chevyivar
Contributor
Posts: 163
Age: 41
Loc: Norway
Reg: 08-30-12
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01-08-22 04:02 PM - Post#2834150
Hi guys.
I have a 235 that im rebuilding, it came with a 261 head.
The head has the steam holes and the block doesn't..have been searching the web but nothing.
Would it be possible to drill the steam holes in the block using a head gasket as a template?
1939 Chevrolet Master Deluxe 85
1954 Chevrolet Bel Air Sport Coupe
1954 Chevrolet Bel Air Convertible |
Edited by chevyivar on 01-08-22 04:05 PM. Reason for edit: No reason given.
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GregH
Contributor
Posts: 193
Reg: 01-25-04
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01-09-22 02:03 PM - Post#2834229
In response to chevyivar
The 261 had siamesed cylinders that made the need for the steam holes. A 261 needs them and has to have them drilled if using a 235 head. A 235 block does not need them.
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chevyivar
Contributor
Posts: 163
Age: 41
Loc: Norway
Reg: 08-30-12
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01-09-22 04:08 PM - Post#2834246
In response to GregH
Thanks Greg, i Didn't know that. Guess ill go for a 235 head gasket.
1939 Chevrolet Master Deluxe 85
1954 Chevrolet Bel Air Sport Coupe
1954 Chevrolet Bel Air Convertible |
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haysd
Newbie
Posts: 4
Reg: 05-10-22
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05-10-22 02:19 PM - Post#2840982
In response to chevyivar
Have 1956 truck 261 and a 848 head off a 235 motor. I want to bore the openings in the head to match the in the middle between the arrangements of chambers on the 261. Is the piece involved a similar size as he openings in the square? I likewise recollect an inquiry being pose about "point", there and point is as well??
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 Airlifter
"7th Year" Gold Supporting Member
Posts: 860
Age: 76
Loc: Tazewell county, Virginia
Reg: 06-07-15
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05-10-22 05:24 PM - Post#2840998
In response to haysd
I installed an 848 head but I didn't drill the steam holes. I have read that it is not necessary and I wasn't near a machine shop near my location. Engine running fine.
| 1951 styline deluxe sport coupe w/'60 261 engine & 54 powerglide |
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 rrausch
"17th Year" Silver Supporting Member
Posts: 14810
Loc: L.A, Cal. & St. Louis...
Reg: 04-07-03
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05-11-22 05:53 AM - Post#2841017
In response to Airlifter
The 261 engines came in 2-ton trucks that were often worked hard. Hauling heavy loads up and down hills, especially in summertime, created a lot of heat in the engine. The steam holes and the full-pressure oil system both helped dissipate heat. But for our uses, I have read drilling the holes in an 848 head are not needed. Is that true? I have not heard of any overheating disasters from guys running 261/848 engines without drilling the steam holes.
1953 210 Convertible, 261 with dual Carter YF 966S carbs, P.S., Remote Bendix P.B. Booster... shade-tree restoration about done.
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haysd
Newbie
Posts: 4
Reg: 05-10-22
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05-11-22 08:35 AM - Post#2841028
In response to rrausch
Is the bit used the same size as he holes in the block? I also remember a question being ask about "angle", so is there and angle??
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rrausch
"17th Year" Silver Supporting Member
Posts: 14810
Loc: L.A, Cal. & St. Louis...
Reg: 04-07-03
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05-12-22 04:37 AM - Post#2841086
In response to haysd
I had mine drilled at the machine shop. If I can get to it, I've got a 261 head out in a barn shed. I'll try to take a look at it today, and maybe take some photos of the angle of the steam holes.
1953 210 Convertible, 261 with dual Carter YF 966S carbs, P.S., Remote Bendix P.B. Booster... shade-tree restoration about done.
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chevyivar
Contributor
Posts: 163
Age: 41
Loc: Norway
Reg: 08-30-12
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05-13-22 12:20 AM - Post#2841126
In response to chevyivar
FYI.
I ended up not drilling holes in my 235 block. I installed the 261 head together with the 261 gasket. working temperature is normal and no leaks, Still breaking in the rings, So far so good.
1939 Chevrolet Master Deluxe 85
1954 Chevrolet Bel Air Sport Coupe
1954 Chevrolet Bel Air Convertible |
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rrausch
"17th Year" Silver Supporting Member
Posts: 14810
Loc: L.A, Cal. & St. Louis...
Reg: 04-07-03
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05-13-22 10:28 AM - Post#2841146
In response to chevyivar
Glad you sorted it out.
Here is what I found:
This is a 1959, 261 head.
As can be seen, one steam hole is almost 90 degrees, while the other is slightly angled at 15-16 degrees from vertical.
Between cylinders 1&2
Between 3&4
Between 5&6
1953 210 Convertible, 261 with dual Carter YF 966S carbs, P.S., Remote Bendix P.B. Booster... shade-tree restoration about done.
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