[BMEP]

Are LT1 injectors sufficient for a 600whp NA E85 416 stroker, 6800-7000 max RPM?
I know they flow enough for 550whp 6.2 NA E85.
The cam will have +32% fuel lobe.

If LT4 injectors are needed, is the vehicle drivable without a tune? I’m wondering how to properly break it in and seat the rings before driving it to the tuner.

What compression ratio are you guys running with E85 and only occasional 92 gas?

Any experiences you’d like to share with the different 416 stroker kits, brands, piston brands, rods, cranks, build issues, etc… is welcome.

This is a DD C7 M7, autoX occasionally.

Thanks

[KingLT1]

Should be ok...no you never run an engine with different injectors without adjusting the injector flow rate table in the ECU.

[cmitchell17]

I usually run my ~12.95:1 on E85 probably 99% of the time. I have run it on 93 before and in most situations, it seems ok, but I never really logged it to see how much knock retard there was on 93. With the TC locked at low rpms while going up hills on 93 though it will start knocking where you can hear it in the car. Does fine 100% of the time on E85 which is around 65-75% around here.

[sr71bb]

Originally Posted by BMEP

Are LT1 injectors sufficient for a 600whp NA E85 416 stroker, 6800-7000 max RPM?
I know they flow enough for 550whp 6.2 NA E85.
The cam will have +32% fuel lobe.

If LT4 injectors are needed, is the vehicle drivable without a tune? I’m wondering how to properly break it in and seat the rings before driving it to the tuner.

What compression ratio are you guys running with E85 and only occasional 92 gas?

Any experiences you’d like to share with the different 416 stroker kits, brands, piston brands, rods, cranks, build issues, etc… is welcome.

This is a DD C7 M7, autoX occasionally.

Thanks

Well I run LT4 injectors on my LME 416 stroker. AMP did the tune allowing for the injectors, the 103MM NW TB, Gwatney Performance NFC Cam, ported heads, ported MSD manifold and roughly 14:1 compression. The car would definitely NOT be drivable without the tune. I run E85 all the time which really measures out to about E80 at the place I normally get fuel. In fact, normally you would NOT run this cam without a higher stall convertor but AMP was able to tune it where it is extremely drivable even as a daily driver which it is.

Here below is a general list on my 416
MISC info on Engine Replacement
The following parts were used on the NEW 416 engine install. I mention this because these parts can be expensive and you need to account for these should you ever go this route yourself.

NEW GM Oil Pan (Original pan was damaged)
NEW GM LT4 Oil Pump (NEVER reuse an oil pump on a failed engine)
ARP Head Studs (not required but advisable for 14:1 compression)
LT4 Head Gaskets
NEW GM LS7 Lifters
Chromoly Push Rods
NEW Front Seal
NEW Crank Bolt
NEW Cam Retainer Plate
NEW Timing Chain
CAM Phaser
AMS Break in OIL
OIL FILTER
NGK TR6IX plugs
LT4 Fuel Injectors
LT4 Fuel Pump

Below is a more specific set of soecs that LME provided

[BMEP]

Thank-you all for that information.

SR71bb, what are your cam specs?
Any dyno or 1/4 mile results?
It must be 700+ bhp depending on cam.
That must fun street car.

I’m thinking about the new 6.6L truck crank with 3.860” stroke as an option.
Could fit long 6.200 rods with 1.105 compression height pistons (same as used in 415 4” stroke) for a 9.235 deck. 9.240 is nominal deck height. Gives a better rod/stroke ratio and piston skirts stay in the cyl at BDC, but lose 12 cubic inches, 0.2L.
Decisions…