[ponyakr]

"...Under a different part number however because of the different distributor drive gear it reappeared as the 455 SD cam."


So then, I suppose you could say the 744 grind ran OK in a fairly low comp 455 ? They had originally planned to used the 041 grind cam in the SD455. I've read that it should not be used below about 9:1 CR. So, how would that have turned out ? That brings up the question, what is the minimum CR for an 041 cam in a 455 ?

Just can't help it. I love to read this Jim Hand stuff.

http://www.dapa.org/building-a-stron...iac-camshafts/

[steverino]

Funny, when calling the "tech line" at comp for cam selection advice, I had that "cubicle" feeling after hanging up

Obviously a popular topic here, lots of good info and shared experience , including that last link to more great experience shared by Jim Hand

I also feel that it's two different worlds between HR and HFT cams, and don't see myself considering the HR route anytime soon , so am focusing on the HFT info

I am also uncertain if I'd like the Rhoades lifters (restored stock looking gto convert), but I'd really like to hear them in person if there's anyone in central/eastern MA , southern NH that is running them ? Maybe I could catch up with them at an event somewhere over the summer

On the other hand, (and seemingly supported by that last Jim Hand article linked), I may not absolutely need the variable lifters if I were to switch to an 041 style cam, since I have a manual trans and manual brakes ? (currently I have 14" vac @ idle)

So I'm also wondering if anyone uses an 041 in a 455 with standard lifters , and with 1.65 or 1.5 rockers ?

I guess at 9.4 I could use an 041 cam, but if I wasn't planning to try the Rhoades lifters, what option might I have ?

It's obvious that the Rhoades with certain cams (041 etc) are a proven performer, but what about HFT options with standard lifters ?

My current "plan B" (if dissatisfied with the xe274), was/is the crower 60243 , but I'm not sure how much of a difference I would experience or if it would be worth it

[scooter1966]

Originally Posted by steverino

Funny, when calling the "tech line" at comp for cam selection advice, I had that "cubicle" feeling after hanging up

Obviously a popular topic here, lots of good info and shared experience , including that last link to more great experience shared by Jim Hand

I also feel that it's two different worlds between HR and HFT cams, and don't see myself considering the HR route anytime soon , so am focusing on the HFT info

I am also uncertain if I'd like the Rhoades lifters (restored stock looking gto convert), but I'd really like to hear them in person if there's anyone in central/eastern MA , southern NH that is running them ? Maybe I could catch up with them at an event somewhere over the summer

On the other hand, (and seemingly supported by that last Jim Hand article linked), I may not absolutely need the variable lifters if I were to switch to an 041 style cam, since I have a manual trans and manual brakes ? (currently I have 14" vac @ idle)

So I'm also wondering if anyone uses an 041 in a 455 with standard lifters , and with 1.65 or 1.5 rockers ?

I guess at 9.4 I could use an 041 cam, but if I wasn't planning to try the Rhoades lifters, what option might I have ?

It's obvious that the Rhoades with certain cams (041 etc) are a proven performer, but what about HFT options with standard lifters ?

My current "plan B" (if dissatisfied with the xe274), was/is the crower 60243 , but I'm not sure how much of a difference I would experience or if it would be worth it

Here is my experience with the XE274 cam. Engine is a 455 40 over, 1.65 rockers, 6X heads that have been milled 20. Compression is at 9.2.The heads got the Jim Hand porting at home, but I only did the bowl work and did not touch the ports. 32 deg total timing all in at 3k. Th350, Continental "J.Hand" converter with 3.89 rear. 750 Holley on a Torker 2. 275/50/15 MT drag radials. Weight of the car is 3880 and ran a 13.04 in the 1/4 when launching at 1800. with a 1.8 60 ft. I'm sure i can get a better 60ft.

[grivera]

Originally Posted by scooter1966

Here is my experience with the XE274 cam. Engine is a 455 40 over, 1.65 rockers, 6X heads that have been milled 20. Compression is at 9.2.The heads got the Jim Hand porting at home, but I only did the bowl work and did not touch the ports. 32 deg total timing all in at 3k. Th350, Continental "J.Hand" converter with 3.89 rear. 750 Holley on a Torker 2. 275/50/15 MT drag radials. Weight of the car is 3880 and ran a 13.04 in the 1/4 when launching at 1800. with a 1.8 60 ft. I'm sure i can get a better 60ft.

Mikes455Wagon went 11.7's with the XE274 and unported 62's

[Bentwheelbob]

Here's a stump puller combo...

It's in a stroked W72 for my 1978 Y88 Trans Am The engine is built to look completely stock with correct XX block, 6X heads, stock cast iron 10003395 intake, and correct 17056263 quadrajet. Len Williams provided the stroked short block XX, and Dave at SD Performance provided his full package 6X heads, the CNC'd and polished intake, and his Stump Puller cam. Cliff provided his top line rebuild kit spec'd for the engine and it proved dead nuts on. The lifters are PRW 1.52 rollers.

Yesterday morning it landed at Kauffman Racing to get broken in and dyno'd. Everything went great with no meaningful drama other than a small water pump leak and stuck thermostat. It came to life after the second bump and I am really pleased with the numbers and lack of issues that were encountered. They recorded peak HP of 474 at 5100 rpm on the 6th pull, and peak torque of 549 at 3600 rpm on the 5th pull.

[scooter1966]

Originally Posted by Bentwheelbob

Here's a stump puller combo...

It's in a stroked W72 for my 1978 Y88 Trans Am The engine is built to look completely stock with correct XX block, 6X heads, stock cast iron 10003395 intake, and correct 17056263 quadrajet. Len Williams provided the stroked short block XX, and Dave at SD Performance provided his full package 6X heads, the CNC'd and polished intake, and his Stump Puller cam. Cliff provided his top line rebuild kit spec'd for the engine and it proved dead nuts on. The lifters are PRW 1.52 rollers.

Yesterday morning it landed at Kauffman Racing to get broken in and dyno'd. Everything went great with no meaningful drama other than a small water pump leak and stuck thermostat. It came to life after the second bump and I am really pleased with the numbers and lack of issues that were encountered. They recorded peak HP of 474 at 5100 rpm on the 6th pull, and peak torque of 549 at 3600 rpm on the 5th pull.

Not to go off subject, but why is the A/F L1 very different than the A/F L2?

[grivera]

Originally Posted by 72LuxuryLeMansLa.

You want to define "big turd" for us? According to SD Performance "In a recent dyno test this cam installed in a 464ci engine with 9.5 to 1 compression, a set of our 250-260cfm CNC ported #11 cast iron heads, CNC ported cast iron Q-jet intake and a prepped Q-jet carb made 503hp and 575+ lb/ft of torque on 91 octane."

In my world 575lb/ft and 503HP does not equate to a "big turd" but is a respectable car. WE ARE in the street section after all.

Originally Posted by Bentwheelbob

Here's a stump puller combo...

It's in a stroked W72 for my 1978 Y88 Trans Am The engine is built to look completely stock with correct XX block, 6X heads, stock cast iron 10003395 intake, and correct 17056263 quadrajet. Len Williams provided the stroked short block XX, and Dave at SD Performance provided his full package 6X heads, the CNC'd and polished intake, and his Stump Puller cam. Cliff provided his top line rebuild kit spec'd for the engine and it proved dead nuts on. The lifters are PRW 1.52 rollers.

Yesterday morning it landed at Kauffman Racing to get broken in and dyno'd. Everything went great with no meaningful drama other than a small water pump leak and stuck thermostat. It came to life after the second bump and I am really pleased with the numbers and lack of issues that were encountered. They recorded peak HP of 474 at 5100 rpm on the 6th pull, and peak torque of 549 at 3600 rpm on the 5th pull.

I'm running the same cam so I'm glad to see your results. I am curious as to why it's down on power compared to the SD test...474 hp/549 tq vs 503 hp /575 tq

[Cliff R]

Most likely just not on the same dyno. KRE's dyno tends to be a bit "conservative", but when we remove the engines from the dyno and put them in a vehicle set up to effectively use the power, they ALWAYS deliver excellent results at the track....FWIW......Cliff

[b-man]

Originally Posted by steverino

Funny, when calling the "tech line" at comp for cam selection advice, I had that "cubicle" feeling after hanging up

Obviously a popular topic here, lots of good info and shared experience , including that last link to more great experience shared by Jim Hand

I also feel that it's two different worlds between HR and HFT cams, and don't see myself considering the HR route anytime soon , so am focusing on the HFT info

I am also uncertain if I'd like the Rhoades lifters (restored stock looking gto convert), but I'd really like to hear them in person if there's anyone in central/eastern MA , southern NH that is running them ? Maybe I could catch up with them at an event somewhere over the summer

On the other hand, (and seemingly supported by that last Jim Hand article linked), I may not absolutely need the variable lifters if I were to switch to an 041 style cam, since I have a manual trans and manual brakes ? (currently I have 14" vac @ idle)

So I'm also wondering if anyone uses an 041 in a 455 with standard lifters , and with 1.65 or 1.5 rockers ?

I guess at 9.4 I could use an 041 cam, but if I wasn't planning to try the Rhoades lifters, what option might I have ?

It's obvious that the Rhoades with certain cams (041 etc) are a proven performer, but what about HFT options with standard lifters ?

My current "plan B" (if dissatisfied with the xe274), was/is the crower 60243 , but I'm not sure how much of a difference I would experience or if it would be worth it

I'd go right ahead and run the 041 with standard lifters, 1.65 rockers and 9.4:1 compression. Your car has a stick trans and manual brakes, nothing should be stopping you from using that combo in a street 455.

Originally Posted by ponyakr

"...Under a different part number however because of the different distributor drive gear it reappeared as the 455 SD cam."


So then, I suppose you could say the 744 grind ran OK in a fairly low comp 455 ? They had originally planned to used the 041 grind cam in the SD455. I've read that it should not be used below about 9:1 CR. So, how would that have turned out ? That brings up the question, what is the minimum CR for an 041 cam in a 455 ?

Just can't help it. I love to read this Jim Hand stuff.

http://www.dapa.org/building-a-stron...iac-camshafts/

I've never used the 041 cam, but I have used 2 bigger cams than the 041 in a 455 with less than 9:1 compression. Ran the H-O Racing HC-02 (231/243,.512"/516" w/1.65 rockers) and the HC-03 (244/252, .550"/.554" w/1.65s). Only ran the 02 cam for a short time before switching to the 03 cam, in a standard-bore 455 with #197 HO heads at around 8.6:1. It ran great and had low vacuum at idle as expected, manual brake car so it didn't matter.

Sure, higher compression would have been better, but in my situation I was using the parts I had on hand along with the camshaft recommendations straight out of the H-O Racing catalog. The HC-03 was recommended for the 455 HO (a known low-compression engine, right?) with lower gearing, I was using 3.89 cogs with a 28" tall tire:http://forums.maxperformanceinc.com/...5&postcount=19

[grrrrregg!!!]

I've never used the 041 cam, but I have used 2 bigger cams than the 041 in a 455 with less than 9:1 compression. Ran the H-O Racing HC-02 (231/243,.512"/516" w/1.65 rockers) and the HC-03 (244/252, .550"/.554" w/1.65s). Only ran the 02 cam for a short time before switching to the 03 cam, in a standard-bore 455 with #197 HO heads at around 8.6:1. It ran great and had low vacuum at idle as expected, manual brake car so it didn't matter.

Sure, higher compression would have been better, but in my situation I was using the parts I had on hand along with the camshaft recommendations straight out of the H-O Racing catalog. The HC-03 was recommended for the 455 HO (a known low-compression engine, right?) with lower gearing, I was using 3.89 cogs with a 28" tall tire:http://forums.maxperformanceinc.com/...5&postcount=19[/QUOTE]

b-man, would you run the HC-03 again today
I have an HC-63 cam I am holding on to for my Super Duty, I believe it spec's out the same as the HC-03, I was considering this cam for my Super Duty. Would anyone this cam today. With 1.50 rockers it seems close to the 041. Does anyone know the specs on the original SD cam for 73 that got axed.