leels7

Purchased a 1972 LS7 454 motor to put in my 1972 Corvette. My understanding is this motor was never put in a Corvette, but sold as a crate motor. I'm in need of the correct Holley carb that would have been sold with the motor at that time. The following is what I beleive to be correct.

Holley model 4150 850cfm dual pump
Carb list# 4493
Part# 3967487
R-4493A
Primary 6203
Secondary 6207
Center pivot float

If this 4150 base was used on different size carbs, would it be safe to say one could be built from the 4150 foundation if a complete carb is going to be a tuff find?

Regards,
Lee

redvetracr

would you like to own the correct distributor for a 70 LS-7 ? I got one.

leels7

Possibly, I haven't thought that far yet. Please let me know what you have. I believe this motor also used a transistor ignition.

LT1driver

LS7 was supposed to be a 70 motor option but never happened, a few motors sold over counter (crate) and put in cars. never an option for 71 or 72. motors were offered over counter by dealers however.

redvetracr

1111465...you probably won`t find it listed anywhere and yes it`s a ti

calwldlife

My book shows
R6239a or R6238a

leels7

Two big questions, condition and price. Feel free to call me at (425) 844-1189

Regards,
Lee

leels7

Curious where you found those numbers?

calwldlife

chiltons manual

I listed for 72
here is for 70

370hp R4346
430hp R4296A

redvetracr

perfect and expensive.....send a PM if your a serious buyer

vettesbydesign

I will add that I have the rest of the TI setup if redvetracr doesn't.

Kfmorgan

When I bought my LS-7 crate engine new in the early 70's, it did not come with a carb or an intake. I don't think that it ever did. It was a bare long block. You supplied all the accessories; Intake, carb, water pump, exhaust etc. What you read about the carb size and intake, is what was proposed, or recommended, if indeed they did put it in a production car. I used a Holley 850 double pumper, and an Edelbrock TM-1 single plane intake, and it ran quite well. At the RPM that it would turn, I'm sure that you could get by with a bigger flowing carb, and a more up to date single plane intake, and it would run even better than mine did. Good luck trying to find gas to use with that 12.5 to 1 compression ratio, unless you want to use race gas. That's why I retired mine to a corner of my garage.

LT1driver

Back in the day motors were NOT sold with carbs, that is a modern happening for crate motors.

Rebelrob

I inherited an LS7 and I think a 850 holley is what was used if I am correct. Ditto to the above comment about the compression, I wanted to install this but was reminded several times the HP would drop with a lower streetable pump gas compression.

hwcoop

That sure would have been sweet had they offered the LS7 in 70.
I seem to remember reading pre releases in the car mags of the day...460hp...would have eclipsed the L88's and ZL1 vette ? Guess we will never know now

Ironcross

LS7`s were neither supplied with carbs or distributors. They came as a long-block with valve covers, timing cover and oil pan.....Also absent was the intake and fuel pump...I have the engine in a 1968 Camaro and used a L88 intake with a 850 4 bore Holley...A 950 3 bore was also compatible with the open plenum L88 intake...I would use the 850 and the E Bay HEI with the tach drive. I used a 75 passenger distributor as a tach drive distributor was not necessary

How fast? 11.40`s at 120+

Rebelrob

Yep that was the advertisement, I think it was way north of 500 hp in reality. Be curious to do some research. I am sure an engine like that with I think the big rectangular port heads and 12.25/.5:1 compression would bound to put out big numbers on the Dyno.

PDQuikSS

They actually did come with a carb and intake 850 dp and dual plane intake #3933163 it was a winters foundry forging that what the one i have came with I still have the motor in my garage.

427Hotrod

The LS-7's never did that I ever saw....and I saw a lot of them. Racers bought them regularly. LS-6's had an intake usually.

JIM

pspicci

This thread is from 2009 but i will throw this out there. i have a old hot rod magazine from the 80's with an article they did of John Lingenfelter where he purchased one of these LS7 crate engines and did some testing. out of the crate he dropped the oil pan just to clean out and metal shavings then put it in the dyno - 489hp. then he tore it down and blue printed it and put it back together with all the same parts except he dropped the compression to 9:1 , back on the dyno - 510hp. then he changed the cam to a comp 305h hyd flat tappet and did some porting and his final dyno run it made 567hp. this is all off the top of my head but i know the hp numbers are correct.
Pat