little bit of progress

gordon

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Finally after a fairly long wait my custom pistons have arrived . I will take the Molner rods to the machine shop and have the small ends honed for pin fit. The long wait was due to most things just moving slow in the Covid times. I had a custom Mike Jones hyd roller cam for a sbc project also take extra time to get here. I should end up at 9.9:1 , I will mock everything up and cc' and measure. Will wait until next weekend to call Mike Jones to order the Cad camshaft. I would have bought pistons from Cadco but they did not have the size to fit my already bored block. Race Tech Pistons made what I needed. If I can figure out how to post pics. I will .
 

gordon

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These pistons turned out rather well only thing I might do different on next set is to add forced oiling to the full floating pin, have them cut for double spirolocs instead of the wire locs , and lay the angle of the eye brows back a bit. The eye brows I can do here at the house. I don't really need the forced oiling to the full floating pins but it is nice to have, and on endurance race engines in the past I nearly always ran the double spirolocs for pin retainment. Race tech did a nice job.
 

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gordon

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Found another Cad forum site and tried to register and it kept saying I was a spam and to contact administrator only to not find an avenue to make contact . Oh well I guess I am not allowed to join the modified Cadillac forum.
 

Darius

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Maybe those folks aren’t interested in your project but there are individuals here very interested!

Those pistons are simply beautiful!

best,
bro. d
 

gordon

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They are very similar to what Frohmader shows in his book "Big inch Cadillac" . They are not the usual 2618 type alloy I run in my blown engines, instead they are made from a 4 series alloy forging to be able to run slightly tighter clearance for the street but still have the toughness of a forged piston. I was going to buy from Cadco but they only wanted to sell what they had on the shelf and I would have had to rebore the block . For slightly more than what Cadco wanted I had these made to fit my existing bore. If you need pistons done to your specs I can certainly recommend RaceTech/AutoTech pistons. I had one other piston manufacturer get really upset with me because I would not have him make full dish pistons for me. He said I could make more power. I believe he is right but I wanted the squish pad design which seems to work well on low rpm torque engines especially when you can keep the piston to head clearance in the .036-.045 range . Besides at 65 yrs. old I definitely know what I want regardless of what someone else thinks I should have. I need to find a bent ,broken, cracked ,or blown up 950 casting head I can cut up to measure wall thickness to see how far I can go on these heads for porting. I anyone within couple hundred miles of Sacramento has one ,give me a shout I will come and get it.
 

48Austin

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Found another Cad forum site and tried to register and it kept saying I was a spam and to contact administrator only to not find an avenue to make contact . Oh well I guess I am not allowed to join the modified Cadillac forum.
Other Cad forum sites seem to be either be dead or don't want to be bothered with our insanity. Or stupidity.
 
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48Austin

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Don't remember seeing your threads. Of course I'm blind in one eye. And can't see out of the other.
 

Cadillac Kid 1

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If you are talking about the Modified Chapter of the Cadillac LaSalle club forum I don’t recall seeing anything from you Gordon, please try again.
Greg Surfas
 

gordon

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Greg I tried twice to register this morning. Each time it said I was spam and should contact admin. I looked all over that site, found no way to contact . I guess I have to be registered to contact admin to let them know there is a problem getting registered. Almost sounds like Abbot and Costello doing "Who's on first".
 

Big Cadoo!

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They are very similar to what Frohmader shows in his book "Big inch Cadillac" . They are not the usual 2618 type alloy I run in my blown engines, instead they are made from a 4 series alloy forging to be able to run slightly tighter clearance for the street but still have the toughness of a forged piston. I was going to buy from Cadco but they only wanted to sell what they had on the shelf and I would have had to rebore the block . For slightly more than what Cadco wanted I had these made to fit my existing bore. If you need pistons done to your specs I can certainly recommend RaceTech/AutoTech pistons. I had one other piston manufacturer get really upset with me because I would not have him make full dish pistons for me. He said I could make more power. I believe he is right but I wanted the squish pad design which seems to work well on low rpm torque engines especially when you can keep the piston to head clearance in the .036-.045 range . Besides at 65 yrs. old I definitely know what I want regardless of what someone else thinks I should have. I need to find a bent ,broken, cracked ,or blown up 950 casting head I can cut up to measure wall thickness to see how far I can go on these heads for porting. I anyone within couple hundred miles of Sacramento has one ,give me a shout I will come and get it.
Heres some pictures of a 120cc head. My experience is the 76cc head is the same intake port except for .250 longer in bowl at valve seat. All other intake areas have same wall thickness. I make the pushrod pinch 1.300 wide by moving both sides out. That leaves .080 wall thickness. Quality epoxy like Goodson prk99 allows for more width. I stay with .080 for street use. The exhaust port has thick area at turn in floor. I removethat to the line I drew for highlight in picture. Removing that material makes the 120cc head exhaust port similar to the 76cc head exhaust port. I have other posts on intake port face milling to make larger gasket area and port opening enlargement for custom intake manifolds on this sight. Also oil flow improvements. Good Luck with your Studebaker.
 

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gordon

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Thanks for posting the pictures that is going to help me a bunch on the cast iron heads.
 

Big Cadoo!

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Heres 120cc heads with roller rockers on 7/16 studs. If your using roller cam you will need a thrust washer bearing or torrington bearing. You will need to machine thrust face on engine block around front cam bearing the same thickness of the bearing to align cam and crank gear. Also improvement to oil flow from lifter clearence in their bores. A stock type build with flat tappets keeps oil problems in check.
 

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