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For a street car, 4.1 all the way. Better spool, more torque, and contrary to popular belief, they're not more expensive to build if you're planning on replacing the pistons anyway.
If you're looking for 9s, go with the 109.
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84 GN. 4.1L girdled with 8.5:1 JEs, 212-212 Comp Cam, GN1s, Ported stock intake, Ford FM IC, 6765DBB, KB headers, Cotton's 3" DP, Innovative Turbo Systems external gate, 60lb injectors, Turbo tweak chip, and a few misc things. No times with new combo yet. 06 Acura TL daily driver. |
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Same cost as an 3.8.
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Steve- 1987 GN, Astroroof, GNX dash, 109 3.8, .030 TRW forged, TE-62, CXR fmic, G Body DP, 212/212 cam, 60-65 Siemens inj, TT chip, LS1 MAF, port matched intake and heads, Razor's meth. inj. CK Trans, Pats Conv, Metco LCA's Monitored by:PLX WB, EGT, SM & DS 11.8 @ 117 w/ 4.1 -(R.I.P. 7/25/08) 1987 Gray Regal T-- Low Options: Bucket seats w/ console, G80, AM/FM, Pwr windows & Ant., thats it! LS1 MAF, 32lb inj, Chip, mostly stock and staying that way.... 2001 Jeep Cherokee 4.0 I6 4x4 K&N ![]() Daily Driver Out of F bodies..for good. |
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Im also doing a 4.1, so let me know how yours come out, and i will do the same. Im going to build it myself, just to see if i can. Im getting block done, and balance everything.
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87 GN, BB66,3000 westcoast stall,hotwire,walbro,DW,210/215 roller,4340 crank,65lb injt,homemade alky,Scan2.1. ect. |
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4.1 here's my pic, not the average 4.1 block i like many built her to run 9's safely. i only have one pic.
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87 gn 83lb inj-atr's twin-in-tank fuel pump eric's 83lb alcohol chip-k&n- tranny 10 vain pump, art carr shift kit, art carr 9inch non-lock-up converter, tranny cooler, billet servo, razor's awesome alcohol kit, a 3 inch exhaust kit with waker ultra-flows, RJC's Megacooler ( it is HUGH!!) 70MM throttle body, hydrulic roller cam 218-212, precision's AWESOME!! 70MM Duel BB turbo, ( worth every penny guys) engine block machine'd and blue-printed, TH 3.5 dp. etc,etc,etc. |
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No-Nos What casting # is that block?
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Steve- 1987 GN, Astroroof, GNX dash, 109 3.8, .030 TRW forged, TE-62, CXR fmic, G Body DP, 212/212 cam, 60-65 Siemens inj, TT chip, LS1 MAF, port matched intake and heads, Razor's meth. inj. CK Trans, Pats Conv, Metco LCA's Monitored by:PLX WB, EGT, SM & DS 11.8 @ 117 w/ 4.1 -(R.I.P. 7/25/08) 1987 Gray Regal T-- Low Options: Bucket seats w/ console, G80, AM/FM, Pwr windows & Ant., thats it! LS1 MAF, 32lb inj, Chip, mostly stock and staying that way.... 2001 Jeep Cherokee 4.0 I6 4x4 K&N ![]() Daily Driver Out of F bodies..for good. |
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Looks like someone added some extra bolt holes. Look at the far side, you will see the welded on tabs.
Usually one will add the RJC head clamps to the outer side. Billy T. gnxtc2@aol.com |
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That don't look like a 4.1 block. There's too much meat between the cylinder bores. It may be because it was decked. It sure has the coolant holes though.
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I don't think the production blocks (3.8 or 4.1) have bridged water passages on the end of the deck. Looks like a stage block to me.
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87' T-reX clone Runs like the loose bowels!!!12.37@111mph going easy on it TE44 hebrew_charger- Big Mouth Toothless Cold Air - Micheal Jackson stretch IC "heee heee" - James Bond 009 injunctions- xp fool pump- Raid Armstong 93chocolate chip - highwire and voltronbooster - Boost Commakazi- Alky anonomous kit- 2500stall cat converter& ship in the bottle kit - 3" DamnPipe - Free Flowing 2 1/2 double breathers- internally stock motion with Heavy Duty Valv-o-line - PolyU bushoggs - Goldburg shocks - Billet LowerControl elbows - Vari Rate Colons & a AssMaster 2.1. |
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Real curious what block that is exactly? Thinking of going 4.1 myself. Just sold my spare engine & need a project. Either that or an NA block. I have to see what one can take?
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87 LTD owned since May 88 No hood ornament from the factory! Old combo went 11.80 with 1.75 60 ft & broken crank gear teeth with 95* weather on a TA-49! New combo is roller & 6776 Turbo. Track times coming!
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Well my block checked out 0.30 over, and i ordered my pistons, rings, and HG. Anyone know the part number for the APR studs for the mains, and where to buy them?
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87 GN, BB66,3000 westcoast stall,hotwire,walbro,DW,210/215 roller,4340 crank,65lb injt,homemade alky,Scan2.1. ect. |
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I used a set I had for a 3.8 block.
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87' T-reX clone Runs like the loose bowels!!!12.37@111mph going easy on it TE44 hebrew_charger- Big Mouth Toothless Cold Air - Micheal Jackson stretch IC "heee heee" - James Bond 009 injunctions- xp fool pump- Raid Armstong 93chocolate chip - highwire and voltronbooster - Boost Commakazi- Alky anonomous kit- 2500stall cat converter& ship in the bottle kit - 3" DamnPipe - Free Flowing 2 1/2 double breathers- internally stock motion with Heavy Duty Valv-o-line - PolyU bushoggs - Goldburg shocks - Billet LowerControl elbows - Vari Rate Colons & a AssMaster 2.1. |
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Quote:
![]() Billy T. gnxtc2@aol.com |
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Whats the part# for the 3.8s, im sure there the same?
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87 GN, BB66,3000 westcoast stall,hotwire,walbro,DW,210/215 roller,4340 crank,65lb injt,homemade alky,Scan2.1. ect. |
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