will a set of aluminum corvette heads from an 89 work with little or no modifications on an 89 lb9 engine?

 

yes look at my sig.

Vette heads do not have EGR cross overs so if you need to keep your car emissions legal you will need a corvette intake base and EGR pipe. Otherwise many of us are running these heads with no problems.

 

Except for the intake, you will have to modify the center 4 holes on the base or get an aftermarket base that has both styles (most if not all of them do).

 

how much of a hp difference do u think there will be right now it is totally stock

 

By just swapping? Nothing. About the only gain you have is chamber design and valve sizes. And then they are aluminum rather than iron so since the compression ratio isnt changing, you are actually on the losing end of that change.

You really need to have some work done to the heads to get the benefits of them. As cast I dont really think its worth the effort of swapping them on.

 

well im buying headers, new cat, slp loudmouth new cam and a new throtle body, and probly a new prom so will the help any with that

 

Just curious, what will the weight savings be by going with aluminum heads as opposed to the stockers?

 

19lbs (assembled) vs ~45lbs assembled, each.

Thats for the L98 AL vs L98 iron.

Its not really worth the weight loss, unless you are looking for that last pound to shed.

 

Believe the alum L98 heads are 58cc while the iron ones are 64cc both having 1.94/1.50 valves.

 

Well I dont know about you guys, but all I did was port match and polish the Aluminum L98 heads on my LB9 and they made a huge difference. (i did not have to reshape the center bolt holes either) With the heads and a 2800rpm converter my car dropped .9 sec and gained 3mph. Usually you will loose 1-2mph with a higher stall converter and I gained 3. Now with the new 5 speed the car runs a trap speed of 98.5 mph (with a 2.2 60ft) where it only ran 93mph(1.9 60ft) with the iron heads. You do the math.

 

Not on a 305, and thats what he has. The iron CC is 58 and the valve sizes... I dunno, small. I think 1.84/1.5 but I never bothered to measure any or take note of it.

 

Sorry, my bad

 

I am looking into this for my LB9. If anybody sees a set of ported/polished alum L98 heads let me know. I have an '88 IROC. What all will I need to do to my intake, etc to make these work? I am not worried about emissions even though Massachusetts is close to CA in its emissions testing...good to know people . Let me know... Also, I am looking to do a cam. What would you recommend. I was looking at the Comp 262HR or 264HR. I also saw 1MeanZ has the LPE cam...how do you like that? What is the powerband do you think? Thanks.

 

Well as far as the LPE cam is concerned, I like it overall. If anything it is just a tad too large. I think this cam would be ideal on a carbed 305 with a little bit of converter and low gears. With 3.23 gears and stock unported intake parts the car was a turd off the line with the stock automatic and stock converter. I could floor it and it wouldnt spin untill it got up to about 2800rpm in 1st gear, then it would spin, kinda funny actually. When I had the converter with the automatic it ran pretty strong for a 305. Now with the stick, better heads, and ported intake it will make power to almost 5000, which is not bad for tpi, I am banking on going at least 13.7 on slicks. It also idles really awesome too. I havent scanned my chassis dyno sheets in yet but it made good power and torque from about 2400 to almost 5000. I think a tad smaller cam would be a little torquier, but now that I have a stick I dont really need that off idle grunt.

 

That's a pretty damn good time for a 305 haha. I am looking to do a decent stall this winter...probably along the lines of 2200-2400 and I have a shift kit. I am also planning on doing all the porting, etc this winter on break. I think my car will wake right up from its current configuration. I just basically have bolt-ons and I know for sure the stock cam is such a dog in these auto 305s. With port-match runners and plenum, alum L98s, nice cam, and a converter to match I think my car will be night and day. I only got a 15.4 out of the car as it is, course it was my first time at the track, but I was pulling 2.1 60s on street tires. I can't wait to beat up on some Mustangs I usually kind of feared to race cause of my "wimpy" stock 305.

 

Hey still workin on pickin out the cam for the 305...I'm going to have to ask if anyone knows what kind of lift the L98 aluminum heads can handle? I think the ideal cam would be the Accel 211/219 (@.050) cam with a 112 LSA and .499/.525 lift but I'm not sure if the heads are adequate for this kind of lift. Also, this cam is going for $370 which is a little pricey for a budget rebuild. Would you guys save the $100 and go with one of these?:

Cam______________Duration____Lift w/1.5____LSA
..............................@.050.........rockers

CompCam 262HR.......206/210.....0.450/0.480.....112
CompCam 264HR.......210/220.....0.480 0.480.....112
CompCam XR264HR....212/218.....0.488 0.495.....112

I looked at the advertised operating range also. Both of the 264 cams are advertised as 1200-5200, just differing configurations in duration and lift. Then the 262HR has an advertised powerband of 800-5000, but it's characteristics seem much less drastic to have a wider powerband. I think the 262 has the powerband I want, but does not give much lift and I don't want to lose power over that. How much of a power difference do you think there would be between these and which cam do you guys think will have the broadest torque curve? These are going along the lines of going with ported aluminum L98s w/larger valves (1.94/1.50 if I go with the higher-rpm cam or 1.84/1.50 with the 262). Sorry for the long thread but I believe this may be beneficial at some point...maybe a sticky to keep away from the recurring 305 buildup threads once I get everything together?

 

I ran .497/.517 and had a little to spare.