Curious: why cant HT502 be marine?
 

Shopping around for some torquey BBCs and came across a good price on a new GM HT502s. Searched the googles and they say they are "not for marine" us cases.

Why?

Forged internals, 8.75:1 compression, roller, 500-550ft lbs trq at 2500-4800. Seems like we could change freeze plugs, add closed cooling heat exchangers, and run em with EFI or carbs for a cruiser that will never see 5000 rpm. What am I missing?

You can absolutely use it for marine use but don't expect a warranty or support if anything we're to happen

There was a similar thread if you want to read up what the conclusion was: https://www.offshoreonly.com/forums/...plication.html

thanks for the link!

I don't blame you for asking! With the rebate they are advertising that is a very fair price

rebate??? I saw it on jegs. summit, and some random other site plus ebay. might be perfect for my tank of a vessel and I can always keep my Weiand 177s and bolt them on later LOL! Even at low rpm the 177s would add some torque..maybe get her to 625 ft lbs ;-0

I would go with the 502 HO over the HT. https://www.c6performance.net/catalo...-p-514384.html

Nice! Thanks Griff I here ya on the HO but this thing needs diesels and the truck motor seems the torquiest option....unless I am wrong - educate me.

Dont want to reuse my existing wiring harnesses so would need to find a set of those. Otherwise, would go new alts, water pumps, and starters, existing closed cooling, Gills with O2 sensor wedges, and fuel pumps and oil coolers. Could re-use blowers/carbs or go Sniper EFI and sell blowers/carbs. This could work for the old girl.

• Camshaft Lift (in.): .510 intake / .540 exhaust
• Camshaft Duration (@.050 in.): 211° intake / 230° exhaust

Any risk of water reversion with this CAM? (502HO) I have Gill manifolds and two complete sets of SS tubes - one set drops water 1 foot away from manifolds the other 4 feet.

Call and see if they have those HO’s. I thought those have been unavailable for a while now.

It has a 112 LSA, so you should be fine with Gils with long risers
https://www.summitracing.com/parts/n...0aAghCEALw_wcB