L-29 heads - Page 2 - Chevelle Tech
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post #16 of 25 (permalink) Old Nov 1st, 19, 3:51 PM Thread Starter
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Re: L-29 heads

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Originally Posted by Rmchevelle View Post
Very interesting that the 215's didn't do any better for you than the peanut ports. I wonder if you've just stumbled upon a somewhat "just right" combination. Also, wondering what will take it to the next level. I'm anxious to see what the L29's do.
The PP heads were an experiment and they impressed me more than any closed chamber head I have ever used. I like the L-29 heads with the chamber and that alone will require less timing to make more power. The exhaust port on them are far superior to any other production BBC head GM ever used. All I need to better the PP 236 heads is 265 on the intake side and around 195 exhaust. I will take out the rocker stud hump in the ports and grind away on the swirl hump also as for racing it's not that important. Should have them done by Dec. I mat have this one head porter do a 5 angle job on the intake and a radius exhaust cut to help the air flow out. I do have a set of ported 360 PP heads ready to go if this does not work out.
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post #17 of 25 (permalink) Old Nov 1st, 19, 6:51 PM
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Re: L-29 heads

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Originally Posted by 68Chevele View Post
The PP heads were an experiment and they impressed me more than any closed chamber head I have ever used. I like the L-29 heads with the chamber and that alone will require less timing to make more power. The exhaust port on them are far superior to any other production BBC head GM ever used. All I need to better the PP 236 heads is 265 on the intake side and around 195 exhaust. I will take out the rocker stud hump in the ports and grind away on the swirl hump also as for racing it's not that important. Should have them done by Dec. I mat have this one head porter do a 5 angle job on the intake and a radius exhaust cut to help the air flow out. I do have a set of ported 360 PP heads ready to go if this does not work out.
The closed chambered heads have long been a favorite around here in part due to what Ed and others were able to show us was possible with them but this throws a bit of a monkey wrench into the works. A good monkey wrench, though. Who'd have thought mildly ported peanut port heads on a sub 8.0 compression shortblock and a relatively mild cam would go well in to the 11's in the 1/4? If possible, take some pics and or video to share on the progress with the L29's. I'd be interested in seeing it.
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post #18 of 25 (permalink) Old Nov 1st, 19, 10:14 PM Thread Starter
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Re: L-29 heads

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Originally Posted by Rmchevelle View Post
The closed chambered heads have long been a favorite around here in part due to what Ed and others were able to show us was possible with them but this throws a bit of a monkey wrench into the works. A good monkey wrench, though. Who'd have thought mildly ported peanut port heads on a sub 8.0 compression shortblock and a relatively mild cam would go well in to the 11's in the 1/4? If possible, take some pics and or video to share on the progress with the L29's. I'd be interested in seeing it.
I sure can take some pictures.
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post #19 of 25 (permalink) Old Nov 3rd, 19, 5:00 PM
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Re: L-29 heads

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Originally Posted by 68Chevele View Post
I sure can take some pictures.
I would be interested as well.

92Camaro
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post #20 of 25 (permalink) Old Nov 3rd, 19, 9:08 PM Thread Starter
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Re: L-29 heads

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Originally Posted by 92Camaro View Post
I would be interested as well.

92Camaro
I have a couple I can post this coming week. I will tell you guys one thing I did take out the swirl hump on the advice of my head machinist guy. I told him I thought you should just take part of it down as it would hurt the flow, he looked surprised by this and told me "are you going to race them or go for a Sunday cruise". He did show me a 6.0 LS head he did that he took out the hump and it peak flowed 340cfm and all the way up the numbers were good. He also stated that sure if it were a street application I might not take that out but when I build a NHRA super stock head we want it all. I also took out the rocker stud hump on the good port also. On the exhaust I did find some interesting stuff with the port. Seems it's the same as the Bow Tie heads except it's just smaller so I will open up the sides and get the same as the other heads that flow 240 on the exhaust side. May not quite get that with a 1.72 valve but it should be better than the dismal 150 something GM makes wit them. I will for sure flow these when I am done.
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post #21 of 25 (permalink) Old Nov 4th, 19, 5:03 PM
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Re: L-29 heads

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Originally Posted by 68Chevele View Post
I have a couple I can post this coming week. I will tell you guys one thing I did take out the swirl hump on the advice of my head machinist guy. I told him I thought you should just take part of it down as it would hurt the flow, he looked surprised by this and told me "are you going to race them or go for a Sunday cruise". He did show me a 6.0 LS head he did that he took out the hump and it peak flowed 340cfm and all the way up the numbers were good. He also stated that sure if it were a street application I might not take that out but when I build a NHRA super stock head we want it all. I also took out the rocker stud hump on the good port also. On the exhaust I did find some interesting stuff with the port. Seems it's the same as the Bow Tie heads except it's just smaller so I will open up the sides and get the same as the other heads that flow 240 on the exhaust side. May not quite get that with a 1.72 valve but it should be better than the dismal 150 something GM makes wit them. I will for sure flow these when I am done.
Thanks for the reply and your time. Just what I want to see and hear.

92Camaro
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post #22 of 25 (permalink) Old Nov 7th, 19, 11:59 AM Thread Starter
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Re: L-29 heads

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Originally Posted by Rmchevelle View Post
The closed chambered heads have long been a favorite around here in part due to what Ed and others were able to show us was possible with them but this throws a bit of a monkey wrench into the works. A good monkey wrench, though. Who'd have thought mildly ported peanut port heads on a sub 8.0 compression shortblock and a relatively mild cam would go well in to the 11's in the 1/4? If possible, take some pics and or video to share on the progress with the L29's. I'd be interested in seeing it.
Here are some L-29 head pictures,
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post #23 of 25 (permalink) Old Nov 7th, 19, 12:02 PM Thread Starter
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Re: L-29 heads

Here is a couple of pictures of the old 236 11 sec heads. Nothing fancy stock size valves. I have though about adding a ski jump to the top of the port thinking it might help with these. I got the idea from the SBC Vortec heads as it's there to help with velocity and your not supposed to cut it out, just wondering if the same would apply on a BBC PP head.
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post #24 of 25 (permalink) Old Nov 8th, 19, 10:59 AM
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Re: L-29 heads

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Originally Posted by 68Chevele View Post
Here are some L-29 head pictures,
Quote:
Originally Posted by 68Chevele View Post
Here is a couple of pictures of the old 236 11 sec heads. Nothing fancy stock size valves. I have though about adding a ski jump to the top of the port thinking it might help with these. I got the idea from the SBC Vortec heads as it's there to help with velocity and your not supposed to cut it out, just wondering if the same would apply on a BBC PP head.
Thanks for the pictures. Stock valve sizes with only mild porting is impressive.
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post #25 of 25 (permalink) Old Nov 8th, 19, 4:50 PM Thread Starter
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Re: L-29 heads

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Originally Posted by Rmchevelle View Post
Thanks for the pictures. Stock valve sizes with only mild porting is impressive.
I will see if I can find pictures of my 360 ported PP heads and post them up.
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