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Old 04-23-2011, 11:03 PM
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big block chevy casting 236

i have found some heads with 236 castings are tjese good heads for a street head or should i stick with some 781 the 236 heads are 100 bucks

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Old 04-23-2011, 11:13 PM
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Quote:
Originally Posted by kennyhammond
i have found some heads with 236 castings are tjese good heads for a street head or should i stick with some 781 the 236 heads are 100 bucks
236 heads are peanut port truck heads. Max out around 450 HP w/stock ports and valve size. 781 or 049 oval port heads have a lot more potential.
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Old 04-24-2011, 05:59 AM
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X2.
i run a set of 049's and they work awesome for my mild built 454. would like some bigger valves, but in time i will get the work done.
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Old 04-24-2011, 07:32 AM
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Quote:
Originally Posted by kennyhammond
i have found some heads with 236 castings are tjese good heads for a street head or should i stick with some 781 the 236 heads are 100 bucks
you cant beat those 781's (or 049's also)
from what i've learned, if you put big valves in them and dress up the porting, they are just about the perfect hot street bbc head.
236's would only be good on lower rpm motors without a ton of work.
i have a set of 236's that have low miles on a rebuild, i would just about give away.
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Old 04-24-2011, 07:42 AM
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Quote:
Originally Posted by chevykid90
X2.
i run a set of 049's and they work awesome for my mild built 454. would like some bigger valves, but in time i will get the work done.
What size of valves do you have in them, chevykid90?




The 236 are good for low end grunt. But, upper end looses out.
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Old 04-24-2011, 08:31 AM
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well i am wanting somethen that sill get down and suck you na k in the seat the truck will never hit the track it is just a fun truck for around town.... the 781 heads came off a mud raceing truck so i think they have had a valve job and all
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Old 04-24-2011, 10:18 AM
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Quote:
Originally Posted by kennyhammond
well i am wanting somethen that sill get down and suck you na k in the seat the truck will never hit the track it is just a fun truck for around town.... the 781 heads came off a mud raceing truck so i think they have had a valve job and all
bolt them on
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Old 04-24-2011, 12:16 PM
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454, what turns your crank?
 

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Quote:
Originally Posted by Bowtie man
What size of valves do you have in them, chevykid90?

the stock valve size, 2.08 In 1.76? or is 1.77? Ex

i would really like to get them worked on and have the 2.19 In and 1.88 Ex. i shouldn't need valves bigger than that for what i do. i think any bigger and it would be a waste. and a better intake, mine chokes out after 5,500 RPM
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Old 04-24-2011, 01:53 PM
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Quote:
Originally Posted by kennyhammond
well i am wanting somethen that sill get down and suck you na k in the seat the truck will never hit the track it is just a fun truck for around town.... the 781 heads came off a mud raceing truck so i think they have had a valve job and all
I would check the 781's an make sure they are in good shape an ready to work with your cam. I think you will like them. I have a set of 049's with 2.19 an 1.88's in them. Will be bolting them on a block before long.
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