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Cleveland heads

General engine tech -- Drag Racing to Circle Track

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Steve.k
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Re: Cleveland heads

Post by Steve.k »

That first head flow chart was on 408 cube motor and made 550hp @ 6200rpm. It was cammed to make tq early for big bronco mud truck turning 38”
Mudders.This class also has a vaccum rule, it has to pull 14” at 1500rpm.
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Re: Cleveland heads

Post by fordified »

Steve.k wrote: Tue Nov 10, 2020 9:38 am
cgarb wrote: Tue Nov 10, 2020 1:00 am With those stuffers or plates in the intake what happens when you flow with the intake on? I wondered how that effects the fuel distribution running into that flat edge at the bottom of the port.
This prostock head has intake epoxied also. They were trying to turn the flow to center of cylinder not fill the port. If you look on my flow sheet you will see the port volume filled is actually bigger than the ported head. The misconception was they were making port smaller. For what you want to accomplish a port job is more than adequate. Filling the head in my eyes is a waste of time unless your trying to accomplish what the prostock guys were.You have to realize the prostock motor was 343 cubes and was shifted at 9800 rpm.
Pro stock Cleveland’s were 70’s technology. Every superstock engine I’ve seen since 2000 has ports filled and they are much smaller. They all use a Yates intake. The guys who run the closed chamber heads run 8’s and make peak around 8500 rpm. The guys who run open chamber heads run in high 9’s and low 10’s because they have no compression.

The superstock heads look nothing like those pro stock heads.

The op posted that the engine is for drag racing and the car picked up when the plate were installed.

The Aussie heads used to be the ticket. Closed chamber heads with big valves and small ports.
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Re: Cleveland heads

Post by fordified »

Here's a set of heads that we've been working on. They flow almost 370 at .800.

I've included a picture of the ports compared to a yates heads with a lot of work done. The Yates heads have smaller ports and flow 390 CFM at .800 with a 2.150 valve
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Steve.k
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Re: Cleveland heads

Post by Steve.k »

Very interesting. Thanks for posting. I did not know they were allowed to do this in ss class. So the end result is to get head very close to a3 design or newer yates design. I have a set of stock e heads here that flow in the 350cfm with no porting once so ever. All works done in seat.
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Re: Cleveland heads

Post by Steve.k »

AED51257-CBC0-4C9F-B851-1F6C940AA4F8.png
This is the stock E head. No porting once so ever. Very trick seat work
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Re: Cleveland heads

Post by fordified »

You can go under cc in the ports but not over. They changed the rule about 15 years ago to allow chamber work but they have to meet stock cc.
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Re: Cleveland heads

Post by fordified »

Steve.k wrote: Tue Nov 10, 2020 10:49 am AED51257-CBC0-4C9F-B851-1F6C940AA4F8.png
This is the stock E head. No porting once so ever. Very trick seat work
That’s cool. Stock eliminator requires a lot of time on the seat. You can now blend the seat down to the top of the guide boss.

Almost everybody does coverup porting and has done it fir decades.

The great thing about superstock is that you can change the port design by filling both intake and exhaust.

CFM is import but port shape and velocity is everything in drag racing.
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Re: Cleveland heads

Post by Steve.k »

8BFF3EA3-8346-4CC3-A931-1C2177DA4C32.png
Here is stock E chamber. That’s interesting. Im not sure what class original poster is in.I guess it depends where he wants to go. A quick port job will pick him up a fair bit.
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Re: Cleveland heads

Post by fordified »

No doubt about. I figured that if he was going to do some porting he may want to fill the ports. He can always do that later and see if he picks up.
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Re: Cleveland heads

Post by SupStk »

Steve.k wrote: Tue Nov 10, 2020 10:49 am AED51257-CBC0-4C9F-B851-1F6C940AA4F8.png
This is the stock E head. No porting once so ever. Very trick seat work
Interesting, are Ti valves allowed in SS?
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Re: Cleveland heads

Post by fordified »

Not unless they came with them. You can in Modified though.
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Re: Cleveland heads

Post by SupStk »

fordified wrote: Tue Nov 10, 2020 11:10 am Not unless they came with them. You can in Modified though.
Check out the weights listed in the flow sheet. The intake is less than 1/2 of a stainless.
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Re: Cleveland heads

Post by Steve.k »

Are you guys doing anything special to blocks? What kind od hp you seeing? Must be close to 650-700
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Re: Cleveland heads

Post by fordified »

You have good eyes. I didn’t see that.
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Re: Cleveland heads

Post by fordified »

Steve.k wrote: Tue Nov 10, 2020 11:15 am Are you guys doing anything special to blocks? What kind od hp you seeing? Must be close to 650-700
Aftermarket block and good steel crank. No billets.
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