What cam for 454 mag?
 

Putting my old motor back in boat to sell freshining it up first before install need cam similar to orig carburated 1995 gen v magnum 365hp or mild upgrade that wont revert with stock exh manifolds.Any suggestions would be helpful.Thanks

you might want to call bob madera[rm builder]he has a ton of knowledge about cam selection.

This would be very close to the stock Gen V flat tappet cam. Very slight bit more lift.
http://www.summitracing.com/parts/cc...make/chevrolet

Stock cam specs are
224/224 @.050"
510/510 lift
115.5 LSA

Don't do any more cam with stock exhaust. Asking for reversion

My buddy ran a 236/245 114lsa flat tappet for many years in upgraded 454 mags, and stock iron center rise manifolds. No reversion. I wouldn't have believed it, but it worked.

A good hyd roller grind, some roller rockers, will wake the engine up big time. Stock cam is very mild.

comp cams xm262h works great with stock springs and manifolds..

Good choice to use a stock replacement and will not have reversion issues.

Two,
The Merc 431-9830 cam is still available through GM dealers as GM part #14096209. GM rates this cam as 220º/220º @.050 .500/.500 LSA 115º, while other sources rate it 224º/224º @.050 .510/.510 LSA 115.5º. Either way it's the same cam. They have a version of this cam ground +5º as part# 10185060. The 14096209 cam has an intake lobe centerline of 114º ATDC and the 10185060 has an ICL of 109º ATDC advancing the ICL 5º. Both part #s are still active @ Scoggin-Dickey.

Bob

Yoots,

Here is the link


http://store.chevroletperformance.co...-14096209--%3E


Bob

I just opened up an original 454 mag carb engine that had been sitting for years..... You are welcome to the stock cam if you like.... this was a forged crank motor with dimple rods and 7-16 bolts so I guess it was the High power version... there are some numbers on the end of the cam I can get you if you like... everything looks real good and I am using the crank for a nice buildup soon.... TBF

sounds good I will check the #'s if it is a stock cam from a mag and in good shape I'll take it... Thanks Frank 732-397-6757.

OK I will take a pick and get the numbers for you.... TBF

I sure don't want to rain on anyone's parade, but I would be careful running a used flat tappet cam if you don't have the original lifters going back on the same lobes they were broken in on. Success rate can be spotty, even when using new lifters on an old cam. If it is a roller, then no worries as long as the lobes are in good condition. I know you are just sending it down the road, but it would suck to have a willing buyer out on a test run and then have it start clattering when you take it back down to idle. A cam lobe can wipe itself out pretty quickly once things start to go south, and the metal fragments will circulate around in the oil and trash bearings, scuff cylinder walls, score oil pumps, etc. Ask me how I know. :rolleyes:

i 100% agree,for what a new flat tappet cam&lifters cost,it,s just not worth taking a risk with used stuff.

your cam offer
 

That cam sounds good if it is for a gen v block please call Frank 732-397-6757 thanks.

you guys are right
 

I accepted TPA's offer and appreciate it but then read your threads (Budman and Mike T) and realized how risky a used flat tappet swap could be especially without having the original lifters in the proper holes.Didnt think of it as I've been using rollers for a while.So I am back to square 1... GM discontinued the stock cam noted in Bob M's thread, tried calling some dealers to see if they had any new old stock and a replacement is n/a.Com Cams has that 262 marine cam with a 112 lsa but worried that it may revert with silent choice and want to sell boat with it installed.Has anyone used this cam or similar with diverters without a problem? It would really suck if I sold the boat and passed on a headache. Trying to do the right thing...

I would also advise against using a used flat tappet cam, or any used cam!

You stated in the first post that you are putting this back together to sell. Are you going to help the new buyer out when he wipes a cam lobe and takes the whole engine out this coming summer?

Spend the $300 bucks and do it right

Check the Comp Cam I linked in post #3. It's on a 114* LSA. Overall it's very close to original.

Yoots, I ran a Comp Cam's Xtreme Marine, can't remember the exact grind number, but it was a hydraulic flat tappet on a 112* LSA. IIRC, it was around 224* / 234*, .525 / .527 lift or thereabouts. I ran this cam for 9 years with Merc stock manifolds / risers and silent choice with oval port heads, dual plane intake and a Q-jet and never had a hint of reversion. This was on a .030 over 454. I think you will be fine. Cam manufacturer can probably give you some help picking one.

To 4bus... I was'nt looking for a used cam I only considered it when I found that the orig GM cam was discontinued and did not note in my orig post that I had silent choice when other members suggested cams that where close and worked for them.Anyway my best advice is to call comp cams and take their recommendation................Thanks Budman.

I ran a couple of Merc 420's with iron exhausts for a couple of years with no reversion. They were about 226/236 .540/.560 lift or so. Crane made them and they were used in 370, 400, 420, 525sc.

are you sure about stock specs ?

what cam are they referring to in these specs

http://www.perfprotech.com/blog/arti...specifications

That link you posted has incorrect cam specs. Not uncommon in the merc manuals!