Build your engine and use your double humps and preferred cam. Look at the money guys pour into a ford Y block or a buick nailhead ect. However this is the Hamb and guys will spend lots of effort to use inferior obsolete parts. And I have a set of the old cal custom finned aluminum stagger bolt valve covers That I bought when I was a kid and wanted to use them. I used them because they came on the first 55 chevy I bought. I installed a old set of 57 powerpacks on my 69 327 engine. For Me Its all about not spending a lot of money and having fun. A 30-30 cam will work with a stock valve train and not collide the valves with the pistons. I use the old C3B edelbrock or Z28 dual plane intakes. With a decent gear in the car this will run hard. I've built basically this same combination at least 20 times, solid street small block, sounds great, performs well. There's a lot better cams out there than the 30-30 that was designed for sustained rpm on a 283 when the valve trains available were basically shit.Īt 470 to 480 lift you can run the Z28 rebuilder springs and be ok, it's a gamble on pressed in studs, you can pin them or install screw ins. Holley 650 double pumper, presmog Qjet, holley vac sec are all good choices in this range and really depends on how you want it drive it, performer to performer rpm style intake, again depends on how you will drive. If you're running an auto with a stock converter back the duration off to the high 220's and lift will be around 465-470. If youre running an auto that combo will like a 2500 stall. Look for a cam in the 480 lift range, adv duration in the mid 230's. If you can get 10-1 or even 9.5-1 out of the Pistons you have you'll be ok. There's plenty on the Web on where to do a "little" grinding on the double humps to get the best out of them. So a 355 with double humps and flattops, if you can deck the block to get your compression up, a lot of rebuilder flattops are even farther in the hole than stock, measure your piston compression height and see where you're at. They will get the job done, as a point of reference the iron vortec heads with stock valves will make more power with less cam. Everything I found with double humps over the years is beat. If you can get a set of double humps with 202 valves that has good seats and tight guides for $300, sure run them.
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