Looks like somebody went through the trouble and expense to build this as an internal balance 400!

The JE622E is a 1.062 compression height expressly made for a 3.75 inch stroke and a 6 inch rod for a zero decked 400 block.

The rest of crank with mallory metal, the standard 350, 8 inch damper and pin holed 350 flex plate speaks to this has been through a balance shop as do the cap screw 6 inch rods.

Obviously this was build by somebody that knew what they were doing. My guess it was intended to race, this is a lot of work and expense just for cruise nights.

Bogie

 

Looks like somebody went through the trouble and expense to build this as an internal balance 400!

The JE622E is a 1.062 compression height expressly made for a 3.75 inch stroke and a 6 inch rod for a zero decked 400 block.

The rest of crank with mallory metal, the standard 350, 8 inch damper and pin holed 350 flex plate speaks to this has been through a balance shop as do the cap screw 6 inch rods.

Obviously this was build by somebody that knew what they were doing. My guess it was intended to race, this is a lot of work and expense just for cruise nights.

Bogie

Thank you very much that helps alot! Pretty good steal then considering the dude i got it off thought it was an above average 350

 

Sorry , I'm not seeing the Mallory metal . Scat & probably eagle make an internal bal 3.75 stroke crank using 6" rods , the capscrew rods are an upgrade . Look for identifying marks on crank , rods & pistons . Studs on the mains is also an upgrade, I'm a bit surprised at the condition of the balancer . Did you hear it run ? Run a compression & leakdown check ?

 

Without tearing it fully apart, I couldn’t find any additional markings on the rods or crank for the moment. No I haven’t heard it run and it had been sitting for a while. Will do compression and other checks when I put it back together.

 

Last counterweigh visible on a line between last main cap bolt and the oil filter mount.

Bogie

 

Mallory in the front big counterweight as well. Installed correctly, sideways through the counterweight.

I also see aftermarket splayed bolt steel main caps with studs.
Someone spent a good bit of money building that engine.

I would measure the crankshaft stroke, the same piston could be used to build a 6.125" rod 377" de-stroker, they have some popularity with the circle track guys.

Use of a stock internal balance damper seems a little odd with such good internal pieces....but maybe they were trying to fool tech inspection or just the general public as to what the engine is.
Circle track and grudge street racers tend to be secretive.

 

Well, looks like they spent all this time and effort and used some terrible 991 heads but changed out the rocker arms and springs dunno how they pair with the dished JE pistons

 

If built to be raced it’s likely the SMOG heads and QJet intake are the result of association rules requiring these parts. Otherwise it’s a poor choice for a top end especially given the work that went into the short block.

Bigie

 

Heads are typical of a lot of street stock circle track rules that don't allow aftermarket heads to be used.
With the stout bottom end, that would be my guess, it was originally built for circle track use.

 

Thanks for the info guys