor with exception to the gear ratio mention which is wrong. The increased axle ratio is done so as to release more torque to ease driving and release more power quicker to accelerate best.
Besides, what’s cruising speeds on the boulevard when that could only be 30-40mph? It’s not the facet goal, just a minor requirement in order to get there.
I knew a guy that had a 383 with a 1050 Holley denominator and it was a dog off the line, carb was to big. He put a 850 on it and it ran great.
Not so sorry to hear you know of a guy that can’t tune a carb. Sorry to read you use him as a end all example.
I may not have the years experience that most on here have but I do know that he's combination is as mismatched as it can be.
His combo is a question he brought forth as a parts list seeking help. I have a (jokingly funny) description of what he sounded like. Re read my posts.
Your lack of experience shows and that’s OK.
Giving advice with a lack of experience, I don’t think that’s wise.
Giving advice due to others experience is not good ether but a mention of someone else’s been there and done that experience should at least be mentioned as such and not a bar that was set. Just a report on how they did with it would be good.
