302 2v to I6 conversion
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Posting Guru
Joined: Jul 2015
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From: Northeast Ohio USA
302 2v to I6 conversion
I have the opportunity to purchase a recently rebuilt (by a 20 year
FoMoCo Dealer Tech) complete from air cleaner to oil pan '82 300 I6 at a
"very cheap" price.
The 302-2v I currently have is a recently rebuilt '86 block with a HEI conversion (the original ignition components remain intact, just disconnected) which I can sell for twice what I have into it. I love the workhorse reputation and simplicity of the I6's. My questions are: Can I retain my C6, and what are the differences in engine perches/mounts? I'll get into split exhaust manifolds and dual exhaust later
Thanks Ya'll. 
FoMoCo Dealer Tech) complete from air cleaner to oil pan '82 300 I6 at a
"very cheap" price.
The 302-2v I currently have is a recently rebuilt '86 block with a HEI conversion (the original ignition components remain intact, just disconnected) which I can sell for twice what I have into it. I love the workhorse reputation and simplicity of the I6's. My questions are: Can I retain my C6, and what are the differences in engine perches/mounts? I'll get into split exhaust manifolds and dual exhaust later
Thanks Ya'll.
Elder User
Joined: Jun 2009
Posts: 907
Likes: 6
From: nw pa.
Hey,
You will need to remove the 302 mounts and perches.
A different radiator.
You can keep the c6.
I have not done this myself but have been reading a lot about it.
I'm not sure about which flex plate to use.
Love my 6 !
You will need to remove the 302 mounts and perches.
A different radiator.
You can keep the c6.
I have not done this myself but have been reading a lot about it.
I'm not sure about which flex plate to use.
Love my 6 !
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Posting Guru
Joined: Jul 2015
Posts: 2,239
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From: Northeast Ohio USA
I spend more than that on beer in a month.....ssshhh again, lol.As far as the radiator goes, I have been wanting to go to a three deep radiator as well as a remote trans cooler anyway so that's all good.
I'm hoping the flexplate is interchangeable.
FTE Legend
Joined: Nov 2015
Posts: 30,912
Likes: 4,123
From: Angier, NC
First I am no expert so take it for what it is.
On the flex plate I don't think they are from what I have seen posted just for the v8's.
I say this because I think just between 1 v8 CID size (302?) they have 2 different flex plates and guessing fly wheels based on weight.
If I under stand it right the motor is external balanced.
So even if it did bolt up and I don't know if it would the balance would be off and could kill a motor is short time.
I know this is vary true with AMC motors as they are external balanced and the I6 (258) flex/fly will bolt up to any of the 71 and newer v8's crank.
Dave ----
On the flex plate I don't think they are from what I have seen posted just for the v8's.
I say this because I think just between 1 v8 CID size (302?) they have 2 different flex plates and guessing fly wheels based on weight.
If I under stand it right the motor is external balanced.
So even if it did bolt up and I don't know if it would the balance would be off and could kill a motor is short time.
I know this is vary true with AMC motors as they are external balanced and the I6 (258) flex/fly will bolt up to any of the 71 and newer v8's crank.
Dave ----
Cargo Master
Joined: Mar 2007
Posts: 2,935
Likes: 34
From: Arcadia, Fla
You MUST get the I6 flexplate as the 302 has a counter weight on it and the 300 I6 does not.
When I swapped out a wore out 302 with a rebuilt 300, I just ground off the counter weight of the 302 flexplate and did a "model airplane prop" balance job to verify there was no heavy spots on it. The 300 I6 flexplate is a neutral balanced part unlike the 302/351 flexplates.
When I swapped out a wore out 302 with a rebuilt 300, I just ground off the counter weight of the 302 flexplate and did a "model airplane prop" balance job to verify there was no heavy spots on it. The 300 I6 flexplate is a neutral balanced part unlike the 302/351 flexplates.
Thread Starter
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Posting Guru
Joined: Jul 2015
Posts: 2,239
Likes: 5
From: Northeast Ohio USA
First I am no expert so take it for what it is.
On the flex plate I don't think they are from what I have seen posted just for the v8's.
I say this because I think just between 1 v8 CID size (302?) they have 2 different flex plates and guessing fly wheels based on weight.
If I under stand it right the motor is external balanced.
So even if it did bolt up and I don't know if it would the balance would be off and could kill a motor is short time.
I know this is vary true with AMC motors as they are external balanced and the I6 (258) flex/fly will bolt up to any of the 71 and newer v8's crank.
Dave ----
On the flex plate I don't think they are from what I have seen posted just for the v8's.
I say this because I think just between 1 v8 CID size (302?) they have 2 different flex plates and guessing fly wheels based on weight.
If I under stand it right the motor is external balanced.
So even if it did bolt up and I don't know if it would the balance would be off and could kill a motor is short time.
I know this is vary true with AMC motors as they are external balanced and the I6 (258) flex/fly will bolt up to any of the 71 and newer v8's crank.
Dave ----
the '70's answer to the Edsel.
FTE Legend
Joined: Nov 2015
Posts: 30,912
Likes: 4,123
From: Angier, NC
You MUST get the I6 flexplate as the 302 has a counter weight on it and the 300 I6 does not.
When I swapped out a wore out 302 with a rebuilt 300, I just ground off the counter weight of the 302 flexplate and did a "model airplane prop" balance job to verify there was no heavy spots on it. The 300 I6 flexplate is a neutral balanced part unlike the 302/351 flexplates.
When I swapped out a wore out 302 with a rebuilt 300, I just ground off the counter weight of the 302 flexplate and did a "model airplane prop" balance job to verify there was no heavy spots on it. The 300 I6 flexplate is a neutral balanced part unlike the 302/351 flexplates.
What we say to do is get a good flex/fly and if you have a bad flex/fly for the right size motor have it match balanced to the right one. This is more so if going from auto to stick you take the fly wheel and have it matched balanced to the flex plate.
So you can do the same for the ford motors too.
Dave ----
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