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Which intake

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Mark Miller
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curiousgeorge
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Post  curiousgeorge October 30th 2022, 9:25 pm

I’m building a 429 with the following components.
Stock C9VE 429 with fresh rings and bearings
Heads are A429 CJ heads that have been ported and gasket matched.
Cam is a Complete 320H hyd flat tappet with .620 lift if I remember correctly I’d have to check the cam card.
Holley sniper 4150 flange EFI

I have 2 intakes to choose from, first is a 4500 flange Motorsports “Victor” intake. Has been ported and gasket matched. With a 4150 adapter.

Next is an Offy port-0-sonic that has been gasket matched.

While I don’t think either would be optimal which one would be better in a 95%street 5%strip car?

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Post  supervel45 October 30th 2022, 10:46 pm

268/268 at .050" .610"/610", if it's a Comp Cams 320H-10. That's a big HFT. I'd go with the Victor.

PS: I would check my PTV clearance if you are running stock pistons, also.

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Post  Mark Miller October 30th 2022, 11:26 pm

curiousgeorge wrote:I’m building a 429 with the following components.
Stock C9VE 429 with fresh rings and bearings
Heads are A429 CJ heads that have been ported and gasket matched.
Cam is a Complete 320H hyd flat tappet with .620 lift if I remember correctly I’d have to check the cam card.
Holley sniper 4150 flange EFI

I have 2 intakes to choose from, first is a 4500 flange Motorsports “Victor” intake. Has been ported and gasket matched. With a 4150 adapter.

Next is an Offy port-0-sonic that has been gasket matched.

While I don’t think either would be optimal which one would be better in a 95%street 5%strip car?

What are you planning on using for a transmission and rear end gearing?That cam will need a good converter stall if using an automatic?I would say the Victor for the Intake although i think the Port-o-Sonic would also work ok maybe not as good as the Victor though!!And FWIW i have a 4150 Flange Victor Intake that is gasket matched to CJ size For Sale on here!!

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Post  supervel45 October 30th 2022, 11:37 pm

That cam will test stock cast pistons and rods if he uses it's full RPM potential in a 429 also. It will sound good though. Wink

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Post  curiousgeorge October 31st 2022, 7:29 am

Yes it was the largest HFT they made at the time. I also have a 292H-10 sitting around with nothing to do. I have went back and forth on which to use.

Yes it will be backed up with a C6 and probably stay with the 3:55 gears for street use.

The MSD box should keep me from letting it get to those rpm levels 🤪. I’m thinking a 6 chip will live in it until I build a new bottom end.

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Post  dfree383 October 31st 2022, 7:54 am

Cams way to big, need to reconsider.

Without a super loose convertor and way more gearing it’s going to be a pig

With the EFI and a small inch motor, the Offy would be the better of the two, or sell both of those and get a torker 2.
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Post  rmcomprandy October 31st 2022, 10:31 am

curiousgeorge wrote:I’m building a 429 with the following components.
Stock C9VE 429 with fresh rings and bearings
Heads are A429 CJ heads that have been ported and gasket matched.
Cam is a Complete 320H hyd flat tappet with .620 lift if I remember correctly I’d have to check the cam card.
Holley sniper 4150 flange EFI

I have 2 intakes to choose from, first is a 4500 flange Motorsports “Victor” intake. Has been ported and gasket matched. With a 4150 adapter.

Next is an Offy port-0-sonic that has been gasket matched.

While I don’t think either would be optimal which one would be better in a 95%street 5%strip car?

I would first try to find a "Torquer II" and have it port matched on 4 runners ... runners 1,3 and 6,8.

YES ... that cam is to big.

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Post  supervel45 October 31st 2022, 11:58 am

curiousgeorge wrote:Yes it was the largest HFT they made at the time. I also have a 292H-10 sitting around with nothing to do. I have went back and forth on which to use.

Yes it will be backed up with a C6 and probably stay with the 3:55 gears for street use.

The MSD box should keep me from letting it get to those rpm levels 🤪. I’m thinking a 6 chip will live in it until I build a new bottom end.


It sounds like you have some parts you would like to use on hand, and get something going, until you build something better. Nothing wrong with that. The economy sucks and parts prices are through the roof. With the 3.55 gears the 292H10 and Offy would be more street friendly.
The dynamic compression between those two cams at 11.0/1 static is (292)8.16/1 and (320)7.04/1, both on a 106ICL, for what its worth. I'd still go with the 292. You would be better in the PTV clearance department with the 292 but, I would still check it. The 2.20"/2.25" in the A429's valves and the small stock diameter valve notch's cause problems on the radial edge with the big cams. If you go smaller on the cam the dynamic compression will go higher, so you are in a Catch 22 deal all around.

Since you brought up these Old School parts I will throw this one in the mix, just because. Cool

https://www.ebay.com/itm/314082128015

It's 7.85/1 dynamic on a 108ICL/108LSA and 8.16/1 on a 104ICL. 296/305 246/253 .588"/.585". If you want some more exhaust duration and a little more low end torque at for $177.50/to your door, it's out there, and might even be a U.S. core. May not be a too bad of a choice for you next bottom end also. I am tempted to buy it myself, the way parts prices are going. Twisted Evil


Last edited by supervel45 on October 31st 2022, 9:18 pm; edited 1 time in total (Reason for editing : Mis-Calulated Dynamic Compression)

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Post  curiousgeorge October 31st 2022, 5:54 pm

supervel45 wrote:
curiousgeorge wrote:Yes it was the largest HFT they made at the time. I also have a 292H-10 sitting around with nothing to do. I have went back and forth on which to use.

Yes it will be backed up with a C6 and probably stay with the 3:55 gears for street use.

The MSD box should keep me from letting it get to those rpm levels 🤪. I’m thinking a 6 chip will live in it until I build a new bottom end.


It sounds like you have some parts you would like to use on hand, and get something going, until you build something better. Nothing wrong with that. The economy sucks and parts prices are through the roof. With the 3.55 gears the 292H10 and Offy would be more street friendly.
The dynamic compression between those two cams at 11.0/1 static is (292)9.72/1 and (320)9.02/1 for what its worth. I'd still go with the 292 and run better fuel if needed. You would be better in the PTV clearance department with the 292 but, I would still check it. The 2.20"/2.25" in the A429's valves and the small stock diameter valve notch's cause problems on the radial edge with the big cams. If you go smaller on the cam the dynamic compression will go higher, so you are in a Catch 22 deal all around.

Since you brought up these Old School parts I will throw this one in the mix, just because. Cool

https://www.ebay.com/itm/314082128015

It's 9.77/1 dynamic on a 108LSA 246/253. If you want some more exhaust duration and a little more low end torque at for $177.50/to your door, it's out there, and might even be a U.S. core. May not be a too bad of a choice for you next bottom end also. I am tempted to buy it myself, the way parts prices are going. Twisted Evil

That’s exactly what I have a bunch of parts laying around and a 2006 V6 mustang. So far the only parts I’ve had to buy was an 8.8 rearend that had bad gears in it but I had the 3:55 rear laying outside. I figure if I get the 429 together for the price of gaskets rings and bearings I can get the car together and start working some bugs out of it while gathering parts for the next engine. The plan is to keep the stock V6 look and have as much of the factory options work as possible.

I have a D9 460 but it had water sit in a cylinder and it needs bored. That will be the block for the next one.

I have been researching E85 since the comp will be up there.

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Post  supervel45 October 31st 2022, 9:02 pm

http://www.wallaceracing.com/dynamic-cr.php

I used the .050" duration by mistake. The Comp. 292 is 8.16/1, you should be good. As for the PTV, I would still check it with a solid lifter to see were your at. I will edit the dynamic compression above with mentioned cams.

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Post  rmcomprandy October 31st 2022, 11:50 pm

Sometimes just using parts laying around can make-up a decent combination but, not this time.

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Post  Scott Foxwell November 1st 2022, 11:22 am

supervel45 wrote:That cam will test stock cast pistons and rods if he uses it's full RPM potential in a 429 also. It will sound good though. Wink
Back in about 1984 I had a 69 Mach1 I built a 429 for. It was 1970 "2 bolt CJ" out of a '70 Torino. Nothing really special about the engine other than it was the D0 block with the thick webs. Had the original flat top cast pistons, shoulder cut rods, stock crank, standard D0 heads, etc. I cleaned up the heads a little, cut the ridge off the back of the stock intake valves, bought a .560" 250* Isky SFT, converted the rockers to Boss 351 w/Motorsports guide plates and Isky 5/16" pushrods. Had 8005A springs with Isky retainers. LOL...I knew nothing about "proper installed height" or rocker geometry, anything like that back then. Put it together like the instructions said. Shocked  I bought the cutter and cut the guide tops with a hand drill for the old teflon "PC" seals. I had a dual quad Buddy Barr intake for it and a pair of 1850's that a guy told me how to set up. With the stock bottom end and basically stock heads it had near 11:1 c/r and I tell you what. That thing would turn 7K+ in an instant! Had a top loader and 3.89 gear. In those days I would just let it rev till the valves floated, then shift. LOL...I was the burn out king. Smile Point being, that stock bottom end took everything I could throw at it and then some. Drove it across country from CA to VA, thrashed it for over a year in VA street racing, went through a couple transmissions, ended up with a C6 behind it, yada yada...car was fast. Good combination that just worked. Drove it back to CA and beat on it for another year. Finally wrecked the car in a fluke. Engine was tired, lot of blowby, down on power, flat wore out. When I pulled it apart, the caps would just fall off the rods but that bottom end never came apart!

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Post  Lem Evans November 1st 2022, 1:36 pm

Scott Foxwell wrote:
supervel45 wrote:That cam will test stock cast pistons and rods if he uses it's full RPM potential in a 429 also. It will sound good though. Wink
Back in about 1984 I had a 69 Mach1 I built a 429 for. It was 1970 "2 bolt CJ" out of a '70 Torino. Nothing really special about the engine other than it was the D0 block with the thick webs. Had the original flat top cast pistons, shoulder cut rods, stock crank, standard D0 heads, etc. I cleaned up the heads a little, cut the ridge off the back of the stock intake valves, bought a .560" 250* Isky SFT, converted the rockers to Boss 351 w/Motorsports guide plates and Isky 5/16" pushrods. Had 8005A springs with Isky retainers. LOL...I knew nothing about "proper installed height" or rocker geometry, anything like that back then. Put it together like the instructions said. Shocked  I bought the cutter and cut the guide tops with a hand drill for the old teflon "PC" seals. I had a dual quad Buddy Barr intake for it and a pair of 1850's that a guy told me how to set up. With the stock bottom end and basically stock heads it had near 11:1 c/r and I tell you what. That thing would turn 7K+ in an instant! Had a top loader and 3.89 gear. In those days I would just let it rev till the valves floated, then shift. LOL...I was the burn out king. Smile Point being, that stock bottom end took everything I could throw at it and then some. Drove it across country from CA to VA, thrashed it for over a year in VA street racing, went through a couple transmissions, ended up with a C6 behind it, yada yada...car was fast. Good combination that just worked. Drove it back to CA and beat on it for another year. Finally wrecked the car in a fluke. Engine was tired, lot of blowby, down on power, flat wore out. When I pulled it apart, the caps would just fall off the rods but that bottom end never came apart!

It's been a long time since I thought about a 8005A Isky spring:D

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