375 Y Block makes 613 HP with single 4V.

[Joe-71]

Another Y Block breaks into the 600+ hp range with my 2018 EMC entry after I have rebuilt it with a few improvements. I did a half fill of the block, honed the cylinders +.001, had the pistons coated again, new rings, went through the heads and intakes and roughed up the ports to see if it actually works. I re-ported the heads after CNC, and have worked the intake manifolds again to try to equalize the flow in the ports. This engine placed 2nd in 2018, and was one of the 5 of 7 that detonated itself to death on the dyno due to low octane fuel supplied when we were told the compression ratio was unlimited. Anyway, I have two of the new Mummert single plane intakes to try, and I have ported them for this test session, along with a well ported dual plane, and my tunnel ram. Three of the intakes and carburetor combinations made over 608 hp, and the single plane dominator was a virtual tie to the tunnel ram. Joe-71

[Joe-71]

This engine has a Mike Jones camshaft with 268/274* @ .050", on 108* lobe center installed at 105*, and .409/.395 lobe lift. Joe-71

[af2]

Fpipping awesome numbers with an old engine!

I think Mummert might be calling!

[CamKing]

This engine has a Mike Jones camshaft with 268/274* @ .050", on 108* lobe center installed at 105*, and .409/.395 lobe lift. Joe-71

I wonder how much more power a roller cam would make ?

[lgcustom]

A roller cam would indeed be interesting. However the Y-blocks use nail head lifters. Could it be modified to run roller lifters?

[frnkeore]

Joe, did you get any results on roughing up the ports and are you using the 1.54 rockers?

Mike, could you increase the lobe lift for the 1" lifters? I had Ben Herheim design a cam for me, with a lobe lift of .4375 and 260 dur, .9694 lifter dia.

He started with a flat head lobe and modified the ramps for a 1.6 rocker.

[Joe-71]

No roller lifters with a .500" diameter body that I am aware of. The Trend tool steel lifters have a 1" mushroom style foot that has a mirror finish, and can be re-used with another camshaft. Joe-71

[CamKing]

Mike, could you increase the lobe lift for the 1" lifters?

Yes, but as you increase the lift, you have to reduce the base circle, and if you don't add more duration, the nose radius gets really small, and you have wear issues.
The Base circle on the cam he ran, is already down to 1.100". The lobe designs are old NASCAR .875" profiles.

If the valvetrain is stable with the current cam, I could design profiles for the 1" lifter face, that are about the same lift and seat duration, but with more area, so they would act more like a roller, but still have enough nose radius, to not cause any wear issues.

[liqu]

Harmon and Collins made a roller setup for the Y lock Ford (good luck finding one now)

[Joe-71]

The block does not have sufficient material to bore out the lifter bores and have them not crack. These Trend lifters were +.100 longer to keep the barrel of the lifter in the bore at zero lift and not cock sideways. Stock length lifters have broken with small base circle camshafts. If you look at the dyno sheets, this engine was making over 600 hp from 6100 to 7100 rpm, and we did run it to 7400 rpm without an issue. Did not print out those numbers, but it was nearly flat on the curve, no nosing over or valve float. It would be interesting to advance the camshaft some more to see where the torque peaks and how the horsepower peaks. Not so easy to do with a Y. Joe-71

[PackardV8]

Harmon and Collins made a roller setup for the Y lock Ford (good luck finding one now)

Not doubting you, but sixty years of looking at Y-blocks and I haven't seen any way to do that or seen how H&C did it. Anyone have any pics/specs/ads?

[hoffman900]

Mike, could you increase the lobe lift for the 1" lifters?

Yes, but as you increase the lift, you have to reduce the base circle, and if you don't add more duration, the nose radius gets really small, and you have wear issues.
The Base circle on the cam he ran, is already down to 1.100". The lobe designs are old NASCAR .875" profiles.

If the valvetrain is stable with the current cam, I could design profiles for the 1" lifter face, that are about the same lift and seat duration, but with more area, so they would act more like a roller, but still have enough nose radius, to not cause any wear issues.

How much margin of safety do those NASCAR lobes have on a 1" lifter. I always liked the idea of a .875" NASCAR lobe on a vintage set up, especially due to lifter bores not being as dialed in as a NACAR block.

[Joe-71]

Here is a picture of the lifter bores with a .500 tube measuring the lifter angle. Notice how little material is left around the bar, and that is not enough to enlarge the bore to fit a roller lifter. The distance between the camshaft and bottom of the lifter bores has to be taken into consideration, also. Joe-71

[CamKing]

Mike, could you increase the lobe lift for the 1" lifters?

Yes, but as you increase the lift, you have to reduce the base circle, and if you don't add more duration, the nose radius gets really small, and you have wear issues.
The Base circle on the cam he ran, is already down to 1.100". The lobe designs are old NASCAR .875" profiles.

If the valvetrain is stable with the current cam, I could design profiles for the 1" lifter face, that are about the same lift and seat duration, but with more area, so they would act more like a roller, but still have enough nose radius, to not cause any wear issues.

How much margin of safety do those NASCAR lobes have on a 1" lifter. I always liked the idea of a .875" NASCAR lobe on a vintage set up, especially due to lifter bores not being as dialed in as a NACAR block.

Well, on a .875" lifter, they are within .006" of the edge, so on a 1.00" lifter they're .0685" from the edge,

[Walter R. Malik]

Mike, could you increase the lobe lift for the 1" lifters?

Yes, but as you increase the lift, you have to reduce the base circle, and if you don't add more duration, the nose radius gets really small, and you have wear issues.
The Base circle on the cam he ran, is already down to 1.100". The lobe designs are old NASCAR .875" profiles.

If the valvetrain is stable with the current cam, I could design profiles for the 1" lifter face, that are about the same lift and seat duration, but with more area, so they would act more like a roller, but still have enough nose radius, to not cause any wear issues.

There are a lot of 1" designs out in the marketplace for Mopar applications using mushroom tappets. Nobody seems to list them anymore.