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Project89 10-27-2012 01:48 AM

gm rocket block
my friend had picked up an gm rocket block a few years ago

unfinshed bores and lifter bores
bbc cam bearings
400 mains
wet sump
tall deck block
max displacement is 455ci
i can purchase this block for 2,200 bucks , how stong are these gm blocks

reason im asking is i am building a 434ci twin turbo small block to run in x275
it will be 434ci 9.5-1 cr, with cnc afr 227 heads, solid roller cam , single plane efi intake with twin 66mm turbos

this combo is capable of 1000hp plus easy

with this block handle it or should i just buy a little m

Mr. P-Body 10-27-2012 07:27 AM

If a true GM Performance "Rocket", it will be fine. That was Oldsmobile's "version" (thus the name "Rocket") of the 400SB, raising the cam and using the BBC timing set. The tall deck allows for longer connecting rods, a "must" for high RPM durability. Several years ago, we built an 1,800HP blown/alcohol 434 using the Rocket block and "splay valve" heads. 9,500 RPM, lived fine, went 6.60s in a LWD.


E.Furgal 10-27-2012 07:48 AM

if it's a true rocket.. it's what the prostockers used..

FmrStrtracer 10-27-2012 08:02 AM


Originally Posted by E.Furgal (Post 1603716)
if it's a true rocket.. it's what the prostockers used..

Prostockers used the DRCE I and II(Big Blocks)

The Rocket Block is a small block

vinniekq2 10-27-2012 08:35 AM

there used to be a pro stock truck series that raced small blocks.I dont know what blocks they used though.

E.Furgal 10-27-2012 09:35 AM

it might have been the trucks..

could've sworn jeff smith showed a warren johnson bullet rocket block based mill in the early 90's

68NovaSS 10-27-2012 09:59 AM

There were pro stock small blocks back in the day, around '72 - '81, then again in '98 for the trucks, mostly 358 far back was the Rocket block produced?

E.Furgal 10-27-2012 02:24 PM


Originally Posted by 68NovaSS (Post 1603753)
There were pro stock small blocks back in the day, around '72 - '81, then again in '98 for the trucks, mostly 358 far back was the Rocket block produced?

this one was iirc late 90's

Project89 10-27-2012 03:03 PM

thanks guys i am not familiar with the rocket blocks at all
i know it needs a special oil pan since the oil pan rails are spread, now i just need to figure out the cost of assembling it versus getting a little m block and see how much cost difference there is

vinniekq2 10-27-2012 06:56 PM

I paid 2300 for my little "M" in Canada

1Gary 10-28-2012 01:58 AM

Chevy Small Blocks - Engine Blocks

1Gary 10-28-2012 07:06 AM

I already did something similar with a bare casting Bowtie 4.3 block.I can tell you unless you have a machine shop your never going to get a bare casting completed as cheaply as one that is already done. And my point of the link is those do come in various models and costs accordingly.

joe_padavano 10-28-2012 09:43 AM

For those who don't remember, Oldsmobile heavily sponsored drag racers in the late 1980s. There were MANY Olds-bodied Super Stocker Cutlass Calais and Ciera cars with F.J. Smith RWD conversions using "corporate" motors. Olds designed the Rocket Block to fix many stock SBC shortcomings (as they did with the BBC in the DRCE motors). The "rocket block" nomenclature comes from the fact that there was an Olds rocket logo cast into the side of the block. It was never used for Pro Stock because the Pro Stock engines were 500 cu in by then, thus the use of the DRCE in that class.

Mr. P-Body 10-28-2012 09:49 AM

There is no comparison between Rocket and Little M. Little M is a very good block, made as a "replacement" block for the 400, only "tough". Rocket is a RACE block. Yes, ProStock Truck is where it was most widely used, IIRC. Virtually everything for Rocket is either custom made or hard to find. That's the "price" of a true race engine. Even a Chevy. Many big block components "fit", as I recall. A custom crank is needed to use the BBC timing set. There's probably some sort of sleeve assembly to make it work if not a "blown" application.

So, if you're looking for the least expensive way to make "big" power and "live", Rocket is probably not for you. If you want the ULTIMATE in SBC technology and the most "bang", regardless of "buck", Rocket is the way to go.


1Gary 10-28-2012 10:20 AM

Yeah-the biggest bang for your buck is related to how much he wants to spend. So getting right to the core of the topic,how much go you want to spend??. Trying to keep up with corporate sponsorship money is tough on your own dime.

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