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SPEED MASTERS CC 05-25-2013 08:57 PM

My 400 sbc survived the cam break-in!
I broke in the cam with valvoline vr1 20-50w and a bottle of lucas break-in additive. I was sweating it big time! The cam is a flat tappet .575 lift 250 duration @ .05 on a 106 lsa. 11.7-1 comp. As soon as the engine fired I revved it to 3000 rpm. I fluctuated the rpm from 3000 to 2500 for 30 min. This a budget type motor. 200 cc heads, flat top claimer pistons, stock crank, eagle rods, msd ignition, dual edelbrock carbs.The more I work with the edelbrock carbs the more i like them... I ran the motor on 110 octane gas. We have about 30 guys in our car club that all use this form. Thanks for all the past help!

ap72 05-25-2013 09:01 PM

Impressed you got that lift to work out a d edelbrock carbs to run well with that duration. Which carb model? They can be tricky with larger duration cams.

vinniekq2 05-25-2013 09:47 PM

what kind of heads? post a video

Richiehd 05-26-2013 05:27 AM

Who's cam?

camaroman7d 05-26-2013 10:13 AM

You ran full spring pressure for break in? I am assuming you have dual springs.

SPEED MASTERS CC 05-26-2013 10:47 AM

The carbs are 500 cfm (each). The intake is the old edelbrock c-26 (for looks). The linkage is progressive. I did not touch the carbs! They ran great for the break-in. (The engine was run on a break-in stand.) The block is filled with hard block to the side freeze plugs. It ran cool the whole time at 180 ish. The heads are world products sportsman 2's, I know they are sub-par head today, but I had these in stock and they were professionally pocket ported. This whole motor was done on a pretty tight budget and still cost a lot... The cam is from comp. It is a custom grind. The springs are from Howards: Dual type with 135 on the seat 285 open pressure. I ran these springs with comp stainless 1.6 rockers. This is my first complete motor build I did myself. I used a chevy Z-28 oil pump and matching pan with tray from G.M. I used arp fasteners on everything. I now want to convert the carbs to run on E-85. The only carb guy that I could find that does edelbrock conversions is in Minnesota at a cost of $300 each! Ouch! I cannot find kits or info on how to do the work myself... I was told the carbs are too small for this size engine, but they are what I had purchased from another club member for a great deal. So, I ran what I had" ... I am planning on putting on 1 inch carb spacers next. I have the break-in video from a smart phone that looks great, unfortunately I am currently not smart enough to know how get the video to post here. I sent it to my email, but that is as far as I got with it...

Again thanks to the everyone on the forum, your posted info helped a bunch. Most of the guys in our club did not think the engine combo would work as well as it does. I am pretty stoked!

1Gary 05-26-2013 11:25 AM

No synthetics for the life of the engine.A race oil like Joe Gibbs for every oil change after the break-in.We have seen lobe failures many miles later with the wrong choices.

vinniekq2 05-26-2013 11:31 AM

post a video.The easiest way is to start a youtube acct and follow their instructions,then just post a link

SPEED MASTERS CC 05-26-2013 07:21 PM

Is Valvoline VR1 20/50 wt ok to run?

vinniekq2 05-26-2013 07:45 PM

20/50 is a good all round viscosity.You can adjust viscosities in accordance to build clearances and severity of engines use.

SPEED MASTERS CC 05-28-2013 08:33 PM

Here is the video link.

408 SBC CAM BREAK IN - YouTube

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