Your Induction system, heads, CIs, Cam, Compression, Trans, rear gear, exhaust- MPG.

1 piece rear 350, 60 over, 9.5:1 compression, LT4 roller cam, Vortec heads, Performer intake with AFB 4 barrel, long tube headers, 2 1/4 exhaust, 1992 Camaro T-5 with 3:08 rear, hardtop on. 21 mpg highway.

Speedometer and Odometer is not currently functional in the 1975 Corvette. To test the mpg I followed my girlfriend who was driving my 2006 Ford F150 from my parents house back home. We filled both cars and drove directly home. The drive was a little over 150 miles. She lead the way and set the cruise at 75 mph. It took right around 7 gallons. I have done the trip on other occasions and by the look on the gas gauge it appears that it can actually get more mpg if the gauge is accurate. City is much different. Also, there is no engine driven cooling fan. I have an electric fan with shround from a Mercury something, looked like a Taurus. Early 90's model.
 
Jupiter60 said:
1 piece rear 350, 60 over, 9.5:1 compression, LT4 roller cam, Vortec heads, Performer intake with AFB 4 barrel, long tube headers, 2 1/4 exhaust, 1992 Camaro T-5 with 3:08 rear, hardtop on. 21 mpg highway.

Speedometer and Odometer is not currently functional in the 1975 Corvette. To test the mpg I followed my girlfriend who was driving my 2006 Ford F150 from my parents house back home. We filled both cars and drove directly home. The drive was a little over 150 miles. She lead the way and set the cruise at 75 mph. It took right around 7 gallons. I have done the trip on other occasions and by the look on the gas gauge it appears that it can actually get more mpg if the gauge is accurate. City is much different. Also, there is no engine driven cooling fan. I have an electric fan with shround from a Mercury something, looked like a Taurus. Early 90's model.
Click to expand...

So, maybe 20-21 or more mpg. That's really good. :thumbs:
When you say AFB do you mean a real Carter or Edlebrock Performer?:bump:
 
350" SBC, Q-jet through Weiand 8000 manifold into AFR 180cc street heads w/72cc chambers, 9.75 static compression, CC XE262 (218*@.464" I & 224*@.472") w/114* LSA, 1 5/8" headers, 2 1/2" undercar exhaust w/X-pipe. Turbo 400 w/2000 stall, 3.36 rear gears.

85 octane, 5000+ feet elevation.

15+ MPG in combination driving, I'd say 60% city, 40% highway

Sure would like a .82 TKO 600.
 
JPhil said:
350" SBC, Q-jet through Weiand 8000 manifold into AFR 180cc street heads w/72cc chambers, 9.75 static compression, CC XE262 (218*@.464" I & 224*@.472") w/114* LSA, 1 5/8" headers, 2 1/2" undercar exhaust w/X-pipe. Turbo 400 w/2000 stall, 3.36 rear gears.

85 octane, 5000+ feet elevation.

15+ MPG in combination driving, I'd say 60% city, 40% highway

Sure would like a .82 TKO 600.
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The Road Race Tranny? My, thoughts also. Just not sold on it yet.:nuts:
 
I'm sold on it, just can't afford it. That's actually what I built the rest of the drive train around. I have a pretty wide, flat torque band (114* LSA is good for that) so I could run wider ratios, but I like the idea of a choice of gears at any speed. From canyon carving to flat out Wyoming running. If I remember right, with the 3.36 diff, I'd have a 9.84 first gear & 2.75 top gear. That works!
 
JPhil said:
I'm sold on it, just can't afford it. That's actually what I built the rest of the drive train around. I have a pretty wide, flat torque band (114* LSA is good for that) so I could run wider ratios, but I like the idea of a choice of gears at any speed. From canyon carving to flat out Wyoming running. If I remember right, with the 3.36 diff, I'd have a 9.84 first gear & 2.75 top gear. That works!
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I'm considering the RR tko600-mainly that I don't need a 200+mph top speed. I use all my RPM and the .87 fits my needs better. But, the price of install and the negative input I keep reading, makes me think there might be a "better" way to go.:drink:
 
383 stroker
hydraulic roller cam
edelbrock victor 215 runner heads
weiand polished blower
holley blower carb-D ,pumper 750 cfm
hooker super comp headers
aluminum flywheel and richmond t10 trans
3:55 rear
etc.
 
LT1 383- 4.030 bore x 3.75 stroke Eagle crank, Wiseco pistons, Scat rods
LT1 intake, ported by Lingenfelter
LT1 CNC ported stock aluminum heads, 2.0 and 1.60 valves, also by Lingenfleter
12.3:1 (gotta love reverse cooling!) :drink:
Gallant Technical Performance GTP6 .568/.592 236/242 112 lsa (with 1.6 rockers)
T56
4.11
undecided-car not finished yet...likely Hooker Supercomps LT headers, 3" duals w/x-corssover and Borla XR1s
got 25+ MPG HWY with same combo on stock bottom end 350 LT1
 
1981Z06Vette said:
LT1 383- 4.030 bore x 3.75 stroke Eagle crank, Wiseco pistons, Scat rods
LT1 intake, ported by Lingenfelter
LT1 CNC ported stock aluminum heads, 2.0 and 1.60 valves, also by Lingenfleter
12.3:1 (gotta love reverse cooling!) :drink:
Gallant Technical Performance GTP6 .568/.592 236/242 112 lsa (with 1.6 rockers)
T56
4.11
undecided-car not finished yet...likely Hooker Supercomps LT headers, 3" duals w/x-corssover and Borla XR1s
got 25+ MPG HWY with same combo on stock bottom end 350 LT1
Click to expand...

25+! Show off.:drink:
 
383 SBC
ProCharger centrifugal s/c model D1SC
Scat 4340 crank
Eagle h-beam rods with ARP L-19 rod bolts
Edelbrock Vic. Jr. heads and intake
Holley 750 d/p modded for blow-thru s/c
J-E forged dished pistons, approx 8.3:1 scr
Comp. Cams solid roller cam 242-248, 110 lsa
EndureX roller lifters (pressurized pin oiling)
Comp pro-magnum roller rockers
Centerforce 2 clutch, Lakewood blow-shield housing
with block plate
Richmond 5-speed trans., 3.08 rear end gear
3 in. exhaust w/Hooker MaxFlow mufflers
Aeromotive A1000 fuel system w/ cruise (reduced) voltage control
Only dyno #'s so far are 492 RWHP , 539 RWTQ @ 4,600 rpm. Big time blower belt slippage starting around 8 lbs. boost so I shut her down at 5,000 rpm's.
MPG's...single digits.
 
big_G said:
383 SBC
ProCharger centrifugal s/c model D1SC
Scat 4340 crank
Eagle h-beam rods with ARP L-19 rod bolts
Edelbrock Vic. Jr. heads and intake
Holley 750 d/p modded for blow-thru s/c
J-E forged dished pistons, approx 8.3:1 scr
Comp. Cams solid roller cam 242-248, 110 lsa
EndureX roller lifters (pressurized pin oiling)
Comp pro-magnum roller rockers
Centerforce 2 clutch, Lakewood blow-shield housing
with block plate
Richmond 5-speed trans., 3.08 rear end gear
3 in. exhaust w/Hooker MaxFlow mufflers
Aeromotive A1000 fuel system w/ cruise (reduced) voltage control
Only dyno #'s so far are 492 RWHP , 539 RWTQ @ 4,600 rpm. Big time blower belt slippage starting around 8 lbs. boost so I shut her down at 5,000 rpm's.
MPG's...single digits.
Click to expand...


Damn! I've always liked Forced Induction. I would think, with a little fine tuning-and keeping your foot out of it-you could get 12mpg.:suspicious:
 
I have stayed off this thread because I honestly didn't know what mileage I get.....but went on a trip to Gainsville and back, non car related, and so know I used about 7.2 gallons in 170 miles cruising at 60-80 all the way....some lights, some small town crap....

engine is a LT1 induction on L98 aluminum heads 10.5-1 comp, on a stockish '89 truck block 350 bored 30 over TRW flat top 4 brow pistons, tranny is a 200 4r with trans go kit, and a 336 rear, brakes are Oring so the car will coast outta my garage, it's just a drainage slab, nothing great....
rack steering and garage alignments by me.....275/50/17 in rear and 255/50/17 in front...anyone can see the pix, but most of you have, I suspect...nothing new...

the car got 24.6 mpg on the 170 mile trip above, and gets about 15-16 around town, IF I keep my toezzies out of the air valve....

:D:ghost:

Oh, i'ts a '72 vert weight 3300 lbs....

I drive top down, most ALL the time....I put on my funky sailing hat with chin strap, wife HATES it, cause it's not 'cool'.....at age 64 I"m entitled to look wacky....f'em all.....


:crutches::hi:
 
454 .030 over 532tqe/462hp at the crank
"Stock" 290 heads with mild porting
Manley Valves, Keepers, Retainers
Stock intake manifold
Stock Exhaust manifolds
Stock Qjet
Scat crank forged
Scat Rods forged
SRP Pistons forged
Speed Pro Rings
Coated ACL-H main and rod bearings
Coated Duro Bond Cam Bearings
Roller Cam .569/.569 280/292 224/[email protected] 111LSA
Morel Hyd Roller Lifters


MPG=0 Haven't driven it a mile yet:D


In pure stock form, it got between 13 and 15..depending on "driving habits"

edit: Getting 13-15 around town and 17 on the highway.
 
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SmokinBBC said:
454 .030 over 532tqe/462hp at the crank
"Stock" 290 heads with mild porting
Manley Valves, Keepers, Retainers
Stock intake manifold
Stock Exhaust manifolds
Stock Qjet
Scat crank forged
Scat Rods forged
SRP Pistons forged
Speed Pro Rings
Coated ACL-H main and rod bearings
Coated Duro Bond Cam Bearings
Roller Cam .569/.569 280/292 224/[email protected] 111LSA
Morel Hyd Roller Lifters


MPG=0 Haven't driven it a mile yet:D


In pure stock form, it got between 13 and 15..depending on "driving habits"
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Compression Ratio? Thanks.:bounce:
 
I am using a newer stye Edelbrock AFB style. I am sure I could get a littel bit more mpg. I haven't even gotten this thing aligned in the 3 years I have been driving it.

Gene
Do you have any inforation on your LT1 intake conversion?
 
Ol' Red

454 LS-7 block and guts.
4.25 bore x 4.00 stroke
GM "077" Aluminum heads 2.19 Intakes and 1.88 Exhaust 119cc Open Chambers rectangle ports
LS-7 Rods with ARP 7/16 bolts
Pistons GM 3976014 12.25:1 compression
Cam ZL-1 3959180 - .560I/.600E Lift .262I/.273E Duration @ .50 lift
7/16 pushrods and guideplates.
GM 3933163 Intake
750 Holley DP
GM TI Distributor with Summit (Mallory) CD box w/ rev limiter
Hooker 2-1/8 primary sidemount headers with STS Baffles
M-21 Close Ratio 4 speed
4.11 rear gears with 25" tall tires

gas mileage = not much (I never figured it) (my bad)
 
Jupiter60 said:
I am using a newer stye Edelbrock AFB style. I am sure I could get a littel bit more mpg. I haven't even gotten this thing aligned in the 3 years I have been driving it.

Gene
Do you have any inforation on your LT1 intake conversion?
Click to expand...

Well, I dunno if I typed that correct or not....LT1 to ME is the later DPFI engine/induction not the early 70's carb thing....

I have had DPFI on there for some 13 years now, one of the first things done well before the overdrive, as I was up north then in the Wash DC region....

the only bolt on to the original L48, was the L98 setup, and so it got 24 mpg with the muncie...336 rear same in there now....

after having a hotrod 355 roller engine built, I swapped it out some 11 years ago down here, with a o/drive automatic 700 and later swapped tranny to a 200 4r which is much more suited to the car....

I currently have later aluminum L98 heads on it, and so when ditching the L98 setup I put on a highly modded LT1 intake, last winter's project....

the intake takes a LOT of modifying to get it to fit....need a lot of TIG welding, and machine work...but when done, it's SO much simpler to work with

:bounce:
 
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