64 intake on 65 engine

Will a 64 300 intake fit on 65 300 engine?

 

If you use the 64 gaskets.

 

Yes, BUT it will be a performance loss due to the smaller ports. I guess it could be "Ported" to help in that department, but who wants to take a chance on making it worse.

Tom T.

 

Yes, I've done it. As Tom mentioned the '64 ports are a little smaller, maybe 1/8". I can't definitively say if the 4 bbl alum intake is an improvement over a 65 2bbl intake or not. It's been about 20 years since I did the swap.

 

I thought I read some where the performance specs where the same on a 64 4bl engine and a 65 4bl engine?

 

The 64 300 had aluminum heads and intake, 65 was cast iron.

 

64 V-8 -300 cid 250 hp;335 torque; 11:1 compression ( al heads and intake) RP 4GC Carb

65 V-8 -300 cid 250 HP 335 torque; 10.25:1 compression. Carter AFB Carb

Both were the optional 4bbl engine.
Data from Ethyl Corp "Brief Passenger Car Data" 1964 and 1965

 

Info from TA Performance:
1964 Intake dia. 1.63" Exhaust dia. 1.31"
1965 Intake dia. 1.812" Exhaust dia. 1.375"

 

I recently put a 64 intake and 64 heads on my 65 shortblock, so not exactly what op was asking about. I also put Poston's headers on at same time, so I don't know what apples-to-apples comparison is. It feels a lot stronger at low rpms, but I think it is running out of air at 4500-5000 rpm because of the smaller intake valve. I am also running a Holley 600 cfm carb with an adapter plate. The adapter plate acts somewhat like a Nascar restrictor plate.

 

The difference in the port sizes isn't much. I'd say closer to 1/16" than 1/8". Odds are pretty good that the 4bbl aluminum intake will give more power than the 2bbl cast iron one.

The aluminum 4bbl intake is much more valuable.

Jim

 

I put the 64 intake on my 66 300 with a 500 AFB. Woke that little motor up. Originally a 2bbl. Ran it like that back in the early 90s.

 

FJM568 did you match the ports or slap it on and run it?

 

I ran a 64' 300 aluminum 4 barrel intake on my 66' 300 back in the day. It The ports were bigger on the intake then the heads. I used the 64' intake gaskets. It bolted on no problem. Only issue I had was that the first time I bolted it up it had a vacuum leak. I took it off again and coated the metal gaskets with a fine layer of silicone then installed again. It ran fine after. I would use spray tack gasket spray nowadays. I ran a 625 Carter AFB carb with it. I also did dual 2 1/4" exhaust at the same time. The car ran significantly better. It was a lot stronger. These days I would maybe gasket match the head ports to the intake ports but they were not that big of a difference. Mine ran fine without doing that.
Greg