1987 Monte Carlo SS Build - Aka Project Grown

64nailhead

Goat Herder
Supporting Member
Dec 1, 2014
2,481
113
Upstate NY
You won't have enough motor to notice a horsepower difference between the 823 heads on the 6.2 and the AFR heads. But with that cam your dynamic compression would make the static compression manageable. Are you going with an MSD ignition module?
He's looking at almost 420 cubic inches - those heads won't hurt. But I would say that a set of 243's would get him to his goal as well. He should be able to hit his goal, but I don't think this will be a friendly car on the street with a stick - but sometimes, unfriendly is more fun :)
 

Pro86tourn

Apprentice
Thread starter
Apr 26, 2020
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You won't have enough motor to notice a horsepower difference between the 823 heads on the 6.2 and the AFR heads. But with that cam your dynamic compression would make the static compression manageable. Are you going with an MSD ignition module?
I beg to differ, the AFR heads rock the house. I know people love square port heads but they will smash the stock 823s all day long. https://ls1tech.com/forums/dynamome...r-230-heads-now-updated-w-chassis-dyno-s.html

Yes I run MSD.

I had the cam ground that way to balance the dynamic compression to make the static compression manageable..still need to find a way gasket, shave pistons or get new pistons all together.
 
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Pro86tourn

Apprentice
Thread starter
Apr 26, 2020
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He's looking at almost 420 cubic inches - those heads won't hurt. But I would say that a set of 243's would get him to his goal as well. He should be able to hit his goal, but I don't think this will be a friendly car on the street with a stick - but sometimes, unfriendly is more fun :)
I had a set of CNC 243s, took them off and put the AFRs on my 6.0 stock bottom end and the car rocked the house, got down like James brown.

As far as the car and my goals.. I want it to be like driving a hand grenade.

Car has no heat, no wipers, no insulation... just smiles per gallon baby! :)
 

Pro86tourn

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Apr 26, 2020
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Well.... 468 cube LS with factory LS3 heads made 691hp... Needed really big Mast Motorsports heads to make more than a 30hp increase. Up to you I guess.


468 cubes to make 691 hp is pretty weak.

Even at the end of the video he said if he 'had' to upgrade he would go cathedral port as they picked up a ton. I already own the heads bought and paid for, no argument for the flow of the LS3 units but I plan on selling them to help recoup costs of my LS3 engine purchase :)

My intake is also cathedral port and will be a cause of power loss 100% but I really don't want to buy a new hood at this time
 

Northernregal

Sloppy McRodbender
Supporting Member
Oct 24, 2017
1,986
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Red Deer AB
468 cubes to make 691 hp is pretty weak.

Even at the end of the video he said if he 'had' to upgrade he would go cathedral port as they picked up a ton. I already own the heads bought and paid for, no argument for the flow of the LS3 units but I plan on selling them to help recoup costs of my LS3 engine purchase :)

My intake is also cathedral port and will be a cause of power loss 100% but I really don't want to buy a new hood at this time
Just giving a point of view.

The difference between your plan and that motor is 10% (roughly) displacement. So take 10% out of the 468" HP number for 630hp on your combo. Ballpark. 30hp less and no issues with pump gas, and not trying to force a non-ideal combo to work together.

Or get more cam, wind it up and use the combo where its going to be happy. That motor is gonna want more cam. 😉👍
 

Pro86tourn

Apprentice
Thread starter
Apr 26, 2020
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Update!

Ordered a bunch of parts for the new engine, got the block back from the machine shop and sold my 6.0!

I also picked up a Ford 8.8 out of a fox body. My plan is to build it fresh, 9 inch ends, Willwoods, etc ...

Recommendations for diff unit? also Im running UMI upper and lower control arms with Ridetech coil overs... anyone running this setup with a 8.8? Can I use the UMI uppers or do I need to buy the trick chassis kit?

Id love to hear from some people who have done the 8,8 swap !
 
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