Big horsepower 318 builds

How would you build a 500 hp 318-328 vs a 500 hp 408-416 ? Obviously you stated the 302-318 side but what would be the difference for the 408/416?

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Post #204.
That’s a 10:1 410 with mildly reworked Ede heads, tested on pump 93.
The motor got a cam that is very smooth and easy on parts.
539hp
Another 1/2 point of compression and a more aggressive cam and it would have made another 20-25hp.
The best one of those I tested was 589hp. Rpm heads flowing 280.
A subesequent cam change during a freshen up netted 2 tenths lower ET’s(not re-dynoed), so it should have tested at over 600hp.
That engine had an unported Victor on it....... so there was some left in it.

A 500hp 408/416 is a bonafide pump gas street motor with a small enough cam that it can be satisfactorily operated with a streetable converter and gearing.

One of the 416’s we did was very basic.
Flat tops, bowl blended J heads(240-ish), rpm a/g, hp750, small-ish SFT cam(with .842 lobes!!).
Didn’t quite get to 500hp(490’s), but it did make over 500tq.
A little more duration, or maybe a victor intake and I’m sure we could have found another 5-10hp out of it.