Since you are from Illinois I would recommend calling Bill from Ateco. They are in Northern Illinois. Bill is a super nice guy and very knowledgable, not just going to try and sell you something. I put together my engines and had them dyno them. Bill had given me some suggestions on making more HP and also helped me out with some other problems I was having with temperature. Worth a phone call in my opinion.

Intercooled prochargers will make more power..

A 500HP carb motor really is not worth much today. Keep what you have, and improve them. Buying used performance engines is risky if you don't really know what is inside them.

Add some polished blowers, the right cam, serp belt system, nice headers, paint the blocks pretty, and have the valve and intake covers custom painted or wrapped to match the boat. IMO that set up with your drives in a Cig is worth way more than those 500hp carbs.

Adding alum heads or a chiller (or both) will make your engines more reliable at the cruise speed you desire.

http://www.whipplesuperchargers.com/...sp?ProdID=1159

12-13k bolt on and go for a pair. staying well in your budget

cant beat them

im pretty much sold on the TBS setup if the compression wont be an issue.$4300 a side complete less carbs and upgrade to a 525 spec cam.Which 525 though? efi or sc? And i talked to ateco at pier 57's open house this spring but i wasnt looking for more at that time. Seem like good people though.

if your going through the trouble of changing the cam call bob madara at marine kinetics and have him custom grind you a couple. 525 cams arent blower cams

Wouldnt the cam specs for a 525sc be a blower cam? i agree tho that a custom one based on specific setup would be best. but i dont know the cost difference between the two.

my bad.. i meant a 525efi cam isnt a blower cam. a 525sc is a 454... needs more cam for more cubic inch. the little more money for a custom grind for his application and the performance gains vs a off the shelf cam will be well worth the money... whats another 2-300 bucks when your spending 10k

Very good point.Whole reason i'm waiting til next winter is the motors will be out again for rebuilds.400hrs on them now, should be around 550 by next winter so cams are a no brainer with them being apart already.

Is 15-20k for the rebuilds and blowers, for both motors?