Will they work with a mild-cammed and headered 305, or should I port them...

Or are they that bad that I should invest in new heads. If so, what ones should I invest in with 1.5inch primary headers and the Comp Cams 260 cam. Stock intake and CC Rochester carb.

Someone mentioned World Torquers... Is there anything cheaper that will get the job done? Will a split pattern cam like the XE series cams help compinsate for the LG4 heads? Or are they still going to be a bottleneck?

PS this is a 5-speed car, with a 3.42 rear.

Can anyone run this combo on DD2000 and give me figures?

 

F-BIRD'88 had good success with porting his 416's I believe.

Vortecs are a little cheaper to buy, but then you have to buy the required intake that will put them at the same price as the World's.

 

Also, with the stock heads, will I need screw-in studs for the 260 cam, or the split pattern XE262?

---

Springs, retainers, locks, seals and, a timing set are a given...

 

I take it that 416's are the stock heads in that year LG4?

 

Yeah sorry, shoulda mentioned that. How much lift does that cam have? I dont think you will need screw in studs. The stock 'lift out' (Vader) studs should work fine.

 

Forget it, I'm going with the HE260. the dual pattern is going to cause too much torque loss, the 5speed will let me control things...

the 87 305 is a roller block isn't it?

****, that means I need to find a hydraulic roller camshaft...

****.

 

416's weren't the stock heads in 1987. '86-earlier, yes.

Why are you asking about '87 LG4's? Do you have one you're building? '87 will be roller block, one-piece rear main, center bolt valve covers, center two intake bolts on each side at a different angle from the others.

 

Oh whoops, I missed the 87 part hehe. Yes roller block means you should get yourself a roller camshaft for the 87-95 SBC's. You could run a flat tappet cam, but you'll need different length pushrods.

yeah the 87 LG4 is an entirely different animal

 

I might be swapping an 87 LG4/T5 set-up into the Sport Coupe... (rather, having it swapped... however you wanna look at it... 1991tealRSt-top is going to be the leader, I'm going to help out as much as I can...)

The minds of the heads I scratched as well as my own are a little foggy, but I believe it's an 87 car.

I'm just trying to plan this whole thing out in my head as I go... collecting parts and what not...

And before you jump on me about the swap-in-a-350 BS... when you can get a running/driving/in-the-car setup for no more than $200, you jump on the opportunity, especially when you have a dying V6 and 700R4 setup in your car now...

 

A good different animal, or a bad different animal...

What are it's weak points... cam, heads? Intake, carb?

Are the heads on it going to be good enough for a mild cam and headers? Or do they need to be ported, should I slap ported 416's on it instead? Should I port the stock 87 lG4 heads?

 

LG4s are excellent--once you dump the exhaust, heads, intake and cam

Port and polish your own heads! We have a lot of folks right in the middle of it right now, so look at the other threads dealing with this and join right in. F-Bird'88 is tutoring the lot of us on this, so take advantage of his expert help.

We've discussed all of these points. You arrived at the perfect time

 

xenodragon............if you can wait a month or two, i can sell you my LG4 heads...............jeff had them ported pretty well..........i just need to put the heads i am buying today on...................

 

btw, how much can i ask for a set of stock LG4 heads that need to be rebuilt (these arent the ones i will sell you, xeno, dont worry)

 

.....and a friend who is going to do the swap for free......

 

They'll need to be ported, the '081' castings are very similar to the '416' castings. However if it was up to me, I would go with the '416' castings just because of their compatibility with more aftermarket intakes. The centerbolt design seals better around the cover, but the fact that the 87-95 intake design requires more expensive and less popular intakes is kinda a downside.

 

The cost of shipping.

At least, that's what I'm offering for the set of 416's I've got.

Oh, the '87-later "good" 305 heads are the 081 casting. I have one of those with one cylinder already ported...

 

Taking up room in the garage, eh Tim?

 

This can easily be over comed by slotting the holes.

 

Or by getting the centerbolt conversion kit from GMPP to make the perimeter heads into centerbolt. Either way it can be done.