8 to 900 hp out of a 1st Gen. SBC Block.

[pdq67]

Is it possible?

What block?

pdq67

[AA Performance]

Australian Prostock are making 1100HP + 400 ci. so I supose it is possible.

[bigmike]

How about a 1200 HP 434?

https://www.shafiroff.com/chevy-drag-ra ... g-race.php

[steve316]

Dart block; shp pro or little M

[Little Mouse]

Then there's the block all 4 inch stroke should be used with the spread pan rail raised cam dart iron eagle.

[rfoll]

Vizard did a test with a stock block that made 1100 hp and the block deck split down the head bolt holes.

[tenxal]

This one time, at band camp.......

[rebelrouser]

Just from my personal experience, I will say this. OEM engineers designed the SBC for what 400HP ? So in discussing how much power you can make out of the engine, we are talking about exceeding the design of the factory block by 800HP? I ran big block mopars in my drag car for a lot of years in the 700 HP range, they held up OK for about 3 seasons, and then I would freshen them, three in a row the blocks had cracks, barrel shaped cylinders, etc. so they were just junk. The cost of machining a different stock block those three times would have paid for an aftermarket block, which I bought when they finally became available.
I think the topic should be not how much can you make, but how long can you make it at that level.
I helped a guy last year put together an engine out of a pile of used swap meet parts, it ran low 10's in a 65 Plymouth, and I was at the starting line last weekend watching him spin circles at the big end when the block gave it up. So I think I am done building stuff for people that may get them hurt. His car was OK, and only his pride and pocketbook was hurt.

[77cruiser]

How much was Santos making with there TA/D in the 80's? They were stock blocks weren't they? Wolfplace would know for sure.

[englertracing]

https://youtu.be/qX4lYYJCroI

On any given Saturday night there will be 30-40 of them with 800-900hp at your local dirt track.

The teams with alot of money have more than 900hp
Donovan and brodix blocks.
4.125 x 3.750
All pro heads and shaver/shaut heads.
0.750+ valve lift



800hp is about 30-35k
9xx can get up to 55k

Ps
Despite all that stroke they probably out rev a 302 or 327 by several fold. And turn 8500+ with ease.

[hoffman900]

What dimensions are shared with an OEM 1st Gen SBC block with the aftermarket blocks? Can they even be considered a Chevy for sake of argument?

From an endurance standpoint, one can look at how long they lasted in NASCAR applications up through the 1980s. Obviously power was more like 500bhp.

[dannobee]

Dunno about dirt track, but asphalt circle track we had a couple that split at around 600 hp. One split like Vizard's, one ripped the main webbing out of the block at the #3 main. These were GM stock blocks, not aftermarket blocks (by rule).

[englertracing]

What dimensions are shared with an OEM 1st Gen SBC block with the aftermarket blocks? Can they even be considered a Chevy for sake of argument?

From an endurance standpoint, one can look at how long they lasted in NASCAR applications up through the 1980s. Obviously power was more like 500bhp.

A donnovan sprint car block is avaliable with small or large crank journals.
An oem crank could be fit....

The camshafts are 55mm roller bearing jobs but the axial location of the cam bearings is purely sbc
(Cough the big bitchn chevy cam is about the same as an oem sbf.... or an LS)

The lifters and lobes can be shifted around as an option called the Glen styer shift to help fit your 9/16 pushrods.... but this setup isn't always used.
(Super bitchn.... no the port layout of the SBC is ugh.. squeezing two ports between the pushrods then you look at the middle of the head and see a gigantic wasted space.... could have had symetrical heads and tons of pushrod room. They banned the multiangle (Cleveland heads) long ago and ford Windsor stuff is starting to resurface and a few ls attempts have been made)


The camshaft is usually raised 0.390" to prevent you from having to run a baby core cam with tiny base circles. With the 3.750 stroke and big Carillo H beam rods. This takes a different timing set. But they use gear drives anyway to run the dry sump pump(front of gear drive), and the power steering, and injection pump from the back of the cam.
(Ohhh how exotic... wait a second how far from the crank is an sbf crank? More than 0.390 above that of an sbc oh boy....)

The head bolt pattern and gaskets are the same.
Any sbc head would be at home on one of these blocks
You could probably bolt on the first 263 head ever built onto the donnovan block

Bearings or more importantly bearing spacing, bore spacing, and bolt patterns are what make something what it is.

If it can take the crank and heads its definitely a whatever it shares those components with

[PackardV8]

Is it possible?

What block?

pdq67

Boredom overtook us once again?

If the ask is about GM produced blocks, as mentioned, it's horsepower X time. Someone mentioned breaking a stock block at 600 horsepower on a long asphalt race. Back in the day when 283"s and 327"s were being GMC supercharged and run for Top Eliminator, they did not last very many 1/4-mile passes.

[tenxal]

How much was Santos making with there TA/D in the 80's? They were stock blocks weren't they?

The ones I saw were Rodecks.