The Resurrection: 94 Firebird Formula

[SSlowBoat]

catch can installed. track closed again tomorrow

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[SSlowBoat]

@8SEC6SPD Taner made me this awesome spark plug holder on his 3d printer. thank you again sir.

Started talking to @NightTrain66 about switching the cam up. this cam is super super super small, looking like the entire valvetrain may have to be substantially updated when i go to a larger cam. Thinking of staying solid roller, but a nasty one.
@Injuneer do you remember what brand valvesprings these are? i cannot find anything about them in the files/posts20221113_183938.jpg

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[Injuneer]

@SSlowBoat

The cam was spec'd to pass NJ emissions. They ran it on a smog dyno in PA and said it would. Unfortunately that decision was made without my input because I was stuck in Bulciago, Italy for work. I would have loved a thumper, and another 50 HP.

I think I mentioned when I was at your place that Second Street got their springs from PSI (Performance Springs Inc.).

[SSlowBoat]

looks like the rockers are older comp pro magnum stainless steel 1105 part number. they should be ok to remain with the new solid roller, along with the crower lifters

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[Injuneer]

Note that the Pro Mags are 1.6X on the intakes and 1.5X (or maybe 1.55?) on the exhaust. Second Street was concerned that the head flow on the exhaust was not high enough for the nitrous. They felt the bowls had been hogged out too much. So they used the 1.5X on the exhaust to achieve 0.590" gross (same as intake), with the option to step up to 1.6X if the found the exhaust was restrictive. Apparently they never thought the exhaust was restricting performance, because they kept the 1.5X on the exhaust.

The heads and intake were done by CNC Cylinder Heads in Pinellas Park, FL. The owner was Pete Incuado. He claimed to have been in involved with GM in the development of the LT4 heads. He was the one that told me that the reason the LT4 intake ports did not match the LT4 head ports was because GM ran out of money for the LT4 project and just left the LT4 intake internals the same as the LT1 intake, just added a bit of extra metal on top of the runners so they could be opened up. But GM never opened the runners up.

Pete told me to have Second Street run the intake when they flowed the heads. They flowed the head first, then bolted on the intake, and were surprised when the flow increased about 3% with the intake. Pete had also told me about running the heads on the pressure side of the bench to get a more realistic measure of flow capacity. He lost me there. But when the heads flowed so-so on the exhaust I told Second Street to contact Pete. I tried to contact him too, but he never responded to either of us. Was really disappointed that he cut us off.

CNC had also supplied the 5-axis machines to Lingenfelter, and Pete claimed he "set them up". There was another story that CNC was supplying heads to Callaway.

Just a bit of history from 22 years ago.

[SSlowBoat]

the head ports and intake porting is pretty nice @Injuneer !

atco rental got cancelled today due to cold, basically every local track including cecil is closed for the season, so i went for a ride, did a few pulls, picked up my daughter from school in it, then started tearing it apart.

ton of posts/people say you cant get link bar lifters out with heads on, well i wanted to see for myself. driver side lifters are out, guess i got lucky.
@NightTrain66 hydraulic roller cam please sir, lets make this thing sing in 2023

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[SSlowBoat]

the valve seals not so much, pulled #1 valve springs to check dimensions so lloyd can let me know what i can and cannot reuse, found both valve seals off the bosses, and exhaust seal ripped. Explains the little bit of blue ive been seeing.

cam is gonna be rowdy, to the point im probably pulling the motor to degree/check ptv etc

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[SSlowBoat]

gonna start pulling the engine this week. I have to check ptv/rod to cam clearance etc, i didnt want to pull the motor for the cam swap but better safe than sorry.

[Injuneer]

Was there any other apparent damage to the valve train? I know on at least one missed shift with the T56 the data log showed it hit 8,000 RPM. I had them check the valves after that and they said everything was OK.

No more solid rollers? You can use the knock sensor if they’re gone. Did sound nice though. I guess I liked the sound, and my engineer warped mind kept thinking torque x RPM = HP. The N2O supplied a lot of torque, so the high RPM made the HP even stronger.

[SSlowBoat]

Was there any other apparent damage to the valve train? I know on at least one missed shift with the T56 the data log showed it hit 8,000 RPM. I had them check the valves after that and they said everything was OK.

No more solid rollers? You can use the knock sensor if they’re gone. Did sound nice though. I guess I liked the sound, and my engineer warped mind kept thinking torque x RPM = HP. The N2O supplied a lot of torque, so the high RPM made the HP even stronger.

as of right now cyl 3 looks to have the seals rattled off the boss a little. Lloyd said ditch these seals, along with like 5 other people, i guess they suck to install and dont last long. otherwise so far everything looks ok on that side.

I am switching gears and prepping to pull the motor by this weekend. i have to get the cam out and get a base circle measurement to Lloyd so we can try to be safe on the custom cam clearing the rods as there is only 3 billet blanks in the country right now, and i want to get it ordered asap. i am trying to reuse as much valvetrain as i can, so he is seeing if we can reuse the retainers right now (i cant find this dimension retainer on manley's catalog, guess its been updated)

Lloyd convinced me to stay solid roller. its gonna be a helluva lot more rowdy than it was with this cam, and more rowdy than any other lt1 build i have been involved in. so i have to check piston to valve clearance too, that requires head pulling, which in car with studs is no dice. wish i knew the block measurements (deck height, piston in hole, etc) but we will get those figured out.

Maybe a compression bump if clearance allows. I am very happy i took this car from sitting for 7ish years to running 10's with minimal changes/maintenance/updating in the 8 months i have owned it.

I want to be knocking on the 9.99 sec door in 2023



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