True, considering the F1A is probably taking 75hp or so to drive at 7000rpm, lot of stress on the front of the crank thats for sure. It amazes me how well the stock cranks hold up in these..

 

What main caps were you using?

 

trust me, i've got more than a few already. But i think lately it's because of Tom

 

stock block, crank, and caps.

 

y2khawk=bad ***!

 

So now the Q is... 5.7 or 6.0 ??!! Lol. You guys tell me. I need to decide SOON.

 

I was under the impression you couldn't use the 6.0 crank in certain applications. Someone enlighten me if I'm incorrect.

 

Early 6l cranks 99-00 will not work.

 

I know this thread is a month old now...but I'm more afraid of a stock crank letting go of the flywheel on me (and me then losing my feet/legs) than anything else...thats why I got a forged crank for my build. I know that the Gen 3/4 cranks are WAY better than older small block cranks were...but I saw a friend of mine's car (C4 Vette) get totalled to something involving the flywheel and crank (I don't know what let go first, his flywheel or his crank)...but it was enough for me to say I'd go to a forged crank and billet steel flywheel inside an SFI bellhousing on anything I'm going to rev high or make power with.

 

I wasnt worried about that because i didnt have a stock Flexplate and had an SFI bellhousing.............

 

Why? Isn´t it the same as later models?

 

Up, can someone answer why i can´t use the -99 crank?

I´m starting to assembly my engine soon...

 

The early 6.0 in trucks used a crank that was extended in the flywheel area to make the connection to a 4L80E easy, the exception was the Escalade LQ9 that had the same dimensions as a pass car. The extended crank could be used with a turbo 400 or 350, but because it is odd you are better off not to use it.

Kurt

 

I was gonna go with a TCI flexplate and I have a ultrabell on my th400. Im so crazy im wondering if i cn get a shield around the ultrabell! I've grown attatched to my feet over the years and like them where they are. lol

 

I have TH400 gearbox..
But it will hold for the same as the later year cranks?

Thanks for the information!

 

From my understanding of the rules..... if your going to tack that car and she run's in the 9's... you will need the ultrabell, SFI Flexplate and a shield or blanket.

I have all of them......

No stock Crank anymore either....

Kyle

 

okay question bout my LT1 355 build then. reading this makes me feel better about reusing my stock crank for my blower motor rebuild. I have forged rods/pistons,keyed stock hub,arp bolts/studs throughout the motor. i'm looking to make 500rwhp with a T-trim. this is not a track car and don't ever plan to have it be,so would i be fine with a stock crank (1994 z28) with like only 1000 miles with the blower and 30,000 miles all together from stock. also could i use stock main caps with arp studs. since i'm not track racing the car i'm not concerned nor do i have any idea about changing how high the motor rev's.

Also reusing my 4L60E and stock flywheel(do i need a to upgrade to a SFI bell housing?

Thanks

 

Yes 94Blownz281 , you can make that power easy or a stock long block , why not go for 600 or 700 HP your combo with 12 PSI and a good cam will do it , Is your motor together yet?
did you pick a blower cam, heads?

 

So my stock crank,stock main caps,stock flywheel bellhousing will be fine then? well i think i would need to up grade some more things to go above 500rwhp. i don't want to high jack this guys thread so i will pm you some more details. motor is not anywhere near being done.

 

so if i was concerned about my bottom end letting go i would just need to get different connecting rods and pistons.???????