Yesterday my engine is starting to get rebuilt. I found a real good machinist here in Boise. Here's what they are doing.

Block is being bored .030
setting deck height to zero and squaring it with the crank
crank is being turned
the rods are being rebuilt and all made the same length
10.25 Egge pistons builder is aiming for 10.-10.2 compression setting quench to .040 he is going to recut part of the dish for compression reasons.
Rebalance assembly.
smooth and deburr all the oil runs
stock volume oil pump
Heads are getting pocket ported, cc'ed, relieved around the valve pockets to get the the cc's right for compression, the heads had already been cut once and have only 62 cc's now.
all new stainless valves and harden seats
gasket match on the intake and exhaust side
New cam 448/472 204/214 107
lifters
all new valve train
double roller chain
indexed
milling intake to fit
They are also building me the 200R4 with a 2000 converter.

I'm only aiming for 300HP and good performance at highway speeds as this car is going to be a vacation car.
What do you think??

 

If yall are aiming for a true 10:1 compression, then you might want to go with more cam. At one time my engine had high compression silvolites and an estimated 10:1 compression with the stock '72 455 cam (.435 lift and i think 194/207 duration). With 195-205 cranking compression, pinging was an issue and 93 octane was mandatory.

 

X2, too much compression for that cam on todays fuels, or not enough cam for that compression.

If you haven't bought the pistons yet why not get the 73-80 14cc dish ones form Egge. I'm sure they could make those for you. That along with your 62cc heads will give you right about 9.5:1. Seems like you're going thru a whole lot of trouble to try to achieve a compression ratio that's wrong for the rest of your combo anyway.

That 107 on the cam specs is the intake centerline not the lobe sep. And don't waste your time gasket matching the intake and exhaust when you're using stock manifolds. Don't need that converter with that cam either.
You'll still make around 300 if you do it right.


Jmo.

 

You guys have valid points, the tech that's doing this engine is actually aiming for 9.6 and retain the full quench area between the head and piston (we have talked about so many different combos that it get's confusing). The big bowl pistons eliminate a large percentage of this quench area because the bowl is so large and that can create it's set own problems. If the compression has to be 10 or above we will have to switch to a slightly larger cam. The idea of keeping as much quench as possible is to get a good mix in the chamber and combat pinging. As he says a 9.6 with quench will make more and smoother power than a 9.6 with almost no quench. That is my reason for taking the long way around the block.

 

I beg to differ. Take look at the rim of that 14cc dished piston. You'll see it's about 3/8 of an inch all the way around. Now look at the chamber diameter, it's very large as well. I'll bet you don't lose much if any squish/quench area by using a stock style 14cc dish piston.

And as I just mentioned on another post, dish pistons are fine. It puts the flame front down into it where many believe it does the most good.
And I hope he's not charging you too much for that cam, they're a dime a dozen, obviously there's a reason for that.
You still have a relatively small motor so something with less spread and on a little tighter lobe sep would give you better throttle response, 10.0:1 or not.


Jmo.

 

Who's your machinist in Boise? 350 or 455?

 

That cam is better for 9 to 1. The 2000 stall will work ok with that cam. A guy on OP has pinging with that cam at just over 9 to 1 in a 403. You will still should be near 300 hp even with 9 to 1 with mild head work and that cam.

 

I have a .510/.522 227/233 cam with 10.25 to 1, and my cranking compression is around 170. That cam is way too small for that compression, IMO. However, you did not state your location/elevation, as that is a factor. Still, a larger cam will give you more power AND torque, still have good manners, and work better with that Cr. Might have a nice little "lope", too.

 

With that kind of setup, if you tossed in the cam the build needed id say you'd have no problem hitting 400hp. But then again, whats horesepower anyways? Torque's what Olds is all about anyways ^_^

 

I'm using Meridian Automotive, John is very knowledgeable. It's a 350.