496 what size of heads?

Old 03-24-2011, 12:38 PM
Junior Member
Thread Starter
Join Date: Oct 2004
Posts: 19
Default 496 what size of heads?

We are buiding a 496. I've been told that you can put to big of heads on it. Right now I do have a set of 781's that we can clean up and smooth out but I do not want to put them on and then wish I would have gone with a better head for better performance. Bottom line is this. This engine will go on a dragster. I have very good components in the engine so it can handle some HP. What would I see in performance and HP gains with the stock heads and some aftermarket heads? With basic work on the stock heads can a person get 700HP? What kind of HP could I get with the bigger heads and how big would I want to go? Any advice is greatly appreciated. Of course it is easy to say to buy some wxpensive Rrodies but keep in mind a blue collar budget...thx M
rrrdad is offline  
Old 03-24-2011, 04:46 PM
Senior Member
Join Date: Dec 2005
Location: berea,ky
Posts: 184

The oval port heads are too small for max power on a 496.You need a square port head for that engine.If you are going to use aftermarket heads,something around 325cc's would be a good choice to use.345cc heads will probably be fine in a dragster but i would stay with the 325's.If you wanted CNC'd heads you could go with the 335cc's.
lanham is offline  
Old 03-24-2011, 05:29 PM
Senior Member
Join Date: May 2003
Location: Coldwater, MI
Posts: 2,998

In a dragster you can get away with a lot of head. Example I put dart 355 cnc'd on a 468 it ran 5.0s/8.0s @ 2000lbs, example 2 496 dart 360s 1950lbs 4.9s/7.8s
hammertime is offline  
Old 03-31-2011, 09:04 AM
Join Date: Dec 2007
Location: Grand Prairie, Texas
Posts: 36

What are your goals? You can make 700HP with a ported set of oval 781's with big valves on pump gas and a nice solid roller.

If your just looking for 700HP you dont need a huge head by any means... Im making 675HP on a pump gas hyd roller 496ci with AFR 305 CNC heads. If I were to drop an equivelant solid roller in I would be over 700HP per Tony Mamo of AFR. I drive my car everyday though and dont need or want a Solid.

Unless your running alot of compression stick with a 270-305cc head (depending on goals and use of engine).
Notalent is offline  
Old 03-31-2011, 02:04 PM
Senior Member
Join Date: Mar 2003
Location: Fountain,MICHIGAN
Posts: 856
Default 496

Well I have a 14.6.1 496 748/775 C/Cams Roller,made 870HP w/a 1150 Alcohol Carb,its getting a Enderle B&Ugly on a T/Ram as we Speak.This is on a Edelbrock Victor TR-2(MAYBE a Profiler)?
Anyway,It has a sey Of DART 355 CNC Heads,I was Told that It would be a TURD!
Well the #'s Speak LOUDLY.............!
G 8)
O'Ya,I'm Looking for 900-915 w/the Hat and poss.the Profiler?
bbchevy is offline  
Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Contact Us Archive Advertising Cookie Policy Privacy Statement Terms of Service