93turbo5oh

the stock intake runs out of plenum volume and cant keep up. 150 shot would make it pull over 7000rpm and make over 600rwhp.

NightTrain66

The cam is not really "that big" for a 385 and when you are making over 350 RWTQ in the 2000-2500 RPM range, you will be lucky to make HP to 6500 RPM. This is one of the trade offs for having a pretty streetable cam on a wide LSA.

These are LT1 heads. Not LT4, TFS. AFR, etc. The MCA on these heads are about 2.0" and will only make HP on a 385 until "so far" with a streetable hyd roller before the HP #'s level off and drop.

I am sure it is a fun ride even though the #'s level off and fall sooner than some would like.

Lloyd

1racerdude

A guy down here is running 2.0 valves in a LT-1 casting with a 383@13.3 static comp with a nasty solid roller(can't tell) and running 10.5's@3400lbs@7500 shifts.There is nothing wrong with those castings if done right and the combo is correct.
Ya ain't gonna run that fast with a CC306 either.

SS MPSTR

Aw, c'mon, we can't have our cake and eat it too?

Similar to what you stated earlier, a 420rwhp car is nice to see and will be a handful on the street, regardless of some of the internet racing community's opinion otherwise (not necessarily present in this thread).

The power levels of the work generated by the most reputable porters and builders is only a 'potential' and not guaranteed. Your results will vary.

SS MPSTR

Isn't 'as much as possible' relative to the users goals, budget, restrictions and combination? I'm not necessarily interested in starting a debate with you, but I think you missed my point.

93turbo5oh

if the end user is happy, i agree thats the most important thing. but its pretty easy with a big motor, a decent set of heads and an emmisions hydro roller to get 430-440 from a 383+ inch LT1.

SStrokerAce

I got the dyno chart earlier today from Lloyd.

350rwtq from 2000-6500rpm
400rwtq from 3800-5800rpm

around 420rwtq peak

over 400rwhp from 5000rpm up

The peak HP is at 6000rpm

Nice numbers Denny.

Bret

TCAL95Z

nice numbers!

SS MPSTR

Emissions HR in what state? Easy and still N/A? Not in California and others where the test is similar to the IM240 procedure.

93turbo5oh

im talking about IM240. thats what we have here in DFW. thats where all the cars i speak of have been inspected.

SStrokerAce

Taner,

Look up Total Seal QuikSeat powder... I've been able to get rings to seat really quickly with that stuff in a motor.

As for the rest of this post......

These numbers I still think are awesome to see, I had Lloyd touch up a set of LT1 heads for a carbed 383 with a single plane. 2.02/1.60 valves and 268cfm on my bench and the thing made 592hp on the engine dyno. Once you tweak a combo like this as Denny did you can really find some good power.

Bret

BRENTT94Z

Congrats Denny on the Tuning, and Hp gains.

Denny McLain

Geeze....... thanks everyone! Didn't realize what I started. It was just meant to be an example of what basically anyone can expect and to thank Lloyd for the work he did for me.

The power falls off because the casting and valve size is not enough to support higher rpms and the car was taken to 7000 rpm where most people only go to say 6500 rpm. It just looks worse than it really is because it was taken that high. That's also the reason I'm going with bigger heads is to get the powerband better on top. After all, these are “economy” heads.

Again..... this is nothing that anyone on this board cannot replicate using easily available parts if you're very careful to as many details as possible. I may have a bit of a tuning advantage as I'm getting close to a 1000 tuning pulls on my own cars but any good tuner can do the same thing if they take the time. You can see on the lower scale how much tuning I got done on Saturday and what another couple of hours did yesterday. So tuning helps.

I’ve been asked several times to do a complete mod post so instead of responding to each e-mail, I post them today. Don’t have an up to date list and looked at an old one that was about a mile long including AFR 227 heads, Monoblade, ect. Probably won’t work. I’ll do an updated one.

Denny McLain

I don't have any secrets. They were lunati rings. Have a set of J&E sitting in my garage ready to be put in but now I'll just wait till I do the complete bottom end.

Denny McLain

Actually I should also mention that Scott Whitehorn at A&S automotive is the one whom really figured out how to get the extra power on the top end so it never hurts to have a little help.

Scott tunes a lot of local cars.