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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

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Pm sent
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Re: Cleveland heads

Post by Steve.k »

7E01DA62-861B-4FA2-ABF7-55D6E1048903.png
Cgarb the numbers i sent you im not sure if they for the copper berilium seats or steel. We did one set with steel also.Here is the flow. Notice the flow drops off on .700-.800. We got greedy on short turn and it drops off.
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1972ho
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Re: Cleveland heads

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Re: Cleveland heads

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Re: Cleveland heads

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Could you repost for those of us that don't use facebook?
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1972ho
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Re: Cleveland heads

Post by 1972ho »

I’ve tried to copy the pictures and it won’t let me down load them and I’m not sure how get them,but it is a 1968 cleveland Indy car motor with 5 bolt per cylinder in the block,Boss head with different type of ports they are saying it is a Smokey design fresh sheet cleveland with block with Boss 302 heads for trans Am racing.
Steve.k
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Re: Cleveland heads

Post by Steve.k »

I think smokey was working on a version of the tunnel port 302 also
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Kazoom
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Re: Cleveland heads

Post by Kazoom »

SupStk wrote: Thu Nov 12, 2020 10:05 pm Could you repost for those of us that don't use facebook?
> https://www.corral.net/threads/boss-tra ... t-17781058 <
!Grab em by the p*ssy!... !TRUMP FOR LIFE! ...!make America Grab again!
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Re: Cleveland heads

Post by RWadley »

Australian Clevo heads are closed and open chamber with 4 V and 2 V ports.
We have found that lowering the exhaust port to obtain a straight outlet, boring the intake runners, inserting ssteel valve stems and using 4 V valves gives a head with capacity to create 600 hp on a good bottom end.
Once again the Ford GT had the big heads in cars capable of 160mph in 1973
1973 XA GT RPO 83 hardtop Ford Falcon
KnightEngines
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Re: Cleveland heads

Post by KnightEngines »

RWadley wrote: Mon Nov 16, 2020 4:44 am Australian Clevo heads are closed and open chamber with 4 V and 2 V ports.
We have found that lowering the exhaust port to obtain a straight outlet, boring the intake runners, inserting ssteel valve stems and using 4 V valves gives a head with capacity to create 600 hp on a good bottom end.
Once again the Ford GT had the big heads in cars capable of 160mph in 1973
1973 XA GT RPO 83 hardtop Ford Falcon
Nope, 4v valves in a 2v head means you cannot get the short turn right without hitting water.
Max valve size in a 2v if you want it to work is 2.08, 2.055" is better.
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Re: Cleveland heads

Post by KnightEngines »

Aussie 2v clevo head with a 2.055" valve & 50 deg seat, r&d project.
20200622_180704.jpg
20200622_180838.jpg
20200622_180901.jpg
20200622_180909.jpg
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bob460
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Re: Cleveland heads

Post by bob460 »

Kazoom wrote: Fri Nov 13, 2020 11:37 pm
SupStk wrote: Thu Nov 12, 2020 10:05 pm Could you repost for those of us that don't use facebook?
> https://www.corral.net/threads/boss-tra ... t-17781058 <
WOW.............talk about pushrod "X" factor.......lol...........never seen that before.......cool pics.
Steve.k
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Re: Cleveland heads

Post by Steve.k »

KnightEngines wrote: Mon Nov 16, 2020 6:19 am Aussie 2v clevo head with a 2.055" valve & 50 deg seat, r&d project.
20200622_180704.jpg
20200622_180838.jpg
20200622_180901.jpg
20200622_180909.jpg
Yes ive tried the 2.19 valve seat trick on 2v head but it doesn’t work. Hit water. These seats we use in the stock elim trick are considerably wider mind you.
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Re: Cleveland heads

Post by cgarb »

image000000_01.jpg
This is what I have done with the porting. No valve seat work yet, waiting on the valves. I used a valve seal cutter to trim the guide bosses down to .531 as far as I could and then used the ball carbide to blend as far as I could. I blended the chamber and polished it up a little with a stone. I removed as much material as I could from the chamber wall around the exhaust valve without getting into the head gasket sealing area. Took out the lips and edges mainly and rounded the short turn over to get a smooth radius and not a sharp edge. No other work in the intake or exhaust port, just the bowl area.
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Re: Cleveland heads

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