98 block questions
98 block questions just wondering if you guys can tell me what is so junk about the 98 aluminum 5,7 block so I can try to correct it.
I plan to autocross, road race and some drag.
What heads can I use? I heard that there are different heads on the 98. I was thinking of something different than the 853
What failures have you seen?
thanks!!
I plan to autocross, road race and some drag.
What heads can I use? I heard that there are different heads on the 98. I was thinking of something different than the 853
What failures have you seen?
thanks!!
Only difference I know of is in the lifter bore oil feeds area on the back of the block behind the rear cover, the 98 has some holes and a passage and the later blocks have that area opened up. I dont see this as junk, it works just fine, they made the change but the system still has perfect function. The only complaint I have really heard on the oiling of road race cars is that they sometimes suck the pan dry during hard turns, and thats usually due to a high volume oil pump and the stock pan setup. As far as heads go the 98 has the perimeter bolt valve cover heads,,all the performance heads are of the centerbolt valve cover style,,not a problem when you buy heads you just need to pick up a set of centerbolt valve covers and some coil brackets. hope this helps
Staging Lane
Joined: Apr 2010
Posts: 56
Likes: 0
From: Joliet, Il
You will also want to upgrade your rod bolts. I have a '98 and that is one thing that I was told was a weak point for the '98 bottom end. I too am going for an autocross setup w/ ~500rwhp. They changed the '99+ to a different designs, but for $200 you can get the Katech rod bolts and fix the issue.
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to my knowledge...the 03+ ls6 blocks are the only blocks with the rear oil cross over passage.
Otherwise...just the block alone the only difference between a 98 block and a 99+ is the thickness of the cylinder sleeves. The 98's are thinner. 99+ are slightly thicker and can handle more of a hone.
Otherwise...just the block alone the only difference between a 98 block and a 99+ is the thickness of the cylinder sleeves. The 98's are thinner. 99+ are slightly thicker and can handle more of a hone.
