BUBBA

At least we all know how it was done now: "lighter weight oil man, it's the oil".

Denny McLain

Thank you very much. Your too kind.

Denny McLain

I'm kinda facing a deadline here. The race series I'm going to compete in has their first race March 19th and it's up creeping faster by the moment. Tuesday the car will under go the knife for the new heads so Scott and I decided to go with a new cam also to save time that we have experience with. It’s proven to make to make the bigger numbers with the type of flow numbers the new heads will have. And…… NO, I won’t tell ya the exact grind.

So that blows to hell my preaching of only making one change at a time but the race schedule won't wait for me. Sometimes ya just got to do, what ya just got to do. If needed, we’ll work out the cam some more when we have time.

FWIW…..Basically the car idles about like a LT4 hot cam (maybe not as radical even) but has a real different sound due to the exhaust system. I have both an X-pipe and a H-pipe and it has a higher more sports car pitch to it. It’s a sleeper for sure as it has resonators and the biggest mufflers on it that would fit so it’s not even all that loud.

FYI….. Bret Bauer designed a cam for me that I’m NOT going to use and it’s for sale. With the second revision of the porting the intake/exhaust ratio changed radically from the original specs. This cam should work super for anyone with around a 70% ration in a stroker motor. (most stock ported castings) and I’ll sell it for 300.00.

SStrokerAce

Denny,

Shoot me a e-mail of the new flow sheets, I'd like to see how the cam would balance out now in my total E/I% equation.

Bret

kmook

Pics? Where are each positioned, and why did you do that?

Denny McLain

Bret

Stopped by yesterday and was told what the preliminary numbers where based upon one cylinder done and the exhaust flow increased tremendously. They had to add a 1.625 valve to get the exhaust to flow correctly but it does now for sure. The ratio changed from about 70% to 75%. Low 300’s on intake and about 225 on exhaust @ .600 w/o using a pipe.

I’ll send you a private e-mail with the spec’s when I pick up the heads the end of next week. The intake is also going to be heavily welded/reworked and even the headers are getting the same treatment. Never had ported headers before.

Denny McLain

Ken

It's a 96 Corvette and if you want pictures, it's no problem as I'll take a couple this weekend and nuke them to ya. I’m not sure how you would add both to an F-body. My 97 SS had a true dual exhaust system and just getting it to fit was a significant issue.

The reason for both really has to do with a characteristic of the C4 which has an exhaust resonance between 1200 rpm and 1800 rpm inside the car. Had nothing to do with performance, but to see if it would quiet it down inside the car while cruising for a bruising. A little too much fiberglass.

We did however dyno the car with open headers vs full exhaust and there was absolutely no difference in power. Of course I also didn’t know the trick then of adding an 18” header extensions and how you pick up some power if you do.

Does make for a unique sound though.

kmook

I keep forgetting this is a y and not f body
If you ever get around to taking pics id like to see some.

Denny McLain

Ya the reason I hang here is:

A. I still have a few friends from when I was pretty active on the F-body list earlier.

B. The C4 Vette list guys are dumb as a rock.

Joes94TA

Denny what cam is in it custom??

SStrokerAce

The cam now is a GTP6

LT4POWR

and you are evil if you ever disrespect their beloved Hotcam

AdioSS

What size valves are you guys running in these heads?

Turbo6

Denny,
I've read through this thread and would like to say Nice Job on putting together a well-running setup using fairly common but good quality parts and making good power out of it! Like it was stated earlier, most people say BS if you make more than 400rwhp on LT1 castings w/a stroker because that is what most of the people here make. Your setup runs what it should with the mods, everyone else is just slower.

95Bird has done things similarly, using good parts and putting a well-working combo together that runs very well. I've tried to adopt a similar strategy when I picked out the parts for my motor, even down to the rings used, custom cam, etc. No sense in throwing HP away.

I will have my own car dyno'd here in the next couple weeks and am hoping for good numbers as well. I'm sure people will call BS when I post the graphs but that is the nature of things here. Keep up the good work and let us know what kind of #'s the thing runs.

Denny McLain

The valves in Lloyds heads are just regular 2.0/1.56 valves. The smaller valves in my opinion probably make the heads work better than the spec's would indicate as it takes greater velocity to pass the same amount of air through a smaller opening.