multi-carb big block corvette intakes + related info

[grumpyvette]

some of the most sought after corvettes are the 1967-1968 big block triple carb 3x2 corvettes
they came on both the oval port and rectangular port head engines, the rectangular port intakes are far rarer, than the oval port intakes,the oval port intake cars were much toned down at 400hp but actually they were a better choice for strictly street transportation because they had a torque curve that came in at a noticeably lower rpm range, and had hydraulic lifter cams
but any tri-power in excellent condition with matching parts can easily cost $4-$6k now (almost as much as the whole car did originally)you could get a whole big block corvette in 1967-1968 for UNDER $8K

now its true the L88 BIG BLOCK WAS THE TRUE PEAK HP WINNER, that had more horsepower and It had a single carb intake ,
but the tri-power cars were rated higher at 400hp and 435HP because at least rumors at the time said, the factory wanted only the true racers in the know about the true power potential buying the 430hp rated L88
The L88 Corvette.... is among the rarest of the rare of all Corvettes with production quantities of: 20 in 1967, 80 in 1968, and 116 in 1969... A total three year L88 production of only 216 units.
http://carcraft.automotive.com/115830/c ... index.html

notice the true L88 intake has a plenum divider milled out

while the more common 375hp 396 intake looks similar its not identical and has a plenum divider intact
http://www.cranescorvette.com/tri_powers.htm
http://www.corvettefever.com/howto/74718/index.html

but the listed hp at the time showed the tri-power corvettes were the most powerful available at 425hp(1967) and 435 hp(1968)
and theres no doubt that the performance and sound of the 3x2 corvettes was impressive
theres many guys who took those intakes off and replaced them once they found that the better 4 barrel intakes and a single 780cfm-950cfm Holley could produce a bit more hp, in many cases

larger intake manifold plenum volume TENDS to allow higher rpms
throttle body efi acts like a carb, as the injectors dump fuel/air in the plenum

\

direct port fuel injection has a separate, individual fuel injector feeding each cylinder, the plenum essentially runs mostly dry air free of fuel

 

[grumpyvette]

Re: multi-carb big block corvette intakes (related info)

Cast #: CID/HP: Year: Type:
336789 454 / 235 74 Pass, Chevelle, Monte Carlo Cast Iron, Oval Port, Lo-Rise, Q-jet carb
336789 454 / 270 74 Vette Cast Iron, Oval Port, Lo-Rise, Q-jet carb
340261 350 74-76 160, 185, 195, 245 & 250 HP, 400/100 Corvette and more
340281 305, 350 82-85 Cast Iron, Spreadbore 4-bbl
346242 454 / 215 75 Pass, Chevelle, Monte Carlo Cast Iron, Oval Port, Lo-Rise, Q-jet carb
346249 350, 400 75 Corvette, Nova, Chevelle and more
346250 305, 350 Cast lron, Spreadbore 4-bbl
353015 454 / 245 73 Vette Cast Iron, Oval Port, Lo-Rise, Q-jet carb
353015 454 / 215 73 Pass, Chevelle, Monte Carlo Cast Iron, Oval Port, Lo-Rise, Q-jet carb
364740 454 / 230 76 Lt. Truck Cast Iron, Small Oval Tr Port, Lo-Rise, Q-jet carb
393841 454 / 270 72-75 Lt. Truck Cast Iron, Oval Port, Lo-Rise, Q-jet carb
393841 402 / 210 72 Chevelle Cast Iron, Oval Port, Lo-Rise, Q-jet carb
393841 454 / 230 72-75 Lt. Truck Cast Iron, Oval Port, Lo-Rise, Q-jet carb
393841 402 / 240 Lt. Truck Cast Iron, Oval Port, Lo-Rise, Q-jet carb
458520 305, 350 Aluminum, Spreadbore 4-bbl
1403372 350 80-82 Corvette, Camaro Cross Fire injection
3711348 265 55 Corvette, Cast Iron, Spreadbore 4-bbl
3728725 265 56 225HP, Corvette, Aluminum, 2x4, 4-bbl
3731394 265 56 225HP, Corvette, Aluminum, 2x4, 4-bbl, 2nd design
3731398 283 57 220HP, Corvette, Cast Iron, 4-bbl
3735448 265 56 210HP, Corvette, Cast Iron, 4-bbl
3737109 265 56 Cast Iron, 4-bbl
3739653 283 57-61 Corvette, Aluminum, 2x4, 4-bbl
3739653 283 57 245, 270HP, Aluminum, 2x4, 4-bbl
3741193 283 57 Aluminum
3746829 283 57-61 Cast Iron, 4-bbl
3746829 283 58-61 230HP, Corvette, Cast Iron
3783244 283, 327 62-63 Cast Iron, Chevy II, 4-bbl
3783244 327 62-63 250HP, Corvette, Cast iron
3794129 327 63 340HP, Corvette, Aluminum
3795397 327 62 340HP, Corvette, Aluminum
3799349 327 62-64 300HP, Corvette, Cast Iron, Carter AFB
3826810 327 63-65 Corvette, Aluminum
3837109 265, 283 56-57 Cast Iron
3837109 265 56 210HP, Corvette, Cast iron, 4-bbl
3844457 283, 327 64-65 Corvette, Chevelle, Chevy II, Cast Iron
3844459 327 63-65 300HP, Corvette, Chevelle, Chevy II, Cast Iron
3844461 327 64-65 350/365HP, Corvette, Chevelle, Aluminum, Hirise Holley
3856289 396 / 325 66 Chevelle Cast Iron, Oval Port, Hi-Rise, Q-jet carb
3856289 396 / 325 65-66 Pass Cast Iron, Oval Port, Hi-Rise, Q-jet carb
3856289 427 / 390 65-66 Pass Cast Iron, Oval Port, Hi-Rise, Q-jet carb
3866922 283, 327 62-65 Corvette, Chevelle, Chevy II, Cast Iron
3866948 396 / 350 66-67 Chevelle w/o AIR Cast Iron, Oval Port, Hi-Rise, Holley carb
3866948 396 / 325 66-67 Chevelle w/o AIR Cast Iron, Oval Port, Hi-Rise, Holley carb
3866948 427 / 390 66 Pass Cast Iron, Oval Port, Hi-Rise, Holley carb
3866948 427 / 390 66-67 Vette Cast Iron, Oval Port, Hi-Rise, Holley carb
3866948 396 / 350 67-68 Camaro Cast Iron, Oval Port, Hi-Rise, Holley carb
3866963 396 / 425 65 Vette, Pass Aluminum, Square Port, Hi-Rise, Holley carb
3866963 396 / 375 65 Chevelle Aluminum, Square Port, Hi-Rise, Holley carb
3872783 327 66-68 Truck, Cast Iron, Holley
3872783 327 66-67 300HP, Corvette, Cast Iron, Holley
3872783 327 66 275HP w/o A.I.R, Chevelle, Chevy II, Cast Iron, Holley
3875954 327 66 275HP with A.I.R, Cast Iron, Chevelle, Chevy II
3877656 327 66-67 350HP, Aluminum, Hirise, Holley
3882858 283 66 220HP, Chevelle, Chevy II, Cast Iron
3883948 396 / 325 67-68 Camaro Cast Iron, Oval Port, Hi-Rise, Q-jet carb
3883948 427 / 390 67 Vette Cast Iron, Oval Port, Hi-Rise, Q-jet carb
3883948 396 / 350 66-68 Pass, Chevelle Cast Iron, Oval Port, Hi-Rise, Q-jet carb
3883948 396 / 325 66-68 Pass, Chevelle Cast Iron, Oval Port, Hi-Rise, Q-jet carb
3883948 427 / 390 66-68 Pass Cast Iron, Oval Port, Hi-Rise, Q-jet carb
3883948 427 / 385 66-68 Pass Cast Iron, Oval Port, Hi-Rise, Q-jet carb
3883948 396 / 350 67-68 Camaro Cast Iron, Oval Port, Hi-Rise, Q-jet carb
3885069 396 / 375 66-68 Chevelle Aluminum, Square Port, Hi-Rise, Holley carb
3885069 396 / 375 68 Chevy II Aluminum, Square Port, Hi-Rise, Holley carb
3885069 427 / 430 67-68 Vette, L-88, Open plenum Aluminum, Square Port, Hi-Rise, Holley carb
3885069 427 / 425 66-68 Pass Aluminum, Square Port, Hi-Rise, Holley carb
3885069 427 / 425 66 Vette Aluminum, Square Port, Hi-Rise, Holley carb
3885069 396 / 375 67-68 Camaro Aluminum, Square Port, Hi-Rise, Holley carb
3886093 427 / 430 67 Vette, L-88, Open plenum Aluminum, Square Port, Hi-Rise, Holley carb
3890490 327 66-67 350HP, Corvette, Chevelle, Chevy II, Aluminum, Hirise, Holley
3894374 427 / 435 67 Vette Aluminum, Square Port, Hi-Rise, 3x2 carb
3894382 427 / 400 67 Vette Aluminum, Square Port, Hi-Rise, 3x2 carb
3904574 427 / 430 67 Vette Aluminum, Square Port, Hi-Rise, Holley carb
3905393 350 67 295H, Camaro, Cast Iron
3905393 327 67 275HP, Chevelle, Chevy II, Camaro, Cast Iron
3917610 302 67-68 Z28 Camaro, Aluminum, Hirise, Holley
3919803 327 68 250/275/325/350HP, Corvette, Chevy II, Chevelle, Cast Iron
3919803 350 68 295HP, Camaro, Cast Iron
3919849 427 / 390 68 Vette Aluminum, Square Port, Lo-Rise, Q-jet carb
3919850 427 / 400 68 Vette Aluminum, Oval Port, Lo-Rise, 3x2 carb
3919852 427 / 435 38 Vette Aluminum, Square Port, Lo-Rise, 3x2 carb
3919878 396 / 375 68 Nova, lowered plenum divider Aluminum, Square Port, Hi-Rise, Holley carb
3919878 396 / 375 67-68 Camaro, Chevelle Aluminum, Square Port, Hi-Rise, Holley carb
3919878 427 / 425 68 Pass Aluminum, Square Port, Hi-Rise, Holley carb
3927184 350 69 255/300/350HP, Corvette, Camaro, Chevy II, Chevelle, Cast Iron
3931067 396 / 350 69 Nova, Chevelle, Camaro Cast Iron, Oval Port, Hi-Rise, Q-jet carb
3931067 396 / 325 69 Nova, Chevelle, Camaro Cast Iron, Oval Port, Hi-Rise, Q-jet carb
3931067 427 / 390 69 Pass Cast Iron, Oval Port, Hi-Rise, Q-jet carb
3931067 427 / 335 69 Pass Cast Iron, Oval Port, Hi-Rise, Q-jet carb
3932472 302 69 Z-28 Camaro, Aluminum, Hirise, Holley
3933163 427 / 425 69 Camaro, Chevelle Aluminum, Square Port, Hi-Rise, Holley carb
3933163 427 / 425 68-69 Pass Aluminum, Square Port, Hi-Rise, Holley carb
3933163 396 / 375 68-69 Nova, Chevelle, Camaro Aluminum, Square Port, Hi-Rise, Holley carb
3933198 427 / 430 68-69 Vette, L-88, open plenum Aluminum, Square Port, Hi-Rise, Holley carb
3933198 427 / 430 69 Camaro, Vette ZL-1, Open plenum Aluminum, Square Port, Hi-Rise, Holley carb
3933198 427 / 430 69 Camaro, Vette ZL-1, Open plenum Aluminum, Square Port, Hi-Rise, Holley carb
3937793 427 / 390 68 Vette Aluminum, Oval Port, Lo-Rise, Q-jet carb
3937795 427 / 400 68-69 Vette Aluminum, Oval Port, Hi-Rise, 3x2 carb
3937797 427 / 435 68-69 Vette Aluminum, Square Port, Hi-Rise, 3x2 carb
3941126 302 68-69 Z-28 Camaro, 2x4 Holley, Aluminum
3941130 302 68-69 Z-28 Camaro, 2x4 Holley, Aluminum
3947801 427 / 390 69 Vette Aluminum, Oval Port, Lo-Rise, Q-jet carb
3952900 396 / 265 69 Pass Cast Iron, Oval Port, Hi-Rise, 2-barrel
3955287 454 / 390 70-71 Vette, LS-5 Cast Iron, Oval Port, Lo-Rise, Q-jet carb
3955287 402 / 350 70-71 Nova, Chevelle, Camaro Cast Iron, Oval Port, Lo-Rise, Q-jet carb
3955287 402 / 300 70-71 Nova, Chevelle, Camaro Cast Iron, Oval Port, Lo-Rise, Q-jet carb
3955287 402 / 330 70-71 Nova, Chevelle, Camaro Cast Iron, Oval Port, Lo-Rise, Q-jet carb
3955287 454 / 365 70-71 Vette, LS-5 Cast Iron, Oval Port, Lo-Rise, Q-jet carb
3959594 350 72 255HP LT-1 Corvette, Z-28, Aluminum, Hirise, Holley
3959594 350 71 330HP LT-1 Corvette, Z-28, Aluminum, Hirise, Holley
3963569 454 / 425 71 Vette LS-6, Chevelle, Monte Carlo SS Aluminum, Square Port, Lo-Rise, Holley carb
3963569 402 / 375 70 Camaro, Nova, Chevelle, L-78 Aluminum, Square Port, Lo-Rise, Holley carb
3963569 454 / 450 70 Chevelle, LS-6 Aluminum, Square Port, Lo-Rise, Holley carb
3965577 350 70 300/350HP, Corvette, Camaro, Nova, Chevelle, Cast Iron
3966948 396 / 360 66-67 Chevelle w/o AIR Cast Iron, Oval Port, Hi-Rise, Holley carb
3967474 454 / 425 71 Vette, Open plenum Aluminum, Square Port, Hi-Rise, Holley carb
3969802 454 / 390 70 Vette Cast Iron, Oval Port, Lo-Rise, Q-jet carb
3972110 350 70 350/360/370HP, LT1 Corvette, Camaro, Aluminum, Hirise, Holley
3972114 350 72 Z-28 Camaro, Aluminum, Hirise, Holley
3972116 350 72 Service replacement for 1970 LT1
3972361 350 70-71 Z-28 Camaro, Aluminum, Holley
3973469 350 71 270HP, Corvette, Camaro, Nova & more, Cast Iron
3997771 350 73 175/190/245/250HP, Corvette, Camaro & more, Cast iron
6263751 350 72 175/200HP, Corvette, Camaro, Nova & more, Cast iron
6263753 402 / 240 72 Pass Cast Iron, Oval Port, Lo-Rise, Q-jet carb
6263753 402 / 240 72 Chevelle, Camaro, Monte Carlo Cast Iron, Oval Port, Lo-Rise, Q-jet carb
6263753 454 / 240 72 Pass Cast Iron, Oval Port, Lo-Rise, Q-jet carb
6263753 454 / 270 72 Pass Cast Iron, Oval Port, Lo-Rise, Q-jet carb
6263753 454 / 270 72 Chevelle, Monte Carlo Cast Iron, Oval Port, Lo-Rise, Q-jet carb
6263753 454 / 270 72 Vette Cast Iron, Oval Port, Lo-Rise, Q-jet carb
6269318 396 & 427 68-69 service replacement Aluminum, Square Port, Hi-Rise, Holley carb
10051103 Bowtie, Aluminum, 23deg heads, Raised Runner, Holley
10052952 454 88 Truck Cast Iron, Oval Port, Lo-Rise, TBI or Q-jet carb
10068015 305 - 350 Aluminum, TPI, EGR
10185063 350 ZZ3 & ZZ4 HO Crate motor. Aluminum, dual carb pattern, EGR
12363420 97 Bowtie Oval Port Aluminum, Hi-Rise, Split plenum, Dual carb
14057053 305 - 350 80-85 Camaro, Truck, Aluminum
14096242 Bowtie, Cast iron, Dual carb pattern, No EGR
24502587 96- SB2 Lower Valley plate, Aluminum
24502588 96- SB2 Upper Plenum &Runners, Aluminum, Holley
24502653 96- Bowtie two-piece, 18deg heads, upper plenum & runners
24502653 96- Bowtie two-piece, 18deg heads, lower valley cover



Small Block Chevy Intake Manifold Casting Numbers
Years Casting CID bbls Material Carb Application
1974-76 340261 350 4 iron Q-jet A B F X/160,185,195,245,250HP
1973-81 340266 305,350 2 iron - A B F G
1982-85 340281 305,350 4 iron Q-jet B F
1976-82 346249 305,350 4 iron Q-jet all/155,165,205HP
1976-82 346250 305,350 4 iron Q-jet all
1973-77 346260 305,350 2 iron - A B F
1978-80 373598 305 2 al - G
1976-82 458520 305,350 4 al Q-jet all
1980-82 1403372 305,350 TTBI al cross-fire F Y
1955 3704790 265 2 iron - B
1955 3711348 265 4 iron - B Y
1956 3728725 265 8 al WCFB Y/225hp, 1st design
1986-57 3731394 283 8 al WCFB Y/225hp, 2nd design
1957 3731398 283 4 iron WCFB, 4jet B Y
1957 3732880 265,283 2 iron - B
1956 3735444 265 2 iron - B
1956 3735448 265 4 iron 4BBL Y /210hp
1956 3737109 265 4 iron - B
1957 3739653 283 8 al - Y /245,270HP
1957 3741193 283 FI al - B
1957 3746826 265,283 2 iron - B
1958-61 3746829 283 4 iron WCFB, Qjet B Y/230hp
1962-63 3783244 327 4 iron WCFB, Qjet B Y/250hp
1963 3794129 327 4 al AFB Y 340hp
1962 3795397 327 4 iron AFB Y 340hp
1972 3797771 350 4 iron - A B F
1962-64 3799349 327 4 iron AFB B Y/300hp
1963-65 3826810 327 FI - - Y
1956-57 3837109 265,283 4 iron WCFB, Qjet B Y/210hp
1964-65 3840905 283 2 iron - A B X C K
1964-65 3844457 327 4 iron WCFB, Qjet A B X Y/250hp, Srvc repl.
1963-65 3844459 327 4 iron AFB A B X Y/300hp, srvc repl.
1964-65 3844461 327 4 al Holley Y/350,360hp
1962-65 3866922 283,327 4 iron Qjet A B X/220hp/250hp, marine use
1966-67 3872783 327 4 iron Holley A B X/275hp, w/o AIR, srvc. repl.
1966 3875954 327 4 iron Qjet A B X/275hp, w/AIR
1965 3877652 283,327 2 iron - A B C K,trk
1966-67 3877656 327 4 al Holley 350hp Hirise
1966 3882858 283 4 iron Qjet A B X/220hp
1966-67 3890490 327 4 al Holley X Y/350hp hirise
1966-68 3905393 327 4 iron Q-jet A B F X/275hp
1967-68 3910601 327 2 - - A F X
1969-70 3916313 307,350 2 - - all
1967-68 3917610 302 4 al Holley Z-28, F, hirise
1968 3919801 307,327 2 iron - A B C X
1967-68 3919803 327,350 4 iron Qjet A B F X Y/250,275,325,350HP
1969 3927183 307,327 2 iron - A B F X
1969 3927184 350 4 iron Qjet A B F X Y/255,300,350HP, srv. rep.
1969 3932472 302 4 al Holley Z-28, F, Hirise
1967-69 3941126 302 8 al Holley Z28 X ram (bottom) released to race teams in '67 w/o casting#
1967-69 3941130 302 8 al Holley Z28 X ram (top) released to race teams in '67 w/o casting#, did have Winter Foundry 'snowflake" logo.
1969-70 3958622 307,327 2 iron
1969-70 3958626 350 2 iron
1971-72 3959594 350 4 al Holley Y, Z28, LT1, Hirise, 330/255hp
1970 3965577 350 4 iron Qjet B F X/300,350hp
1970 3972110 350 4 al Holley Y, Z28, LT1 360,370hp, Hirise
1970 3972114 350 4 al Z-28, F
3972116 350 4 al Holley hirise, service repl for '70 LT1
1971 3972361 350 4 al Holley Z-28, F
1969-71 3973465 307,327 2 - - A B F X
1971 3973469 350 4 iron Qjet B F Y/270hp
1969-70 3987361 350 - iron -
1971 3990948 350 - iron -
1973 3991004 350 - iron -
1971 3991005 307 iron
1973 3997770 350 4
1973 3997771 350 4 iron Qjet all/175,190,245,250hp
1973 3997772 307 - iron -
1972 6262928 350 - iron -
6262930 - iron Y
1972 6262932 350 iron -
1971-72 350 4 iron -
1972 6263751 350 4 iron Qjet all, 175,200hp
1973 6271060 350 - iron
1957 7014360 283 FI al -
1957 7014520 283 FI al -
1957-58 7014800 283 FI al -
1958-59 7014900 283 FI al -
1958 7014960 283 FI al -
1959-61 7017200 283 FI al
1959-60 7017250 283 FI al
1959-60 7017300 283 FI al
1960-61 7017310 283 FI al
1960 7017320 283 FI al
1962 7017355 327 FI al
1962 7017360 327 FI al -
1962-63 7017375 327 FI al -
1964-65 7017380 327 FI al -
1979-80 14007374 305 2 al -
1981 14014432 350 4 al -
1978-85 14057053 305,350 4 al Qjet Pass, Camaro, Truck