Hot Rods XO/PP Bonneville project

Jimmy's Engine Service blown small block project,I know it's off the 640 topic but I could not resist posting this bad boy

 

It seams like I have been waiting on one thing or another for this engine.
Now waiting on some Glyptal paint to seal the inside of the engine to promote oil removal.
It's been 2 weeks now but I got an update on delivery
For this coming week.
I'm just glad we have time before we race at Arkansas in April 2023.

 

Things coming together checked bearing clearance on the mains .0025 to .0027
.008 on the thrust bearing
Block inside painted with Glyptal. Mains torqued to 95 lbs. Crank checked out with .0003 runout on the middle two bearing journals. Looking really good.love the Calico coated bearings

 

The rods and pistons got married together today,
Lifters checked and installed

 

Man those parts look really good! Wish you the best of luck!

 

Thanks

 

Work of art. I see a lot of hours in that crankshaft!

Lou Mangl***

 

Thanks Lou I have had lots of time waiting on parts so I have time for perfection lol..

 

They say the devil is in all these parts just waiting to rear it’s head as we try to hold him at bay with our theory and experience. I always have your confidence in mind as I look back on the Bonneville engines I built and kept him from touching. He got to me a few times but I’ve out foxed him too. Good luck John …

 

A little cam modifications to grind off the fuel pump bump and another object that was for a distributer gear that was not used on this cam blank. Not sure why it was even there

 

I do NOT know heat treatment of cams but hope heat from grinding has no effect on the cam

 

I kept it cool as possable and ground with a very light cut. It took over an hour to grind it off at that light pressure.

 

Sent you a PM

 

Well it never fails, I got the short block together only to find with the very last rod and piston going in as I rolled it over I noticed a tight spot. Rod was hitting the bottom of the cylinder bore. So everything comes back apart the bore gets clearanced. Then it had to be re washed and ***embled back together today.
It's good thatI saw this little problem before it became a really big problem. The gold coating on the pistons is a heat shield process from Calico Coatings

 

Converting a 292 y block timing chain set to work in the 262 it has cam timing adjustability. I also made the cam retainer as well I'll post some pics of that tomorrow

 

It turns out the cam is from a 262 which is a gear drive unit. The 292 y block chain will only work with the 223 cam that is chain drive.
So I have to settle for the gear drive.
However once we got it installed and checked out it has a 107 / 108 intake centerline.
Very exceptable indeed
As it was ground on a 110 cl and a wanted it installed at 106 cl boy I'm happy with that..
Photos to follow

 

Photos

 

A little history here.. I have used this degree wheel for over 45 years and it has more engine builds on it than I can count. It's done a great job for me for a long time

 

I have one of those also. Big wheel makes for a more accurate job.

 

You answered the question that entered my mind when I saw that Moroso wheel. Brought back some memories.

 

Today I checked valve to piston clearances .088 intake .102 exhaust.
.045 quench
Head installed and torqued to 105 lbs. Ft.
Love my ARP fasteners

 

I did not look at all 58 pages but went back trying to find picture of your combustion chamber, did not see one. I was surprised your head gasket shows so much space around pistons. Is your chamber that much bigger? Values shrouded?

 

65 cc chambers the head does not sit directly over the bore I'll look and see if I can find you a photo

 

Sorry Mike I can't find any photos of the chambers in my photos but I think I posted some in the thread in 2020

 

Go back and look at page 31 and go forward from there. lots of photos of the head development there

 

would love to see head gasket on head to get better idea how lines up with bore. I believe the chev 409 notched the top of the cylinder to let valves feed into cylinder better. Breathing must be hurt with top of cylinder blocking the valves. Guess all basic design of the engine your running.

 

If you look at the post I quoted you can see a faint line of the cylinder.
The valves angle toward the piston not the block.

 

This engine OEM design was basically a low RPM torque engine. It's in my opinion a tractor motor that was certainly not intended to be a performance engine.
Everything in this design was built heavy duty for strength not speed.
We have lightened up the recripcating parts and improved the flow numbers as best as possible. The head as stock only flowed 134 CFM and after extensive flow bench time and much port work it now flows 208 at .600 lift.
Nothing was gained after that lift.
So hp is hard to find in this type of engine however we did get 331 rear wheel H.P.
with the earlier designe.
We have changed cam shaft and are hopeing for around 365 H.P. at the wheel.
Our dyno sym program shows that potential as it did the 331 H.P. earlier.
We shall see...

 

There is always a surprise when building a new designed engine.
I had to pull the head and clearance the block for valves. Also checked the valves as they hit when I was rotating the engine to set the valve lash. So they got a fresh grinding and laped in.