Ai - stock-bottom into an 87 box - Chevy Impala SS Forum
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post #1 of 11 (permalink) Old 01-09-2017, 01:21 PM Thread Starter
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Ai - stock-bottom into an 87 box

I'm getting all the components together for this project. I'm tearing down a low-mile 96 Camaro motor with 643 castings on it. Heads are going to Ai for their 190cc magic.

The end goal is low-mid 12s in a 3900lb car with the supporting mods. Good driveability (like wife-driveable). Cam undecided, leaning towards AI's 220/226. Would prefer not to spin the factory long block over 6200.

Block looks pretty good, other than some minor etching on the rod bearings (no copper showing). Bores will need a hone, but not an overbore. Crank near perfect.

The plan is new rings, bearings, and seals. Clip the deck for quench around .035" with stock pistons. Align-hone the mains. Polish the crank. Resize the rods with ARP fasteners. New Melling SV oil pump. Am I missing anything?

The issue is getting exhaust out of it with these #### angle-plug heads! What kind of headers provide the best plug clearance? Afterburners? Tri-Y (gen 1 or 2)? Are they going to be a hindrance power-wise? I think the Quad-1s are probably overkill for a 350.

-95 RMS T-56, Commutes 130mi daily.
-96 RMS 39k mile creampuff!
-87 Caprice Brougham. LT1 swap in progress....
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post #2 of 11 (permalink) Old 01-09-2017, 02:05 PM
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I have gen 1 CIA Tri-y's. No problems.with plug access


1995 Caprice ERE 383, CIA long tubes, Dynomax VT's, RAISS, Kore3/Z06 brakes, 3.42 posi, Boss 338 20's, 12 way seats, Impala SS console, etc etc etc
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post #3 of 11 (permalink) Old 01-09-2017, 03:16 PM
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your motor build sounds good. AI or LE on the H/C combo. Not going to big on cam IMHO is good and I see if you are in the 218/224 or 220/226 range you should be good for a street car that you won't have to spin high to make its power

My 4200+ B-body runs high 12's with the 218/224 so your lighter box body should be a happy camper with a cam in that range

You running the donor LT1 with its 4L60E and PCM...or?

\'96 BBB 383/T-56
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post #4 of 11 (permalink) Old 01-09-2017, 07:01 PM Thread Starter
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That's good to hear on the GEN 1 Tri-Ys, Atlanta thanks. I take it you're running F-body heads?

Ballss, yeah I'm grabbing the rest of the running gear from my old 9C1 with a spun bearing. Harness, PCM, LTCC. 3.73 True-trac, 4L60e w/2800 stall. Also, the brake system and spindles so I can run 5X5 wheels all the way around.

I came very close to pulling the trigger on a 6.2 L92 motor to replace the knocking 305. But after many hours of research, it's a lot more money going that direction.

I figure an AI or LE LT1 will run with a cam-only LS and deliver about the same drive ability and mpg, while costing considerably less. No questions about driveshaft angles or engine placement. Plus LT1s are just cool motors to swap.

-95 RMS T-56, Commutes 130mi daily.
-96 RMS 39k mile creampuff!
-87 Caprice Brougham. LT1 swap in progress....
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post #5 of 11 (permalink) Old 01-09-2017, 10:37 PM
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Dans or Stans headers for the B-body are good

IDK if Camaro headers would work in the box body...but if so these would be a low cost option. Non Emission legal though.

https://www.summitracing.com/parts/psm-70-2239

\'96 BBB 383/T-56
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post #6 of 11 (permalink) Old 01-10-2017, 06:49 AM Thread Starter
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No emissions testing where I live fortunately.

I've been looking at the Afterburners, since those are known to flow well for the price, but I'm seeing mixed reviews on angle-plug access.

I think that overall the clearances should be very similar to our 94-96 models, with the exception that the crossmember is set up for a single exhaust. It's simple enough to modify, but if I can run a 3.5" single all the way back with a good flowing Y-pipe, I'd be fine with that. I'm trying to keep the external appearance grandpa anyways.

-95 RMS T-56, Commutes 130mi daily.
-96 RMS 39k mile creampuff!
-87 Caprice Brougham. LT1 swap in progress....
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post #7 of 11 (permalink) Old 01-10-2017, 10:04 AM
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Either of the Tri-Y's will more than support your power level.
I made 425 hp SAE to the wheels with Gen 1 Tri-Y's and angle plug heads. And went a second and a half quicker than your goal at 3800 lbs.

Stock bottom 350, Built by B-Body Performance
NA: 10.98 @ 122
100 shot: 10.35 @ 128
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post #8 of 11 (permalink) Old 01-10-2017, 10:22 AM
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There's No point in getting tri Ys or Quiad 1s unless you have low mount AC compressor like on an SS.
Save some coin and get the Summit 4 into 1 headers for full-size chevy cars.
They have plenty of clearance for angle plug heads and can change all plugs in 20 min.
https://www.summitracing.com/parts/s...01-9/overview/

Nab
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post #9 of 11 (permalink) Old 01-10-2017, 08:47 PM Thread Starter
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Yeah the intent is to have everything functional using my 9C1 accessories. Denting the crossmember for AC compressor clearance ala Hussker's "bigbird" thread.

OK so Tri-ys will easily support a mild AI topend. Nab, are you saying those summit headers have interference with the Impala accessory drive? The price looks good. Anything a mallet to the primaries can't fix?

Thanks for all the feedback here.

-95 RMS T-56, Commutes 130mi daily.
-96 RMS 39k mile creampuff!
-87 Caprice Brougham. LT1 swap in progress....
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post #10 of 11 (permalink) Old 01-11-2017, 06:28 AM
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Hi Jkilo,

The Summit longtubes interfere w/ the AC lines coming out of the 9C1/SS low mount AC compressor location.
If you are wanting to get the AC working in the old box then, you will need to switch the AC box inside the heater unit to one from the donor 9C1 b/c the fittings are not the same between the R12 (old) system) and the newer R134a system.
Its a lot more work for a car that isn't worth much more than $1k even when finished but I doubt thats why you are undertaking it.

Nab
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