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 Post subject: 752 hp 408 Cleveland
PostPosted: Sat Apr 14, 2018 9:08 am 
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So 408 has sat all winter. I took off the 1 3/4 inch black widow spacer. The engines seems to be a different beast, response as hell. Scott Cook told me that he built the spacer in place. Wonder how that would change dyno numbers? Seems with spacer too much plenum volume. Guys down under told me they had same experience. Dustin Rhine said he used a Rherer- Morrison shear plate. I know nothing about them. I will test both at track in 14 days. Just put in new cam lock belts, and quick release steering wheel. First is with 34 degrees timing and second is with 32. Before it really was not as crisp. and if I went to 32 degrees ran like lazy. Now you can see for yourself. there are other vids of with spacer.

https://youtu.be/Cg3dbFfFzz4

https://youtu.be/0Wu5wpgxmU0

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 Post subject: Re: 752 hp 408 Cleveland
PostPosted: Sat Apr 14, 2018 10:27 am 
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Good numbers, sir.

Your best bet is to see what it likes at the track. I've made peak horsepower with lower timing before, but found it to be lazy at the track. Just gotta experiment.

Too much plenum volume sounds like a logical explanation. It would probably work with more rpm or a larger engine and you may not even notice a difference at WOT.

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 Post subject: Re: 752 hp 408 Cleveland
PostPosted: Sat Apr 14, 2018 12:08 pm 
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Brent, your right the track will tell the truth. I have found a tenth in 60 ft, by using a 1 inch 4 hole and 1 inch super sucker with my old 385ci. The timing is rock solid, always seems to be a little shaky before. I took a vid, can read it as clear as day, technology is great. I mounted 2 action cams to get all the action, remote control. What do you know about shear plates Brent?

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 Post subject: Re: 752 hp 408 Cleveland
PostPosted: Sat Apr 14, 2018 12:36 pm 
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Shear plates serve a couple of purposes. They add a little more plenum volume, but IMO their main purpose is that they are anti-reversion plates. On cams with lots of overlap, you can get exhaust back up the intake valve, which can be counterproductive. The little lips that stick down into the plenum are basically guards that work to keep that from happening.

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 Post subject: Re: 752 hp 408 Cleveland
PostPosted: Sat Apr 14, 2018 4:55 pm 
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Cool, I thought the same for the most part. Once I get a baseline, and does not blow up, good to go to see what happens with changes, ck with spacers, super sucker, previous spacer. Have a nice ported TFC 4v intake, that would be fun to see what that change does. One guy from down under, said they lost 18hp with that spacer, makes me wonder what it would have made without the spacer...

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 Post subject: Re: 752 hp 408 Cleveland
PostPosted: Sat Apr 14, 2018 5:00 pm 
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Yep, it's all individual-engine-dependent. Never know until you try. Good thing about the Cleveland is that you can swap intakes in a heart beat.

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 Post subject: Re: 752 hp 408 Cleveland
PostPosted: Sun Apr 15, 2018 10:39 am 
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I do like that dry intake. Here is one you don't see often. May try this too. The one compares the ford motorsport I used to run.

Image
Image
Image

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Last edited by DragBoss on Sun Apr 15, 2018 10:44 am, edited 1 time in total.

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 Post subject: Re: 752 hp 408 Cleveland
PostPosted: Sun Apr 15, 2018 10:41 am 
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Yikes big pics

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