How much HP in the LT5 cylinder head?

[rkreigh]

you bet todd and thanks for posting all the info on your build

quite an accomplishment. I believe I can count on "one hand" the number of ZR-1s over 700 hp.

hearing heads that flow up around 370 is really good news. I was there with the shop while yours were being done. no doubt they came out well as you are putting out great power

a 427 LT5 is a magical set of numbers

I'd like to go bigger bore on my motor but I need to wear out the one I have (it will likely outlast me!!)

daily driving the car now, I figured hey, it's got 80k, and more miles equate to more grins so like frank said

"who are you saving it for" nobody but me. the car is so much fun that the turbo z06 is "on the top of the rack" and the ZR-1 is getting all the attention.

there really is something special about the beast.

keep more details coming about your car todd! like to hear your experiences tuning on the radical cam shafts.

any chance you are making it to carlilse this year?

[Karl]

Lots of good information here thanks everyone for your participation!

[tpepmeie]

Originally Posted by rkreigh

keep more details coming about your car todd! like to hear your experiences tuning on the radical cam shafts.

any chance you are making it to carlilse this year?

Ron,
I just haven't spent much time tuning this car. I am this close to taking the motor back out and getting back on the engine dyno to fully map it. Until then, I am going to take it to a load-bearing chassis dyno to try to get it dialed in. There's a mustang md-1750 about two hours from me.

I replaced the injectors with Bosch (Ford) red 30lb'ers, and adjusted the calibration for the new injector characteristics. Should be enough for my power level. I just need to get the steady-state VE table mapped now. If you're interested, the Banish DVD's (and books) are really good info on how to map these things from scratch.

idles at 1100 rpm.

The motor is coming out again one of these days. Oil is getting past the valve stem seals. Not a big deal, except for startup. Fouls the plugs a couple times a year if I start/idle it too much.

OK, not the best daily driver but still pretty cool. 700hp rumbles.

[rkreigh]

yes, it's clearly defective, I'll take it off your hands

just kidding, I really would like to get the setup and learn to tune. I have some minor stumbles in the LSV at lower rpms that I believe are related to the low inertia of the fidanza combined with the big cams. but just a bit of throttle cures it just fine.

like to hear more about the job the newington gang did for you. they are pricey to be sure! were you satisfied with their work? they do some top dog pro mods and put out some nice looking stuff and have a great shop

[rkreigh]

hey Todd, any updates, were you happy with the price and work that the EPD (newington shop, may have the name wrong) did for you.

I know they are a bit pricey but really seem to know their stuff and have tremendous experience porting.

Pete,

what do you charge for the CNC port? I have the "old" LSV that I'm sure doesn't have very agressive porting.

like to try and get the car up to around 550 at the tire

it's tough keepin up with the Turbo Z06 and the ZR-1 is "jealous"

still like driving the ZR-1 more even though the Z06 has a number of engineering advantages. the ZR-1 has "soul" that is lacking in the Z06 and makes beautiful noises absent in the tupperware motor.

[tpepmeie]

Originally Posted by rkreigh

hey Todd, any updates, were you happy with the price and work that the EPD (newington shop, may have the name wrong) did for you.

Ron,
You mean RFD (Race Flow Development). I think he's moved the shop since then? Anyway, Curtis did a tremendous job on my induction system, but not sure he wants to take any more LT-5 work...too busy with other stuff.

We were over 350cfm through 39.5mm inlet valves. All that from only 35mm ports. The min-CSA is even smaller than that== they are high velocity ports. I told Curtis my hp goal, and engine specs. He assured me that the heads would make the power number, and they sure did almost exactly. I guess he knew what he was doing.

I wanted to go with bigger valves but Curtis said not to, else the port efficiency would drop and hurt power. Real happy with the combination of cams, heads, intake on this engine. Now it just needs a tune!

[rkreigh]

where are they now? I haven't been up there in years. like to talk to him again. he gave me some good insights on velocity, swirl, port shapes, and all kinds of things he was doing mostly with BB chevy builds which is what I was there for. I ended up buying a crate engine which unfortunately is still sitting around waiting to go into my 1971 Trans Am

I'm reluctantly selling it, plus my turbo buick, and the drag vette

need to reverse the cash hemmorage to get my daughter through college

priorities have changed, but I'm keeping the Zr-1 and the TT Z06

[XfireZ51]

Originally Posted by rkreigh

...
I'm reluctantly selling it, plus my turbo buick, and the drag vette

need to reverse the cash hemmorage to get my daughter through college

priorities have changed, but I'm keeping the Zr-1 and the TT Z06

Been there! Then it's getting them married.