edelbrocks heads out of the box make 24 hp and raise the peak torque curve very nicly by 500 rpms. And there is even a small gain in torque across the board. So there is definitly gains in just doing heads. With there cam and heads u get 80 hp over stock though :]

 

Do you have a link to any dyno charts with the edelbrock heads? Sounds like you've seen, or had experiance with their results. I'd like to take a look at the TQ curve.

Dan

 

Wow, yeah I guess he has some new gears. 4.56 is too aggressive for me, but sure would help off the line. Looks like the only additional bolt-ons compared to me are the pulleys and e water pump. (and the tuning of coarse). It was on pump gas correct?

I might look into this a little further.

Dan

 

This is the torque curve with there heads and cam http://www.edelbrock.com/automotive/index.html
http://www.edelbrock.com/automotive/index.html
and the bottom is a link to there claim on the heads. I definitly believe they never lost any low end and only gained some because the heads are so well desighned and use stock valves and intake runners. The cam im not that extremly impressed with but never the less the combo is nice. The heads alone are probably what you are looking for.

 

Robvas is right 400rwhp with the stock cam and no forced induction isn't going to happen. You will see some gains with just ported heads (no cam) but only about 25% of what heads and a cam will net you. Not worth it IMO. Also isn't a cam still considered part of the top end? Your original post made it sound like it was part of the bottom....

 

If I do heads, I plan on going with Lloyd or Phil, like you mention. I'm just trying to find any info to determine what gains heads will get by themselves. At least the Edelbrock heads have some results to look at. I wish I could find someone with a set of Lloyds or Phils heads on a stock cam just to look at the results.

Eventually, a forged bottom end, mild cam and blower would be optimum, and exactly what I'm looking for, but right now it's more $$$ than I want to throw down.

Oh yeah, and when I saw the suggestion that 400 rwhp is possible with the stock cam, bolt-on's and heads, I dismissed it. I know it's not possible.Guys are lucky to hit that with a great set of stock ported LT1 heads and aggressive cam.

I'm kind of making myself look ignorant in this post on purpose because I want everyine to give their opinion, without me jumping back at them with reasons why they might be right or wrong.

Dan

 

You can make some nice power gains by just bolt-ons and a really good set of ported heads, and when I say really good set of heads, I mean a set that’s prepared with the intent on running a stock or close to stock profile camshaft. I was talking to a head port just recently about this who happens to port heads for specific class races and I was told that the heads need to be ported a certain way, working on low and mid lift along with very high velocity rates, he said that the heads would tend to actually lose flow above .500 lift from the way he prepares them, but these heads produce tons of bottomend. Just look at any of the super stock classes, NMRA real street and many others. You can go fast with stock cams.
Myself, I’d go with an aftermarket cam, there isn’t any rules on the street

 

Yes pump gas.

Speaking of HP, this car was dynoed too, but for the life of me I cant remember what it put down. I want to say it was 34X something, but not 100% on that

 

Hey All! sorry to bring a thread back from the dead, but ifugred its better than starting a new thread. I am just wanting to port the heads as i have come across a spare set. My engine has 164,000 miles on it and if i do a cam I might as well rebuild the engine, but that much money isnt available. I was going to port them myself as I have some porting experience and was wondering about the gains. I DO NOT plan on hogging the heads out and creating an issue of flow but rather a pocket port, bowl blending, basically gasket match. 1.6 rockers will be going on as well.

 

I have a stock cam ported head 95Z.

355ci, balanced and blueprinted, protru forged pistons/floating pins, stock crank,rods and cam, new GM lifters, ported heads, 1.6RR, stock intake, BBK52mm, trickflow elbow, hi-flow MAF housing, K&N, ASP pulley, edlbrock shorties, Random Tech Cat, Edlbrock catback, A4, 3.23, and plenty of datamaster/LT1 Edit for all driving points...part throttle and WOT..... and passes Georgia emissions...

It runs excellent at all driving conditions, gets 22 average, and I have seen as high as 26 on the highway.....

 

did you notice significant gians from the heads?

 

I can't say how much the ported heads alone contribute to more power, but I'm sure it's worth a few HP....

 

Vintage,

Have you had a chance to dyno your current setup?

I'm glad this thread was brought back, since the original question was never really answered. I'd still love to know what a good set of ported LT1 castings will add to a full bolt on LT1.

Dan

 

No dyno yet.....I need to go in and test a program to prevent downshift to 2nd gear at 1800rpm or higher. Maybe within a month or so.....

 

I doubt that. My bolt-on 104 trapping car went 112.8 after a cam swap and 3.73's thrown in. Gain of over 8 mph with the cam and gears.

That outperforms your ported head stock cam car

I know this is an old post, but I figured I'd make the point.