Went over to see that buddy of mine this morning and took some pics of the Caddy that he is building for his Pulling Truck. 7" Eagle Rods, Bulldog Aluminum heads, I think he said the Roller Rockers are a Ford application, even the pushrods look huge on this thing. I forgot to ask him what Intake he was using, but the oilpan is a custom sheetmetal job.
I forgot to ask what the CID would end up being. I think he said the Rods are actually for a 425 Olds.
Your connecting rods don't detrimine displacement.bore x stoke. having a longer rod keeps the piston at tdc and bdc longer which gives you a broader power band. I use to build race motors and a 350 with a 5.7 rod is still a 350 with 6" rods. Not trying to be a smart ***...just alittle tech
I'm pretty sure he said it was bored .030 too. I don't know what the CID is on it though. I guess I should have asked...
[ QUOTE ] Rod's are 1/4" longer, so that's what, an extra 1/2" stroke total? That's 558ci if that's true. [/ QUOTE ] A longer rod doesn't change or necessarily indicate any change in stroke.
maybe it's time for another tech post adressing crank throw, rod length, pin height, horse power verses torque and all that internal geometry stuff.. I can't imagine the torque that motor must put out! more then half a ton of foot pounds betcha!
Is that some sort of spacer under them heads? If he is whacking the rod length up maybe it is. Longer rods give less initial piston acceleration and absorb less power than a shorter rod. Plus give less side thrust on the piston skirt.
[ QUOTE ] Is that some sort of spacer under them heads? If he is whacking the rod length up maybe it is. [/ QUOTE ] If it is he didn't mention it. I imagine he had to use Pistons made to work with the longer Rods. Shorter distance between the wrist-pin and the deck to make up for the difference in Rod length maybe?
Typically with the Cad 500's, when they get longer rods, it's because the rod journals were offset cut to increase stroke, and needing smaller journal rods. I think the longer rod makes up for that... well, when it's used with custom BBC pistons with a higher pin location. Increasing the stroke, and increasing the rod length (higher pin) are supposed to help the engine build even power. I think the 7" rods and .30 over chevy pistions get it around 540, but you can get a stroker crank that will get you 570cid. I might be wrong about this, I read it in Street Rodder when they did a build up of a 500 a few years ago. I think it's in that cad500 book also. Anyhow, awesome motors, they seem to respond to basic rodding in spades.
[ QUOTE ] Is that some sort of spacer under them heads? [/ QUOTE ] Nope that is just the way the Bulldog heads look...
A guy we know here built the one I mentioned using the Buick pistons and 429 Ford intake. was in a '62 Falcon drag car formerly big block chevy powered...he switched in the 500 Caddy and on the first run it beat the bigblocks best time....but blew a tourque convertor. Replaced it and blew one again on the second and third runs....finally realized it had too much tourque for the convertor and took it back out for the big block.
Here's mine. 500, .030 over. Ford intake and other parts from Cad Company, other stuff from MTS. 415 horsepower on the ch***is dyno.
He said he bought most of his stuff from the Maximum Torque outfit. He is figuring over 500 horse, but no idea on Torque. Hopefully he takes it somewhere and runs it on a Dyno. I would like to see what kind of numbers he comes up with.
Yep, I was drooling over it! Thanks for posting this stuff... albeit on the high end, but it gives me hope that my motor will tow better than the garden variety SBC. I'm soaking it in... keep it coming, Sam.
The Jalopy Journal
