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#11 | |
![]() Join Date: Jan 2010
Location: Mystic CT
Posts: 2,627
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Rule #1:there's no replacement for displacement... 4 cams and displacement? LOOK OUT! In the case of your '38. 6 in a row makes ETs low... |
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#12 | |
![]() Join Date: Feb 2012
Location: Ledyard,CT
Posts: 8,312
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Cool, I have owned my GTX for over Forty years. I know it can't beat my ZR-1 or any of my other 500+ and 650+ hp cars. My little SSR will do 128 mph in the quart mile and it's weight is about 4800 lbs. ![]() |
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#13 |
Join Date: Aug 2005
Location: San Fernando Valley, CA.
Posts: 896
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3.08 gear with that motor is that possible?
seems mismatched to me. I love the old Gen 1 sbc with solid cams dont care what anyone says. Had a 70 Z/28 with a rowdier cam and headwork couldnt kill that thing used to beat it to death and was a daily driver to boot. impound yard finally destroyed it. Love the twin cam LT5 motor but my current Gen 1 motor would probably clean just about any new cars clock, they aint dead yet! |
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#14 |
![]() Join Date: Oct 2013
Location: Wichita Falls,Tx
Posts: 594
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#15 | |
![]() Join Date: Jul 2010
Location: Woodstock, Ontario, Canada
Posts: 1,271
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A L76/L84 longblock with dual 4 barrel carbs, with open headers in a 57 Chev Sports Sedam(2 door hardtop) with a 4 speed manual trans, and 5.13 gearing on 60's slick tire technology was good for 14 with second ET's. Then Sunday nights, the slicks and 5.13's came off, street tires, 3.55's went in and the mufflers got hooked back up for daily driving duties. Actual car ![]() Actual ad of car ![]() Same car in 1995 during a car show that Mom And Dad organized. I was on leave and made it back for the show. Car was trailered. ![]() Same car (on trailer) ![]() ![]() ![]() Factory Rating of GEN 1 SBC's L-76 327 V8 365 bhp @ 6200 rpm, 350 lb-ft @ 3400 rpm 4bbl carb L-84 327 V8 375 bhp @ 6200 rpm, 350 lb-ft @ 4600 rpm MFI (hiest stock gross hp rating of all GEN 1 SBC engines LT-1 350 V8 370hp @ 6000rpm, 380 lb/ft torque @ 4000rpm 4 bbl carb Modern dyno testing using the same longblocks carb and Ramjet injection were both fully tuned after installation: L-76 355 hp @ 5,700 rpm,366 lb-ft of torque at 4,100 rpm 4bbl carb A modern cam Comp Cams XS274S (0.501/0.510 lift/ 236°/242° duration @ 0.050" lift) tested and produced an extra 20hp/20 lb/ft torque over the original Duntov camshaft(0.484"/0.484" lift, 254°/254°duration@0.050" lift, 114°LSA L84 365hp @ 5600rpm/362lb/ft torque @ 4400rpm Ramjet Mechanical Fuel Injection The following engine dyno testing, not related to the above 1970 GEN 1 SBC-2nd highest gross power rating of all GEN 1 SBC's LT-1 353 hp @ 5,600 rpm, 392lb-ft at 4,100rpm 0.459"/0.485" 242°/254° Solid Flat Tappet Holley 3310 4V 780cfm 4 bbl carb 1996 GEN 2 SBC rated at 300 sae net hp @ 5000rpm/340lb/ft @ 4000rpm LT1 351 hp @ 5,700 rpm, 379lb-ft at 3,900rpm 0.450/0.460 202°/207° LSA 116° Hydraulic Roller Tappet Dual 48mm-630cfm There is of course no comparison of the solid tappet, lopey idle and throttle jazzing during clucth application to the smooth hydraulic roller cam idle and ability to apply the clutch from an idle. I know which one is more visceral, more mechanical and stimulates the senses the most. Each has it's place depending upon what one is trying to accompish. GEN 1 through GEN 5 now, with a Chev 4 cammer thrown in the mix. Such technology, such evolution while at the same time, in some respects, remaining the same. Nothing like these Chevrolet V8 engines. |
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#16 |
![]() Join Date: Feb 2012
Location: Ledyard,CT
Posts: 8,312
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Nice!!!!!
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#17 |
![]() Join Date: Jan 2004
Location: Murrieta, CA
Posts: 240
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[QUOTE=cuisinartvette;194397]3.08 gear with that motor is that possible?
seems mismatched to me.QUOTE] That gear does seem a bit tall... however, if low end torque is absent then the clutch will suffer over time. Keep in mind your only 1 to 1 in 4th gear and for those that have run 4.56s on the street with a 4 speed... well... you know its no fun driving a 100 miles to go some where as you cruise at 55 mph and 3 grand on the tach... or something like that. However, when the slicks are sticky and the clutch dumping traction factor is high... deep gears rule! ![]()
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91 ZR-1 #661 Watsons, 3" exhaust, Borlas... Hurst, 4.11s, Samco, RD radiator, gel coated motor... turquise / black |
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