Building 496 from 454, cam advice
06-21-2009 | 01:46 AM
#11
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From: Darwin, Australia
I'M JUST SAYING IF YOU ARE GOING TO GO FASTER YOU NEED TO BUMP UP THE COMPRESSION TO 10:1 YOU WILL HAVE TO RUN 91 OCTANE ALL THE TIME BUT ITS WORTH IT CAM LIFT SHOULD BE IN THE 632 RANGE AND DURATION NO MORE THAN 252 OR 262 WITH A SINGLE PLANE DART WITH A 1050 DOMINATOR IF ITS IN THE BUDGET AND GET A BETTER IGNITION SUMMIT RACEING 1-800-230-3030 HAS A COMPLETE STRIP AND STREET UNIT WITH COIL BOX AND DISTRIBUTOR FOR $326.95 AND YOU SHOULD GET A LITTLE OVER 600HP. TEAGUE MARINE SELLS THE CAM ITS CALLED A STAGE 3HYDRULIC ROLLER 661-295-7000 TALK TO ERIC TELL HIM ERIC SENT CHA FROM 310 EXPRESSJust Kidding!
06-21-2009 | 12:53 PM
#13
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From: Ontario, OH
Engine is dying so mine as well pull the 454 and build it up. I'd love to get to 500hp. Already have 496 merc alum exhaust manifolds, 188 GM rect heads (which I believe are same as 502 500 hp heads correct?). Thinking of going to single plane intake, 60 over flat-tops, stroker crank, rods (all forged stuff of course)roller lifters, rockers, cam. Any cam suggestions?
06-21-2009 | 02:55 PM
#14
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From: Lake Conroe, TX.
06-21-2009 | 06:59 PM
#15
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From: Darwin, Australia
I did a search on here (it's my bible!) when I was looking for ignitions for mine. Of all the reviews I read, the MSD 6M had a common theme: They stopped working at an very inconvientient time / place. Several members on here have gone through multiple boxes, so far as I can tell, MSD tech support only ever tells people the box stopped working because of a 'poor ground.' I'd prefer not to get stuck so I didn't use the 6M. Crane no longer makes their HI6M so I went with what I thought would survive better.
It's just my opinion, as I've never had an MSD Marine Ignition before, but all the issues noted on this forum can't be wrong can they?
I'm not against MSD, I run an MSD HVC ign now, if it can survive NASCAR, it'll probably last for me! (I Hope!)
06-21-2009 | 09:06 PM
#16
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From: Lake Conroe, TX.
I did a search on here (it's my bible!) when I was looking for ignitions for mine. Of all the reviews I read, the MSD 6M had a common theme: They stopped working at an very inconvientient time / place. Several members on here have gone through multiple boxes, so far as I can tell, MSD tech support only ever tells people the box stopped working because of a 'poor ground.' I'd prefer not to get stuck so I didn't use the 6M. Crane no longer makes their HI6M so I went with what I thought would survive better.
It's just my opinion, as I've never had an MSD Marine Ignition before, but all the issues noted on this forum can't be wrong can they?
I'm not against MSD, I run an MSD HVC ign now, if it can survive NASCAR, it'll probably last for me! (I Hope!)
It's just my opinion, as I've never had an MSD Marine Ignition before, but all the issues noted on this forum can't be wrong can they?
I'm not against MSD, I run an MSD HVC ign now, if it can survive NASCAR, it'll probably last for me! (I Hope!)
I have some really old MSD boxes, have to have run for 5 or 6 years that I took off some engines. They were still working perfect when I took them off.
Really, the TBIV is a fine system and is still reliable. Rememebr that Merc used them over 500HP. Why can't we??
07-01-2009 | 06:27 PM
#18
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From: Lake Conroe, TX.
07-02-2009 | 08:05 AM
#19
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From: Knoxville, TN
http://www.msdignition.com/Products/...,_26_Kufd.aspx
26000 pico farad capacitor (26Kufd)
07-02-2009 | 12:14 PM
#20
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From: Austin, TX
Cam suggestions:
1) Bob Manderra (RMBuilder)
2) Crane doesn't make it anymore but if you can find a Crane '731' cam, buy it.
3) Crower makes nearly the exact same cam as the 731. It's part number 01404LM, Valve lift is IN .585/ EX .612. Duration at .050 is IN 236/ EX 245. Lobe separation is 110 degrees instead of the 731 which is 112 degrees LSA.
You'll need a better intake, stock ones are garbage. get an Edelbrock Performer RPM Air Gap or a Victor Jnr if you have to have a single plane, most Dart, World, Brodix and Merlin intakes will be just too much for the RPM you're looking at. If you already have the rect port heads don't worry, they'll still work but you'll deffinately need the best intake to control the flow.
I'd recommend a Holley 750DP Marine carb but be prepared to swap jets until you can get from 2000-4000rpm without coughing of spluttering if you hit it.
What ignition are you planning on running? Avoid MSD 6M in my opinion.
Good luck, let us know if you get stuck!
John
1) Bob Manderra (RMBuilder)
2) Crane doesn't make it anymore but if you can find a Crane '731' cam, buy it.
3) Crower makes nearly the exact same cam as the 731. It's part number 01404LM, Valve lift is IN .585/ EX .612. Duration at .050 is IN 236/ EX 245. Lobe separation is 110 degrees instead of the 731 which is 112 degrees LSA.
You'll need a better intake, stock ones are garbage. get an Edelbrock Performer RPM Air Gap or a Victor Jnr if you have to have a single plane, most Dart, World, Brodix and Merlin intakes will be just too much for the RPM you're looking at. If you already have the rect port heads don't worry, they'll still work but you'll deffinately need the best intake to control the flow.
I'd recommend a Holley 750DP Marine carb but be prepared to swap jets until you can get from 2000-4000rpm without coughing of spluttering if you hit it.
What ignition are you planning on running? Avoid MSD 6M in my opinion.
Good luck, let us know if you get stuck!
John
