C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Brodix ik180 or afr180

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Old Oct 14, 2012 | 05:37 PM
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Default Brodix ik180 or afr180

So I now need to get my compression down... I can't even go wide open anymore and it pings under heavy load... My remedy? New heads! This thing is wild even not wide open so I want to see what she will do with heads here in 3-4 months

Looking at brodix or afr 180s this is a street car with majority daily driven miles. Track 1 time a year. Which head is better bang for the buck on durability, warranty, and all around street friendly?
I don't care if I make the most power. I want something that I can just use to play around with

This is a 383 and I'm scared 195 heads will create the need for a stall and gears
Thanks
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Old Oct 14, 2012 | 05:39 PM
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AFR 195s. They will do the 383 the most good and velocity will be great for the street. You may want to ask better minds than mine to inquire about thicker head gaskets to reduce compression also. If I remember correctly..10.5/10.75 comp. is about the max for street octane.

Last edited by ghoastrider1; Oct 14, 2012 at 08:03 PM.
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Old Oct 14, 2012 | 05:42 PM
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Originally Posted by ghoastrider1
AFR 195s. The will do the 383 the most good and volicity will be great for the street
I was really looking at those too

Do you think the raised exhaust port will affect my stock exhaust?
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Old Oct 14, 2012 | 05:57 PM
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Year model helps

Originally Posted by 76z28
So I now need to get my compression down...
My remedy? New heads!
New cam with more duration?
What heads / cam and what CR do you have now ?

Originally Posted by 76z28
I can't even go wide open anymore and it pings under heavy load.
Does it have a custom tune?
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Old Oct 14, 2012 | 06:02 PM
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stock heads
11.2:1 compression
edelbrock rolling thunder cam

tune from ed wright of fast chip
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Old Oct 14, 2012 | 07:08 PM
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Originally Posted by 76z28
stock heads
What year?

Originally Posted by 76z28
edelbrock rolling thunder cam
Which one ( part # )?

What octane , what diff gears?
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Old Oct 14, 2012 | 07:16 PM
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Originally Posted by rodj
What year?


Which one ( part # )?

What octane , what diff gears?

1990
#2209 very mild
91 california gas... and 3.07
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Old Oct 14, 2012 | 07:32 PM
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No question AFR 195s...
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Old Oct 14, 2012 | 08:30 PM
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Originally Posted by Mike 92LX
No question AFR 195s...
The catalog says the street head flow 280@.550. But most guys are seeing 286@.550. And the new comp port 195's flow almost 310cfm out of a little 195 head. Pretty remarkable. And there are some deals out there if you know where to look.
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Old Oct 14, 2012 | 09:31 PM
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Originally Posted by tpi 421 vette
The catalog says the street head flow 280@.550. But most guys are seeing 286@.550. And the new comp port 195's flow almost 310cfm out of a little 195 head. Pretty remarkable. And there are some deals out there if you know where to look.
well my problem is i only need to look at around .500 since i dont have a cam that large, i will look at the flow rates of both at .500 and come back
Thanks!
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Old Oct 14, 2012 | 11:13 PM
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dont worry about that peak lift # whats important are the lower#s

If you are stuck with stock exh manifolds Idont think they will cover the 195 port.
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Old Oct 14, 2012 | 11:20 PM
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If that cam is ground 4* advance try it straight up.
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Old Oct 14, 2012 | 11:28 PM
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Originally Posted by 76z28
i dont have a cam that large,
212° / 222° .462" / .479"

Time for a new cam better suited
Waste of time putting on new heads that flow past .550 with that cam
Even your stock '113 heads flow to .500 lift
http://temp.corvetteforum.net/c4/vader86/113heads.html
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Old Oct 15, 2012 | 08:48 PM
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First- You need to get an actual dyno tune

Second- The pinging may not be from high compression

Third- If you do want an durable, high quality head , go with the AFR.
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Old Oct 15, 2012 | 08:56 PM
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I think you may need to step back and get a good idea for where you want to end up, and what your budget will allow. I'm in the process of building a 383 for my 1990 Vett. I planned on saving some money, but to do it right it very hard to save anything.

IMO the stock exhaust will not breathe correctly, you need a cam with 112 degree lob separation so that you will have good vacuum on the street, and a cam with 226 straight across ZZ 409 will perform on the strip as well.

I have 200cc DART Pro 1 heads with a 64cc chamber, 2 relief flat top pistons which will put my CR at 11.04 / 1. I plan on machining the valve reliefs which should put the CR at 10.6 / 1. FYI the heads need to be aluminum as they will allow you to run a higher CR without detonation.

Long tube headers are a must to make it breath proper, and a reprogramed chip and.......... you really need to do it right so that you can enjoy the ride. Someone once told me "Don't save too much money, you can't take it with you.

Good Luck,
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Old Oct 15, 2012 | 09:40 PM
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Being as hes using a TPI he may be able to make the 180s work fine.
Remember the ol Lingenfelter 113s thatwere used for so long thats about the same size. Not sure about the Dart 200 compatibility with the manifolds never tried them.

Pretty sire the SHP heads are the old Iron Eagle stuff were you referring to the Platinum series pieces?

Even with a flat tappet cam you will gain power over the 113s. Those ported/stock #s are very lackluster.
The .100 or .200-.400 count a LOT on the street. Moreso imo than that peak # that sells heads.

Stock valved 113s are good for 22x/230ish int/20x exh if done right but still leave lots to be desired. If you can DIY or know someone doing you a favor....lots of way to skin a cat.

Last edited by cv67; Oct 15, 2012 at 09:46 PM.
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Old Oct 16, 2012 | 01:30 AM
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Originally Posted by Vett1990
my CR at 11.04 / 1. I plan on machining the valve reliefs which should put the CR at 10.6 /1.
May not have to , have you calculated your DCR?

http://members.uia.net/pkelley2/DynamicCR.html
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Old Oct 16, 2012 | 10:29 AM
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Originally Posted by 76z28
well my problem is i only need to look at around .500 since i dont have a cam that large, i will look at the flow rates of both at .500 and come back
Thanks!
Don't get hung up on flow numbers especially peak.

Originally Posted by cuisinartvette
dont worry about that peak lift # whats important are the lower#s

If you are stuck with stock exh manifolds Idont think they will cover the 195 port.
Bingo

Originally Posted by cuisinartvette
Being as hes using a TPI he may be able to make the 180s work fine.
Remember the ol Lingenfelter 113s thatwere used for so long thats about the same size. Not sure about the Dart 200 compatibility with the manifolds never tried them.

Pretty sire the SHP heads are the old Iron Eagle stuff were you referring to the Platinum series pieces?

Even with a flat tappet cam you will gain power over the 113s. Those ported/stock #s are very lackluster.
The .100 or .200-.400 count a LOT on the street. Moreso imo than that peak # that sells heads.

Stock valved 113s are good for 22x/230ish int/20x exh if done right but still leave lots to be desired. If you can DIY or know someone doing you a favor....lots of way to skin a cat.
Yes we know to know what intake OP is using on that L98 stroker as well....
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Old Nov 20, 2012 | 01:51 PM
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Originally Posted by l98tpi
First- You need to get an actual dyno tune

Second- The pinging may not be from high compression

Third- If you do want an durable, high quality head , go with the AFR.
I do not disagree that the AFR's are good heads but I'm sure all of you who are saying it is so cut and dry have never used the brodix heads. i promise you no one with the brodix heads would have anything bad to say about those either.
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Old Nov 20, 2012 | 04:57 PM
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Have brodix on my 427 sb,nothing to say but a great head.the camaro race car i just sold had afr BB heads on it,nothing but a great head.I would say you are looking at the two best, i did have one bad stud on the afr after 2 years with a .714 lift roller but great power making heads..good luck
.
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