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Calling everyone with 425+hp and stock internals Posted By: Archangel On: 01-14-2009 @ 12:50:17 Reply | Edit Hello everyone. I got some money for speed goodies but it isn't enough for building both a nice rotating assy and a heads/cam/headers combo(the heads alone are $1450) . Now, I thought about going for the power combo, which should generate somewhere between 425hp and 450hp imo. Will the stock LT1 internals hold? It has plasma moly piston rings and has been balanced. thanks  --  '91 GTA L98"What does matter is that the current GTA carries on the idea of the first Trans Am proudly and deservedly. It's still the most mature and sophisticated ponycar. It still has character.It still has muscle. And it's still worthy of the name." Car Craft, 1991 My GTA here: http://www.cardomain.com/id/erpichon [ Edited on 01/14/2009 @ 13:03:10 ] Posted By: Green97TAMachine On: 01-14-2009 @ 15:27:17 Reply | Top | Edit Stock LT1 bottom ends hold up fine to 400-450hp if they are N/A. When you go for the juice or boost, you will need to upgrade the rotating assembly. -- 
1997 Mystic Teal Trans Am Best Time: 13.984@102.99Mph  Posted By: Archangel On: 01-14-2009 @ 16:59:35 Reply | Top | Edit So it would be basically in the borderline, right? Would you do the same as I am going to do or would you have gone with the rotating assy? I am dying to get my hands on one of those AFR Street Eliminators and wouldn't want to miss the opportunity. -- '91 GTA L98
"What does matter is that the current GTA carries on the idea of the first Trans Am proudly and deservedly. It's still the most mature and sophisticated ponycar. It still has character.It still has muscle. And it's still worthy of the name." Car Craft, 1991 My GTA here: http://www.cardomain.com/id/erpichon Posted By: Green97TAMachine On: 01-14-2009 @ 19:55:13 Reply | Top | Edit I'd do the top end first, you can always upgrade the bottom end later. 400-450hp on a stock bottom end is a "safe zone". People have run 500+ on stock bottom ends with little to no trouble. It's your call though. --
1997 Mystic Teal Trans Am Best Time: 13.984@102.99Mph Posted By: 95ttoplt1 On: 01-14-2009 @ 22:31:53 Reply | Top | Edit 425 Flywheel HP won't be a problem. Bacically a stock LT1 on 150 shot. --  Posted By: RamAir95TA On: 01-14-2009 @ 23:08:17 Reply | Top | Edit Stock internals can take it, but if you have the $$$ to take care of the bottom end, I would definitely consider it. -- 95 T/A. Got some stuffs that go vroom vroom. Video Clip. Posted By: bad95ws On: 01-15-2009 @ 00:29:00 Reply | Top | Edit I'm in the 420hp range @ flywheel and had no trouble... I guess this post is good info for me, tho, because I've been considering nitrous for quite some time and wouldn't have thought the engine couldn't handle it. BTW, just get some DIY info on porting the heads and save yourself the $1450! I did the work on mine, paid VERY little for milling (i think it was less than $50), and am making PLENTY of LOW BUDGET hp. -- 95 TA M6: Predator hood, 2k Chrome Vette wheels, Red brake calipers, Hotchkis STB, pcmforless, LT4 knock module, msd and coil, ported MAF, ported and milled heads, ported TB, Hotcam kit, SPEC stg 3 clutch, SLP headers, orp, flowmaster, hurst shifter, eaton posi, strange 3.73 gear, moser axles http://www.myspace.com/steelstanding Posted By: Archangel On: 01-15-2009 @ 05:50:10 Reply | Top | Edit The thing is I have LT1 internals but my engine is a L98, so heads are the iron 083 units. I am thinking about getting some used Holley Systemax heads for $750 though. The difference is that the AFRs have the LS1 style lightweight valvetrain, have 65cc chambers vs 68cc for the Holley and their flow is about 30cfm more in both intake and exhaust; and of course, the extra $700. Any feedback on this? -- '91 GTA L98"What does matter is that the current GTA carries on the idea of the first Trans Am proudly and deservedly. It's still the most mature and sophisticated ponycar. It still has character.It still has muscle. And it's still worthy of the name." Car Craft, 1991 My GTA here: http://www.cardomain.com/id/erpichon [ Edited on 01/15/2009 @ 10:18:55 ] Posted By: Green97TAMachine On: 01-16-2009 @ 01:01:46 Reply | Top | Edit How does your L98 (TPI motor) have LT1 internals? Did you change them from the stock L98 internals to stock LT1 internals? If they haven't been changed, then you have L98 internals, not LT1 internals. --
1997 Mystic Teal Trans Am Best Time: 13.984@102.99Mph Posted By: Archangel On: 01-16-2009 @ 05:07:22 Reply | Top | Edit When I rebuilt the motor I was on a really tight budget and LT1 internals went in. I balanced the rotating assembly and got at least good bearings, rings, oil pump and doble roller chain. But it does have LT1 internals. Even an LT1 cam went into the motor, although I upgraded that later. I am planning on upgrading the rotating assembly but for now I think I'll do the top end. Which is AFR Street Eliminators 195cc, Comp Cams 280XFI, upgraded headers, pcmforless custom chip, 4.10 gears and and port the heck out of the SuperRam intake. As I said, I was considering the lesser used Holley Systemax heads for half the price but still undecided. -- '91 GTA L98"What does matter is that the current GTA carries on the idea of the first Trans Am proudly and deservedly. It's still the most mature and sophisticated ponycar. It still has character.It still has muscle. And it's still worthy of the name." Car Craft, 1991 My GTA here: http://www.cardomain.com/id/erpichon [ Edited on 01/16/2009 @ 08:41:49 ] Posted By: 87bandit On: 01-17-2009 @ 12:28:05 Reply | Top | Edit the main weak link in the stock bottom end is the pistons stock rods and crank should have zero problems with 425rwhp -- 
1994 Trans Am GT A4 - NOS Dry Kit, CC503, Comp 1.6 Magnum Rockers, K&N FIPK CAI, Trick Flow Elbow, 58mm TB, TP Built 4L60e, 3000 Stall, B&M Tranny Cooler, Pacesetter Midlength Headers, !EGR, !CAT, Cutout, Magnaflow Catback, M/T ET Streets, 30# SVO Injectors, Walbro 255lph, NGK TR6 Plugs, MSD 8.5mm Wires, Hypertech 160 Thermo, Manual Fan Switch, TB Bypass, LT4 KM, MAF Descreen, !Front Sway Bar, BMR Rear LCAs, MAC SFCs, Comp Engineering 3-way Adjustable Shocks, Energy Suspension Polyurethane Trans Mount, 3.73 gears Best Time: 7.56 @ 91.14mph (stock cam, stock tune, shitty tires) Posted By: dragonz28 On: 01-17-2009 @ 12:57:28 Reply | Top | Edit IMO the stock rod bolts start to stretch when spun over 6300rpms hence a lot of people with spun bearings. I'd put some ARP rod bolts in and let her fly. Stock pistons are fine for N/A applications. -- 94Z 12.993@102.11 1.72 60' Vig3200, 3.73s, PS Longtubes TDs, H-pipe, bullets dumped and a Madztune. 
Posted By: cheddar On: 01-17-2009 @ 17:06:27 Reply | Top | Edit Replacing the rod bolts = having to resize the rods. For that money and effort one would probably just upgrade the rods. The snowball effect then ensues with the project. My opinion is to just run it as-is. Makes for more excitement and tension when beating it hard knowing that you're living on the edge. -- 1981 Corvette, red on red, 4 speed, and rock stock........for now. Posted By: Green97TAMachine On: 01-18-2009 @ 03:49:13 Reply | Top | Edit   --
1997 Mystic Teal Trans Am Best Time: 13.984@102.99Mph Posted By: dragonz28 On: 01-18-2009 @ 12:21:18 Reply | Top | Edit I didn't think the rods would need to resized. I just figured you could tap out the old bolt then pull the new bolt in. I'm glad you said something Cheddar as I was getting ready to do new rods bolts on my spare block that's getting a H/C combo to keep costs down. Hmm, guess it's time to do some more research. -- 94Z 12.993@102.11 1.72 60' Vig3200, 3.73s, PS Longtubes TDs, H-pipe, bullets dumped and a Madztune.
Posted By: dragonz28 On: 01-18-2009 @ 13:40:56 Reply | Top | Edit Anyway here's a link to where I got my info from for what it's worth. http://www.ls1tech.com/forums/lt1-lt4-modifications/1031104-who-can-name-weakest-part.html -- 94Z 12.993@102.11 1.72 60' Vig3200, 3.73s, PS Longtubes TDs, H-pipe, bullets dumped and a Madztune.
Posted By: Archangel On: 01-18-2009 @ 14:22:28 Reply | Top | Edit Well, actually, the 425-450hp are at the flywheel. Second, I forgot to mention I have ARPs in the rods and mains. -- '91 GTA L98
"What does matter is that the current GTA carries on the idea of the first Trans Am proudly and deservedly. It's still the most mature and sophisticated ponycar. It still has character.It still has muscle. And it's still worthy of the name." Car Craft, 1991 My GTA here: http://www.cardomain.com/id/erpichon Posted By: dragonz28 On: 01-18-2009 @ 14:33:51 Reply | Top | Edit Don't mean to hi jack but I'd like to know why the rods would need resizing? Ya'll educate me on this. I've never done a complete rebuild just your basic refresh with bearings and rings. Thanks -- 94Z 12.993@102.11 1.72 60' Vig3200, 3.73s, PS Longtubes TDs, H-pipe, bullets dumped and a Madztune.
Posted By: cheddar On: 01-19-2009 @ 09:37:37 Reply | Top | Edit I swapped in ARP bolts in my first build. The process distorts or can distort the rod journal which leaves you with an ill fitting rod bearing and your bearing to crank clearance can be diminished.I had mine ground and for the cost and effort it seemed more logical to just go with an upgraded rod in my afterthoughts. -- 1981 Corvette, red on red, 4 speed, and rock stock........for now. Posted By: Archangel On: 01-19-2009 @ 13:11:56 Reply | Top | Edit Why would it distort the journal? -- '91 GTA L98
"What does matter is that the current GTA carries on the idea of the first Trans Am proudly and deservedly. It's still the most mature and sophisticated ponycar. It still has character.It still has muscle. And it's still worthy of the name." Car Craft, 1991 My GTA here: http://www.cardomain.com/id/erpichon Posted By: 87bandit On: 02-01-2009 @ 11:24:53 Reply | Top | Edit only problem with upgrading rods though is you have to rebalance. nice thing though is you can use pretty much any gen 1 stuff as long as the crank is 1 piece rear main seal this is the reason I went with a balanced kit, sometimes pieceing together your own isn't the most cost-effective. plus they kit will come with the correct bearings and rings you need to run --
1994 Trans Am GT A4 - NOS Dry Kit, CC503, Comp 1.6 Magnum Rockers, K&N FIPK CAI, Trick Flow Elbow, 58mm TB, TP Built 4L60e, 3000 Stall, B&M Tranny Cooler, Pacesetter Midlength Headers, !EGR, !CAT, Cutout, Magnaflow Catback, M/T ET Streets, 30# SVO Injectors, Walbro 255lph, NGK TR6 Plugs, MSD 8.5mm Wires, Hypertech 160 Thermo, Manual Fan Switch, TB Bypass, LT4 KM, MAF Descreen, !Front Sway Bar, BMR Rear LCAs, MAC SFCs, Comp Engineering 3-way Adjustable Shocks, Energy Suspension Polyurethane Trans Mount, 3.73 gears Best Time: 7.56 @ 91.14mph (stock cam, stock tune, shitty tires)
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