Use big cam and big heads or procharger
05-18-2010, 07:42 PM
#1
Registered
Thread Starter
Join Date: May 2010
Location: Cincinnati Ohio
Posts: 11
Likes: 0
Received 0 Likes
on
0 Posts
Use big cam and big heads or procharger
Been trying to figure out on my bbc427 bored .60 over, would i be better to run a big cam and nice big 345cc matching heads, or go smaller cam / heads and just add procharger. I like big lope and want river poker run boat, so what would be best on gas usage also? currently have bravo x drive. Any and all ideas welcome! block is sitting waiting for decisions!
05-18-2010, 08:05 PM
#2
Registered
iTrader: (7)
Stay conservative and add the procharger. Personally I wouldn't run 345 cc intake runners on much less than 565 unless Your planning on camming it for 4,000 to 7,500 RPM. Not a real advisiable marine engine for your application.
05-22-2010, 10:16 AM
#6
Registered
Platinum MemberJoin Date: Mar 2008
Location: Vancouver BC
Posts: 1,181
Likes: 0
Received 0 Likes
on
0 Posts
If your short block is set up to handle some boost use a supercharger. There is no better bang for your buck. 345 heads and a big cam will not be great on a 427" engine. It will move your power band way to high and you'll need some good exhaust to avoid reversion. Any blower/SC is very tolerant of poor flowing heads and exhaust and will still make excellent power. Good luck 
05-22-2010, 04:48 PM
#8
05-22-2010, 04:58 PM
#9
Registered
Get some good large oval heads with big valves and a Cam & Valetrain from RMbuilder. You could also stroke that engine and get some more CI.
Anyone know what the bore and stroke is on a 427?
Anyone know what the bore and stroke is on a 427?
Last edited by jeffswav; 05-22-2010 at 05:01 PM.
05-22-2010, 06:04 PM
#10
4.25 x 3.76, 427 doesn't have much torque for a boat. Even a 4 inch crank would help. The Procharger would add power accross the RPM range.
Last edited by GPM; 05-22-2010 at 06:07 PM.
