BC

I would think that the pin could just be moved a bit, but all the kits seem to make the rod longer, of course, when the stroke increases. I'd rather use the parts I have as much as I can.

6.0-928S

The intake surface you show is a closed chamber, small port head. A torque head mainly. Used in '66 396 360hp Chevelles, 427 390hp Vette's, all hyd cam motors & some trucks. The other (blue) heads are open chamber heads. Can't see the intake side, but if the intake ports are larger, more rectangular shape then they are hi-po type heads. But they would still make plenty of torque on a 454.

Hammer

BC

Intake ports are the same hammer.

BC

Which ones should I rebuild and use? Any use in getting them worked on just a bit by someone who knows they can make a difference?

BC

This site has a 4.25 stroke crank mixed with a 6.135 rod and obviously a piston with the pin "lower"

http://www.rpmmachine.com/454-496-ca...roker-bb.shtml

6.0-928S

You could either have those heads ported (to better handle the displacement), or get a good set of the rectangle port heads without porting, (probably the cheaper route). I've been told that the small port heads when properly ported are very good all around heads although every BBC that I've built used the big heads. But that was to race. We're talking about a tow vehicle here.
If it was mine I'd get a price to port the open chamber small port heads & if it was too high compared to the price of a good set of rectangle port heads I'd get the larger heads & just set them up well. They're millions out there & cheap.

Hammer

BC

Is this good info?

http://www.hotrodders.com/forum/port...lp-111243.html

6.0-928S

It sounds good to me for the most part except........
1. 2.19 intakes are fine for a blown motor, 2.25 isn't necessary.
2. I would never mess with the short side radius of any motor I've ever built unless it was an all out race motor & then only if there was some deficiency in the original design.
3. I would never back cut a valve in a street motor.

My 2c.
Hammer

BC

I think I will stick with the Oval port heads to save the "funds" maybe for some other stuff that I will need. If I can keep the 6.135 rods but still get the 4.25 stroke, thats even better.

Hammer, or anybody think a 4.5" stroke crank would fit in this block?

BC

Interesting article:

http://www.maliburacing.com/patrick_budd_article.htm

6.0-928S

I don't remember exactly but I don't think you can go over 4.375 without substantial clearancing. How big do you want to go? The PAW catalog has stroker packages for this motor, & for very low cost. They're cheaper than Summit by the way.

Hammer

BC

It looks like they are. But I can't seem to find the non-kit pieces and thier separate priced. It looks like I can use the rods I have with up to a 4.25, but I may have to clearance something. I am sure thats big enough, since I don't think they have cast cranks past 4.25.

I am sure 496 is big enough.

FBIII

I'd use the blue heads. With the stroker engines you can run about 9.2 to one compression with a flat top piston. On a quench head a flat top is ideal. If you use the closed chambers you'd need a dished piston to keep the compression down. 2.19 intakes and 1.88 exhausts would be fine. The open chambers were designed to burn cleaner but they also make more hp.

BC

ORLY? I thought it was the other way around. Thats good, since there seems to be less rust on the open chamber ones.

FBIII

Take a look at any of the aftermarket heads. They are all open chamber.