jayyyw

I won't say who but yeah, i was not happy when I saw that.

SLOW SEDAN

iTrader: (13)

That sucks! Such a dipshit move.

Last 1

iTrader: (2)

what size Piston and how much did they weigh?you are running a 4” crank? I’m Looking to buy pistons for 4.185 bore x4.125 stroke engine.Diamond only makes them in a 15 degree valve angle in a 4.185 and for a 4.125 crank .I’m looking for ls7 heads

jayyyw

These are 4.130" for the LS7 rods and 4.000" stroke. They weighed about 490g avg.

jayyyw

Comp has a higher lift version of the same lobe I am currently running. Thinking of moving towards that just to get a little more performance out of the current changes. Would go from .670" to .720, both I/E. Also debating on playing with the duration some. My cam is on HUC lobes.

DualQuadDave

iTrader: (6)

​​​​​​More lift is a good thing, but you are going to run into the limit of the stock rockers most likely. Maybe spend different $$$ and put a higher ratio rocker? Not sure, I would call Bullet and ask. When pushing the limit of valvetrain, they are the only guys I trust blindly. If you could get Billy G @ Comp on the actual phone, he could spec what you need for sure, but to just call the tech line, they are going to just read what the catalog says. Your combo is solid, I wouldn't make radical changes more than you are already doing w/ porting the intake/heads, etc. You probably have so much power wrapped up in a proper tune, you'll never really know how far the cam you have will go. JMO, I would leave it alone until you get it back together and get a proper tune and see what you got. Maybe talk to Darth on here, he is fantastic at speccing cams, as well.

jayyyw

agree'd

DualQuadDave

iTrader: (6)

Sorry, I had more to write, my daughter hit the post button. Read the edited post.

jayyyw

Yeah, I'll have to do a roller rocker for any more lift than I'm already running.

My engine builder is looking into a new cam. I was told to look into the LST lobes but can't find those published anywhere. Other than those, I'd likely stay with the HUC lobes since I know they are stable to the RPM I am turning. I have 2 specs that I came up with that I'd love to try. One with a little more spilt and one with about the same as the current cam. I also put in a cam spec request with GPI to see what they come up with. They build some fast stuff.

As far as the tune, I don't think there was much left there. I tried adding/subtracting timing and fuel in every section of the rpm range. 12.7 AFR and 27 degrees after 7000 made the most power. I smoothed the timing transition where I could and it made a huge difference in the curve. With that being said, I will let my engine builder tune this next setup, just to be sure everything is extracted.

jayyyw

Slight update: Finally got my heads and hi ram back. I ended up selling the heads, cam, and pushrods. Working with someone on some badass heads and a new cam. Staying hydraulic.

Shortblock is still in line to get done. Not rushing anything.

jayyyw

New cam is specd and ordered. $1000 valve springs purchased. Sent the hi ram lower to get port matched to the new heads. Shortblock is next in line to be built.

Hopefully just a few more weeks.

Last 1

iTrader: (2)

$1000.00 My I ask who makes the springs ?and what the spec on the springs? can you tale us what the lift on the cam is going to be?if you don’t want to share I understand.
from what I understand ever cam company out there soak there cam cores in snake oil,when you talk to them

jayyyw

I believe they are PSI springs. They are for endurance racing so they should last a good while before they need to be changed.
Seat pressure is around 200 and open is 700-800lbs from what i remember off the top of my head.
Lift is just under .800 with the Comp LST lobes

Last 1

iTrader: (2)

What lifters are you going with?look like most people are going with BAM this day and time.904 lifters bore size?with that much lift I would think your engine builder would recommend the 904 lifters.@ 800 lift were talking race car

QwkTrip

iTrader: (23)

Nah, Horsepower is cheaper than groceries these days.

DualQuadDave

iTrader: (6)

That's a lot of pressure on a hyd lifter. I know you are running Johnson's, might give them a ring and just ask what the longevity is on those at that pressure. I can say this, if your combo lives at those levels, I'm putting the same thing mine, lol.

jayyyw

Sticking with the Johnson 2126s for now. It's definitely not a daily driver anymore but will still be driven often.

jayyyw

I'm going to run them down to within .010-.012" max plunger travel and see what happens. Lots of research on YB seems to point to lots of people not having issues with a quality hydraulic lifter.

Floorman279

iTrader: (11)

185ish on the seat and like 500 open pressure is all the 2126 are rated at by johnson fyi.

they did say they have heard of them holding up to much higher levels with no issues but wont recommend it

jayyyw

Yeah, i remember seeing a post somewhere about someone running 800ish open? Of course its not something they would recommend, haha.