502 efi gen v flat tappet to hydrolic roller
 

Hi . I have a 502 efi flat tappet and want to go hydrolic roller kit . But need to be exact same spec. So no need to retuned ecu . Only #on actual camshaft is 89594 and 6209

thanks

what year / Gen is the engine........mefi what

mefi 1. Engine is procharger just got a tuned from Tyler Crocket. Thats why i want to keep same spec .

You want to spend like $2k for no real performance increase?? Why???
Just because the lift/duration numbers are the same doesn't make the cams the same. You should call Tyler Crocket

long story short. Went for à tuned 3 week ago. Made 635 hp 722 tq . Everything was perfect . Went back home Québec. Put engine in boat went for à first ride everyting was ok didn't go over 3000 rpm ( wife was there doesn't like speeding ) couple day later went back alone. Try real pull engine wouldnt go over 4600rpm whit à weird noise . It's was a #3 intake lifter ( flat tappet engine )eating it self aswell as the cam . Engine is apart . I already talk whit Tyler . He told me you change the cam you change the tuned. And need to be hydrolic roller . This is why im asking this question . Other option is to leave it flat tappet whit same cam ( new ) , but whit waht happen im not really sure ... what would you do ?? If cam spec are not the same I need to retuned ecu that meen money I already put on tuned and travel to Michigan goes to garbage.

Any pictures of the bad lifter? A failure that early would make me think something happened during the break in. What brand lifters did you use?

I cant send picture till I have 10 post .... I can send you a pic via émail or something ?!? As for the lifter brand i will get this info as soon as machine shop open . Engine already as 60 hour on it before installing procharger.

So the engine was not refreshed when the pro charger was installed? You added the pro charger to a good working engine, and then the lifter failed?

Exactly

Is it a stock 502? To get those power numbers out of a stock 502 I would think you need quite a bit of boost

Stock engine bore to 4.320 . Only arp head stud , manley inconel valve , cometic head gasket . 4 pounds of boost they said .

Do you not have a boost gauge on the boat?

yes boost , egr , fuel pressure .

yes boost , egr , fuel pressure .

Were you seeing the same 4 psi on the boat as they saw on the dyno?

Yes .

But as I said it wouldnt go more than 4600rpm so did not go into full boost . But gauge was going this way

Yes .
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Now I have 10 post :D

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It is almost impossible to grind a roller cam with the same specs as a flat tappet. Your best bet will be to pick a cam grinder and send them your present cam so they can put it on a cam Doctor and see exactly what it is. Then try to get something as close as possible.

However what I would do is get a camshaft that is designed to work with the Pro Charger. Yes you will have to redo the tune but the proper cam will make a world of difference in the performance. And less chance of damaging the engine in other ways.

In that case, I would upgrade the cam to a larger roller and pay to get it retuned. You might gain another 40hp or more.
I would not try another flat tappet. The flat tappet cams of today fail often compared to years ago.

Ok. Thanks for your time . I'll go that way .. will find best hydrolic roller kit for my application and go back to Tyler's shop.
was hoping to find cheaper way to go but not always best option .... thanks again!

if it were me,I'd call bullet and have a cam made w/ a base circle that can use gm parts lifters,,the lifters won't break the bank.

you have O2 bungs in your exhaust?

yes innovate dual lamba. So i have reading on each side

so,before it blew up,what were you running for afr's?

Around 11.5- 12

do you have a cam spec in mind yet?you may be alright w/ the tune,of coarse you have to monitor it.

Talk whit Tyler yesterday. He will send me what I need as hydrolic roller kit and for my specific application and I will bring it to my machine shop ..

Mike Jones @Jones Cams has some good FT lifters.

If keeping the FT is your short/med term solution.
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I would agree that you now have the opportunity to source a proper supercharger friendly cam.

Gen V block will require the aftermarket link bar style lifters of course. Important to source quality roller lifters or you'll be in the same boat again.

What heads heads have got on the 502?

It is a gen 6 block . It was a complete gen V engine whit crack block du to bad winterized. And they rebuilt It on a gen6 block switching everyting on it. I dont know spec about head but i heard i have the good one
https://cimg7.ibsrv.net/gimg/www.off...04986a4a05.jpg
https://cimg4.ibsrv.net/gimg/www.off...04f366813d.jpg
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https://cimg9.ibsrv.net/gimg/www.off...eac397cd22.jpg

Looks like stock GM rect port heads with new valves.

To do the conversion, you will need:
Roller cam
Roller lifters
Roller rocker arms
New valve springs, retainers, locks
New pushrods--possibly will need to be made custom to length
ARP Rocker arm studs
Maybe a new timing chain set
Grind off the drip tabs on the inside of the valve covers to clear the roller rockers

Ok . thanks

Cam
 

What lifters should be used w 525 efi cam

[QUOTE=tripps;4903560]What lifters should be used w 525 efi cam[/QUOTE

Went whit Jonhson lifter for my rebuilt ..look whit them