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Username Post: Is it ok to block off both heater hose fittings on the block?        (Topic#355734)
1941srodcoupe 
Member
Posts: 70

Reg: 07-08-03
03-24-19 08:33 AM - Post#2762760    

On a 1969 stock small block is it OK to block off both heater fittings on the block? I'm talking about the ones on the intake and water pump. Or does the circuit (so to speak) need to be completed for proper cooling reasons? Thanks



 


grumpyvette 
Senior Chevytalk Moderator -- Performance Subject Matter Expert --
Posts: 17384
grumpyvette
Age: 71
Loc: FLORIDA USA
Reg: 03-16-01
03-24-19 08:51 AM - Post#2762763    
    In response to 1941srodcoupe

thousands of engines have the ports blocked or connected with a short hose to bye-pass the heater core, without a problem



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 03-24-19 08:52 AM. Reason for edit: No reason given.

 
acardon 
Ultra Senior Member
Posts: 11272
acardon
Loc: DFW TEXAS
Reg: 03-25-05
03-24-19 07:40 PM - Post#2762801    
    In response to 1941srodcoupe

The heater was optional on 1955 up Chevys with small blocks and both holes had a plug, if they didn't have a heater.

Don
66 Corvair (driving)
57 2dr HT (driving)
56 2dr HT (waiting to be restored)


 
busterrm 
Frequent Contributor
Posts: 1230
busterrm
Loc: Wichita Falls, Tx
Reg: 08-31-10
03-24-19 08:38 PM - Post#2762804    
    In response to acardon

In the desert regions most cars have the heater bypassed with hose bought at any parts store. The two outlets are usually different size hose, so let the assistant at the parts store know if your vehicle is that way so the bypass hose fits correctly. You might consider a bypass for the heater core also.

==== BOB ====
If I can't smoke the tires I want more!

1976 Chevy Nova
2007 Chevy 1500 1/2 ton
2017 Harley Davidson XL1200 Sportster
2018 Nissan Versa Note


 
454cid 
Valued Contributor
Posts: 3113

Age: 46
Loc: West Michigan
Reg: 02-18-12
03-24-19 08:59 PM - Post#2762805    
    In response to busterrm

  • busterrm Said:
In the desert regions most cars have the heater bypassed with hose bought at any parts store. The two outlets are usually different size hose, so let the assistant at the parts store know if your vehicle is that way so the bypass hose fits correctly. You might consider a bypass for the heater core also.



I had a heater core blow out of town once, and I stopped by a NAPA and bought a fitting that had was 3/4" on one end and 5/8"th's on the other. I still have it tucked away in case I need it... Although, I can't tell you exactly where it is.

I think there are a few small blocks that don't have the internal bypass... 60/70's Corvettes, I think? I looked into it at one time, and it seem like it was a Corvette board where they were having issues not running a heater core. Also the late Vortec SBC has an external bypass (like a BBC) instead of the earlier internal to the pump bypass. You really neeb a bypass of some kind, and the heater circuit will function like that if there's nothing else.




99 K3500 RCLB


 
1941srodcoupe 
Member
Posts: 70

Reg: 07-08-03
03-25-19 06:00 AM - Post#2762821    
    In response to 454cid

Thanks for the info folks.




 
Rick_L 
Honored Member
Posts: 27645
Rick_L
Loc: Katy, Tx, USA
Reg: 07-06-00
03-25-19 04:19 PM - Post#2762878    
    In response to 454cid

  • Quote:
You really neeb a bypass of some kind, and the heater circuit will function like that if there's nothing else.



Many Chevys have a heater shutoff valve as part of the heater setup. Vintage Air setups do too. Heater circuit coolant flow is deadheaded if the valve is closed.

All traditional small blocks except the 96-up Vortec have an internal bypass.

Plugging the ports at the manifold and water pump is just fine, no need for a loop.



 
Algoma56 
Contributor
Posts: 713

Loc: Sault Ste. Marie, ON, Can...
Reg: 03-14-05
03-26-19 06:59 AM - Post#2762932    
    In response to Rick_L

Would same apply for the big blocks? They have a bypass hose at the water pump, so the heater fittings can be plugged?



 
Rick_L 
Honored Member
Posts: 27645
Rick_L
Loc: Katy, Tx, USA
Reg: 07-06-00
03-29-19 09:20 AM - Post#2763162    
    In response to Algoma56

Yes.



 
Algoma56 
Contributor
Posts: 713

Loc: Sault Ste. Marie, ON, Can...
Reg: 03-14-05
03-29-19 05:39 PM - Post#2763218    
    In response to Rick_L

Thanks. I figured so, just needed confirmation.



 


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