So I run across this old guys truck (502 GM crate motor)

[CMACDONALD1]

Yeah It is the 450hp version but not sure what generation. Yes it has all the forged crank rods and roller cam but no roller rockers. May add the roller rockers at a latter date. I was thinking about puting the engine in my biscayne but we will see. Just too many projects at the moment. Hated to pass on the truck so thats why it resides at my house now. Seems like a real stout motor though. I love the big blocks.

[gumbys10]

Nice find, that is my favorite body style and reg cab long box as well. Where's the burnout pics lol.

[meatwagon83]

Originally Posted by gumbys10

Nice find, that is my favorite body style and reg cab long box as well. Where's the burnout pics lol.

you mean videos of rolling burn outs!!

[CMACDONALD1]

Originally Posted by meatwagon83

you mean videos of rolling burn outs!!

Ha Ha!

[rollin thunder]

this guy is jealous!

[zook]

your 502 crate might be a gm marine . they came without fuel pump and were designed to use electric pump. my 502 has electric pump also.
Either way what a great find. Did you burn some rubber yet?
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[Firebirdjones]

When the first generation of 502 crate engines came out in about 1992-3 None of them had provisions for a mechanical fuel pump. They also didn't have the provisions for a bell crank/Z-bar setup for a manual transmission.

It wasn't until some of the latest generation crate engines (which I believe they now call the Gen 6) that's been in production for a few years now that they finally cast these blocks for both mechanical fuel pumps and manual transmission linkage.

[meatwagon83]

Originally Posted by Firebirdjones

When the first generation of 502 crate engines came out in about 1992-3 None of them had provisions for a mechanical fuel pump. They also didn't have the provisions for a bell crank/Z-bar setup for a manual transmission.

It wasn't until some of the latest generation crate engines (which I believe they now call the Gen 6) that's been in production for a few years now that they finally cast these blocks for both mechanical fuel pumps and manual transmission linkage.

i was just gonna say this, gen 5 has no mechanical fuel pump boss or provisions for a manual clutch, a gen 6 does, i also believe you can use gen 6 heads on any big block (excluding 8.1)

[Firebirdjones]

Originally Posted by meatwagon83

i was just gonna say this, gen 5 has no mechanical fuel pump boss or provisions for a manual clutch, a gen 6 does, i also believe you can use gen 6 heads on any big block (excluding 8.1)

Yeah, except I ran into a little hitch with my gen 6 502 last year. Bought it new from Scoggin/Dickey.

Although the mechanical fuel pump boss is there and I had mounted a fuel pump with it's pushrod. It still wouldn't run the pump. On the dyno we used an electric pump so I didn't find this out until the engine was installed in the truck,,,,UGH!!!

Once I realized the pump wasn't working I called Scoggin/Dickey to get the scoop. Found one of two things that could be going on.

Either the roller cam GM installed doesn't have the accentric to run the pump pushrod,,,,or the block wasn't drilled completely through for the pushrod to reach the accentric on the camshaft. Either way the engine would have had to come back out to fix the issue, it was under warranty of course. At this point I removed the pump, left the pushrod in and stuck my finger in there holding the pushrod against what should have been the camshaft accentric while my wife cranked over the engine. I felt absolutely nothing on my fingertip, not even a vibration or any type of movement. Even if the camshaft didn't have the accentric I believe I should have still felt the pushrod rubbing on the camshaft. So I came to the conclusion that the pushrod hole simply isn't drilled completely through the block to reach the camshaft accentric.

I decided at that point (since it was full of fluids and ready to fire off) to just run an electric pump on the truck and forget it for now.

So buyer be warned

[meatwagon83]

Originally Posted by Firebirdjones

Yeah, except I ran into a little hitch with my gen 6 502 last year. Bought it new from Scoggin/Dickey.

Although the mechanical fuel pump boss is there and I had mounted a fuel pump with it's pushrod. It still wouldn't run the pump. On the dyno we used an electric pump so I didn't find this out until the engine was installed in the truck,,,,UGH!!!

Once I realized the pump wasn't working I called Scoggin/Dickey to get the scoop. Found one of two things that could be going on.

Either the roller cam GM installed doesn't have the accentric to run the pump pushrod,,,,or the block wasn't drilled completely through for the pushrod to reach the accentric on the camshaft. Either way the engine would have had to come back out to fix the issue, it was under warranty of course. At this point I removed the pump, left the pushrod in and stuck my finger in there holding the pushrod against what should have been the camshaft accentric while my wife cranked over the engine. I felt absolutely nothing on my fingertip, not even a vibration or any type of movement. Even if the camshaft didn't have the accentric I believe I should have still felt the pushrod rubbing on the camshaft. So I came to the conclusion that the pushrod hole simply isn't drilled completely through the block to reach the camshaft accentric.

I decided at that point (since it was full of fluids and ready to fire off) to just run an electric pump on the truck and forget it for now.

So buyer be warned

my guess would be the cam didnt have the eccentric on it