1970 Z28 LT1 with blower horsepower? - Hot Rod Forum : Hotrodders Bulletin Board
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Old 05-27-2012, 04:11 PM
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1970 Z28 LT1 with blower horsepower?

How much power would a stock 1970 Z28 LT1 have with 7.5 compression blower pistons and a b&m 420 Mega Blower making 6-7 lbs of boost?

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Old 05-27-2012, 04:37 PM
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The "stock OEM 1970 Z/28 LT-1 motor had 11:1 compression and was factory rated at 360 to 370 HP depending on what car It came in.

WIth open long tube headers it will make about 390-410 HP
gets even better once the stock heads are ported.

The 1971 1972 low compression version 9:1 cr made 330HP gross
and factory net rated at 255HP (1972 LT-1)

The amount of power you will get by adding a lbwer to this motor will be dependant on the blower boost (blower drive ratio)

I would expect 450 to 490hp with headers and 7psi boost .

race gas allows the most boost and timing.
Pump gas will limit the allowable boost and timing even with a low cr on pump gas but it still will make very good power.
The stock Z/28 LT-1 heads (041,492,370,414) are a diamond in the rough and get a whole lot better with some porting
This motor is 550hp capable with some work

The later revised LT-1 cam is pretty blower friendly
242-254 .459 .485 116LSA .024-.028" lash
not bad at all for a street blower

The earlier cam 254-254@.050 .485 .485 114 .030-.030
The dontov 30-30cam is not very blower friendly and you are best to change it out.
Way too much valve overlap
If this is the cam in your motor, change it.

Again the later cam with late 1970- 71and 72 revised cam is not bad at all for a blower.
A true 1970 LT-1 motor could have either or cam.
Ya it matters.

There are lots of good off the shelf solid street cams that you can choose and bolt in including the later GM LT-1 cam.
So if you do got the .485in .485ex cam its an easy fix.

With a low blower friendly compression ratio it will easily run like a raped ape.
450+++hp
what is the cylinder head casting number on this engine.?

Last edited by F-BIRD'88; 05-27-2012 at 04:50 PM.
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Old 05-27-2012, 04:52 PM
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I see. Also, what is the most boost you can run without o-ringing the block?
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Old 05-27-2012, 05:09 PM
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F-Bird's answers are always thorough and very detailed. It is obvious that he puts a lot of time and thought into his reply's and it is very helpful.

Not trying to hi-jack, but I have read alot of his reply's and thought someone should acknowledge him. Thank you, F-Bird for your help and you are a true asset to this site.
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Old 05-27-2012, 05:23 PM
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Quote:
Originally Posted by 67CamaroRsSs
I see. Also, what is the most boost you can run without o-ringing the block?
Ususlly once you get beyond about 12psi its time to think about O ring ing.

Of course detonation will blow the gasket out of anything.
Best to avoid detonation.

You can make a ton of power at 12PSI boost with that blower.
If you plan to run it that hard or harder , use high octane gas.
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