C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Rear Coolant Crossover

Thread Tools
 
Search this Thread
 
Old Jun 11, 2024 | 11:11 AM
  #1  
TPIGroove's Avatar
TPIGroove
Thread Starter
Advanced
 
Joined: Apr 2017
Posts: 90
Likes: 14
From: St Louis
Default Rear Coolant Crossover

Seems like there's a fair bit of debate on this. Currently putting an Accel base on my engine, and I didn't know about the weird block off plate on the intake gasket before I bought it. From what I understand I should be fine if I delete the T connection to the heater core hose and properly burp the system.

I have aftermarket aluminum heads on here, and I imagine the engine will make more heat because of the cam, too. Mild 355 with 219/225 and superram, long tubes, EGR delete, ect. I also plan on getting a higher flowing water pump since this car will be in a warm climate (Florida). I'd still like opinions on this before I put the intake on, though.
Reply
Old Jun 13, 2024 | 05:57 PM
  #2  
Joe C's Avatar
Joe C
Race Director
25 Year Member
Liked
Loved
Top Answer: 1
 
Joined: Aug 2000
Posts: 11,470
Likes: 763
Default

Originally Posted by TPIGroove
Seems like there's a fair bit of debate on this. Currently putting an Accel base on my engine, and I didn't know about the weird block off plate on the intake gasket before I bought it. From what I understand I should be fine if I delete the T connection to the heater core hose and properly burp the system.

I have aftermarket aluminum heads on here, and I imagine the engine will make more heat because of the cam, too. Mild 355 with 219/225 and superram, long tubes, EGR delete, ect. I also plan on getting a higher flowing water pump since this car will be in a warm climate (Florida). I'd still like opinions on this before I put the intake on, though.
i remember the rear manifold cross-over thing. on my 90 corvette, i had to pull the intake because of a china-wall leak and as i recall, i left the rear crossover passage wide open and retained the "tee" connection. no problems or issues. GM engineers wanted to slow the flow for some reason - probably for some sort of emissions thing. as i remember it was about a 50-50 here on the forum whether to restrict the flow or not. heat wise and performance, i'm thinking it didn't matter one way or another. as for the water pump, installed a premium Flowkooler in my 85 - 8-years now, again, no issues or problems.
Reply
Old Jun 14, 2024 | 01:22 PM
  #3  
TPIGroove's Avatar
TPIGroove
Thread Starter
Advanced
 
Joined: Apr 2017
Posts: 90
Likes: 14
From: St Louis
Default

I'm just gonna go ahead and leave it open then. I think the high flow pump and a reprogrammed fan temp should keep the engine plenty cool.
Reply
Old Jun 14, 2024 | 01:55 PM
  #4  
Joe C's Avatar
Joe C
Race Director
25 Year Member
Liked
Loved
Top Answer: 1
 
Joined: Aug 2000
Posts: 11,470
Likes: 763
Default

Reply

Get notified of new replies

To Rear Coolant Crossover





All times are GMT -4. The time now is 10:03 AM.

story-0
Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!

Slideshow: the top 10 things Corvette owners want in the C9 Corvette

By Michael S. Palmer | 2026-04-30 12:41:15


VIEW MORE
story-1
10 Revolutionary 'Corvette Firsts' Most People Don't Know

Slideshow: 10 Important Corvette 'firsts' that every fan should know.

By Joe Kucinski | 2026-04-29 17:02:16


VIEW MORE
story-2
5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2

Slideshow: Should you buy a 2020-2026 Corvette or wait for 2027?

By Michael S. Palmer | 2026-04-22 10:08:58


VIEW MORE
story-3
2027 Corvette vs The World: Every C8 vs Its Closest Competitor

Slideshow: 2027 Corvette lineup vs the world.

By Joe Kucinski | 2026-04-24 16:12:42


VIEW MORE
story-4
10 Most Common Corvette Problems of the Last 20 Years!

Slideshow: 10 major Corvette problems from the last 20 years.

By Joe Kucinski | 2026-04-14 16:37:05


VIEW MORE
story-5
5 MOST and 5 LEAST Popular Corvette Model Years in History!

Slideshow: 5 most and least popular Corvette model years.

By Joe Kucinski | 2026-04-08 13:25:01


VIEW MORE
story-6
2027 Corvette Buyer's Guide: Everything You Need to Know!

Slideshow: 2027 Corvette buyer's guide

By Joe Kucinski | 2026-04-17 16:41:08


VIEW MORE
story-7
10 Things C8 Corvette Owners Hate (But Won't Tell You)

Slideshow: 10 things C8 Corvette owners hate, but won't tell you.

By Joe Kucinski | 2026-04-01 18:36:07


VIEW MORE
story-8
10 Best Corvettes Coming to Barrett-Jackson Palm Beach 2026!

Slideshow: Should you add one of these incredible Corvettes to your garage?

By Brett Foote | 2026-04-01 18:14:05


VIEW MORE
story-9
Every Corvette Grand Sport Explained! (C2, C4, C6, C7, & C8)

Slideshow: Every Corvette Grand Sport explained

By Joe Kucinski | 2026-03-26 07:13:44


VIEW MORE