L98 alum heads????????
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Supreme Member
Joined: Dec 2005
Posts: 1,244
Likes: 1
From: Texas City, Texas Area
Car: 89 RS, 92 Z28
Engine: 305 TBI, 350 TPI
Transmission: 700R4 Both Cars
Axle/Gears: 3.23 Posi.. 4 wheel disc both cars
L98 alum heads????????
Can someone please tell me what vehicles had L98 alum heads??? Also, stock, what is the CC of the head???? Also, are these good for a stock 305 TBI???????Pro's, Con's??? I searched but didnt really find much on this.. Thanks for any answers on this subject....Tom
Thread Starter
Supreme Member
Joined: Dec 2005
Posts: 1,244
Likes: 1
From: Texas City, Texas Area
Car: 89 RS, 92 Z28
Engine: 305 TBI, 350 TPI
Transmission: 700R4 Both Cars
Axle/Gears: 3.23 Posi.. 4 wheel disc both cars
Ok, thanks for the info..I had heard they were pretty good...Im not sure about the bigger valves on a 305, arent there issues with clearance???????
Joined: Mar 2000
Posts: 43,187
Likes: 42
From: Littleton, CO USA
Car: 82 Berlinetta/57 Bel Air
Engine: L92/LQ4 (both w/4" stroke)
Transmission: 4L80E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
No problem with clearance. The distance from the edge of the valve to the cylinder wall is a lot less than it is with a 4" bore, so flow will be reduced in that area.
ZZ3 & 4 crate motors came with the aluminum heads as well. Not sure about ZZ2 off the top of my head.
They'll be much better than TBI heads. Porting required to get them to flow more than LB9 heads with 1.94" intake valves installed.
You should shave the chambers to about 52cc if you put them on a 305. Assuming no 350 shortblock is in your future.
ZZ3 & 4 crate motors came with the aluminum heads as well. Not sure about ZZ2 off the top of my head.
They'll be much better than TBI heads. Porting required to get them to flow more than LB9 heads with 1.94" intake valves installed.
You should shave the chambers to about 52cc if you put them on a 305. Assuming no 350 shortblock is in your future.
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