Jan 8, 2008 · The L98 was an adequate engine back in the late 80s when it was produced. It could hang with the best of the day. However, welcome to the 21st century where an L98 …

May 9, 2005 · Put simply, the L98 suffers from relatively poor airflow in and out of the engine and so the best mods are those that address these issues. However by making any changes you …

Mar 10, 2002 · Re: How to L98 Engine rebuild (Mark84_L383) I didn't make myself clear, don't get a PAW block, although cheap, they are pretty much the same block you've already got, only …

Mar 7, 2007 · C4 Tech/Performance - L98 Crate Engine - I've been looking for a replacement engine for my 85 L98 for awhile now and GM has disco'd the part. However, I did find a short …

May 29, 2008 · C4 Tech/Performance - L98 engine rebuild considerations - I've got a 89 coupe with 76K miles, overall it still runs good but has a couple small issues. I've got a small coolant …

Jan 15, 2012 · C4 General Discussion - L98 engine rebuild - I have a 1991 vert with the L98 engine pushing 150K miles. Car is in perfect shape outside and good interior so I'm looking at …

Apr 18, 2004 · Doug Rippie Motorsports (DRM) used to offer at one point an engine conversion for the L98. For a 350cid L98 based engine, they claimed 340bhp/425ftlbs; for a 383cid L98 …

Oct 1, 2009 · A L98 is a 350 SBC with TPI. You won't make 500Hp with a TPI so once TPI comes off it is just another SBC. 500Hp is doable from a 350 but won't be a "street" engine .That is …

Jul 12, 2009 · The L98 is such a cool looking engine! Too bad you have to go away from runners to get the HP numbers up with even the base C5. I've been toying with uping my C4 HP as …

Jan 23, 2009 · The weakest link in the L98 is the intake manifold. They respond like a smallblock Chevy to mods otherwise. Here's what I've done, Superram intake manifold and 58mm TB, …