modified 502mpi intake on 502 dyno session at my shop
11-28-2022 | 09:37 AM
#251
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From: On A Dirt Floor
Quick kind of side track:
There are cnc ported merlin heads:
Don’t know the cost or etc. Just throwing it out there. And yes, you csn send in yours in to HVH if you skready own them.
https://m.facebook.com/highvelocityheads?refid=13
There are cnc ported merlin heads:
Don’t know the cost or etc. Just throwing it out there. And yes, you csn send in yours in to HVH if you skready own them.
https://m.facebook.com/highvelocityheads?refid=13
Last edited by SB; 11-28-2022 at 09:42 AM.
11-29-2022 | 06:19 AM
#252
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From: frankenmuth michigan
Goddamn it I’ve typed this reply THREE times and keep getting logged out before I’m finished !!! WTF ???
Exhaust is TBD, but won’t be stock.
ProComp heads are completely bare castings that even the guides are out of, if the castings are good enough I could rebuild with good parts…
Merlin heads are the only cast iron heads available due to supply chain issues. I’m happy to pay for QUALITY, DOCUMENTED (flow bench tested) porting.
Cam is unused left over from my 540 69 Camaro build, but 246 @.050 doesn’t seem like a big cam for 565 CID, not in a car anyway.
I have a 502 MPI complete setup and intake spacers for the tall deck Merlin IV block, so I could do that, single plane Dominator carb or single plane EFI, whatever the best choice is.
Exhaust is TBD, but won’t be stock.
ProComp heads are completely bare castings that even the guides are out of, if the castings are good enough I could rebuild with good parts…
Merlin heads are the only cast iron heads available due to supply chain issues. I’m happy to pay for QUALITY, DOCUMENTED (flow bench tested) porting.
Cam is unused left over from my 540 69 Camaro build, but 246 @.050 doesn’t seem like a big cam for 565 CID, not in a car anyway.
I have a 502 MPI complete setup and intake spacers for the tall deck Merlin IV block, so I could do that, single plane Dominator carb or single plane EFI, whatever the best choice is.
Not saying cam is "too big" for a 565, just saying where you put water in exahust/what exhaust will determine if it has reversion or not. IE, you buy a set of lightning headers with wet tails, they would revert with that cam
As much as I love Mpi intakes and moddng them for impressive gains, I would say a 56 is just too big for the limitations of the intake, a fully modded mpi intake would be be done at 5200/5300 on a 565,
04-05-2023 | 03:16 PM
#253
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From: KCMO
Epic thread. It was my inspiration to step up and purchase a used Gen V flame arrestor for $40 off the Swap Shop some years ago. Now that the injectors are out and sent to Smitty (articfriends) for servicing, Ive decided to tackle this Gen 6 to Gen 5 flame arrestor swap. Okay, I'm a little embarrassed to get hung up on this, but how are you guys mounting this thing? Of course, you can just use all thread, but then you are holding the throttle body on with the flame arrestor - not ideal IMO. I take it the GEN 5 TB had a countersink where the oem stud went through and the GEN 6 TB does not. Any ideas?
04-05-2023 | 08:23 PM
#254
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Epic thread. It was my inspiration to step up and purchase a used Gen V flame arrestor for $40 off the Swap Shop some years ago. Now that the injectors are out and sent to Smitty (articfriends) for servicing, Ive decided to tackle this Gen 6 to Gen 5 flame arrestor swap. Okay, I'm a little embarrassed to get hung up on this, but how are you guys mounting this thing? Of course, you can just use all thread, but then you are holding the throttle body on with the flame arrestor - not ideal IMO. I take it the GEN 5 TB had a countersink where the oem stud went through and the GEN 6 TB does not. Any ideas?
04-05-2023 | 09:50 PM
#255
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From: KCMO
04-06-2023 | 06:20 AM
#256
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From: frankenmuth michigan
Epic thread. It was my inspiration to step up and purchase a used Gen V flame arrestor for $40 off the Swap Shop some years ago. Now that the injectors are out and sent to Smitty (articfriends) for servicing, Ive decided to tackle this Gen 6 to Gen 5 flame arrestor swap. Okay, I'm a little embarrassed to get hung up on this, but how are you guys mounting this thing? Of course, you can just use all thread, but then you are holding the throttle body on with the flame arrestor - not ideal IMO. I take it the GEN 5 TB had a countersink where the oem stud went through and the GEN 6 TB does not. Any ideas?
Last edited by articfriends; 04-06-2023 at 09:01 PM.
04-06-2023 | 08:04 AM
#257
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From: Hemlock, MI
After struggling with a TB on a 502 with wrong fasteners with gen V FA and the Gaffrig FA, I would spend the money on the factor GEN V fasteners, counter bore the TB where shoulders go in and be done with it. With threaded rod/ all thread, the fasteners holding FA on are also holding tb on. If it moves around at, you suffer from Vacuum leaks, binding throttle etc. We fought this on Racin Jasons PQ w a TB I bored out and made blades for, etc. He mounted it with all-thread, not the merc shouldered bolts and it constantly hung up linkage, hunted rpms etc. It did run 84 day 1 a shootout and 85 day 2 in his 280 PQ, not bad for a MPI 509, Smitty
The correct and fool-proof way would be to machine the TB to accept the right fasteners.
04-06-2023 | 09:09 PM
#258
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From: frankenmuth michigan
I used all-thread rod on my two MPI's with converted Gen5 FA's as well, I didn't use paper gaskets though and used RTV. My TB's were bored out by TPiS (that was a whole different story) and couldn't trim paper gaskets enough to leave anything meaningful remaining to seal. Had some serious issues with getting TPS voltage right on one of them, but that was more on TPiS than anything.
The correct and fool-proof way would be to machine the TB to accept the right fasteners.
The correct and fool-proof way would be to machine the TB to accept the right fasteners.
Your butchered up TB TPIS sent you back with nasty cutter mark down bore and blades that looked like they were cut on a bandsaw was a driving factor in me modding 502/454 mag tb's myself inhouse! It was fun finding more flow than the TPIS mod gives with a smaller bore after all the flow bench work too!
Last edited by articfriends; 04-07-2023 at 07:22 PM.
04-07-2023 | 08:51 AM
#259
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From: Hemlock, MI
Thats exactly what I'm saying, when I bore out throttle boys and build blades, if customers gonna run a gaffrig FA (the best of the best) or a Gen V, I counter bore the gen 6 TB for gen 5 fasteners (those 8 or 9" long double studs with shoulder in middle). Those studs are like 120, 130$ for 4, way to difficult to make though!
Your butchered up TB TPIS sent you back with nasty cutter mark down bore and blades that looked like they were cut on a bandsaw was a driving factor in me modding 502/454 mag tb's inhouse! It was fun finding more flow than the TPIS mod gives with a smaller bore after all the flow bench work too!
Your butchered up TB TPIS sent you back with nasty cutter mark down bore and blades that looked like they were cut on a bandsaw was a driving factor in me modding 502/454 mag tb's inhouse! It was fun finding more flow than the TPIS mod gives with a smaller bore after all the flow bench work too!
