Joined: Mon Oct 10 2005, 09:48PM
Location: Calgary Alberta Canada
Posts: 305
I pulled the engine last fall and posted my discoveries (cant find that post any more)... but here are the pics of the nice clean block. The crank was in excellence shape and just needed a polish. The bores were badly worn.
so far the the crank bearing clearances are perfect
Joined: Mon Oct 10 2005, 09:48PM
Location: Calgary Alberta Canada
Posts: 305
For a CR it will be 9.1 as I want to run this on just pump gas and not premium. I don't know the quench area. This is an exact match to another 440 that I built a few years ago. So far that has done well.
Good choice in pistons. I think this one is based on the six-pack piston,rated at 10.2:1 but with the larger c.c. will get it down to where you say. Interesting on the old original pistons is they had 4 valve reliefs,which was a good piston,but this remake has a good relief so i'm thinking flame travel may be improved over the old one,and as far as the coatings go this is an added bonus. I've used several sets of these speed-pro's in small blocks and are great quality for the money. Looks like you went crazy with the grinder on the inside of the block.....my fiends accuse me of doing this a little too much myself,but i love grinding anything.
Joined: Mon Oct 10 2005, 09:48PM
Location: Calgary Alberta Canada
Posts: 305
It was the guys that did the machining on the block that did all the grinding. I thought they were just going to remove some casting ridges but look like they got carried away.
It was the 915 heads and the tight chamber cc that cause us to mill out the pistons. I think with those pistons and the 915 heads I would have been well over 10 CR so I had to do something.
It's awesome to see a machine shop do this as they look like they take pride in their work. A lot of guys talk the talk....but only a handful deliver! Nice work on the valves. The bottom end will pick up just from a simple back-cut.