90 C4 replacement engine
Thread Starter
Burning Brakes
Joined: May 2018
Posts: 939
Likes: 242
From: Fruita CO
90 C4 replacement engine
I'm looking at a 90 auto coupe, approx 110,000 miles. Decent body, paint and very clean interior, recent tires. Several months ago it blew a head gasket. Owner had both heads checked and new gaskets installed. As happens, enough coolant got in the oil to damage the bearings. I'm considering an ATK High Performance SP04 short block from Summit, swapping over everything including the factory roller cam (if its still good) from the original engine. Feedback from anyone that has used this engine would be appreciated.
Last edited by slammin; Sep 21, 2020 at 03:24 PM.
Team Owner
Joined: Oct 2004
Posts: 81,241
Likes: 3,062
From: altered state
St. Jude Donor '05
They are a very large rebuilder ;pretty sure they used to do GMs remans.
No personal experience only read about others.
Brandon of ATK used to post on this board not sure if he still does
Gm has a fewoptions of 350 and 383 shortblocks for pretty reasonable $.
Id go there as they are all new before a rebuild job
No personal experience only read about others.
Brandon of ATK used to post on this board not sure if he still does
Gm has a fewoptions of 350 and 383 shortblocks for pretty reasonable $.
Id go there as they are all new before a rebuild job
Last edited by cv67; Sep 21, 2020 at 06:55 PM.
Drifting
Joined: May 2007
Posts: 1,426
Likes: 165
From: Motor City
I’m currently putting a blueprint engines LT1 in mine. Looked at ATK, however i found quite a bit of negative feedback. Blueprint has had some issues with mine (knock sensor hole tapped incorrectly, cylinder head steam port bolt hole stripped), but the feedback from others looked encouraging.
Team Owner
Joined: Oct 2004
Posts: 81,241
Likes: 3,062
From: altered state
St. Jude Donor '05
https://www.chevelles.com/threads/10.../post-11393774
2200 for a 383 with forged crank, new GM block that isnt bad at all .
You could have an AFR headed stroker for right around 5kish-
https://smedingperformance.com/products/383-short-block
2200 for a 383 with forged crank, new GM block that isnt bad at all .
You could have an AFR headed stroker for right around 5kish-
https://smedingperformance.com/products/383-short-block
Last edited by cv67; Sep 21, 2020 at 07:35 PM.
