When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
FWIW
I've been watching this thread for a good while, and with the seller's permission, I'd like to help out by answering a few of the questions I see here.
I've put headers on two C4's and in both cases the headers were able to be used on either L98 OR LT1. As I don't have access to these headers I can't say with absolution that they'll fit an L98, I'd be very confident they will.
Will they offer a performance increase?
SLP is a respected name in performance. Also the L98 factory manifolds don't fully uncover th exhaust ports on the aluminum head cars I've worked on. Also, the factory manifolds on them are sized somewhere around 1-1/2" primary. They seem to neck down to about 1-1/4" in some spots. I don't know of any specific Dyno results for proof, but when you add up the facts I've presented, I'd feel very comfortable saying Yes, they will help performance.
If you're worried about mating them to your front Y, any competent exhaust shop should be able to knock that chore out in well under an hour, if needed.
There you have it. Someone quit with the pussyfooting and buy these well priced headers.
If I hadn't already bought and fought with the fit of my Exotic Muscle, "product," believe me, I'd have given these a great deal of consideration for my 383 project.
For those who want to know, LT-1 manifolds/headers DO fit L-98's They bolt right up to the head, flow MUCH better, and also bolt right up to the stock y-pipe. I did this on my 91 back in 2013. I did make a set of custom l-shaped tubes to keep the factory air injection.
I originally installed a set of cast iron LT-1 manifolds, then later found a set of Hooker LT-1 headers. I removed the EGR pipe from the factory headers and added it into the Hooker headers, then had them ceramic coated - see the last picture. When it came to smog time the smog guy asked and I just told him they were the factory headers that I removed the heat shields from and had them coated. That was good enough for him and that was in Kalifornia.
Bottom line is, with a little work these are a significant improvement in flow capability over the stock headers for any TPI car. $500 is a DEAL.
01-16-2018, 03:46 PM
