If I stroke a 454 big block from 4.00 inch to a 4.25 stroke , do I have to do any block grinding to make the crank clear the block , any cam shaft interference also w/ this larger crank? I know theres a lot of hassle building a stroker small block but I've never messed w/ the big boys before. Any feed back on your thoughts about a 496 would be appreciated.
Thanks , Mitch.

All I can go by is that my 496 rotating ass'y dropped into my '74/'75 P/U 454 block with NO grinding whatsoever!! (I used stock truck rods and ROSS pistons..)

pdq67

PS., I even think looking back that it would swallow a 3/8" arm with no to very little hassle..

pdq67,
Along w/ the 4.25 crank do you have to bore the block to get 496 ci? How far can you safely bore a 454?

I'll probably be corrected but a 30 over 454 with a 4.25 stroke is a 489, a 60 over 454 with a 4.25 stoke is a 496.... graemlins/thumbsup.gif

I have read that if you can't stick a lead pencil between the cylinders by going through a knocked out freeze plug hole the block can usually go an 1/8th inch over!!

But to be sure, sonic check the cylinders at this big an overbore..

IMHO..

pdq67

Originally posted by Purs:
I'll probably be corrected but a 30 over 454 with a 4.25 stroke is a 489, a 60 over 454 with a 4.25 stoke is a 496.... graemlins/thumbsup.gif =
.060 over, .030 is a 489 ;)
There is no cam clearance issues & usually no of very little grinding involved unless you are planning on aluminum rods :D

And ditto on the sonic check if you want to go to 4.375 (+.125"),, I built a lot of 482's year's ago before I knew what sonic checking even was but I also put in a number of sleeves :D

I read in one of those "How to" books that you need a bow-tie block to install the 4.25" crank. Are you guys saying you can install one in a stock block? That would be great news because I have a stock block and hoping to stroke it in the future.

Yes, stock, 454 blocks are what we are talking about!!

The most plentiful are out of P/U's and such.

But watch the big trucks b/c some of them have tall deck 366 and 427 blocks in them.. Dump Trucks, Big delivery Vans, School Busses , etc...

You can tell if it's a tall deck 366 or 427, (there are no tall deck 454's), by looking at the pass. side top water pump bolt b/c it is like 3/8" to .40" down from the deck on a standard block whereas a tall deck has it about 5/8" to 3/4" down due to the .40" taller deck the tall deck blocks have...

pdq67

Whats it cost for a 4.25 crank? My other 454 that I'm taking apart now might be nice as a 496 :D stock rods,049's, and what pistons to get 10.5-1?

How about a 4.5 " crank , would that clear w/out grinding the block? How does a 502 get such a large bore and dont they use a 4" crank also?

Whats it cost for a 4.25 crank? My other 454 that I'm taking apart now might be nice as a 496 stock rods,049's, and what pistons to get 10.5-1?

I think you can buy a DragonSlayer for under $1000? Maybe, if I had it to do over again that's what crank I'd get. I'm sure someone knows a exact price but from what I here they are an awesome crank for the money.

Matt

Robert, I got the 496 rotating assembly from Speed-O-Motive for $1200 with steel crank, forged rods and pistons. The kit also included rings and bearings. With 781 heads my compression came out at 10.2:1. The block and the bottom of a couple cylinders may need some clearancing.

The 454's out of Pick ups, are there any years or things to watch out for that won't work out, or fit certain trannys, crossmembers, etc? Im shopping for a 454 builder - 496. tongue.gif

Originally posted by pnutkemist:
The 454's out of Pick ups, are there any years or things to watch out for that won't work out, or fit certain trannys, crossmembers, etc? Im shopping for a 454 builder - 496. tongue.gif I think really the key with finding 454 cores is to make sure you don't get a tall deck.

The LAST year for a 454 in a 1/2ton pickup, Suburban, etc, was 1976. After 76, ONLY the bigger trucks got a 454. But ANY of the 454s should be fine.

Originally posted by hamrdown:
How about a 4.5 " crank , would that clear w/out grinding the block? How does a 502 get such a large bore and dont they use a 4" crank also? 4.5" won't clear w/o grinding. A 502 is a different generation block its a 4.47 bore bc it cant go much past that and yes it uses a 4" stroke

Hey Wes,,,how does it perform? Have you had it to the track?

Why wouldn't you use a tall deck block???

Originally posted by TJC:
Why wouldn't you use a tall deck block??? I'm not certain, but I've always had the impression that if you use tall decks in passenger cars like a Chevelle that it causes things to be higher and therefore you have valve cover clearance problems with your heater box and power booster if you have one.

I'm gonna buy complete 454 block carb to oil pan this weekend. Its from a 1974 PU , according to the seller. Anything I should look for as far as telling if it definately is a 454. He only wants $350 for the whole thing and he's gonna throw in a complete 350 also , how can I go wrong!!!! This will be the block for my 496 build up and I will definately return for some advise on the build up!
Thanks!!

Stick your hand behind the damper and feel for the out off round balance pad and if it is there, it should be a 454!!

Also look at the top pass side water pump bolt b/c a low deck block will have it at about 3/8" below the deck whereas a not so desireable tall deck block will be like 3/4"!!

My core 454 that I turned into my 496 is a '74/'75 motor too..

pdq67

Whats the story on 454 EFI's. Those are fuel injected right? I basically just need the block and some misc parts. What all is different in this type of engine other than the manifold and carb?
:D I may have found a good price on one locally.

Originally posted by Rapid Robert:
Hey Wes,,,how does it perform? Have you had it to the track? Robert, haven't had it to the track yet. It will have a true 10.2:1 compression with 781 heads and 2.19 I and 1.88 E valves. The cam is a fairly mild solid with .560" lift, 242* @ .050" and 286* on a 110LC, a high rise dual plane, 1 3/4 " headers and an 11" holeshot converter. I'm hoping for high 12s in street trim. My car has either a 3.07 or 3.31 gear. Haven't pulled the cover to confirm it. I hope to fire it up weekend after next.

BTW, I will be heading out your way for a wedding in Raytown at the end of April.

Yeah stay away from Tall Deck's!!! Send them to me!!! graemlins/clonk.gif Please!!

Milan

The EFI's arent the tall decks are they? I want to see that "cheap street" smile.gif any pics?

No I dont believe Tall decks were ever EFI Motors.
You have Mail graemlins/thumbsup.gif

The new 8100 Vortec BB motor has a tall deck block and it has a 4.25" bore x 4.37" stroke!!

Plus LS1 type cathedral intake port heads...

But I don't think there's any speed parts like intakes for it yet?????

pdq67