ClarenceT

Taken from HERE (scroll down 'till you see the following)
Is this really that easy? I can port my heads, get some new valves, get that same cam, some rockers, new runners, port my plenum, LT headers - and I'll be putting down ~420tq/360rwhp? Seems a little hard to believe.....

luvmy92

I do not believe that is to the rear wheel...

Mike

Zix

ClarenceT

I do not believe that is to anything! That site shows no slips or graphs, just $1500 worth of crap from lingenfelter and 3 hours worth of work.

if it's really that easy, I'm buying all this tommorow.

HeeHaw89

Its a bit high, but not that inflated (if those are crank #'s). The crank hp by my estimation would be ~320-330, and the tq actually seems fairly accurate, maybe on the low side.

If they are trying to say its rwhp, it is total

luvmy92

This is what I was referencing. Those figures are not at the rear wheel... trust me on this.

Mike

rocco16

"Ported heads" can mean anything from a $100 cleanup to a $5000 flowbench/CNC/professional job by a big-name builder. It can also mean a power increase that is in proportion to the price.

There is so much more to making good power than throwing the "right" pieces on/in/at your block...

Larry
code5coupe

neat

I think those numbers are totally achievable with the stock L98, even at the rear wheels.

All the power comes form the heads IMO. A good set of ported corvette aluminum heads should be able to support that kind of power with out much trouble.

Look at an LS1. Cam and longtube LS1's are making anywhere from 360 to almost 400 RWHP. How can they do this with 347 cubic inches? The answer is the heads. LS1 heads flow awesome right from GM, but they aren't doing anything a ported L98 aluminum head can't do. Sure the bore and stroke is slightly different on the LS1, but it's not THAT different.

stevec4

It's interesting that over here (USA) that the power per liter of engine capacity is way down from what us Europeans have lived with and expect. There are many European and now Japanese vehicles that are prodiucing > 100bhp per liter. That means that with the right cam, head, headers and inlet system, the 350 (5.7 liters) should be easily capable of 400-500 bhp

I just sold my AMG 55 CLK in the UK and that ran a 5.4 V8 normally aspirated with 367bhp and that was as stock.

Someone will have to convert bhp to US hp as I beleive that a bhp is > US hp.

Steve

PS sorry 'easily' was perhaps the wrong word to use - 'expensively' should be read instead

Timmy!

Yeah, and the difference is $$$$$ - multi cams, 4 and 5 valves per cylinder and nice "ported and polished" heads from the factory, etc. The new GM 5.3L pushrod V8 in the trucks is making 300hp stock so that's not far off and you can definitely get more out of it. It's pretty low-tech compared to the European stuff. The American mentality is make a cheap and big V8 and you can get some decent #'s whereas the European mentality is make a nice refined V8 ($$$) and get a few more HP from a smaller engine. Also, the European stuff seems to use a lot more fuel to make the HP. (these are just my opinions)

stevec4

Yeh, you are sure right about the $$$. The average family sedan in the UK is now $30-$35,000 whereas here you can get something nice for less than $20k.

Not sure about mpg though - most of my UK cars have produced 30-35mpg whereas my Chevy Venture averages 19 (the gallon size is slightly different but only by 10%) - even the AMG was giving 27mpg and I enjoyed the hp with it.

I think the new engines are getting more "European" - and the one in the ZR1 of course was designed by Lotus (which probably means it's unreliable and expensive to fix LOL).

By the way, I'm flying back to the UK this weekend for a couple of weeks and have just been told that gas is now $6.87 per US gallon - luckily I drive a MCC Smart Car which achieves 67mpg from a 3 cylinder turbocharged 700 cc engine when there.
The Smart Car

MrNuke

Nah, that HAS to be at the crank.

I guess it is possible that porting the '89 Dports, that cam, 1.6rr's, modified intake (Large Runners), and lontubes would yield around 350chp. No WAY it is RWHP though.

Sounds a LOT like my combo right now, but I'm still using stock cam, 1.5rr's and superram intake and all the tricks and bolt-ons known to man, and I am right around 400chp with a tonn of torque.

One thing I have to add though. LPE does wonders with the Dport 113 heads, so getting 480+HP out of a 383 with them, a 219cam, and headers is not unheard of.