236 vs 049 - Chevelle Tech
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post #1 of 11 (permalink) Old Mar 4th, 19, 12:41 PM Thread Starter
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Dan
 
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236 vs 049

With EVERYTHING being equal, how much HP would be gained switching from the PP 236 to the 049 or 781 heads ?
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post #2 of 11 (permalink) Old Mar 4th, 19, 2:06 PM
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jeff
 
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Re: 236 vs 049

Equal is the kicker here.
Does that mean both heads are bone stock?
I never liked stock heads.
But to be fair i will say the peanut ports will be almost as good as the larger oval head to 4500rpm and then the larger head will trump the 236.
here you go for some reading if you have not read it already.. yes the first head was Peanut port.
Oval Port Big-Block Chevy Cylinder Heads - The Big O - Super Chevy Magazine

But port them and you get much more from the 236 head
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post #3 of 11 (permalink) Old Mar 4th, 19, 3:58 PM
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Tom
 
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Re: 236 vs 049

HP is really a calculation based on Torque and RPM - the greater the RPM the greater the HP if all else is equal.

The 236 peanut port heads are considered the best of the peanut port heads and will actually make the same torque and HP through about 4,000 RPM. Because the 049 are large oval port heads, in stock condition (no port work and small valves) will give you about another 1,000 RPM of useful power so they will calculate a slightly higher HP figure. Most street vehicles will spend most of their time below that 4000 RPM mark so you would notice little difference.

The real difference comes when the small valves on the 049 heads are replaced with 2.19" intake valves and 1.88" exhaust, the throat is opened up for the larger valves and blending work is done along with mild porting - depending on the porting this can add 100 HP over stock 049's.
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post #4 of 11 (permalink) Old Mar 4th, 19, 7:20 PM Thread Starter
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Dan
 
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Re: 236 vs 049

Yes, both heads being bone stock ! Same cam, pistons , everything.
This question came to mind when I was thinking about when GM offered the Vortec head for the small block and many saw gains of 30 HP with just the heads.
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post #5 of 11 (permalink) Old Mar 4th, 19, 11:08 PM
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Jeremy
 
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Re: 236 vs 049

I don't know alot about the peanut port heads, but i built a .030" over 396 20 + years ago, when I just put a bunch of mish mash together that i bought from a guy. I had the small domed forged TRW pistons and the 781 heads, which are very similar to 049. It had to have very low compression. I added a 294s Comp solid lifter cam, lifter, springs kit and a Edelbrock Performer RPM intake with a 750 Edelbrock. I ended up replacing it with an 800 cfm Double Pumper Holley. I had a 4 spd and a 3.90 12 bolt posi in my 69 Camaro. Since it was my first big block i ever built, I goofed on the pistons as I didn't realize a big block engine with a open chamber head would be so low of compression. That is why i bought the 294 duration cam, as I figured it would be at least 10 to 1 compression. LOL. At any rate, the STOCK 781 heads 119cc, and small domed piston which probably gave me a 8.5 to 1 compression, didn't miss a beat. It ran really good. I was amazed. It would rev 6500 rpm all day long and obliterate the tires! So there are potential in just stock 049's. I had a pair of 049's and ran those last with 2.19/1.88 valves on a solid roller 468 and ran amazing. But if you could get the stock 049's for just a song, i would get them. run them for awhile, and then maybe later put some larger valves in them, as the flow potential in them are amazing for a GM casting. you will definitely pick up midrange and top end.
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post #6 of 11 (permalink) Old Mar 14th, 19, 10:14 PM
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Re: 236 vs 049

I have both the 781's and 236 PP heads. My 781's flowed 302cfm on the bad port and 321cfm on the good port with 211cfm on the exhaust @.600 lift with GM valves, 2.19 1.88. I currently run a 236 mild ported PP heads on a very low compression 461 just to play with. So far that 461 has surprised me with the best of a [email protected] at 6000 RPM. Never thought those peanut port heads were worth using. I have a set of 360 PP heads I will be getting flowed next week, I will let you guys know what they flow.
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post #7 of 11 (permalink) Old Mar 15th, 19, 12:22 AM
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Re: 236 vs 049

Mark Jones is pretty much an aficionado on those heads.
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post #8 of 11 (permalink) Old Mar 15th, 19, 10:47 AM
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Re: 236 vs 049

Quote:
Originally Posted by 68Chevele View Post
I have both the 781's and 236 PP heads. My 781's flowed 302cfm on the bad port and 321cfm on the good port with 211cfm on the exhaust @.600 lift with GM valves, 2.19 1.88. I currently run a 236 mild ported PP heads on a very low compression 461 just to play with. So far that 461 has surprised me with the best of a [email protected] at 6000 RPM. Never thought those peanut port heads were worth using. I have a set of 360 PP heads I will be getting flowed next week, I will let you guys know what they flow.
Thanks for the info on the 781's. What kind of work was done to the heads other than installing bigger valves?

92Camaro
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post #9 of 11 (permalink) Old Mar 15th, 19, 9:54 PM
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Re: 236 vs 049

Quote:
Originally Posted by 92Camaro View Post
Thanks for the info on the 781's. What kind of work was done to the heads other than installing bigger valves?

92Camaro
I opened up the intake ports, moved the wall on the one side .075 and raised the roof also spent some time on the short turn widening the outside area of the port. The exhaust was pretty straight forward mostly clean up and widening the seat then getting the short turn right. The guy who flowed them said it was hart to get 300 cfm on the bad port, did not seem like that much work. I may get them re-flowed with some Manley pro flow valves to see if the are any better than the GM valves.
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post #10 of 11 (permalink) Old Mar 16th, 19, 2:06 AM
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Quote:
Originally Posted by 68Chevele View Post
Quote:
Originally Posted by 92Camaro View Post
Thanks for the info on the 781's. What kind of work was done to the heads other than installing bigger valves?

92Camaro <img src="https://www.chevelles.com/forums/images/smilies/beers.gif" border="0" alt="" title="Beers" class="inlineimg" />
I opened up the intake ports, moved the wall on the one side .075 and raised the roof also spent some time on the short turn widening the outside area of the port. The exhaust was pretty straight forward mostly clean up and widening the seat then getting the short turn right. The guy who flowed them said it was hart to get 300 cfm on the bad port, did not seem like that much work. I may get them re-flowed with some Manley pro flow valves to see if the are any better than the GM valves.
Ferrea are nice valves as well.
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post #11 of 11 (permalink) Old Mar 16th, 19, 10:09 AM
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Re: 236 vs 049

Quote:
Originally Posted by 68Chevele View Post
I opened up the intake ports, moved the wall on the one side .075 and raised the roof also spent some time on the short turn widening the outside area of the port. The exhaust was pretty straight forward mostly clean up and widening the seat then getting the short turn right. The guy who flowed them said it was hart to get 300 cfm on the bad port, did not seem like that much work. I may get them re-flowed with some Manley pro flow valves to see if the are any better than the GM valves.
Thanks for the info

92Camaro
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