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Performance, Brainstorming & Tuning Talk about modifications, or anything else associated with performance enhancements. Have a new idea for performance/reliability? Post it here. No idea is stupid! (please use Detailing and Appearance for cosmetic ideas)

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Old 03-21-2007, 12:56 AM   #111
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Quote:
Originally Posted by Regal_Kid_05
1. If you have an extra set of heads would it be worth it to port them while doing a LIM if you're NA? When I say port I don't mean take a bunch more material off than port matching but maybe from 1.9 X .9 to 2.0 X 1.0 or somthing like that. I assume this would be to large of an opening for a NA (L27 here) but I just wanted to check.
I wouldn't be thinking along those lines unless you had higher ratio rockers and/or a cam to be honest. Far too much work for very little gain.

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2. When you do your pems, did you remove any material from the exhaust side of the heads or just from the exhaust manifold itself?
Only from the manifolds. Clamp the manifold flange FIRMLY to a very flat surface that can help control the heat and draw it away from the flange quickly. Stitch-weld them in stages, one stitch, move to another runner, one stitch, move, one stitch move, then back to the first, repeat, repeat, repeat. This helps to prevent warping the flange. After they've been stitch-welded like this on the outsed of the runner to the flange, grind out at least 50% of the OEM weld on the inside of the exhaust manifold runners. Search for my topic titled "hole exhaust manifold cracks, batman". Fix the cracks while you're at it. You have them. Trust me.

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3. Is there a casting number list as to what numbers relate to what head (L27, L36, etc)?
To the best of my knowledge, all 92-94 L27 LIM'* are the same casting number and should be identical. Only the S1 L67 matters. There are two different castings for the L67. Non-walled runners are preferred. L36 LIM'* won't work on your L27. Not even close. Port spacing is totally different. As is the runner design.
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Old 03-21-2007, 01:18 AM   #112
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I already got a TB gasket, but it can be saved for an emergency too i guess...

Do you just want to PM me bill?
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Old 03-21-2007, 01:32 AM   #113
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Quote:
To the best of my knowledge, all 92-94 L27 LIM'* are the same casting number and should be identical. Only the S1 L67 matters. There are two different castings for the L67. Non-walled runners are preferred. L36 LIM'* won't work on your L27. Not even close. Port spacing is totally different. As is the runner design.
So lets say I know somebody that has some 3800 heads lying around and they think its from a series I motor...but not totally sure. If I posted some pictures could you tell me which heads they are and if they would work for my application?

I am considering them because if I remember right from what I've read, I most likely have 3/8" rocker bolts and some of the newer L27/S1 L67 heads fit my application and came with 5/16" ones which would be required if I wanted to run rockers without modifying the heads as the rockers only fit the 5/16" or something like that.

Thanks again for all your help, I really appreciate it.
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Old 03-21-2007, 01:35 AM   #114
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Do they have roller rockers?
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Old 03-21-2007, 01:39 AM   #115
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Well......to tell you the truth I don't remember from when I looked at them a while back. I'll porobably be able to get pictures up on friday, or at least sent to someone who knows how to post them
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Old 03-21-2007, 01:43 AM   #116
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if yo uhave the 3/8" rocker bolt then no you dont have rollers, 3/8" ended after '92 when it was changed to 5/16" and the roller rockers didnt come till '94.
however you can swap heads and get the 5/16" roller heads
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Old 03-21-2007, 01:56 AM   #117
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Don, that was AWESOME!! I love to see gains like that on NA. It'* just sweet!
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Old 03-21-2007, 07:37 AM   #118
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Let'* get some time in on this car before NEBF Don..... you need longer marks. Too much tread left on those tires.

Nice pic...
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Old 03-21-2007, 08:38 AM   #119
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Quote:
Originally Posted by BillBoost37
Let'* get some time in on this car before NEBF Don..... you need longer marks. Too much tread left on those tires.

Nice pic...
I might just loan him my Micky-T'* if he keeps the wheelspin going...burnout smoke is for show..timeslips determine who'* buying the beer.
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Old 03-21-2007, 09:11 AM   #120
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Quote:
Originally Posted by Peterg22000
if yo uhave the 3/8" rocker bolt then no you dont have rollers, 3/8" ended after '92 when it was changed to 5/16" and the roller rockers didnt come till '94.
however you can swap heads and get the 5/16" roller heads
This is incorrect. 93 L27'* had roller rockers. And the larger bolts. 94/95 L67'* got them one year later.

But this is straying off-topic.
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