I'm trying to do an old school heater hose system but I've run into a few problems.
First, the heater core has 2 different size pipes! Which goes to the waterpump and which goes to the intake manifold?
Also, what size hose are you running since they are different size. I was going to run a smaller size but I don't know. Is it okay to run two different size hose? Please help before it gets too cold .

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, Jon (350 TBI!)
91 Red My website

Hey Jon, I can take some pix when I get home tonight to show you how I rigged my bypass. I'm fairly sure that I used 5/8" and 3/4" but I'll double check when I get home...

S.

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Steve's Trans Am Temple

Correct. 5/8" from the intake manifold, 3/4" to the water pump.

Or, to put it another way, 5/8" for the hot supply, 3/4" for the return.

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82 Berlinetta, orig V-6 car, now w/86 LG4/TH700R4. 2.93 limited slip. 2-1/2" cat-back, ZZ3 intake, Accel HEI SuperCoil. AMSOIL syn lubes bumper-to-bumper. Daily driver, work-in-progress (LG4 CC system w/'87 LB9 block, ZZ3 cam, ported World 305 heads, Hooker 2055 headers, 3" Catco cat & 3" catback, restalled TC, Spohn SFCs).
57 Bel Air, my 1st car. '66 396, 9.7 CR forged TRWs, Weiand Action+, Holley 750VS w/4150 conversion, GK 270 cam, Magnum rockers, Jacobs Omnipack, 1-3/4" Hedders & 3" Warlocks, TH400 w/TCI Sat Night Special conv & Trans-Scat shift kit, MegaShifter, 3.08 8.2" 10-bolt w/Powertrax, AMSOIL syn lubes bumper-to-bumper. Idles smooth @ 600 RPM in D. Best 15.02/95.06 @ 5800' Bandimere (corrected 13.93/102.4 @ sea level).

COOL. I've seen some pictures and they show 3/4 for both. What could be some problems with running them with 5/8" for both?

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, Jon (350 TBI!)
91 Red My website

Getting them on a 3/4" pipe.