John Dirks

I understand if you bore 0.060, and stroke to 4.25,
A 454 becomes a 496.
Has anyone done this, and what kind of HP/TQ numbers have you seen?
Pros? Cons?

Corz

by the title i thought you were talking about something else... j/k. I have seen a 454 in a 65ish vette around my area. he says its stroked and bored to 496 and supposibly (sp?) makes 550 hp on 10.5:1 compression. i didnt even ask for TQ

68427

I have a 4-bolt 454 block bored 0.100 over, 4.25" stroke crank, eagle stroker rods (1/8" longer than stock), JE pistons and a Crower mechanical roller cam, .650 lift @ 108 degrees. Last year I ran it with heaviliy modified iron oval port heads, but have now changed to Brodix BB1 so I can run on pump gas with my 10.7 to 1 compression pistons. Displacement is 505.

The motor is a torque monster, with the iron heads it could spin the 335 BFG R1 tires on a roll in first or second with 3.08 gears. I don't have the car sorted yet due to conflicts with work but I anticipate the new heads will work much better.

Crank will fit in the block with minor work to pan rails, windage tray and clearancing of the stock pan.

Good luck.

John Dirks

Chevy High Performance Sept. 2001 says:
"the 496 is capable of surprising power numbers. We have seen 660hp/496 combinations".

John Dirks

Bence, are you thinking of this route to big HP?

bence13_33

John:
That was originally my plan, but after talking with MoMo I changed my mind. I already purchased my 6.135" forged rods. As it turns out, how high you can rev your engine is determined a lot by your rod/stroke ratio. With the 6.135" rods I could only rev the engine to about 5700RPMs (could probably do 6000RPMs...but would be pushing it). The lower your rod/stroke ratio, the higher the piston speed. Running a 6.135" rod with a 4.25" stroker crank, creates a lot of piston speed and stress on the rod. As I said before, I could have gone to a longer rod...but I already purchased my forged rods. Basically a 454 is already a stroked 427...by stroking a 454 you are essentially "double" stroking a 427. With the stock 4" crank, I'll be able to rev my engine to 6700 RPMs without any worries.

gkull

Bence13_33 496's through just under 510 ci motors have no problem spinning high 7000's all day long. My endurance race boat ran for years without a teardown with 12.8 C/R and hilborne injection and @ 1000 hp. Today my old 509 or what ever the ci is exactly is in a low 9 second 67 Camero prostreeter 2500 lbs. He's been running it 3 years to 8000+ rpm.

If you have the money or need a new crank shaft for what ever reason stroker motors are a fun way to go.

norvalwilhelm

I have a rat test in front of me. It consists of a 496 using stock 454 pistons milled .100 a comp cam 288 Street roller, 9.2 compression and 850 double pumper , oval heads. 612 HP 570 torque.
With a hotter 296 street roller cam, 9.7 compression, 1050 dominator 666HP and 566 torque. Heads rectangular port.

GDaina

Have std bore 502 block, internally balanced 4.25" crank, 6.385" rods, JE pistons.

No problem spinning to 7k, but shift at 6500.

bence13_33

It should be noted that I did not say that stroker engines can't be revved high. I only said that with the stock 6.135" rods and a 4.25" stroker crank, I would have to shift no later than 6000 RPMs or take the risk of things coming apart. GDaina, you have longer rods therefore your rod/stroke ratio is higher and gives you the ability to rev higher by reducing the piston speed. I just thought I would point that out, sorry for any confusion.