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Old 02-17-2013, 11:20 AM   #1
12 Gage Racing
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Default Switch from 23 deg to 15 deg

I got a very good deal on a set of -15 15 deg brodix heads, jesel shaft rockers (1.7 intake, 1.55 exh) and intake (brodix ported). They flowed 306ish with filled intake runners but have had lots of port work(circle track guy trying to slow down his car)

The engine I have has a set of 23 deg. track ones. I am wondering what I am looking at in the swap? The bottom end isn't ideal and I am not looking to spend a bunch right now.

Its a 350 sbc, 30 over, .621 lift cam if that makes a difference as well. If more info is needed I will do what I can to help. They are currently at anther shop so I don't have them sitting beside me now.









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Old 02-17-2013, 03:16 PM   #2
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Default Re: Switch from 23 deg to 15 deg

Those are -12 P heads I beleive. Im not sure they'll like the 4.030" bore. What size Intake valve is that?
-Pistons
-Headers
-Off-Set lifters(?)
But I would mock it all up and see what needs to be done first.
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Old 02-17-2013, 03:42 PM   #3
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Default Re: Switch from 23 deg to 15 deg

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Originally Posted by T-flow View Post
Those are -12 P heads I beleive. Im not sure they'll like the 4.030" bore. What size Intake valve is that?
-Pistons
-Headers
-Off-Set lifters(?)
But I would mock it all up and see what needs to be done first.
Looking again at the brodix website I think you may be right. The guy I bought them from was not 100% sure, and I am not sure what happened to the picture I took of the part number yesterday.

When you say they wont like that bore size, what do you mean?

valves are 2.125 int and 1.65 exh, I didn't measure those, thats from the guy I bought them from as well.

Pistons, I am not sure on the brand, but they are just generic flat top forged.

Headers, are hooker supercomps 1 7/8, but I was planning on picking up a new flange and make them work.

The lifers, I am guessing they are just standard, not offset.

I am going down to the shop next weekend to start to mock up and have a look and see, but I am interested in what all is needed for this to work. I have never done anything non-23 deg before so this is all new to me
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Old 02-17-2013, 04:44 PM   #4
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Default Re: Switch from 23 deg to 15 deg

Those things mentioned are thing's your going to have to check. The Exhaust on most are spread port style(different header flange). The chamber might be larger than your cylinder bore, thats all. You might have to use Off-Set lifters.
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Old 02-17-2013, 06:50 PM   #5
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Default Re: Switch from 23 deg to 15 deg

Alright, I will check on that when I test fit them next week

Thank you for the help!
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Old 02-17-2013, 07:02 PM   #6
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Default Re: Switch from 23 deg to 15 deg

I am going to guess this is a good deal that turns out to not be a deal in the long run. Having built my 18 degree motor from scratch and running and building several other 23 degree pieces, I will say there is ALOT more involved in this change then you would want to think about.
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Old 02-17-2013, 07:29 PM   #7
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Default Re: Switch from 23 deg to 15 deg

Usually you start with the pistons. Different angle on the valve relief and larger relief as well.
Probably cheaper to give me a deal on them, as I wouldn't mind switching everything next year. LOL.
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Old 02-17-2013, 10:37 PM   #8
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Default Re: Switch from 23 deg to 15 deg

I would be concerned about shouding the intake valve with the bore, I've run the 4.040 bore and with a 2.05 intake had to clearance the bore on the intake side. Unless these heads have moved the valve location around a 2.125 intake valve will be hanging over the deck.
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Old 02-17-2013, 11:49 PM   #9
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Default Re: Switch from 23 deg to 15 deg

Those heads need alot of love to make power. 306cfm is a joke for a 15* head.....Springs look rusty, stuff just looks old. I dont know...
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Old 02-18-2013, 01:06 AM   #10
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Default Re: Switch from 23 deg to 15 deg

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Those heads need alot of love to make power. 306cfm is a joke for a 15* head.....Springs look rusty, stuff just looks old. I dont know...
Short 100CFMs to make the Big Steam.Bill C.
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Old 02-18-2013, 01:59 AM   #11
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Default Re: Switch from 23 deg to 15 deg

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Originally Posted by SmallBlockNova View Post
Those heads need alot of love to make power. 306cfm is a joke for a 15* head.....Springs look rusty, stuff just looks old. I dont know...
I was kinda thinking the same!
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Old 02-18-2013, 08:25 AM   #12
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Default Re: Switch from 23 deg to 15 deg

There are plenty of newer 23* heads than that and are a better choice, if your going to make the switch do it right
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Old 02-22-2013, 09:00 PM   #13
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Default Re: Switch from 23 deg to 15 deg

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Originally Posted by SmallBlockNova View Post
Those heads need alot of love to make power. 306cfm is a joke for a 15* head.....Springs look rusty, stuff just looks old. I dont know...
Well, I talked to a buddy of mine that knows the guy that flowed them. Apparently his bench maxes at aprox. 300 (old bench) and also the heads have been filled as well. They flowed 306 at 0.700 lift as well.

Those pictures are misleading, looks much better in person. Heads have been rebuilt fairly recently as well
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Old 02-22-2013, 09:01 PM   #14
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Default Re: Switch from 23 deg to 15 deg

Quote:
Originally Posted by mcdonnough bros View Post
I would be concerned about shouding the intake valve with the bore, I've run the 4.040 bore and with a 2.05 intake had to clearance the bore on the intake side. Unless these heads have moved the valve location around a 2.125 intake valve will be hanging over the deck.
I am not 100% sure how its going to be until I pull the other ones and bolt these up.
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Old 02-22-2013, 09:14 PM   #15
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Default Re: Switch from 23 deg to 15 deg

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Originally Posted by JeffMcKC View Post
There are plenty of newer 23* heads than that and are a better choice, if your going to make the switch do it right
I still have my track ones, but it was a good deal so I figured I would pick them up and see what happens. I am sure lots of *23 stuff that makes lots of power, but is also lots of money and to use those heads as well it would take a different everything to get the best out of them as well.

I would like to build a new motor to use these heads but we will see when that is
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