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Old 02-12-2005, 07:48 PM
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EFI camshafts

Will an EFI camshaft work with a carbureted set-up????
I was just wondering because i hava 1970 302 thats roller( maybe someone converted it, i dont know, i never knew roller was around in 1970.
Anyways, if i bought a roller cam for a 80's 5.0 will it screw up anything in my block being carb???

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Old 02-12-2005, 09:33 PM
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All years were very lame from a performance standpoint. Duration was only in the 179 to 207 range on the intake and 194 to 203 on the exhaust with lift in the very low .400 range at best. Lobe sep ranged from 109 to 114 mild to "hot". In other words pretty friggen lame for performance.

They would work just fine on a carb but it would be pokey at best.
These are very small rollers. No 302 in the late 60's, came with a roller so yours is a retrofit. Carbed 302's were last made in 1969 by the way. Best to send your cam in to have run on a cam doctor or the numbers looked up, then choose a better match if needed.
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Old 02-12-2005, 10:55 PM
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if it didnt have a carb after 1969 what did it have??? Cuz my car if you look up the numbers came with a 302...and its a 1970 mustang..
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Old 02-12-2005, 11:58 PM
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83 5.0

my buddy had an 83 5.0L mustang... and it had a carb from the factory. and last time i checked the 5.0 was a 302
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Old 02-13-2005, 12:04 AM
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Sorry I was assuming you were talking about a chevy.
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Old 02-13-2005, 08:45 AM
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Might be a good idea to determine how your engine is a roller.

Get the casting number off the block, if its a newer block (mid 80's and after) then you have no problems, its a roller block.


If its an older block (before mid 80's) then there is a chance you have a reduced base circle camshaft installed along with oe roller hardware/lifters OR there is a chance they installed a standard base circle camshaft and retrofit roller lifters, which would be a good thing as the retro linked roller lifters are stronger than the oe setup.

If you find a reduced base circle camshaft then and OE camshaft will not work unless you take the necassary steps to make it work (afermarket linked roller lifters).

There is a high likelihood the engine is a roller block, meaning it used to be efi and only the efi were roller, so chances are your using a efi roller cam now.

Once you determine whether its reduced or standard base circle camshaft, go aftermarket, you won't gain much by going with another stock roller cam, chances are you have the HO cam now and you'd be switching one grind for the same grind.

Last edited by 357f-150; 02-13-2005 at 08:51 AM.
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