Questions about Gen5 454 BBC

« **on:** February 15, 2014, 11:12:29 AM »

I am looking at a complete, supposedly running gen 5 454, casting# 10114182, which is a 4 bolt block, with ,i am sure, cast internals. The engine is complete from throtle body to pan and fan to flex plate, including wireing harness and computer.
I am looking at this engine, to hopefully put in the boat, just to get back on the water for this season. The guy is wanting $480 and i am sure i can get it for $400. I was looking at the same engine, at my local junk yard, for $800+ tax.They are wanting $1000+ tax for a mark iv, at the junk yard!
I have a few questions about the difference between the mark IV and the gen5 engines.
I know the gen 5 has no fuel pump boss and i would have to run an electric fuel pump.

My main concerns are the oil pan and intake manifold/ carberator.
Would it be safe to run the stock oil pan or is it imperative to run a bigger oil pan.

Is there a difrence in intake manifold fitment, between mark iv and gen 5?
If not, how would a tunnel ram w/ two 600cfms work on a bone stock 454 truck engine? If not so good what might a good intake and carb be for a stock 454?

Are the front and rear bolt patterns the same between the mark iv and gen5? would my mark iv engine plates, fit the gen5?

Any thing else I need think about to just stick the engine in the boat and run it?

« **Reply #1 on:** February 16, 2014, 08:58:57 AM »

Intake fits the same as mkIV, But that is probably a truck 454, and has the dreaded peanut port heads. Probably not ideal for a tunnel ram.

Gen V heads have non adjustable rockers, too
Putting decent 781's or 049's on it would wake it up, Needs a certain head gasket though. (Gen V block to Mk IV heads)

Is this a factory roller cam motor?

Front timing chain cover has a provision for a cps, I think, but an aftermarket one would solve this.

If its a truck 454, the pan is too deep for a Berk, I dont know if there is a 'car' pan for the gen V or VI (one piece rear main) mk IV pan doesnt fit, either.
I used a Chevelle pan on my 454 (Mk IV) from Summit, 3 years now, no problems, but its just a low rpm day cruiser.

Front mount will fit, with the non-cps T/C cover.
rear fits just fine, and driveline is the same pattern, too.

A stock azz 330 hp 454 should turn an 'A' impeller to 46-4800 rpm, or so

Best manifold? I have 1 or 3 cast iron, Q-jet, MK IV you can have, or get any decent aluminum manifold and holley 750.

Ive seen a rectangle port vic. jr. on peanut port heads

Good luck , Hal

Dan'l

holorinhal

Questions about Gen5 454 BBC

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