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Username Post: Fresh Gen 6 big block overheating        (Topic#356768)
eldee 
Senior Member
Posts: 325

Loc: Missouri
Reg: 03-18-00
06-10-19 02:01 PM - Post#2768150    

My buddy just installed this big block (professionally built?) into his '67 Chevelle. It is overheating, with the same fan, shroud and a new high flow water pump from his previous big block set up. The question here is: Using GM Bow Tie Performance heads on a Gen 6 big block, should the steam holes have been drilled into the heads? And would this contribute to the overheating if they were not?
Thanks for any and all help, Larry

Larry '55 BelAir Sport Coupe 355-TH400 7.41@ 93 MPH in the eighth.
1982 Chevy 3/4 ton restored Tow Vehicle for the '55
1977 L82 Corvette all original
1970 Volkswagon Beetle (in Mom's memory)


 


grumpyvette 
Senior Chevytalk Moderator -- Performance Subject Matter Expert --
Posts: 17348
grumpyvette
Age: 71
Loc: FLORIDA USA
Reg: 03-16-01
06-10-19 03:00 PM - Post#2768158    
    In response to eldee

they make BOTH clock wise and anti-clock wise rotation big block water pumps, Id sure check to be sure your using the correct version.
yes head gaskets do make a difference
https://www.felpro.com/technical/tecblogs/si ze-and...

http://garage.grumpysperformance.com/index.php?thr...

https://www.chevelles.com/forums/18-engine/2478 75-...

http://static.summitracing.com/global/images/chart...

http://garage.grumpysperformance.com/index.php?thr...





IF YOU CAN,T SMOKE THE TIRES AT WILL,FROM A 60 MPH ROLLING START YOUR ENGINE NEEDS MORE WORK!!"!
IF YOU CAN , YOU NEED BETTER TIRES AND YOUR SUSPENSION NEEDS MORE WORK!!


Edited by grumpyvette on 06-10-19 03:31 PM. Reason for edit: No reason given.

 
eldee 
Senior Member
Posts: 325

Loc: Missouri
Reg: 03-18-00
06-11-19 09:47 AM - Post#2768227    
    In response to grumpyvette

Thanks, Grumpy, all good info here.Not sure of the pump rotation, it was just purchased from Summit, I can reference the part number and determine the rotation.
Which direction does a Gen 6 need to turn to cool properly?
I hope this is not a mis-matched head gasket issue, only way to determine would be to remove a head and check!

Larry '55 BelAir Sport Coupe 355-TH400 7.41@ 93 MPH in the eighth.
1982 Chevy 3/4 ton restored Tow Vehicle for the '55
1977 L82 Corvette all original
1970 Volkswagon Beetle (in Mom's memory)


 
Rick_L 
Honored Member
Posts: 27634
Rick_L
Loc: Katy, Tx, USA
Reg: 07-06-00
06-11-19 05:34 PM - Post#2768257    
    In response to eldee

It's not a question of which direction does it turn, it's a question of whether the pump is designed to be used in the direction you are turning it.

For most old school accessory drives, the pump turns the same direction as the engine, clockwise when viewed from the front. For some serpentine accessory drives, the pump turns counter clockwise. The pumps for those two cases are different. With either, you want suction on the bottom hose, and pressure out where it bolts to the block.



 
eldee 
Senior Member
Posts: 325

Loc: Missouri
Reg: 03-18-00
06-12-19 02:25 PM - Post#2768334    
    In response to Rick_L

Ok, I understand. Kind of a dumb question after I thought about it for a bit! Yes, this is old school rotation, clockwise just like the motor, and the water pump out of the Summit catalog actually was for an old school 396, bolted right up to a Gen 6 big block.
I'm afraid my buddy has other problems contributing to this overheating, still trying to sort it out, thanks for the help!

Larry '55 BelAir Sport Coupe 355-TH400 7.41@ 93 MPH in the eighth.
1982 Chevy 3/4 ton restored Tow Vehicle for the '55
1977 L82 Corvette all original
1970 Volkswagon Beetle (in Mom's memory)


 
scrambldcj8 
Silver Supporting Member
Posts: 2478
scrambldcj8
Loc: Belchertown, MA
Reg: 04-06-03
06-14-19 06:09 PM - Post#2768481    
    In response to eldee

  • eldee Said:

I'm afraid my buddy has other problems contributing to this overheating, still trying to sort it out, thanks for the help!




Care to share those other issues? Is that buddy you? LOL

Seriously, it'll help others in the same boat.....



 


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