water crossovers in mainifolds

[timewarped1972]

on alot of after market manifolds for older carbd 302's, the intake manifolds don't have a rear water cross-over. there is debate as to if this is good or bad for cooling circulation. regardless, it does seem to cause more gunk build-up in the rear cooling passages of the head because the water just sits and doesn't circulate........just my opinion......but regardless.....do the efi and after market efi manifolds have rear water cross overs in them?????

 

[Blk91stang]

Yes the rear passages of the 5.0 EFI intakes goes to the heater core and 1 comes with a plug so it does recirculate the back passages. Funny you should mention this about old cars not having this. My dad is building a 555ci chevy motor and asked the same question why most BBC aftermarket intake manifolds (Brodix intakes have the rear passages) dont tap the back passages in case someone wanted the extra cooling. My dad took his Edelbrock intake to a machine shop and had it tapped so he could recirculate the water and hopefully make it cool better. I would have to say that YES!! this does help in cooling instead of having the water lay back there and heat up. I don't see a reason why it would make a car run hotter???

 

[timewarped1972]

another thing that happens is if you have a manifold with no rear cross over you need to put silicone on the manifold or the water over time will almost eat it's own cross over..lol.....
i see your installing power heads and a typhoon manifold....who and or what are the pwer head, like whats the valve specs on them and what do they run a pair? are those iron or aluminum? seems like i saw an add for them but i have so much 5.0 crap in my head right now i can't keep it all straight........please post back on how that manifold works and with those heads. from what i gather that manifold is an edlebrock knock off, but is it a knock off of the performer or a performer rpm??? do they give you a carb emissions legal sticker or number with that manifold??
i have been looking at those, i bought a victor jr knock off from that company for my 65 stang and near as i can tell the only real difference between their stuff and everyone elses is it;s made over sea's.......which i suppose would sway some to keep it as american as possible.......but a budget is a budget when building a car, atleast for a manifold anyway....

 

[dcrahn]

The rear crossover make no difference and is not needed. We changed from EFI to carb using the Victor Jr. and it made no difference in the temperature. The water doesn't just sit in the back, it flows from the back to the front.

 

[Blk91stang]

Power Heads are a comany that takes the stock cast iron E7 Mustang heads and ports them, new valve guides and valves and all that other caca for 600-700$. You can check them out at www.powerheads.com. They work REAL GOOD on my 351w motor!! I'm not sure if the Typhoon intake is a copy of the RPM or not.. It was cheap so I got it!! I don't remember seeing if it's a emissions legal intake or not so I couldn't tell you that. I should have my setup together in the next month hopefully since I finally got my meter, injectors, a/f reg., smog delete, powerpipe... the list never ends.. I'll be sure to post my results!!