REDS32

Sell your motors and find two good motors all ready built. Trying to rebuild yours will disappointing and to expensive. There's alot of good motors around cheaper than building yours . I've tried rebuilding the 330 for HP and it's more trouble than it's worth.

wjb21ndtown

Jeff, what do you think about adding large ovals, a matching edlebrock performer intake, and a set of roller rockers to a 330hp motor? That's what I was thinking about doing in the next month or so. The 049 and 781 heads have a 5cc smaller combustion chambers. That 5ccs + adding a 0.027 head gasket will raise the compression from 8.0 to 8.4ish.

It seems like an easy way to squeak 30-40 hp out of these motors without really doing anything that would hurt them, and I will get to freshen up some tired parts as well (head gaskets, springs, valve seals, etc.).

Budman II

iTrader: (1)

I'm pretty sure both the 049 and the 781 castings have at least 119 cc chambers, so you will definitely not increase compression by switching to them. I had a set of 781's cc's by my machinist, and they came in at around 124 cc. The 049's are large chamber as well. You might look for a set of the mid-70's 820 castings - they come in around 112 cc. Another option would be the late model Vortec's, which I think are around 109 cc, but they have the swirl intake ports that can limit flow.

Budman II

iTrader: (1)

Endeavor, I would definitely try to sell your complete engines. If they only have 195 hours on them, you should have no problem finding a buyer. Put that money into a pair of 502 short blocks, and you will be ahead of the game.

wjb21ndtown

I don't know why everyone says 781s have such large cc chambers. If you look up the casting # on the Motech website it lists them at either 115 or 113. That's what I've found on every set I've ever ccd. I have four sets of 049s right now that all measure either 113 or 115.

I can't stand vortec heads. They have decent sized runners and small combustion chambers, but other than that, IMO they're junk if you want to have any sort of performance other than a stock 300hp ish towing motor.

jeffswav

Look on the Mortec website for the specs. I used the 820's with 113cc stock then milled down to 110cc. That would get you a little more compresion. Without the cam you will see very little gain. If you do a cam you will need exhaust. To get any real power you need to bore and stroke it with forged internals. You see were I am going with this, learn from my mistakes and leave it alone till you can do it right. If you really what to do somthing bolt on some aftermarket exhaust and roller rockers. That will get you about 2MPH. That way on your next project you can do a cam and head upgrade. http://classic-web.archive.org/web/2...ec.com/bbc.htm

jeffswav

781's are larger look at the link I just posted 049's are even bigger

endeavour32

iTrader: (4)

I'm going to leave the engines I have alone and look for at pair of 502's or 454/420's. I know what I had into my engine in my 242 and it was close to $10,000. X2 thats $20,000, I'm not spending that again when some nice take outs will get me to my speed goal of around 70 mph.

REDS32

Your on the right track.

jeffswav

I see you have 2 boats, that makes sence now.