98 Heads

[n.m.racer]

I know the 98 heads do not have the center bolts through heads. My question is what are those heads casting numbers? Also was 98 the only year they were put on f-bodys? I have a 99 and I'm praying I dont have those heads.

I forget my casting number 85-... and I think those are it. If I do have those heads, Is my block not capable of matching a set of 243's or something else from the later engines? Or is it posible to drill and tap the block where the head bolts go? Or are the designs for the bolts completely different?

[c5z28]

97-98 heads are 806
99-00 853
01-04 241

[mark21742]

the head bolt patterns are the same, so you can bolt a newer set of heads right onto the block.
if you do a swap you'll need the newer centerbolt valve covers and coil bracket

[n.m.racer]

the head bolt patterns are the same, so you can bolt a newer set of heads right onto the block.
if you do a swap you'll need the newer centerbolt valve covers and coil bracket

Can you tap into the block for the center head bolts?

[garygnu65]

you do not need to tap into the heads for center bolt valve covers!

[n.m.racer]

you do not need to tap into the heads for center bolt valve covers!

haha not the valve covers but the heads themselves into the block

[346ci]

97-98 heads are 806
99-00 853
01-04 241

That's good info, thanks

[c5z28]

Some of the 01 + came with 243's. Guy at the shop I visit has an 02 with 243 heads.

You mean to tell me some 01-02 f-bodies recieved 243 heads
time to bring the gang on in.

[c5z28]

haha not the valve covers but the heads themselves into the block

the only difference is the center bolt valve covers the head bolts are the same pattern-tapping into an aluminum block

[JoshieDoom]

Heads swap from the 98 heads requires new valve covers and coil pack brackets.

They are direct fit.

243 heads didnt come on 02s. I do believe the pushrod length is different on them.

[chuckie669]

I apologize for the misinformation. If your not supposed to trust everything you read on the internet and can't trust people you talk to? Who the F can you trust?

[Too Fast]

97-98 heads are 806
99-00 853
01-04 241

My 5/00 WS6 has the 241 heads. They must've changed late in the production year.

[9T8W66]

Heads swap from the 98 heads requires new valve covers and coil pack brackets.

They are direct fit.

243 heads didnt come on 02s. I do believe the pushrod length is different on them.

Correct
As for the pushrod length it is based off the Base circle of the cam and has nothing to fo with the heads (unless they were milled).

[c5z28]

My 5/00 WS6 has the 241 heads. They must've changed late in the production year.

very late 00 recieved 241