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Old 03-25-2020, 06:38 PM
69TempestCustomS 69TempestCustomS is offline
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Default 454 in a 69 tempest

the 454 will pretty much drop in but I understand, that to use the same year frame mounts for a bbc I may have to drill a new set of frame mounting holes for those chevy frame mounts. Some have stated that the holes are already there, others state that the Pontiac holes are the same ones as those used for the chevy, Dose anybody actuall know with absolute certainty

and will the Pontiac z bar work with a bbc or will I need to get a chevy one.

Are the z bars the same length?

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Old 03-25-2020, 09:54 PM
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You may want to run new fuel lines as if it was a Chevelle, along with engine harness.

oh, and don a firesuit as certain members here get a real case of the ass about BBC's in Pontiacs.

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Old 03-28-2020, 08:58 PM
69TempestCustomS 69TempestCustomS is offline
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thanks. I will take the fire suite advice .

just for the record I bought a 1982 RV with 23k miles on it. paid 1000$ sold the tires and rims for $800 and sold the RV for $800. cost 175 to rent a torch and cut the engine and trans out of it. so it is more cost effective than a Pontiac v8. the car has the ohc 1bbl six with about 170K miles on it and a 3 speed on the floor.

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Old 03-29-2020, 12:27 AM
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You cut the engine and trans out with a torch and still got 800 for the shell?


*tips hat*

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Old 03-29-2020, 04:06 AM
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Scott Thelander Scott Thelander is offline
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and
no tires and wheels !!

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Old 03-29-2020, 06:55 PM
69TempestCustomS 69TempestCustomS is offline
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The curved glass windshield are almost impossible to replace and several people just wanted them and were offering silly money just for them.

it had a very low hours on a 3 k gas generator, the rims and tires, seven of them were 900 20 Michelin radials.

I got the complete 454 and a very heavy duty 400(475?)

three years ago I bought a similar 75 dodge with a440/727 for 800$ and sold just the engine for 1500$ it had 43k miles on it. the bottom end was all steel. tires generator and glass sold for 1200. But I had a very hard time getting rid of the carcass. This time I made sure it was all sold befor parting it out.

The thing is that a dodge wont fit in a tempest.... or will it? Hmm.

any way, it can be argued that the 454 is most cost effective route at this point. granted, its a truck 454 with the round port heads but that's easily and cost effectively corrected,

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Old 03-29-2020, 07:03 PM
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Easy enough to bolt the trans and engine together as a unit and drop it all in place using the trans mount to locate the entire assembly front to rear. Have the engine mounts and the big block frame stands in place to center the engine and drill whatever holes necessary if they arenít already there. I seriously doubt the holes will be in the right spot already.

Source your clutch linkage pieces for a big block Chevelle, most if not all Pontiac pieces here wonít fit.

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Old 03-30-2020, 10:13 PM
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Big block chevy is 4 inches longer than a ponch motor.You will notice that when you install the fan blade

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Old 04-01-2020, 01:06 PM
69TempestCustomS 69TempestCustomS is offline
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Good points all. So to put the 454 in and have clearance for the radiator I'm thinking of removing all the existing 1982 truck pulleys, brackets and hardware and replacing them with 1969 Chevelle pulleys, brackets and hardware. I am in luck because the car has no accessories to complicate the install. That's a good idea using the rear motor mount to locate the 454. I was thinking along those lines as well. and with that in mind I was looking at using a Chevelle cross member which bolts directly to the frame rather than the Pontiac one which moves around in a pair of rubber insulators.

So far
1. I'm going with the Chevelle transmission crossmember
2.I'm going to use the Chevelle frame and motor mounts
3.I'm going to use the chevy v8 z bar
4. I'm using the Chevelle v8 bbc engine harness
5. routing the fuel line, fortunately the ohc six and bbc fuel pumps are on the same side. diameter may be an issue down the road
6 pulleys brackets and hardware for a late 60's Chevelle bbc

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Old Today, 10:19 AM
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Nothing wrong with a Chevy engine in a Pontiac. Much cheaper deal all the way around you can almost buy components off the rack at Walgreens.

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Old Today, 12:18 PM
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Default pretty eazy swap

I have done this swap in a 1966 Lemans. The frame mounts will bolt directly where the old Pontiac ones were. You will probably need to replace the oil pan with a Chevelle one as the one I had were out of a 80's truck hit the crossmember. The clutch shaft will be from a Chevelle. The fuel line is on the wrong side and the starter wires need extending. I put a Chevelle battery box in helps and is cheep. The pulley system I had were out of a 68 Caprice for my first swap. Done in 1970's! Between small block and big block I have done this swap a few times. Course if you use the transmission, makes it easier as you do not have to buy bellhousing, flywheel and clutch! Then the problem is the crossmember need slid back. Keep the front yoke and shorten the drive shaft. text me at three fivetwo208threeseven3five.
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