Paul Workman

One of the latest examples of what was left on the table by GM, one of the FBI gang (Lee) finished some porting on his 5.7L LT5 and dyno'ed it at Funfest in Effingham. He posted a 441 rwhp @ 7200 rpm - on a motor that cruises in traffic and idles smoothly at around 850 rpm. Eat you hearts out C5/6 drivers! Some C4s might just be wolves in sheep's clothing!

Great numbers, LEE!

PLRX

Those are great numbers for a street ride.

96 Vette CE

I always liked the C4 ZR-1 and may just have one some day.

856SPEED

Yes, Ford took that technology and ran with it.....pushrods work as we have seen, but dual overhead cams with 4 valves/cylinder technology (especially forced induction) is just a powerful recipe and works great with higher RPM's; after all these are sports cars, right?..............perhaps costs to manufacture are the main issues.......

Vette Daddy

You may just be in luck! My 91 Turq ZR-1 may be up for sale soon. LOL

ch@0s

Cool

Paul Workman

Brett... Whatcha got planned? U putting that 427 LT5 in that creampuff plum-colored 95 ZR-1??? Awesome, that would be!!

mtwoolford

also packaging; overhead cam V8's just take up a lot of room in cars with increasingly smaller engine bays.

96 Vette CE

Are you finally running out of room?

89L98TPI

DOHC engines are to big for Corvettes. Have you seen under the hood of a new Mustang? The new Gen 5 SBC is amazing. GM is doing a Damn good job making PUSHROD engines.

mcm95403

Oh, how I'd love to replace my current 91 with yours..............

Vette Daddy

Seriously considering selling the Turq Monster, sans Dymags. The Dymags go to the grave with me.

May mod the 95 a bit. Stroker, brakes, exhaust, bling wheels (I-Forge Seneca's) etc.........

I want to build a copy of the 1959 Bill Mitchell Stingray. I can buy the body and associated parts from a shop in the UK. I already have a frame. I'd like to take an old FI unit and plumb it for modern fuel injectors and have the nostalgia "look". SB with at least 400hp, six speed.

Here's the car I want to build.

mnstrlt1

My 2012 mustang GT was likely seeing 410-420rwhp, on E85, and some easy bolt ons (and tune of course) and would spin to 8k. The boss 302 guys even ran those engines to 8,500rpm. Variable valve timing also helped. DOHC IS AWESOME! The only reason why I sold my GT is because the car itself was just "too" big for my taste.

My only complaint is the LT5 is ridiculously expensive to modify. Don't give me "well it's all aluminum block and exotic", Mustang Cobras have been running aluminum blocks since 96' on a DOHC platform with tons of aftermarket support.

Axial

I thought the complaint was weight...the LT5 is a 600 pound sucker!

lgaff

Still needs tuned, bigger exhaust.....video below....thanks Paul, fun stuff!!!

zr1fred

And needing that support. Fords DOHC V8s are not the most reliable engines. Huge,heavy, complex monstrosities that require a huge platform to hold them, and pressure systems to make them go. (and a large bucket to put the pieces in when they do go)

mnstrlt1

I'm afraid I'll have to disagree with you there. Ford SOHC V8's are incredibly durable, along with the DOHC variant (like the trucks, navigators, etc). I'm not trying to have a "brand" battle (in case you hate fords, lol). I've owned several vehicles from all camps, and I'm making an unbiased assessment. Physically, they are huge, but so are nearly all DOHC platforms (including the LT5). This is the "benefit" of a small block (traditional, LT, or LS). External dimensions make packaging simple.

Complex? Hardly.... Again, the Lt5 is far more complex (16 injectors, to kick it off), open deck decision (like the later GM NorthStar variants), odd starter placement, complexity of servicing the engine, common failure points, common gasket issues, etc. (referring to the northstars mainly).

Fords had plenty of time to refine the OHC platform, and they have.

I'll be the first to say I want an ALL MOTOR big cubic inch LT5, with heavily ported heads and cams... But when you price it out at $30k+.... My vision gets blurred... lol

I do support this thread, and again I congratulate the owner of this awesome example of an Lt5.

cv67

Good #s for a little "350"
Stock cams?

Strokers dont have to cost 30-40k sorry thats a straight ripoff
Problem is if you cant do it yourself or source parts youre stuck sending it to one of the few "tuners" out there $$$. Some parts are hard, if not impossible to come by. The ones that got it get what they want for them. That aspect turned me off to ownership. Fortunately when I needed something couple of good guys would always help out

If the owner of my old Z can finish getting his $ together Ill be doing a stroker for him next yr probably. Pass Ca smog, with cams
Bet its all done up right for under 10k.

lgaff

Cams are 225 236 415/425 intake 222 425 exhaust....

Still need to do some work on this one, tune, etc....

Paul Workman

You're missing the point... Like Dominic said, (in effect) Show me a stock, NA pushrod 5.0 or 5.7L (except for porting and headers) that puts down 430+ to the wheels and idles like a stocker...

Size-wise, you have a point. But, too big for Corvettes? What is a C4, if not a Corvette?? The 32V V8 DOHCs are big; no doubt. But, so is their performance! Ever see a Ferrari V12? They're not a small motor, and probably wouldn't fit under the hood of a modern Corvette either! But! That isn't what sticks in people's mind when one screams by!

Cadillac has a new DOHC 3.6L V6, forced air, making over 410 hp in street trim. And, the fastest cars in the recent 1/2 mile shootout in Chicago last spring...were 4-valve DOHC V6s...


Just sayin...