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It's not "how much is too much". But "how often do you want to go thru it" and "what will your drive train handle"? Ya, race engines us those 4.75" and even 5" strokes. They also get torn down every winter. Some after every race. And with the torque they make what drive system are you gonna destroy with them. There comes a point of diminishing returns.
The power that can be made with 4.25" or 4.5" and a big bore with proper set up is still almost obscene. It'll last without having to worry about it. And while they don't make as huge a torque number their really not down on HP by any appreciable amount. |
Originally Posted by SkiDoc
(Post 4764448)
I took the the engines apart myself that Eddie rebuilt. The pistons were slightly “egg” shaped. They were not the originals and someone had knurled the piston skirts to try to snug the pistons up in the bore. The bores showed wear but not crazy. From what I observed I would say that pistons would be more of a problem than the cylinders since it was obvious that the engines had been through at least what should have been through 3 sets of pistons but yet retained the initial bore. I know he will build you a 598 in a heartbeat but prefers not to build a 632. The cranks, rods and bearings all were good. The big chief heads, and valve train components were about gone.
With a long stroke it seems the Pistons become a sacrificial piece in the power game as they get smooshed into the cylinder walls. On the bright side the aluminum is softer that the iron block so a hone and new pistons/rings and good to go? |
Originally Posted by MAXIMUSXXX
(Post 4764472)
I have 632’s and told by my builder they should be gone thru every 250-ish hours. Torque monsters and sound great. Motors came in boat and I was told they were Zul motors.
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Originally Posted by Baja Rooster
(Post 4764496)
How many hours on them?
With a long stroke it seems the Pistons become a sacrificial piece in the power game as they get smooshed into the cylinder walls. On the bright side the aluminum is softer that the iron block so a hone and new pistons/rings and good to go? |
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