Repowering an 84 Crossfire
Thread Starter
Cruising
Joined: Jul 2016
Posts: 11
Likes: 1
From: Beaumont Texas
Repowering an 84 Crossfire
Decided to repower my stock 84, since it has close to 100k I'm building a new motor and will make the swap when complete. Its all a piece at a time, so if anyone has any input they would like to share please do.
I purchased a used motor that reportedly had three passes on it in a mud racer, insides are clean and crosshatch in the cylinders clearly visible, had 76cc smogger heads so I am replacing those.
Here is what I have so far to work with
4 bolt main bored .060
Mahle flat top pistons (10.6-1 with 64cc heads)
Iron Eagle 6" H rods
Have not ID'd the crank yet but its not stock
Have not ID'd the oil pump (suspect its hi volume)
Comp Cams 12-210-2 cam (if I decide to run it)
HEI ignition
Purchased so far:
Ham Board for EBL ECM (ECM not purchased yet)
Dart 64cc heads with 180cc runners (P/N 10121112)
On the list:
Renegade Intake
Roller Rockers
Long tube headers
EBL ECM
Rebuild 700R (High stall converter if camshaft replacement warrants)
Possible different cam and lifters
Hardened pushrods (Required for the Dart heads)
I purchased a used motor that reportedly had three passes on it in a mud racer, insides are clean and crosshatch in the cylinders clearly visible, had 76cc smogger heads so I am replacing those.
Here is what I have so far to work with
4 bolt main bored .060
Mahle flat top pistons (10.6-1 with 64cc heads)
Iron Eagle 6" H rods
Have not ID'd the crank yet but its not stock
Have not ID'd the oil pump (suspect its hi volume)
Comp Cams 12-210-2 cam (if I decide to run it)
HEI ignition
Purchased so far:
Ham Board for EBL ECM (ECM not purchased yet)
Dart 64cc heads with 180cc runners (P/N 10121112)
On the list:
Renegade Intake
Roller Rockers
Long tube headers
EBL ECM
Rebuild 700R (High stall converter if camshaft replacement warrants)
Possible different cam and lifters
Hardened pushrods (Required for the Dart heads)
Drifting
Joined: Mar 2015
Posts: 1,275
Likes: 165
From: Utah
Sounds like fun, i did something like that with mine, but i left the bottom end alone, upgraded heads, renegade intake, camshaft, roller rockers, long tube headers, exhaust system, and ebl flasg ecm.
blew my trans shortly after, now the trans should be totally bullet proof as it sits.
For converter, i had a 2400rpm stall before the pump blew up on me.
I liked it, but when i replaced the pump (sprung for the billet rotor this time around), i went for a 9.5in converter with a 3200rpm stall.
i have had it out maybe 3 times so far, still breaking it in...
I love the difference, car revs faster, and the rpm also lowers quicker (for times when i bump the throttle).
And i can get the tires screeching on que, requires me to hold back to prevent it...
Granted, my tires suck a little...
i also found 84 brakes are very lacking, especially on the freeway when everyone comes to a sudden stop, i did a C5 brake conversion that also required larger wheels, so i have C5 wheels as well.
blew my trans shortly after, now the trans should be totally bullet proof as it sits.
For converter, i had a 2400rpm stall before the pump blew up on me.
I liked it, but when i replaced the pump (sprung for the billet rotor this time around), i went for a 9.5in converter with a 3200rpm stall.
i have had it out maybe 3 times so far, still breaking it in...
I love the difference, car revs faster, and the rpm also lowers quicker (for times when i bump the throttle).
And i can get the tires screeching on que, requires me to hold back to prevent it...
Granted, my tires suck a little...
i also found 84 brakes are very lacking, especially on the freeway when everyone comes to a sudden stop, i did a C5 brake conversion that also required larger wheels, so i have C5 wheels as well.
here is a run i did yesterday, I'm breaking in the converter, and pump so I'm taking it easy.
https://youtu.be/_raQmpL1UE0
Sound comes from a melrose exhaust system with a second xpipe, and flowmaster 40's.
here is a run i did yesterday, I'm breaking in the converter, and pump so I'm taking it easy.
https://youtu.be/_raQmpL1UE0
Sound comes from a melrose exhaust system with a second xpipe, and flowmaster 40's.
Thread Starter
Cruising
Joined: Jul 2016
Posts: 11
Likes: 1
From: Beaumont Texas
Sounds like fun, i did something like that with mine, but i left the bottom end alone, upgraded heads, renegade intake, camshaft, roller rockers, long tube headers, exhaust system, and ebl flasg ecm.
blew my trans shortly after, now the trans should be totally bullet proof as it sits.
For converter, i had a 2400rpm stall before the pump blew up on me.
I liked it, but when i replaced the pump (sprung for the billet rotor this time around), i went for a 9.5in converter with a 3200rpm stall.
i have had it out maybe 3 times so far, still breaking it in...
I love the difference, car revs faster, and the rpm also lowers quicker (for times when i bump the throttle).
And i can get the tires screeching on que, requires me to hold back to prevent it...
Granted, my tires suck a little...
i also found 84 brakes are very lacking, especially on the freeway when everyone comes to a sudden stop, i did a C5 brake conversion that also required larger wheels, so i have C5 wheels as well.
blew my trans shortly after, now the trans should be totally bullet proof as it sits.
For converter, i had a 2400rpm stall before the pump blew up on me.
I liked it, but when i replaced the pump (sprung for the billet rotor this time around), i went for a 9.5in converter with a 3200rpm stall.
i have had it out maybe 3 times so far, still breaking it in...
I love the difference, car revs faster, and the rpm also lowers quicker (for times when i bump the throttle).
And i can get the tires screeching on que, requires me to hold back to prevent it...
Granted, my tires suck a little...
i also found 84 brakes are very lacking, especially on the freeway when everyone comes to a sudden stop, i did a C5 brake conversion that also required larger wheels, so i have C5 wheels as well.
here is a run i did yesterday, I'm breaking in the converter, and pump so I'm taking it easy.
https://youtu.be/_raQmpL1UE0
Sound comes from a melrose exhaust system with a second xpipe, and flowmaster 40's.
here is a run i did yesterday, I'm breaking in the converter, and pump so I'm taking it easy.
https://youtu.be/_raQmpL1UE0
Sound comes from a melrose exhaust system with a second xpipe, and flowmaster 40's.
Race Director
Joined: Oct 2008
Posts: 19,227
Likes: 1,672
From: Long Island
If you can go 383 the reward is great and not that expensive.
I did with a carb. Very quick and reliable.. lower cost.
If I was to do it again I would go with a GM crate 383 -base and upgrade the cam.
I did with a carb. Very quick and reliable.. lower cost.
If I was to do it again I would go with a GM crate 383 -base and upgrade the cam.
Safety Car
Joined: Nov 2005
Posts: 3,532
Likes: 1,185
From: Arizona - If you don’t know CFI, STOP proliferating the myths around it...
So, if it were me, I would go with a stroker of your choice of course. A 360 would be OK, but I wouldn't use that cam since it's a flat tappet. I would at least go with a roller that is comparable if you like that HE cam or something a little bigger like a XFI268 or custom grind. No sense having to worry about flatting a cam when you can go roller with a retro kit. 
I would be interested in how it turns out when done of course, if you stay with what you are planning. Get ready to go to the Dark Side...on tuning.
If you do decide to go stroker, the 180 heads will work OK, but 195s would be a better choice IMO.
I would be interested in how it turns out when done of course, if you stay with what you are planning. Get ready to go to the Dark Side...on tuning.
If you do decide to go stroker, the 180 heads will work OK, but 195s would be a better choice IMO.
Team Owner
Joined: Aug 2004
Posts: 21,543
Likes: 3,216
From: Park City Utah
Wow. My '96 Silverado has 295,XXX miles on it and still runs like new. 100k? Just barely broken in!
But a new motor could potentially be a lot more fun. I agree with the others about the stroker/more cubes. You could start with a used L31 "vortec" truck block and get your 4-bolt block, plus "free" roller lifters, and one piece rear main seal.
But a new motor could potentially be a lot more fun. I agree with the others about the stroker/more cubes. You could start with a used L31 "vortec" truck block and get your 4-bolt block, plus "free" roller lifters, and one piece rear main seal.
Melting Slicks
Joined: Jan 2005
Posts: 2,658
Likes: 4
From: Clifton Park NY
Throwing it out there. Take advantage of ebl/flash and get the $25 port mod put in. Your intakes will be limitless. No change to existing wiring. I've got a thread here and another site with tons of pics . Documented start to finish. I've run a 388 with stealth ram for the past 4 years.Plenty of ponies to have fun with
Last edited by qws; Feb 25, 2017 at 02:51 PM.
Team Owner
Joined: Oct 2004
Posts: 81,241
Likes: 3,063
From: altered state
St. Jude Donor '05
Thats far from a racer cam (or engine) but that grind actually runs good on the street. Its mild with a slight touch of rump but makes decent torque- if its that new keep your lifters in order and run it
Ramps and lift arent crazy should last just fine its the new overseas garbage cores and extreme ramp stuff that blows imo.
. For small cams I wouldnt hesitate to run an older grind
How is he coming up with 10.6 with flat tops bet its much less, 64cc will pick things up though. if you want I can pm you the name of someone with some not too used up E street Eddy heads in the C3 section not a bad deal.
keep us posted
Ramps and lift arent crazy should last just fine its the new overseas garbage cores and extreme ramp stuff that blows imo.
. For small cams I wouldnt hesitate to run an older grind
How is he coming up with 10.6 with flat tops bet its much less, 64cc will pick things up though. if you want I can pm you the name of someone with some not too used up E street Eddy heads in the C3 section not a bad deal.
keep us posted
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Safety Car
Joined: Nov 2005
Posts: 3,532
Likes: 1,185
From: Arizona - If you don’t know CFI, STOP proliferating the myths around it...
To help you on your way...
https://youtu.be/EYOFnNe4tEM
Renegade intake, edlebrock heads, 80lb injectors, headers, flow master 40s, eblflash, and a mild cam.
I did not have it floored, and i need more fueling still...
https://youtu.be/EYOFnNe4tEM
Renegade intake, edlebrock heads, 80lb injectors, headers, flow master 40s, eblflash, and a mild cam.
I did not have it floored, and i need more fueling still...
More fueling? Higher pressure or more flow? Sounds nice...Nail IT!
Drifting
Joined: Mar 2015
Posts: 1,275
Likes: 165
From: Utah
Safety Car
Joined: Nov 2005
Posts: 3,532
Likes: 1,185
From: Arizona - If you don’t know CFI, STOP proliferating the myths around it...
Drifting
Joined: Mar 2015
Posts: 1,275
Likes: 165
From: Utah
Injectors are stock from a 454, 80lb TJ11 i thinj... (I can verify in my amazon history).
pressure right now is @ 12psi
I need to bump it to 14
Team Owner
Joined: Oct 2004
Posts: 81,241
Likes: 3,063
From: altered state
St. Jude Donor '05
Tom400cfi Buccaneer and a few others really really got making a CFI run down to a tee stick around
Used to be a guy here Alcee 1 that had one ported his cfi had an old 2030 Crane Eddy heads headers 3.45 gear and a 2600 stall
Really surprised how quick that car was.
Something about the 80s era vettes idk what it is
the idle and when you lug them reminds me of a cross between a boat and a wounded cow moaning always makes me
they are tons of fun though.
Can be fun seeing what you can get out of basic stuff sometimes torque isnt expensive most times, rpm and hp is.
If you havent got an oil pump skip the HV free up a few ponies, stock volume with high pressure (pink) spring just a thought
You can get a cast steel stroker crank for peanuts these days.
Used to be a guy here Alcee 1 that had one ported his cfi had an old 2030 Crane Eddy heads headers 3.45 gear and a 2600 stall
Really surprised how quick that car was.
Something about the 80s era vettes idk what it is
the idle and when you lug them reminds me of a cross between a boat and a wounded cow moaning always makes me
they are tons of fun though. Can be fun seeing what you can get out of basic stuff sometimes torque isnt expensive most times, rpm and hp is.
If you havent got an oil pump skip the HV free up a few ponies, stock volume with high pressure (pink) spring just a thought
You can get a cast steel stroker crank for peanuts these days.
Last edited by cv67; Feb 28, 2017 at 10:46 AM.
Safety Car
Joined: Nov 2005
Posts: 3,532
Likes: 1,185
From: Arizona - If you don’t know CFI, STOP proliferating the myths around it...
Tom400cfi Buccaneer and a few others really really got making a CFI run down to a tee stick around
Used to be a guy here Alcee 1 that had one ported his cfi had an old 2030 Crane Eddy heads headers 3.45 gear and a 2600 stall
Really surprised how quick that car was.
Something about the 80s era vettes idk what it is
the idle and when you lug them reminds me of a cross between a boat and a wounded cow moaning always makes me they are tons of fun though.
Can be fun seeing what you can get out of basic stuff sometimes torque isnt expensive most times, rpm and hp is.
If you havent got an oil pump skip the HV free up a few ponies, stock volume with high pressure (pink) spring just a thought
You can get a cast steel stroker crank for peanuts these days.
Used to be a guy here Alcee 1 that had one ported his cfi had an old 2030 Crane Eddy heads headers 3.45 gear and a 2600 stall
Really surprised how quick that car was.
Something about the 80s era vettes idk what it is
the idle and when you lug them reminds me of a cross between a boat and a wounded cow moaning always makes me
they are tons of fun though. Can be fun seeing what you can get out of basic stuff sometimes torque isnt expensive most times, rpm and hp is.
If you havent got an oil pump skip the HV free up a few ponies, stock volume with high pressure (pink) spring just a thought
You can get a cast steel stroker crank for peanuts these days.
Tom400cfi Buccaneer and a few others really really got making a CFI run down to a tee stick around
Drifting
Joined: Mar 2015
Posts: 1,275
Likes: 165
From: Utah
One thing i'll say about the change, i have to really hold back during take off or i will screech my tires.
Yesterday i hit the pedal to hard a few times, first time i left two black marks while trying to get around a bus, saw the marks in my rear view mirror, whoops!
second time, turning left i tap the peday and i get a "screeeeech", i back off quick, try again with less pedal and i get a shorter "screech" and i take off.
Lol
Both in areas with lots of traffic, and a high likelihood of getting a very expensive ticket.
I need to buy better tires... (Or do i?! )
Yesterday i hit the pedal to hard a few times, first time i left two black marks while trying to get around a bus, saw the marks in my rear view mirror, whoops!
second time, turning left i tap the peday and i get a "screeeeech", i back off quick, try again with less pedal and i get a shorter "screech" and i take off.
Lol
Both in areas with lots of traffic, and a high likelihood of getting a very expensive ticket.
I need to buy better tires... (Or do i?!
)
Last edited by Gibbles; Mar 3, 2017 at 06:52 AM.
Burning Brakes
Joined: Feb 2013
Posts: 1,173
Likes: 152
From: norway
One thing i'll say about the change, i have to really hold back during take off or i will screech my tires.
Yesterday i hit the pedal to hard a few times, first time i left two black marks while trying to get around a bus, saw the marks in my rear view mirror, whoops!
second time, turning left i tap the peday and i get a "screeeeech", i back off quick, try again with less pedal and i get a shorter "screech" and i take off.
Lol
Both in areas with lots of traffic, and a high likelihood of getting a very expensive ticket.
I need to buy better tires... (Or do i?! )
Yesterday i hit the pedal to hard a few times, first time i left two black marks while trying to get around a bus, saw the marks in my rear view mirror, whoops!
second time, turning left i tap the peday and i get a "screeeeech", i back off quick, try again with less pedal and i get a shorter "screech" and i take off.
Lol
Both in areas with lots of traffic, and a high likelihood of getting a very expensive ticket.
I need to buy better tires... (Or do i?!
)