'91 L98 Head Porting

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Nov 23, 2018 | 08:53 PM

#41

Chad Speier

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I'm certainly not looking for work! lol

I'm just an old school guy at heart and it would have been easy to throw a new set of heads on it.

Nov 23, 2018 | 09:16 PM

#42

confab

Melting Slicks

Joined: Nov 2013

Posts: 3,451

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From: Greater Cincinnati Area.

I think you did an excellent job. May make some people rethink their arbitrary decision making on components like this?

Good thread!!!

Nov 23, 2018 | 09:27 PM

#43

Chad Speier

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I have a chip and converter coming and then I will put it on a chassis dyno.

It will be interesting.

Last edited by Chad Speier; Nov 23, 2018 at 09:28 PM.

Nov 23, 2018 | 09:50 PM

#44

84 4+3

Le Mans Master

Joined: Aug 2017

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From: New Jersey

What are you thinking curve wise? I'd imagine even with the big tubes the shows going to be over around 4600 no? Just curious.

By the way, looks awesome... again.

Nov 23, 2018 | 10:34 PM

#45

Chad Speier

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Quote:

Originally Posted by 84 4+3

What are you thinking curve wise? I'd imagine even with the big tubes the shows going to be over around 4600 no? Just curious.

By the way, looks awesome... again.

With the mini ram I'm hoping 5600 or so.. I ditched the OEM set up.

Nov 23, 2018 | 10:41 PM

#46

84 4+3

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From: New Jersey

Quote:

Originally Posted by Chad Speier

With the mini ram I'm hoping 5600 or so.. I ditched the OEM set up.

Oh missed that. Thought you running the stock set up. My bad.

Nov 28, 2018 | 06:11 PM

#47

Chad Speier

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Dec 4, 2018 | 10:09 AM

#48

cv67

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From: altered state

St. Jude Donor '05

Looks good keep us posted
FWIW Chad doesnt need anyones $ here and most probably wouldnt want to pay what it costs..
Cardo google Chad before you make comments like that.

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Dec 4, 2018 | 10:37 AM

#49

Chad Speier

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I made a goof and got behind. I put a camshaft that was 108 LSA and when Scott got my chip he said he couldn't tune it. So I changed out the camshaft because I didn't want issues.

Live and learn!

Dec 4, 2018 | 10:39 AM

#50

Chad Speier

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Quote:

Originally Posted by cuisinartvette

Looks good keep us posted
FWIW Chad doesnt need anyones $ here and most probably wouldnt want to pay what it costs..
Cardo google Chad before you make comments like that.

I could never charge what I had in these 113's. Much better head out there.

Dec 4, 2018 | 01:37 PM

#51

MatthewMiller

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From: St. Charles MO

Quote:

Originally Posted by Chad Speier

I made a goof and got behind. I put a camshaft that was 108 LSA and when Scott got my chip he said he couldn't tune it. So I changed out the camshaft because I didn't want issues.

This is interesting to me. I have a 96 with seriously ported LT4 heads (Greg Good) and a cam with the same 108LSA. It has no problems at all with idle or even pulling 1500rpm on the freeway in 6th. The lobes are small with aggressive ramps, though, so maybe there's less actual overlap? Also, I run the 95 or 96 PCM, which may have more tuning parameters to work with.

Dec 4, 2018 | 02:18 PM

#52

Chad Speier

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Quote:

Originally Posted by MatthewMiller

We have done it here as well, but most were LS. I think the concern was the PCM. It's funny to me because I had a 226/234 108LSA 105ICL and .550 lift. I went to a 230/236 113LSA 109ICL and .570 lift.

Dec 5, 2018 | 01:10 AM

#53

Curveit

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From: San Antonio Texas

I was wondering how much material you was able to take out of the walls? I noted the heavy mods to the chamber too...what was the finished CC numbers? Good luck with the motor.

Dec 5, 2018 | 09:57 AM

#54

Chad Speier

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Quote:

Originally Posted by Curveit

I was wondering how much material you was able to take out of the walls? I noted the heavy mods to the chamber too...what was the finished CC numbers? Good luck with the motor.

I made the intake bigger for sure, I never cc'd them however. Remember as the flow goes up, you must increase CSA to keep the same velocity profile.

The chamber cc'd at 57 when I started and 68 when I was done. I cut the heads to 62 and used a .026 gasket instead of the .041 that was one it. I didn't think milling the heck out of the heads was the right thing to do.

Dec 5, 2018 | 11:12 AM

#55

DMITTZ

Melting Slicks

Joined: Mar 2016

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From: Langley BC

Thanks for sharing OP. I did a bunch of porting work on my 113 heads also. The castings are really rough from GM. Cleaning them up certainly looks like it would make a difference.