Building strong 914 tranny, Which are the most important items? Options

[yokesman]

this is a subject that would be helpful to me in getting the ball rolling on a project, donot like to start-restart without a clear direction.

there are several all aluminum 5.3 liter gm v8s available at reasonable ($ 600-$700 or less) (see car-parts .com)with the ability to provide 340 + hp . see super chevy 5.3 truck article.( without cam change).
vin z,lm4,l59,lh4,lc9 coded engines, also ls4 in the impala, granprix
the truck engines may require LS intake, truck is some 3 inches taller.

Richard

[messix]

early 327 block is 1967 and older. you can find the date codes here. http://www.mortec.com/castnum.htm
and here are the crank and jounal sizes http://www.mortec.com/journal.htm
the ls series i don't have much experience with, there are others that do. it would be a good idea to open another thread on this subject. i'm interested too!

[Bruce Hinds]

350 and 327 were both a 4" bore and the difference in the stroke was 1/4". 3.5 vs 3.25 respectivly. Some of the engines had a large or small journals on the crank and some had 4 bolt main caps and some two.

4 bolt bottom is better and you can make a 327 with a 350 block and a 305 or a 307 crank, not sure which one it was. Any of the chevy builders can tell you and I'm sure you can find out on line. OOps, don't forget to consider rod length!

B

[messix]

350 and 327 were both a 4" bore and the difference in the stroke was 1/4". 3.5 vs 3.25 respectivly. Some of the engines had a large or small journals on the crank and some had 4 bolt main caps and some two.

4 bolt bottom is better and you can make a 327 with a 350 block and a 305 or a 307 crank, not sure which one it was. Any of the chevy builders can tell you and I'm sure you can find out on line. OOps, don't forget to consider rod length!

B

i gotta correct some things here...

the early 327 had a 2.30 main bearing as opposed to the later sbc 2.45 all 350 and any other sb built after 1967, the 400 block was even larger at 2.65.

the stroke of the 350 and 305 is 3.48 not 3.5 .

while the 307 had a 3.25 stroke, it was a only had as a cast iron crank. that is why the 283 which is a forged steel piece is the great deal.

rod length for all but the 400 are 5.7. the 400 uses a 5.565 rod.


the short stroke of the 3.0 stroke allows for a sweet high reving motor and this can be built on a 2 bolt main for "street use" this would not survive a racing enviroment. i wish i could write this the same way that i could say it. a short stroke engine doesn't have to "throw" the rod/piston as far and a hard as the long stroke engine does. this doesn't stress the crank or block as much, so a 2 bolt main would be fine and still rev to 6,000 + with heads and a stable valve train.
new desings in valve springs and cam profiles along with the other peices are not super expensive and moderate priced stuff with last just fine on the street.

now i have to say that all this is on the first gen sbc, the lt series and ls series have there own unique set ups.


edit: all 283's had steel froged cranks that's another thing that makes them good.

[yokesman]

per wiki ,
4.8 and 5.3 gm engines share the same bore . the 5.3 stroked .
hence a 4.8 with the 5.3 all al block and 4.8 crank etc.- 295 hp-300 ft\lbs

[jimkelly]

oh - just get a brand new crate 350 and pop it in - jim

http://store.summitracing.com/egnsearch.as...+115+4294755930

: )